/*
- * Copyright (C) 2012, 2013
+ * Copyright (C) 2012, 2013, 2014
* Dale Weiler
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* SOFTWARE.
*/
#include <string.h>
+#include <math.h>
+
#include "ast.h"
#include "parser.h"
#define FOLD_STRING_UNTRANSLATE_HTSIZE 1024
#define FOLD_STRING_DOTRANSLATE_HTSIZE 1024
+/* The options to use for inexact and arithmetic exceptions */
+#define FOLD_ROUNDING SFLOAT_ROUND_NEAREST_EVEN
+#define FOLD_TINYNESS SFLOAT_TBEFORE
+
+/*
+ * The constant folder is also responsible for validating if the constant
+ * expressions produce valid results. We cannot trust the FPU control
+ * unit for these exceptions because setting FPU control words might not
+ * work. Systems can set and enforce FPU modes of operation. It's also valid
+ * for libc's to simply ignore FPU exceptions. For instance ARM CPUs in
+ * glibc. We implement some trivial and IEE 754 conformant functions which
+ * emulate those operations. This is an entierly optional compiler feature
+ * which shouldn't be enabled for anything other than performing strict
+ * passes on constant expressions since it's quite slow.
+ */
+typedef uint32_t sfloat_t;
+
+typedef union {
+ qcfloat_t f;
+ sfloat_t s;
+} sfloat_cast_t;
+
+typedef enum {
+ SFLOAT_INVALID = 1,
+ SFLOAT_DIVBYZERO = 4,
+ SFLOAT_OVERFLOW = 8,
+ SFLOAT_UNDERFLOW = 16,
+ SFLOAT_INEXACT = 32
+} sfloat_exceptionflags_t;
+
+typedef enum {
+ SFLOAT_ROUND_NEAREST_EVEN,
+ SFLOAT_ROUND_DOWN,
+ SFLOAT_ROUND_UP,
+ SFLOAT_ROUND_TO_ZERO
+} sfloat_roundingmode_t;
+
+typedef enum {
+ SFLOAT_TAFTER,
+ SFLOAT_TBEFORE
+} sfloat_tdetect_t;
+
+typedef struct {
+ sfloat_roundingmode_t roundingmode;
+ sfloat_exceptionflags_t exceptionflags;
+ sfloat_tdetect_t tiny;
+} sfloat_state_t;
+
+/* Count of leading zero bits before the most-significand 1 bit. */
+#ifdef _MSC_VER
+/* MSVC has an intrinsic for this */
+ static GMQCC_INLINE uint32_t sfloat_clz(uint32_t x) {
+ int r = 0;
+ _BitScanForward(&r, x);
+ return r;
+ }
+# define SFLOAT_CLZ(X, SUB) \
+ (sfloat_clz((X)) - (SUB))
+#elif defined(__GNUC__) || defined(__CLANG__)
+/* Clang and GCC have a builtin for this */
+# define SFLOAT_CLZ(X, SUB) \
+ (__builtin_clz((X)) - (SUB))
+#else
+/* Native fallback */
+ static GMQCC_INLINE uint32_t sfloat_popcnt(uint32_t x) {
+ x -= ((x >> 1) & 0x55555555);
+ x = (((x >> 2) & 0x33333333) + (x & 0x33333333));
+ x = (((x >> 4) + x) & 0x0F0F0F0F);
+ x += x >> 8;
+ x += x >> 16;
+ return x & 0x0000003F;
+ }
+ static GMQCC_INLINE uint32_t sfloat_clz(uint32_t x) {
+ x |= (x >> 1);
+ x |= (x >> 2);
+ x |= (x >> 4);
+ x |= (x >> 8);
+ x |= (x >> 16);
+ return 32 - sfloat_popcnt(x);
+ }
+# define SFLOAT_CLZ(X, SUB) \
+ (sfloat_clz((X) - (SUB)))
+#endif
+
+/* The value of a NaN */
+#define SFLOAT_NAN 0xFFC00000
+/* Test if NaN */
+#define SFLOAT_ISNAN(A) \
+ (0xFF000000 < (uint32_t)((A) << 1))
+/* Test if signaling NaN */
+#define SFLOAT_ISSNAN(A) \
+ (((((A) >> 22) & 0x1FF) == 0x1FE) && ((A) & 0x003FFFFF))
+/* Raise exception */
+#define SFLOAT_RAISE(STATE, FLAGS) \
+ ((STATE)->exceptionflags |= (FLAGS))
+/*
+ * Shifts `A' right `COUNT' bits. Non-zero bits are stored in LSB. Size
+ * sets the arbitrarly-large limit.
+ */
+#define SFLOAT_SHIFT(SIZE, A, COUNT, Z) \
+ *(Z) = ((COUNT) == 0) \
+ ? 1 \
+ : (((COUNT) < (SIZE)) \
+ ? ((A) >> (COUNT)) | (((A) << ((-(COUNT)) & ((SIZE) - 1))) != 0) \
+ : ((A) != 0))
+/* Extract fractional component */
+#define SFLOAT_EXTRACT_FRAC(X) \
+ ((uint32_t)((X) & 0x007FFFFF))
+/* Extract exponent component */
+#define SFLOAT_EXTRACT_EXP(X) \
+ ((int16_t)((X) >> 23) & 0xFF)
+/* Extract sign bit */
+#define SFLOAT_EXTRACT_SIGN(X) \
+ ((X) >> 31)
+/* Normalize a subnormal */
+#define SFLOAT_SUBNORMALIZE(SA, Z, SZ) \
+ (void)(*(SZ) = (SA) << SFLOAT_CLZ((SA), 8), *(SZ) = 1 - SFLOAT_CLZ((SA), 8))
+/*
+ * Pack sign, exponent and significand and produce a float.
+ *
+ * Integer portions of the significand are added to the exponent. The
+ * exponent input should be one less than the result exponent whenever
+ * the significand is normalized since normalized significand will
+ * always have an integer portion of value one.
+ */
+#define SFLOAT_PACK(SIGN, EXP, SIG) \
+ (sfloat_t)((((uint32_t)(SIGN)) << 31) + (((uint32_t)(EXP)) << 23) + (SIG))
+
+/* Calculate NaN. If either operands are signaling then raise invalid */
+static sfloat_t sfloat_propagate_nan(sfloat_state_t *state, sfloat_t a, sfloat_t b) {
+ bool isnan_a = SFLOAT_ISNAN(a);
+ bool issnan_a = SFLOAT_ISSNAN(a);
+ bool isnan_b = SFLOAT_ISNAN(b);
+ bool issnan_b = SFLOAT_ISSNAN(b);
+
+ a |= 0x00400000;
+ b |= 0x00400000;
+
+ if (issnan_a | issnan_b)
+ SFLOAT_RAISE(state, SFLOAT_INEXACT);
+ if (issnan_a) {
+ if (issnan_b)
+ goto larger;
+ return isnan_b ? b : a;
+ } else if (isnan_a) {
+ if (issnan_b | !isnan_b)
+ return a;
+larger:
+ if ((uint32_t)(a << 1) < (uint32_t)(b << 1)) return b;
+ if ((uint32_t)(b << 1) < (uint32_t)(a << 1)) return a;
+ return (a < b) ? a : b;
+ }
+ return b;
+}
+
+/* Round and pack */
+static sfloat_t SFLOAT_PACK_round(sfloat_state_t *state, bool sign_z, int16_t exp_z, uint32_t sig_z) {
+ sfloat_roundingmode_t mode = state->roundingmode;
+ bool even = !!(mode == SFLOAT_ROUND_NEAREST_EVEN);
+ unsigned char increment = 0x40;
+ unsigned char bits = sig_z & 0x7F;
+
+ if (!even) {
+ if (mode == SFLOAT_ROUND_TO_ZERO)
+ increment = 0;
+ else {
+ increment = 0x7F;
+ if (sign_z) {
+ if (mode == SFLOAT_ROUND_UP)
+ increment = 0;
+ } else {
+ if (mode == SFLOAT_ROUND_DOWN)
+ increment = 0;
+ }
+ }
+ }
+
+ if (0xFD <= (uint16_t)exp_z) {
+ if ((0xFD < exp_z) || ((exp_z == 0xFD) && ((int32_t)(sig_z + increment) < 0))) {
+ SFLOAT_RAISE(state, SFLOAT_OVERFLOW | SFLOAT_INEXACT);
+ return SFLOAT_PACK(sign_z, 0xFF, 0) - (increment == 0);
+ }
+ if (exp_z < 0) {
+ /* Check for underflow */
+ bool tiny = (state->tiny == SFLOAT_TBEFORE) || (exp_z < -1) || (sig_z + increment < 0x80000000);
+ SFLOAT_SHIFT(32, sig_z, -exp_z, &sig_z);
+ exp_z = 0;
+ bits = sig_z & 0x7F;
+ if (tiny && bits)
+ SFLOAT_RAISE(state, SFLOAT_UNDERFLOW);
+ }
+ }
+
+ /*
+ * Significand has point between bits 30 and 29, 7 bits to the left of
+ * the usual place. This shifted significand has to be normalized
+ * or smaller, if it isn't the exponent must be zero, in which case
+ * no rounding occurs since the result will be a subnormal.
+ */
+ if (bits)
+ SFLOAT_RAISE(state, SFLOAT_INEXACT);
+ sig_z = (sig_z + increment) >> 7;
+ sig_z &= ~(((bits ^ 0x40) == 0) & even);
+ if (sig_z == 0)
+ exp_z = 0;
+ return SFLOAT_PACK(sign_z, exp_z, sig_z);
+}
+
+/* Normalized round and pack */
+static sfloat_t SFLOAT_PACK_normal(sfloat_state_t *state, bool sign_z, int16_t exp_z, uint32_t sig_z) {
+ unsigned char c = SFLOAT_CLZ(sig_z, 1);
+ return SFLOAT_PACK_round(state, sign_z, exp_z - c, sig_z << c);
+}
+
+static sfloat_t sfloat_add_impl(sfloat_state_t *state, sfloat_t a, sfloat_t b, bool sign_z) {
+ int16_t exp_a = SFLOAT_EXTRACT_EXP(a);
+ int16_t exp_b = SFLOAT_EXTRACT_EXP(b);
+ int16_t exp_z = 0;
+ int16_t exp_d = exp_a - exp_b;
+ uint32_t sig_a = SFLOAT_EXTRACT_FRAC(a) << 6;
+ uint32_t sig_b = SFLOAT_EXTRACT_FRAC(b) << 6;
+ uint32_t sig_z = 0;
+
+ if (0 < exp_d) {
+ if (exp_a == 0xFF)
+ return sig_a ? sfloat_propagate_nan(state, a, b) : a;
+ if (exp_b == 0)
+ --exp_d;
+ else
+ sig_b |= 0x20000000;
+ SFLOAT_SHIFT(32, sig_b, exp_d, &sig_b);
+ exp_z = exp_a;
+ } else if (exp_d < 0) {
+ if (exp_b == 0xFF)
+ return sig_b ? sfloat_propagate_nan(state, a, b) : SFLOAT_PACK(sign_z, 0xFF, 0);
+ if (exp_a == 0)
+ ++exp_d;
+ else
+ sig_a |= 0x20000000;
+ SFLOAT_SHIFT(32, sig_a, -exp_d, &sig_a);
+ exp_z = exp_b;
+ } else {
+ if (exp_a == 0xFF)
+ return (sig_a | sig_b) ? sfloat_propagate_nan(state, a, b) : a;
+ if (exp_a == 0)
+ return SFLOAT_PACK(sign_z, 0, (sig_a + sig_b) >> 6);
+ sig_z = 0x40000000 + sig_a + sig_b;
+ exp_z = exp_a;
+ goto end;
+ }
+ sig_a |= 0x20000000;
+ sig_z = (sig_a + sig_b) << 1;
+ --exp_z;
+ if ((int32_t)sig_z < 0) {
+ sig_z = sig_a + sig_b;
+ ++exp_z;
+ }
+end:
+ return SFLOAT_PACK_round(state, sign_z, exp_z, sig_z);
+}
+
+static sfloat_t sfloat_sub_impl(sfloat_state_t *state, sfloat_t a, sfloat_t b, bool sign_z) {
+ int16_t exp_a = SFLOAT_EXTRACT_EXP(a);
+ int16_t exp_b = SFLOAT_EXTRACT_EXP(b);
+ int16_t exp_z = 0;
+ int16_t exp_d = exp_a - exp_b;
+ uint32_t sig_a = SFLOAT_EXTRACT_FRAC(a) << 7;
+ uint32_t sig_b = SFLOAT_EXTRACT_FRAC(b) << 7;
+ uint32_t sig_z = 0;
+
+ if (0 < exp_d) goto exp_greater_a;
+ if (exp_d < 0) goto exp_greater_b;
+
+ if (exp_a == 0xFF) {
+ if (sig_a | sig_b)
+ return sfloat_propagate_nan(state, a, b);
+ SFLOAT_RAISE(state, SFLOAT_INVALID);
+ return SFLOAT_NAN;
+ }
+
+ if (exp_a == 0)
+ exp_a = exp_b = 1;
+
+ if (sig_b < sig_a) goto greater_a;
+ if (sig_a < sig_b) goto greater_b;
+
+ return SFLOAT_PACK(state->roundingmode == SFLOAT_ROUND_DOWN, 0, 0);
+
+exp_greater_b:
+ if (exp_b == 0xFF)
+ return (sig_b) ? sfloat_propagate_nan(state, a, b) : SFLOAT_PACK(sign_z ^ 1, 0xFF, 0);
+ if (exp_a == 0)
+ ++exp_d;
+ else
+ sig_a |= 0x40000000;
+ SFLOAT_SHIFT(32, sig_a, -exp_d, &sig_a);
+ sig_b |= 0x40000000;
+greater_b:
+ sig_z = sig_b - sig_a;
+ exp_z = exp_b;
+ sign_z ^= 1;
+ goto end;
+
+exp_greater_a:
+ if (exp_a == 0xFF)
+ return (sig_a) ? sfloat_propagate_nan(state, a, b) : a;
+ if (exp_b == 0)
+ --exp_d;
+ else
+ sig_b |= 0x40000000;
+ SFLOAT_SHIFT(32, sig_b, exp_d, &sig_b);
+ sig_a |= 0x40000000;
+greater_a:
+ sig_z = sig_a - sig_b;
+ exp_z = exp_a;
+
+end:
+ --exp_z;
+ return SFLOAT_PACK_normal(state, sign_z, exp_z, sig_z);
+}
+
+static GMQCC_INLINE sfloat_t sfloat_add(sfloat_state_t *state, sfloat_t a, sfloat_t b) {
+ bool sign_a = SFLOAT_EXTRACT_SIGN(a);
+ bool sign_b = SFLOAT_EXTRACT_SIGN(b);
+ return (sign_a == sign_b) ? sfloat_add_impl(state, a, b, sign_a)
+ : sfloat_sub_impl(state, a, b, sign_a);
+}
+
+static GMQCC_INLINE sfloat_t sfloat_sub(sfloat_state_t *state, sfloat_t a, sfloat_t b) {
+ bool sign_a = SFLOAT_EXTRACT_SIGN(a);
+ bool sign_b = SFLOAT_EXTRACT_SIGN(b);
+ return (sign_a == sign_b) ? sfloat_sub_impl(state, a, b, sign_a)
+ : sfloat_add_impl(state, a, b, sign_a);
+}
+
+static sfloat_t sfloat_mul(sfloat_state_t *state, sfloat_t a, sfloat_t b) {
+ int16_t exp_a = SFLOAT_EXTRACT_EXP(a);
+ int16_t exp_b = SFLOAT_EXTRACT_EXP(b);
+ int16_t exp_z = 0;
+ uint32_t sig_a = SFLOAT_EXTRACT_FRAC(a);
+ uint32_t sig_b = SFLOAT_EXTRACT_FRAC(b);
+ uint32_t sig_z = 0;
+ uint64_t sig_z64 = 0;
+ bool sign_a = SFLOAT_EXTRACT_SIGN(a);
+ bool sign_b = SFLOAT_EXTRACT_SIGN(b);
+ bool sign_z = sign_a ^ sign_b;
+
+ if (exp_a == 0xFF) {
+ if (sig_a || ((exp_b == 0xFF) && sig_b))
+ return sfloat_propagate_nan(state, a, b);
+ if ((exp_b | sig_b) == 0) {
+ SFLOAT_RAISE(state, SFLOAT_INVALID);
+ return SFLOAT_NAN;
+ }
+ return SFLOAT_PACK(sign_z, 0xFF, 0);
+ }
+ if (exp_b == 0xFF) {
+ if (sig_b)
+ return sfloat_propagate_nan(state, a, b);
+ if ((exp_a | sig_a) == 0) {
+ SFLOAT_RAISE(state, SFLOAT_INVALID);
+ return SFLOAT_NAN;
+ }
+ return SFLOAT_PACK(sign_z, 0xFF, 0);
+ }
+ if (exp_a == 0) {
+ if (sig_a == 0)
+ return SFLOAT_PACK(sign_z, 0, 0);
+ SFLOAT_SUBNORMALIZE(sig_a, &exp_a, &sig_a);
+ }
+ if (exp_b == 0) {
+ if (sig_b == 0)
+ return SFLOAT_PACK(sign_z, 0, 0);
+ SFLOAT_SUBNORMALIZE(sig_b, &exp_b, &sig_b);
+ }
+ exp_z = exp_a + exp_b - 0x7F;
+ sig_a = (sig_a | 0x00800000) << 7;
+ sig_b = (sig_b | 0x00800000) << 8;
+ SFLOAT_SHIFT(64, ((uint64_t)sig_a) * sig_b, 32, &sig_z64);
+ sig_z = sig_z64;
+ if (0 <= (int32_t)(sig_z << 1)) {
+ sig_z <<= 1;
+ --exp_z;
+ }
+ return SFLOAT_PACK_round(state, sign_z, exp_z, sig_z);
+}
+
+static sfloat_t sfloat_div(sfloat_state_t *state, sfloat_t a, sfloat_t b) {
+ int16_t exp_a = SFLOAT_EXTRACT_EXP(a);
+ int16_t exp_b = SFLOAT_EXTRACT_EXP(b);
+ int16_t exp_z = 0;
+ uint32_t sig_a = SFLOAT_EXTRACT_FRAC(a);
+ uint32_t sig_b = SFLOAT_EXTRACT_FRAC(b);
+ uint32_t sig_z = 0;
+ bool sign_a = SFLOAT_EXTRACT_SIGN(a);
+ bool sign_b = SFLOAT_EXTRACT_SIGN(b);
+ bool sign_z = sign_a ^ sign_b;
+
+ if (exp_a == 0xFF) {
+ if (sig_a)
+ return sfloat_propagate_nan(state, a, b);
+ if (exp_b == 0xFF) {
+ if (sig_b)
+ return sfloat_propagate_nan(state, a, b);
+ SFLOAT_RAISE(state, SFLOAT_INVALID);
+ return SFLOAT_NAN;
+ }
+ return SFLOAT_PACK(sign_z, 0xFF, 0);
+ }
+ if (exp_b == 0xFF)
+ return (sig_b) ? sfloat_propagate_nan(state, a, b) : SFLOAT_PACK(sign_z, 0, 0);
+ if (exp_b == 0) {
+ if (sig_b == 0) {
+ if ((exp_a | sig_a) == 0) {
+ SFLOAT_RAISE(state, SFLOAT_INVALID);
+ return SFLOAT_NAN;
+ }
+ SFLOAT_RAISE(state, SFLOAT_DIVBYZERO);
+ return SFLOAT_PACK(sign_z, 0xFF, 0);
+ }
+ SFLOAT_SUBNORMALIZE(sig_b, &exp_b, &sig_b);
+ }
+ if (exp_a == 0) {
+ if (sig_a == 0)
+ return SFLOAT_PACK(sign_z, 0, 0);
+ SFLOAT_SUBNORMALIZE(sig_a, &exp_a, &sig_a);
+ }
+ exp_z = exp_a - exp_b + 0x7D;
+ sig_a = (sig_a | 0x00800000) << 7;
+ sig_b = (sig_b | 0x00800000) << 8;
+ if (sig_b <= (sig_a + sig_a)) {
+ sig_a >>= 1;
+ ++exp_z;
+ }
+ sig_z = (((uint64_t)sig_a) << 32) / sig_b;
+ if ((sig_z & 0x3F) == 0)
+ sig_z |= ((uint64_t)sig_b * sig_z != ((uint64_t)sig_a) << 32);
+ return SFLOAT_PACK_round(state, sign_z, exp_z, sig_z);
+}
+
+static GMQCC_INLINE void sfloat_check(lex_ctx_t ctx, sfloat_state_t *state, const char *vec) {
+ /* Exception comes from vector component */
+ if (vec) {
+ if (state->exceptionflags & SFLOAT_DIVBYZERO)
+ compile_error(ctx, "division by zero in `%s' component", vec);
+ if (state->exceptionflags & SFLOAT_INVALID)
+ compile_error(ctx, "undefined (inf) in `%s' component", vec);
+ if (state->exceptionflags & SFLOAT_OVERFLOW)
+ compile_error(ctx, "arithmetic overflow in `%s' component", vec);
+ if (state->exceptionflags & SFLOAT_UNDERFLOW)
+ compile_error(ctx, "arithmetic underflow in `%s' component", vec);
+ return;
+ }
+ if (state->exceptionflags & SFLOAT_DIVBYZERO)
+ compile_error(ctx, "division by zero");
+ if (state->exceptionflags & SFLOAT_INVALID)
+ compile_error(ctx, "undefined (inf)");
+ if (state->exceptionflags & SFLOAT_OVERFLOW)
+ compile_error(ctx, "arithmetic overflow");
+ if (state->exceptionflags & SFLOAT_UNDERFLOW)
+ compile_error(ctx, "arithmetic underflow");
+}
+
+static GMQCC_INLINE void sfloat_init(sfloat_state_t *state) {
+ state->exceptionflags = 0;
+ state->roundingmode = FOLD_ROUNDING;
+ state->tiny = FOLD_TINYNESS;
+}
+
/*
* There is two stages to constant folding in GMQCC: there is the parse
* stage constant folding, where, witht he help of the AST, operator
* usages can be constant folded. Then there is the constant folding
* in the IR for things like eliding if statements, can occur.
- *
+ *
* This file is thus, split into two parts.
*/
-ast_expression **fold_const_values = NULL;
-
-static GMQCC_INLINE bool fold_possible(const ast_value *val) {
- return ast_istype((ast_expression*)val, ast_value) &&
- val->hasvalue && (val->cvq == CV_CONST) &&
- ((ast_expression*)val)->vtype != TYPE_FUNCTION; /* why not for functions? */
-}
-#define isfloat(X) (((ast_expression*)(X))->vtype == TYPE_FLOAT && fold_possible(X))
-#define isvector(X) (((ast_expression*)(X))->vtype == TYPE_VECTOR && fold_possible(X))
-#define isstring(S) (((ast_expression*)(X))->vtype == TYPE_STRING && fold_possible(X))
-#define isfloats(X,Y) (isfloat (X) && isfloat(Y))
-#define isvectors(X,Y) (isvector(X) && isvector(Y))
-#define isstrings(X,Y) (isstring(X) && isstring(Y))
+#define isfloat(X) (((ast_expression*)(X))->vtype == TYPE_FLOAT)
+#define isvector(X) (((ast_expression*)(X))->vtype == TYPE_VECTOR)
+#define isstring(X) (((ast_expression*)(X))->vtype == TYPE_STRING)
+#define isfloats(X,Y) (isfloat (X) && isfloat (Y))
/*
* Implementation of basic vector math for vec3_t, for trivial constant
* folding.
- *
+ *
* TODO: gcc/clang hinting for autovectorization
*/
-static GMQCC_INLINE vec3_t vec3_add(vec3_t a, vec3_t b) {
- vec3_t out;
- out.x = a.x + b.x;
- out.y = a.y + b.y;
- out.z = a.z + b.z;
- return out;
+typedef enum {
+ VEC_COMP_X = 1 << 0,
+ VEC_COMP_Y = 1 << 1,
+ VEC_COMP_Z = 1 << 2
+} vec3_comp_t;
+
+typedef struct {
+ sfloat_cast_t x;
+ sfloat_cast_t y;
+ sfloat_cast_t z;
+} vec3_soft_t;
+
+typedef struct {
+ vec3_comp_t faults;
+ sfloat_state_t state[3];
+} vec3_soft_state_t;
+
+static GMQCC_INLINE vec3_soft_t vec3_soft_convert(vec3_t vec) {
+ vec3_soft_t soft;
+ soft.x.f = vec.x;
+ soft.y.f = vec.y;
+ soft.z.f = vec.z;
+ return soft;
+}
+
+static GMQCC_INLINE bool vec3_soft_exception(vec3_soft_state_t *vstate, size_t index) {
+ sfloat_exceptionflags_t flags = vstate->state[index].exceptionflags;
+ if (flags & SFLOAT_DIVBYZERO) return true;
+ if (flags & SFLOAT_INVALID) return true;
+ if (flags & SFLOAT_OVERFLOW) return true;
+ if (flags & SFLOAT_UNDERFLOW) return true;
+ return false;
+}
+
+static GMQCC_INLINE void vec3_soft_eval(vec3_soft_state_t *state,
+ sfloat_t (*callback)(sfloat_state_t *, sfloat_t, sfloat_t),
+ vec3_t a,
+ vec3_t b)
+{
+ vec3_soft_t sa = vec3_soft_convert(a);
+ vec3_soft_t sb = vec3_soft_convert(b);
+ callback(&state->state[0], sa.x.s, sb.x.s);
+ if (vec3_soft_exception(state, 0)) state->faults |= VEC_COMP_X;
+ callback(&state->state[1], sa.y.s, sb.y.s);
+ if (vec3_soft_exception(state, 1)) state->faults |= VEC_COMP_Y;
+ callback(&state->state[2], sa.z.s, sb.z.s);
+ if (vec3_soft_exception(state, 2)) state->faults |= VEC_COMP_Z;
+}
+
+static GMQCC_INLINE void vec3_check_except(vec3_t a,
+ vec3_t b,
+ lex_ctx_t ctx,
+ sfloat_t (*callback)(sfloat_state_t *, sfloat_t, sfloat_t))
+{
+ vec3_soft_state_t state;
+
+ if (!OPTS_FLAG(ARITHMETIC_EXCEPTIONS))
+ return;
+
+ sfloat_init(&state.state[0]);
+ sfloat_init(&state.state[1]);
+ sfloat_init(&state.state[2]);
+
+ vec3_soft_eval(&state, callback, a, b);
+ if (state.faults & VEC_COMP_X) sfloat_check(ctx, &state.state[0], "x");
+ if (state.faults & VEC_COMP_Y) sfloat_check(ctx, &state.state[1], "y");
+ if (state.faults & VEC_COMP_Z) sfloat_check(ctx, &state.state[2], "z");
}
-static GMQCC_INLINE vec3_t vec3_sub(vec3_t a, vec3_t b) {
+static GMQCC_INLINE vec3_t vec3_add(lex_ctx_t ctx, vec3_t a, vec3_t b) {
vec3_t out;
+ vec3_check_except(a, b, ctx, &sfloat_add);
out.x = a.x + b.x;
out.y = a.y + b.y;
out.z = a.z + b.z;
return out;
}
-static GMQCC_INLINE vec3_t vec3_not(vec3_t a) {
+static GMQCC_INLINE vec3_t vec3_sub(lex_ctx_t ctx, vec3_t a, vec3_t b) {
vec3_t out;
- out.x = !a.x;
- out.y = !a.y;
- out.z = !a.z;
+ vec3_check_except(a, b, ctx, &sfloat_sub);
+ out.x = a.x - b.x;
+ out.y = a.y - b.y;
+ out.z = a.z - b.z;
return out;
}
return out;
}
+static GMQCC_INLINE vec3_t vec3_or(vec3_t a, vec3_t b) {
+ vec3_t out;
+ out.x = (qcfloat_t)(((qcint_t)a.x) | ((qcint_t)b.x));
+ out.y = (qcfloat_t)(((qcint_t)a.y) | ((qcint_t)b.y));
+ out.z = (qcfloat_t)(((qcint_t)a.z) | ((qcint_t)b.z));
+ return out;
+}
+
+static GMQCC_INLINE vec3_t vec3_orvf(vec3_t a, qcfloat_t b) {
+ vec3_t out;
+ out.x = (qcfloat_t)(((qcint_t)a.x) | ((qcint_t)b));
+ out.y = (qcfloat_t)(((qcint_t)a.y) | ((qcint_t)b));
+ out.z = (qcfloat_t)(((qcint_t)a.z) | ((qcint_t)b));
+ return out;
+}
+
+static GMQCC_INLINE vec3_t vec3_and(vec3_t a, vec3_t b) {
+ vec3_t out;
+ out.x = (qcfloat_t)(((qcint_t)a.x) & ((qcint_t)b.x));
+ out.y = (qcfloat_t)(((qcint_t)a.y) & ((qcint_t)b.y));
+ out.z = (qcfloat_t)(((qcint_t)a.z) & ((qcint_t)b.z));
+ return out;
+}
+
+static GMQCC_INLINE vec3_t vec3_andvf(vec3_t a, qcfloat_t b) {
+ vec3_t out;
+ out.x = (qcfloat_t)(((qcint_t)a.x) & ((qcint_t)b));
+ out.y = (qcfloat_t)(((qcint_t)a.y) & ((qcint_t)b));
+ out.z = (qcfloat_t)(((qcint_t)a.z) & ((qcint_t)b));
+ return out;
+}
+
static GMQCC_INLINE vec3_t vec3_xor(vec3_t a, vec3_t b) {
vec3_t out;
- out.x = (qcfloat_t)((qcint_t)a.x ^ (qcint_t)b.x);
- out.y = (qcfloat_t)((qcint_t)a.y ^ (qcint_t)b.y);
- out.z = (qcfloat_t)((qcint_t)a.z ^ (qcint_t)b.z);
+ out.x = (qcfloat_t)(((qcint_t)a.x) ^ ((qcint_t)b.x));
+ out.y = (qcfloat_t)(((qcint_t)a.y) ^ ((qcint_t)b.y));
+ out.z = (qcfloat_t)(((qcint_t)a.z) ^ ((qcint_t)b.z));
return out;
}
static GMQCC_INLINE vec3_t vec3_xorvf(vec3_t a, qcfloat_t b) {
vec3_t out;
- out.x = (qcfloat_t)((qcint_t)a.x ^ (qcint_t)b);
- out.y = (qcfloat_t)((qcint_t)a.y ^ (qcint_t)b);
- out.z = (qcfloat_t)((qcint_t)a.z ^ (qcint_t)b);
+ out.x = (qcfloat_t)(((qcint_t)a.x) ^ ((qcint_t)b));
+ out.y = (qcfloat_t)(((qcint_t)a.y) ^ ((qcint_t)b));
+ out.z = (qcfloat_t)(((qcint_t)a.z) ^ ((qcint_t)b));
+ return out;
+}
+
+static GMQCC_INLINE vec3_t vec3_not(vec3_t a) {
+ vec3_t out;
+ out.x = -1-a.x;
+ out.y = -1-a.y;
+ out.z = -1-a.z;
return out;
}
-#if 0
-static GMQCC_INLINE qcfloat_t vec3_mulvv(vec3_t a, vec3_t b) {
+static GMQCC_INLINE qcfloat_t vec3_mulvv(lex_ctx_t ctx, vec3_t a, vec3_t b) {
+ vec3_soft_t sa;
+ vec3_soft_t sb;
+ sfloat_state_t s[5];
+ sfloat_t r[5];
+
+ if (!OPTS_FLAG(ARITHMETIC_EXCEPTIONS))
+ goto end;
+
+ sa = vec3_soft_convert(a);
+ sb = vec3_soft_convert(b);
+
+ sfloat_init(&s[0]);
+ sfloat_init(&s[1]);
+ sfloat_init(&s[2]);
+ sfloat_init(&s[3]);
+ sfloat_init(&s[4]);
+
+ r[0] = sfloat_mul(&s[0], sa.x.s, sb.x.s);
+ r[1] = sfloat_mul(&s[1], sa.y.s, sb.y.s);
+ r[2] = sfloat_mul(&s[2], sa.z.s, sb.z.s);
+ r[3] = sfloat_add(&s[3], r[0], r[1]);
+ r[4] = sfloat_add(&s[4], r[3], r[2]);
+
+ sfloat_check(ctx, &s[0], NULL);
+ sfloat_check(ctx, &s[1], NULL);
+ sfloat_check(ctx, &s[2], NULL);
+ sfloat_check(ctx, &s[3], NULL);
+ sfloat_check(ctx, &s[4], NULL);
+
+end:
return (a.x * b.x + a.y * b.y + a.z * b.z);
}
-#endif
-static GMQCC_INLINE vec3_t vec3_mulvf(vec3_t a, qcfloat_t b) {
- vec3_t out;
+static GMQCC_INLINE vec3_t vec3_mulvf(lex_ctx_t ctx, vec3_t a, qcfloat_t b) {
+ vec3_t out;
+ vec3_soft_t sa;
+ sfloat_cast_t sb;
+ sfloat_state_t s[3];
+
+ if (!OPTS_FLAG(ARITHMETIC_EXCEPTIONS))
+ goto end;
+
+ sa = vec3_soft_convert(a);
+ sb.f = b;
+ sfloat_init(&s[0]);
+ sfloat_init(&s[1]);
+ sfloat_init(&s[2]);
+
+ sfloat_mul(&s[0], sa.x.s, sb.s);
+ sfloat_mul(&s[1], sa.y.s, sb.s);
+ sfloat_mul(&s[2], sa.z.s, sb.s);
+
+ sfloat_check(ctx, &s[0], "x");
+ sfloat_check(ctx, &s[1], "y");
+ sfloat_check(ctx, &s[2], "z");
+
+end:
out.x = a.x * b;
out.y = a.y * b;
out.z = a.z * b;
return out;
}
+static GMQCC_INLINE qcfloat_t vec3_notf(vec3_t a) {
+ return (!a.x && !a.y && !a.z);
+}
+
+static GMQCC_INLINE bool vec3_pbool(vec3_t a) {
+ return (a.x || a.y || a.z);
+}
+
+static GMQCC_INLINE vec3_t vec3_cross(lex_ctx_t ctx, vec3_t a, vec3_t b) {
+ vec3_t out;
+ vec3_soft_t sa;
+ vec3_soft_t sb;
+ sfloat_t r[9];
+ sfloat_state_t s[9];
+
+ if (!OPTS_FLAG(ARITHMETIC_EXCEPTIONS))
+ goto end;
+
+ sa = vec3_soft_convert(a);
+ sb = vec3_soft_convert(b);
-static GMQCC_INLINE float fold_immvalue_float(ast_value *expr) {
- return expr->constval.vfloat;
+ sfloat_init(&s[0]);
+ sfloat_init(&s[1]);
+ sfloat_init(&s[2]);
+ sfloat_init(&s[3]);
+ sfloat_init(&s[4]);
+ sfloat_init(&s[5]);
+ sfloat_init(&s[6]);
+ sfloat_init(&s[7]);
+ sfloat_init(&s[8]);
+
+ r[0] = sfloat_mul(&s[0], sa.y.s, sb.z.s);
+ r[1] = sfloat_mul(&s[1], sa.z.s, sb.y.s);
+ r[2] = sfloat_mul(&s[2], sa.z.s, sb.x.s);
+ r[3] = sfloat_mul(&s[3], sa.x.s, sb.z.s);
+ r[4] = sfloat_mul(&s[4], sa.x.s, sb.y.s);
+ r[5] = sfloat_mul(&s[5], sa.y.s, sb.x.s);
+ r[6] = sfloat_sub(&s[6], r[0], r[1]);
+ r[7] = sfloat_sub(&s[7], r[2], r[3]);
+ r[8] = sfloat_sub(&s[8], r[4], r[5]);
+
+ sfloat_check(ctx, &s[0], NULL);
+ sfloat_check(ctx, &s[1], NULL);
+ sfloat_check(ctx, &s[2], NULL);
+ sfloat_check(ctx, &s[3], NULL);
+ sfloat_check(ctx, &s[4], NULL);
+ sfloat_check(ctx, &s[5], NULL);
+ sfloat_check(ctx, &s[6], "x");
+ sfloat_check(ctx, &s[7], "y");
+ sfloat_check(ctx, &s[8], "z");
+
+end:
+ out.x = a.y * b.z - a.z * b.y;
+ out.y = a.z * b.x - a.x * b.z;
+ out.z = a.x * b.y - a.y * b.x;
+ return out;
}
-static GMQCC_INLINE vec3_t fold_immvalue_vector(ast_value *expr) {
- return expr->constval.vvec;
+
+static lex_ctx_t fold_ctx(fold_t *fold) {
+ lex_ctx_t ctx;
+ if (fold->parser->lex)
+ return parser_ctx(fold->parser);
+
+ memset(&ctx, 0, sizeof(ctx));
+ return ctx;
}
-#if 0
-static GMQCC_INLINE const char *fold_immvalue_string(ast_value *expr) {
- return expr->constval.vstring;
+
+static GMQCC_INLINE bool fold_immediate_true(fold_t *fold, ast_value *v) {
+ switch (v->expression.vtype) {
+ case TYPE_FLOAT:
+ return !!v->constval.vfloat;
+ case TYPE_INTEGER:
+ return !!v->constval.vint;
+ case TYPE_VECTOR:
+ if (OPTS_FLAG(CORRECT_LOGIC))
+ return vec3_pbool(v->constval.vvec);
+ return !!(v->constval.vvec.x);
+ case TYPE_STRING:
+ if (!v->constval.vstring)
+ return false;
+ if (OPTS_FLAG(TRUE_EMPTY_STRINGS))
+ return true;
+ return !!v->constval.vstring[0];
+ default:
+ compile_error(fold_ctx(fold), "internal error: fold_immediate_true on invalid type");
+ break;
+ }
+ return !!v->constval.vfunc;
}
-#endif
+/* Handy macros to determine if an ast_value can be constant folded. */
+#define fold_can_1(X) \
+ (ast_istype(((ast_expression*)(X)), ast_value) && (X)->hasvalue && ((X)->cvq == CV_CONST) && \
+ ((ast_expression*)(X))->vtype != TYPE_FUNCTION)
+
+#define fold_can_2(X, Y) (fold_can_1(X) && fold_can_1(Y))
+
+#define fold_immvalue_float(E) ((E)->constval.vfloat)
+#define fold_immvalue_vector(E) ((E)->constval.vvec)
+#define fold_immvalue_string(E) ((E)->constval.vstring)
fold_t *fold_init(parser_t *parser) {
fold_t *fold = (fold_t*)mem_a(sizeof(fold_t));
* prime the tables with common constant values at constant
* locations.
*/
- (void)fold_constgen_float (fold, 0.0f);
- (void)fold_constgen_float (fold, 1.0f);
- (void)fold_constgen_float (fold, -1.0f);
+ (void)fold_constgen_float (fold, 0.0f, false);
+ (void)fold_constgen_float (fold, 1.0f, false);
+ (void)fold_constgen_float (fold, -1.0f, false);
+ (void)fold_constgen_float (fold, 2.0f, false);
(void)fold_constgen_vector(fold, vec3_create(0.0f, 0.0f, 0.0f));
+ (void)fold_constgen_vector(fold, vec3_create(-1.0f, -1.0f, -1.0f));
return fold;
}
mem_d(fold);
}
-static lex_ctx_t fold_ctx(fold_t *fold) {
- lex_ctx_t ctx;
- if (fold->parser->lex)
- return parser_ctx(fold->parser);
-
- memset(&ctx, 0, sizeof(ctx));
- return ctx;
-}
-
-ast_expression *fold_constgen_float(fold_t *fold, qcfloat_t value) {
+ast_expression *fold_constgen_float(fold_t *fold, qcfloat_t value, bool inexact) {
ast_value *out = NULL;
size_t i;
for (i = 0; i < vec_size(fold->imm_float); i++) {
- if (fold->imm_float[i]->constval.vfloat == value)
+ if (!memcmp(&fold->imm_float[i]->constval.vfloat, &value, sizeof(qcfloat_t)))
return (ast_expression*)fold->imm_float[i];
}
out = ast_value_new(fold_ctx(fold), "#IMMEDIATE", TYPE_FLOAT);
out->cvq = CV_CONST;
out->hasvalue = true;
+ out->inexact = inexact;
out->constval.vfloat = value;
vec_push(fold->imm_float, out);
return (ast_expression*)out;
}
+
+static GMQCC_INLINE ast_expression *fold_op_mul_vec(fold_t *fold, vec3_t vec, ast_value *sel, const char *set) {
+ /*
+ * vector-component constant folding works by matching the component sets
+ * to eliminate expensive operations on whole-vectors (3 components at runtime).
+ * to achive this effect in a clean manner this function generalizes the
+ * values through the use of a set paramater, which is used as an indexing method
+ * for creating the elided ast binary expression.
+ *
+ * Consider 'n 0 0' where y, and z need to be tested for 0, and x is
+ * used as the value in a binary operation generating an INSTR_MUL instruction,
+ * to acomplish the indexing of the correct component value we use set[0], set[1], set[2]
+ * as x, y, z, where the values of those operations return 'x', 'y', 'z'. Because
+ * of how ASCII works we can easily deliniate:
+ * vec.z is the same as set[2]-'x' for when set[2] is 'z', 'z'-'x' results in a
+ * literal value of 2, using this 2, we know that taking the address of vec->x (float)
+ * and indxing it with this literal will yeild the immediate address of that component
+ *
+ * Of course more work needs to be done to generate the correct index for the ast_member_new
+ * call, which is no problem: set[0]-'x' suffices that job.
+ */
+ qcfloat_t x = (&vec.x)[set[0]-'x'];
+ qcfloat_t y = (&vec.x)[set[1]-'x'];
+ qcfloat_t z = (&vec.x)[set[2]-'x'];
+
+ if (!y && !z) {
+ ast_expression *out;
+ ++opts_optimizationcount[OPTIM_VECTOR_COMPONENTS];
+ out = (ast_expression*)ast_member_new(fold_ctx(fold), (ast_expression*)sel, set[0]-'x', NULL);
+ out->node.keep = false;
+ ((ast_member*)out)->rvalue = true;
+ if (x != -1.0f)
+ return (ast_expression*)ast_binary_new(fold_ctx(fold), INSTR_MUL_F, fold_constgen_float(fold, x, false), out);
+ }
+ return NULL;
+}
+
+
+static GMQCC_INLINE ast_expression *fold_op_neg(fold_t *fold, ast_value *a) {
+ if (isfloat(a)) {
+ if (fold_can_1(a))
+ return fold_constgen_float(fold, -fold_immvalue_float(a), false);
+ } else if (isvector(a)) {
+ if (fold_can_1(a))
+ return fold_constgen_vector(fold, vec3_neg(fold_immvalue_vector(a)));
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_not(fold_t *fold, ast_value *a) {
+ if (isfloat(a)) {
+ if (fold_can_1(a))
+ return fold_constgen_float(fold, !fold_immvalue_float(a), false);
+ } else if (isvector(a)) {
+ if (fold_can_1(a))
+ return fold_constgen_float(fold, vec3_notf(fold_immvalue_vector(a)), false);
+ } else if (isstring(a)) {
+ if (fold_can_1(a)) {
+ if (OPTS_FLAG(TRUE_EMPTY_STRINGS))
+ return fold_constgen_float(fold, !fold_immvalue_string(a), false);
+ else
+ return fold_constgen_float(fold, !fold_immvalue_string(a) || !*fold_immvalue_string(a), false);
+ }
+ }
+ return NULL;
+}
+
+static bool fold_check_except_float(sfloat_t (*callback)(sfloat_state_t *, sfloat_t, sfloat_t),
+ fold_t *fold,
+ ast_value *a,
+ ast_value *b)
+{
+ sfloat_state_t s;
+ sfloat_cast_t ca;
+ sfloat_cast_t cb;
+
+ if (!OPTS_FLAG(ARITHMETIC_EXCEPTIONS) && !OPTS_WARN(WARN_INEXACT_COMPARES))
+ return false;
+
+ sfloat_init(&s);
+ ca.f = fold_immvalue_float(a);
+ cb.f = fold_immvalue_float(b);
+
+ callback(&s, ca.s, cb.s);
+ if (s.exceptionflags == 0)
+ return false;
+
+ if (!OPTS_FLAG(ARITHMETIC_EXCEPTIONS))
+ goto inexact_possible;
+
+ sfloat_check(fold_ctx(fold), &s, NULL);
+
+inexact_possible:
+ return s.exceptionflags & SFLOAT_INEXACT;
+}
+
+static bool fold_check_inexact_float(fold_t *fold, ast_value *a, ast_value *b) {
+ lex_ctx_t ctx = fold_ctx(fold);
+ if (!OPTS_WARN(WARN_INEXACT_COMPARES))
+ return false;
+ if (!a->inexact && !b->inexact)
+ return false;
+ return compile_warning(ctx, WARN_INEXACT_COMPARES, "inexact value in comparison");
+}
+
+static GMQCC_INLINE ast_expression *fold_op_add(fold_t *fold, ast_value *a, ast_value *b) {
+ if (isfloat(a)) {
+ if (fold_can_2(a, b)) {
+ bool inexact = fold_check_except_float(&sfloat_add, fold, a, b);
+ return fold_constgen_float(fold, fold_immvalue_float(a) + fold_immvalue_float(b), inexact);
+ }
+ } else if (isvector(a)) {
+ if (fold_can_2(a, b))
+ return fold_constgen_vector(fold, vec3_add(fold_ctx(fold),
+ fold_immvalue_vector(a),
+ fold_immvalue_vector(b)));
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_sub(fold_t *fold, ast_value *a, ast_value *b) {
+ if (isfloat(a)) {
+ if (fold_can_2(a, b)) {
+ bool inexact = fold_check_except_float(&sfloat_sub, fold, a, b);
+ return fold_constgen_float(fold, fold_immvalue_float(a) - fold_immvalue_float(b), inexact);
+ }
+ } else if (isvector(a)) {
+ if (fold_can_2(a, b))
+ return fold_constgen_vector(fold, vec3_sub(fold_ctx(fold),
+ fold_immvalue_vector(a),
+ fold_immvalue_vector(b)));
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_mul(fold_t *fold, ast_value *a, ast_value *b) {
+ if (isfloat(a)) {
+ if (isvector(b)) {
+ if (fold_can_2(a, b))
+ return fold_constgen_vector(fold, vec3_mulvf(fold_ctx(fold), fold_immvalue_vector(b), fold_immvalue_float(a)));
+ } else {
+ if (fold_can_2(a, b)) {
+ bool inexact = fold_check_except_float(&sfloat_mul, fold, a, b);
+ return fold_constgen_float(fold, fold_immvalue_float(a) * fold_immvalue_float(b), inexact);
+ }
+ }
+ } else if (isvector(a)) {
+ if (isfloat(b)) {
+ if (fold_can_2(a, b))
+ return fold_constgen_vector(fold, vec3_mulvf(fold_ctx(fold), fold_immvalue_vector(a), fold_immvalue_float(b)));
+ } else {
+ if (fold_can_2(a, b)) {
+ return fold_constgen_float(fold, vec3_mulvv(fold_ctx(fold), fold_immvalue_vector(a), fold_immvalue_vector(b)), false);
+ } else if (OPTS_OPTIMIZATION(OPTIM_VECTOR_COMPONENTS) && fold_can_1(a)) {
+ ast_expression *out;
+ if ((out = fold_op_mul_vec(fold, fold_immvalue_vector(a), b, "xyz"))) return out;
+ if ((out = fold_op_mul_vec(fold, fold_immvalue_vector(a), b, "yxz"))) return out;
+ if ((out = fold_op_mul_vec(fold, fold_immvalue_vector(a), b, "zxy"))) return out;
+ } else if (OPTS_OPTIMIZATION(OPTIM_VECTOR_COMPONENTS) && fold_can_1(b)) {
+ ast_expression *out;
+ if ((out = fold_op_mul_vec(fold, fold_immvalue_vector(b), a, "xyz"))) return out;
+ if ((out = fold_op_mul_vec(fold, fold_immvalue_vector(b), a, "yxz"))) return out;
+ if ((out = fold_op_mul_vec(fold, fold_immvalue_vector(b), a, "zxy"))) return out;
+ }
+ }
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_div(fold_t *fold, ast_value *a, ast_value *b) {
+ if (isfloat(a)) {
+ if (fold_can_2(a, b)) {
+ bool inexact = fold_check_except_float(&sfloat_div, fold, a, b);
+ return fold_constgen_float(fold, fold_immvalue_float(a) / fold_immvalue_float(b), inexact);
+ } else if (fold_can_1(b)) {
+ return (ast_expression*)ast_binary_new(
+ fold_ctx(fold),
+ INSTR_MUL_F,
+ (ast_expression*)a,
+ fold_constgen_float(fold, 1.0f / fold_immvalue_float(b), false)
+ );
+ }
+ } else if (isvector(a)) {
+ if (fold_can_2(a, b)) {
+ return fold_constgen_vector(fold, vec3_mulvf(fold_ctx(fold), fold_immvalue_vector(a), 1.0f / fold_immvalue_float(b)));
+ } else {
+ return (ast_expression*)ast_binary_new(
+ fold_ctx(fold),
+ INSTR_MUL_VF,
+ (ast_expression*)a,
+ (fold_can_1(b))
+ ? (ast_expression*)fold_constgen_float(fold, 1.0f / fold_immvalue_float(b), false)
+ : (ast_expression*)ast_binary_new(
+ fold_ctx(fold),
+ INSTR_DIV_F,
+ (ast_expression*)fold->imm_float[1],
+ (ast_expression*)b
+ )
+ );
+ }
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_mod(fold_t *fold, ast_value *a, ast_value *b) {
+ return (fold_can_2(a, b))
+ ? fold_constgen_float(fold, fmod(fold_immvalue_float(a), fold_immvalue_float(b)), false)
+ : NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_bor(fold_t *fold, ast_value *a, ast_value *b) {
+ if (isfloat(a)) {
+ if (fold_can_2(a, b))
+ return fold_constgen_float(fold, (qcfloat_t)(((qcint_t)fold_immvalue_float(a)) | ((qcint_t)fold_immvalue_float(b))), false);
+ } else {
+ if (isvector(b)) {
+ if (fold_can_2(a, b))
+ return fold_constgen_vector(fold, vec3_or(fold_immvalue_vector(a), fold_immvalue_vector(b)));
+ } else {
+ if (fold_can_2(a, b))
+ return fold_constgen_vector(fold, vec3_orvf(fold_immvalue_vector(a), fold_immvalue_float(b)));
+ }
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_band(fold_t *fold, ast_value *a, ast_value *b) {
+ if (isfloat(a)) {
+ if (fold_can_2(a, b))
+ return fold_constgen_float(fold, (qcfloat_t)(((qcint_t)fold_immvalue_float(a)) & ((qcint_t)fold_immvalue_float(b))), false);
+ } else {
+ if (isvector(b)) {
+ if (fold_can_2(a, b))
+ return fold_constgen_vector(fold, vec3_and(fold_immvalue_vector(a), fold_immvalue_vector(b)));
+ } else {
+ if (fold_can_2(a, b))
+ return fold_constgen_vector(fold, vec3_andvf(fold_immvalue_vector(a), fold_immvalue_float(b)));
+ }
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_xor(fold_t *fold, ast_value *a, ast_value *b) {
+ if (isfloat(a)) {
+ if (fold_can_2(a, b))
+ return fold_constgen_float(fold, (qcfloat_t)(((qcint_t)fold_immvalue_float(a)) ^ ((qcint_t)fold_immvalue_float(b))), false);
+ } else {
+ if (fold_can_2(a, b)) {
+ if (isvector(b))
+ return fold_constgen_vector(fold, vec3_xor(fold_immvalue_vector(a), fold_immvalue_vector(b)));
+ else
+ return fold_constgen_vector(fold, vec3_xorvf(fold_immvalue_vector(a), fold_immvalue_float(b)));
+ }
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_lshift(fold_t *fold, ast_value *a, ast_value *b) {
+ if (fold_can_2(a, b) && isfloats(a, b))
+ return fold_constgen_float(fold, (qcfloat_t)floorf(fold_immvalue_float(a) * powf(2.0f, fold_immvalue_float(b))), false);
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_rshift(fold_t *fold, ast_value *a, ast_value *b) {
+ if (fold_can_2(a, b) && isfloats(a, b))
+ return fold_constgen_float(fold, (qcfloat_t)floorf(fold_immvalue_float(a) / powf(2.0f, fold_immvalue_float(b))), false);
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_andor(fold_t *fold, ast_value *a, ast_value *b, float expr) {
+ if (fold_can_2(a, b)) {
+ if (OPTS_FLAG(PERL_LOGIC)) {
+ if (expr)
+ return (fold_immediate_true(fold, a)) ? (ast_expression*)a : (ast_expression*)b;
+ else
+ return (fold_immediate_true(fold, a)) ? (ast_expression*)b : (ast_expression*)a;
+ } else {
+ return fold_constgen_float (
+ fold,
+ ((expr) ? (fold_immediate_true(fold, a) || fold_immediate_true(fold, b))
+ : (fold_immediate_true(fold, a) && fold_immediate_true(fold, b)))
+ ? 1
+ : 0,
+ false
+ );
+ }
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_tern(fold_t *fold, ast_value *a, ast_value *b, ast_value *c) {
+ if (fold_can_1(a)) {
+ return fold_immediate_true(fold, a)
+ ? (ast_expression*)b
+ : (ast_expression*)c;
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_exp(fold_t *fold, ast_value *a, ast_value *b) {
+ if (fold_can_2(a, b))
+ return fold_constgen_float(fold, (qcfloat_t)powf(fold_immvalue_float(a), fold_immvalue_float(b)), false);
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_lteqgt(fold_t *fold, ast_value *a, ast_value *b) {
+ if (fold_can_2(a,b)) {
+ fold_check_inexact_float(fold, a, b);
+ if (fold_immvalue_float(a) < fold_immvalue_float(b)) return (ast_expression*)fold->imm_float[2];
+ if (fold_immvalue_float(a) == fold_immvalue_float(b)) return (ast_expression*)fold->imm_float[0];
+ if (fold_immvalue_float(a) > fold_immvalue_float(b)) return (ast_expression*)fold->imm_float[1];
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_ltgt(fold_t *fold, ast_value *a, ast_value *b, bool lt) {
+ if (fold_can_2(a, b)) {
+ fold_check_inexact_float(fold, a, b);
+ return (lt) ? (ast_expression*)fold->imm_float[!!(fold_immvalue_float(a) < fold_immvalue_float(b))]
+ : (ast_expression*)fold->imm_float[!!(fold_immvalue_float(a) > fold_immvalue_float(b))];
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_cmp(fold_t *fold, ast_value *a, ast_value *b, bool ne) {
+ if (fold_can_2(a, b)) {
+ if (isfloat(a) && isfloat(b)) {
+ float la = fold_immvalue_float(a);
+ float lb = fold_immvalue_float(b);
+ fold_check_inexact_float(fold, a, b);
+ return (ast_expression*)fold->imm_float[!(ne ? la == lb : la != lb)];
+ } if (isvector(a) && isvector(b)) {
+ vec3_t la = fold_immvalue_vector(a);
+ vec3_t lb = fold_immvalue_vector(b);
+ return (ast_expression*)fold->imm_float[!(ne ? vec3_cmp(la, lb) : !vec3_cmp(la, lb))];
+ }
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_bnot(fold_t *fold, ast_value *a) {
+ if (isfloat(a)) {
+ if (fold_can_1(a))
+ return fold_constgen_float(fold, -1-fold_immvalue_float(a), false);
+ } else {
+ if (isvector(a)) {
+ if (fold_can_1(a))
+ return fold_constgen_vector(fold, vec3_not(fold_immvalue_vector(a)));
+ }
+ }
+ return NULL;
+}
+
+static GMQCC_INLINE ast_expression *fold_op_cross(fold_t *fold, ast_value *a, ast_value *b) {
+ if (fold_can_2(a, b))
+ return fold_constgen_vector(fold, vec3_cross(fold_ctx(fold),
+ fold_immvalue_vector(a),
+ fold_immvalue_vector(b)));
+ return NULL;
+}
+
ast_expression *fold_op(fold_t *fold, const oper_info *info, ast_expression **opexprs) {
- ast_value *a = (ast_value*)opexprs[0];
- ast_value *b = (ast_value*)opexprs[1];
- ast_value *c = (ast_value*)opexprs[2];
+ ast_value *a = (ast_value*)opexprs[0];
+ ast_value *b = (ast_value*)opexprs[1];
+ ast_value *c = (ast_value*)opexprs[2];
+ ast_expression *e = NULL;
/* can a fold operation be applied to this operator usage? */
if (!info->folds)
switch(info->operands) {
case 3: if(!c) return NULL;
case 2: if(!b) return NULL;
+ case 1:
+ if(!a) {
+ compile_error(fold_ctx(fold), "internal error: fold_op no operands to fold\n");
+ return NULL;
+ }
}
+ /*
+ * we could use a boolean and default case but ironically gcc produces
+ * invalid broken assembly from that operation. clang/tcc get it right,
+ * but interestingly ignore compiling this to a jump-table when I do that,
+ * this happens to be the most efficent method, since you have per-level
+ * granularity on the pointer check happening only for the case you check
+ * it in. Opposed to the default method which would involve a boolean and
+ * pointer check after wards.
+ */
+ #define fold_op_case(ARGS, ARGS_OPID, OP, ARGS_FOLD) \
+ case opid##ARGS ARGS_OPID: \
+ if ((e = fold_op_##OP ARGS_FOLD)) { \
+ ++opts_optimizationcount[OPTIM_CONST_FOLD]; \
+ } \
+ return e
+
switch(info->id) {
- case opid2('-', 'P'):
- return isfloat (a) ? fold_constgen_float (fold, fold_immvalue_float(a))
- : isvector(a) ? fold_constgen_vector(fold, vec3_neg(fold_immvalue_vector(a)))
- : NULL;
- case opid2('!', 'P'):
- return isfloat (a) ? fold_constgen_float (fold, !fold_immvalue_float(a))
- : isvector(a) ? fold_constgen_vector(fold, vec3_not(fold_immvalue_vector(a)))
- : NULL;
- case opid1('+'):
- return isfloats(a,b) ? fold_constgen_float (fold, fold_immvalue_float(a) + fold_immvalue_float(b))
- : isvectors(a,b) ? fold_constgen_vector(fold, vec3_add(fold_immvalue_vector(a), fold_immvalue_vector(b)))
- : NULL;
- case opid1('-'):
- return isfloats(a,b) ? fold_constgen_float (fold, fold_immvalue_float(a) - fold_immvalue_float(b))
- : isvectors(a,b) ? fold_constgen_vector(fold, vec3_sub(fold_immvalue_vector(a), fold_immvalue_vector(b)))
- : NULL;
- case opid1('*'):
- if (isfloat(a))
- return isvector(b) ? fold_constgen_vector(fold, vec3_mulvf(fold_immvalue_vector(b), fold_immvalue_float(a)))
- : fold_constgen_float (fold, fold_immvalue_float(a) * fold_immvalue_float(b));
- return NULL;
- case opid1('/'):
- return isfloats(a,b) ? fold_constgen_float (fold, fold_immvalue_float(a) / fold_immvalue_float(b))
- : isvector(a)&&isfloat(b) ? fold_constgen_vector(fold, vec3_mulvf(fold_immvalue_vector(a), 1.0f / fold_immvalue_float(b)))
- : NULL;
- case opid1('%'):
- return isfloats(a,b) ? fold_constgen_float (fold, (qcfloat_t)(((qcint_t)fold_immvalue_float(a)) % ((qcint_t)fold_immvalue_float(b))))
- : NULL;
- case opid1('|'):
- return isfloats(a,b) ? fold_constgen_float (fold, (qcfloat_t)(((qcint_t)fold_immvalue_float(a)) | ((qcint_t)fold_immvalue_float(b))))
- : NULL;
- case opid1('&'):
- return isfloats(a,b) ? fold_constgen_float (fold, (qcfloat_t)(((qcint_t)fold_immvalue_float(a)) & ((qcint_t)fold_immvalue_float(b))))
- : NULL;
- case opid1('^'):
- return isfloats(a,b) ? fold_constgen_float (fold, (qcfloat_t)(((qcint_t)fold_immvalue_float(a)) ^ ((qcint_t)fold_immvalue_float(b))))
- : isvectors(a,b) ? fold_constgen_vector(fold, vec3_xor (fold_immvalue_vector(a), fold_immvalue_vector(b)))
- : isvector(a)&&isfloat(b) ? fold_constgen_vector(fold, vec3_xorvf(fold_immvalue_vector(a), fold_immvalue_float (b)))
- : NULL;
- case opid2('<','<'):
- return isfloats(a,b) ? fold_constgen_float (fold, (qcfloat_t)(((qcuint_t)(fold_immvalue_float(a)) << ((qcuint_t)fold_immvalue_float(b)))))
- : NULL;
- case opid2('>','>'):
- return isfloats(a,b) ? fold_constgen_float (fold, (qcfloat_t)(((qcuint_t)(fold_immvalue_float(a)) >> ((qcuint_t)fold_immvalue_float(b)))))
- : NULL;
- case opid2('|','|'): return NULL;
- case opid2('&','&'): return NULL;
- case opid2('?',':'): return NULL;
- case opid2('*','*'): return NULL;
- case opid3('<','=','>'): return NULL;
- case opid2('!','='):
- return isfloats(a,b) ? fold_constgen_float (fold, fold_immvalue_float(a) != fold_immvalue_float(b))
- : NULL;
- case opid2('=','='):
- return isfloats(a,b) ? fold_constgen_float (fold, fold_immvalue_float(a) == fold_immvalue_float(b))
- : NULL;
- case opid2('~','P'):
- return isfloat(a) ? fold_constgen_float (fold, ~(qcint_t)fold_immvalue_float(a))
- : NULL;
+ fold_op_case(2, ('-', 'P'), neg, (fold, a));
+ fold_op_case(2, ('!', 'P'), not, (fold, a));
+ fold_op_case(1, ('+'), add, (fold, a, b));
+ fold_op_case(1, ('-'), sub, (fold, a, b));
+ fold_op_case(1, ('*'), mul, (fold, a, b));
+ fold_op_case(1, ('/'), div, (fold, a, b));
+ fold_op_case(1, ('%'), mod, (fold, a, b));
+ fold_op_case(1, ('|'), bor, (fold, a, b));
+ fold_op_case(1, ('&'), band, (fold, a, b));
+ fold_op_case(1, ('^'), xor, (fold, a, b));
+ fold_op_case(1, ('<'), ltgt, (fold, a, b, true));
+ fold_op_case(1, ('>'), ltgt, (fold, a, b, false));
+ fold_op_case(2, ('<', '<'), lshift, (fold, a, b));
+ fold_op_case(2, ('>', '>'), rshift, (fold, a, b));
+ fold_op_case(2, ('|', '|'), andor, (fold, a, b, true));
+ fold_op_case(2, ('&', '&'), andor, (fold, a, b, false));
+ fold_op_case(2, ('?', ':'), tern, (fold, a, b, c));
+ fold_op_case(2, ('*', '*'), exp, (fold, a, b));
+ fold_op_case(3, ('<','=','>'), lteqgt, (fold, a, b));
+ fold_op_case(2, ('!', '='), cmp, (fold, a, b, true));
+ fold_op_case(2, ('=', '='), cmp, (fold, a, b, false));
+ fold_op_case(2, ('~', 'P'), bnot, (fold, a));
+ fold_op_case(2, ('>', '<'), cross, (fold, a, b));
+ }
+ #undef fold_op_case
+ compile_error(fold_ctx(fold), "internal error: attempted to constant-fold for unsupported operator");
+ return NULL;
+}
+
+/*
+ * Constant folding for compiler intrinsics, simaler approach to operator
+ * folding, primarly: individual functions for each intrinsics to fold,
+ * and a generic selection function.
+ */
+static GMQCC_INLINE ast_expression *fold_intrin_isfinite(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, isfinite(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_isinf(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, isinf(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_isnan(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, isnan(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_isnormal(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, isnormal(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_signbit(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, signbit(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intirn_acosh(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, acoshf(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_asinh(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, asinhf(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_atanh(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, (float)atanh(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_exp(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, expf(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_exp2(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, exp2f(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_expm1(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, expm1f(fold_immvalue_float(a)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_mod(fold_t *fold, ast_value *lhs, ast_value *rhs) {
+ return fold_constgen_float(fold, fmodf(fold_immvalue_float(lhs), fold_immvalue_float(rhs)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_pow(fold_t *fold, ast_value *lhs, ast_value *rhs) {
+ return fold_constgen_float(fold, powf(fold_immvalue_float(lhs), fold_immvalue_float(rhs)), false);
+}
+static GMQCC_INLINE ast_expression *fold_intrin_fabs(fold_t *fold, ast_value *a) {
+ return fold_constgen_float(fold, fabsf(fold_immvalue_float(a)), false);
+}
+
+
+ast_expression *fold_intrin(fold_t *fold, const char *intrin, ast_expression **arg) {
+ ast_expression *ret = NULL;
+ ast_value *a = (ast_value*)arg[0];
+ ast_value *b = (ast_value*)arg[1];
+
+ if (!strcmp(intrin, "isfinite")) ret = fold_intrin_isfinite(fold, a);
+ if (!strcmp(intrin, "isinf")) ret = fold_intrin_isinf(fold, a);
+ if (!strcmp(intrin, "isnan")) ret = fold_intrin_isnan(fold, a);
+ if (!strcmp(intrin, "isnormal")) ret = fold_intrin_isnormal(fold, a);
+ if (!strcmp(intrin, "signbit")) ret = fold_intrin_signbit(fold, a);
+ if (!strcmp(intrin, "acosh")) ret = fold_intirn_acosh(fold, a);
+ if (!strcmp(intrin, "asinh")) ret = fold_intrin_asinh(fold, a);
+ if (!strcmp(intrin, "atanh")) ret = fold_intrin_atanh(fold, a);
+ if (!strcmp(intrin, "exp")) ret = fold_intrin_exp(fold, a);
+ if (!strcmp(intrin, "exp2")) ret = fold_intrin_exp2(fold, a);
+ if (!strcmp(intrin, "expm1")) ret = fold_intrin_expm1(fold, a);
+ if (!strcmp(intrin, "mod")) ret = fold_intrin_mod(fold, a, b);
+ if (!strcmp(intrin, "pow")) ret = fold_intrin_pow(fold, a, b);
+ if (!strcmp(intrin, "fabs")) ret = fold_intrin_fabs(fold, a);
+
+ if (ret)
+ ++opts_optimizationcount[OPTIM_CONST_FOLD];
+
+ return ret;
+}
+
+/*
+ * These are all the actual constant folding methods that happen in between
+ * the AST/IR stage of the compiler , i.e eliminating branches for const
+ * expressions, which is the only supported thing so far. We undefine the
+ * testing macros here because an ir_value is differant than an ast_value.
+ */
+#undef expect
+#undef isfloat
+#undef isstring
+#undef isvector
+#undef fold_immvalue_float
+#undef fold_immvalue_string
+#undef fold_immvalue_vector
+#undef fold_can_1
+#undef fold_can_2
+
+#define isfloat(X) ((X)->vtype == TYPE_FLOAT)
+/*#define isstring(X) ((X)->vtype == TYPE_STRING)*/
+/*#define isvector(X) ((X)->vtype == TYPE_VECTOR)*/
+#define fold_immvalue_float(X) ((X)->constval.vfloat)
+#define fold_immvalue_vector(X) ((X)->constval.vvec)
+/*#define fold_immvalue_string(X) ((X)->constval.vstring)*/
+#define fold_can_1(X) ((X)->hasvalue && (X)->cvq == CV_CONST)
+/*#define fold_can_2(X,Y) (fold_can_1(X) && fold_can_1(Y))*/
+
+static ast_expression *fold_superfluous(ast_expression *left, ast_expression *right, int op) {
+ ast_expression *swapped = NULL; /* using this as bool */
+ ast_value *load;
+
+ if (!ast_istype(right, ast_value) || !fold_can_1((load = (ast_value*)right))) {
+ swapped = left;
+ left = right;
+ right = swapped;
+ }
+
+ if (!ast_istype(right, ast_value) || !fold_can_1((load = (ast_value*)right)))
+ return NULL;
+
+ switch (op) {
+ case INSTR_DIV_F:
+ if (swapped)
+ return NULL;
+ case INSTR_MUL_F:
+ if (fold_immvalue_float(load) == 1.0f) {
+ ++opts_optimizationcount[OPTIM_PEEPHOLE];
+ ast_unref(right);
+ return left;
+ }
+ break;
+
+
+ case INSTR_SUB_F:
+ if (swapped)
+ return NULL;
+ case INSTR_ADD_F:
+ if (fold_immvalue_float(load) == 0.0f) {
+ ++opts_optimizationcount[OPTIM_PEEPHOLE];
+ ast_unref(right);
+ return left;
+ }
+ break;
+
+ case INSTR_MUL_V:
+ if (vec3_cmp(fold_immvalue_vector(load), vec3_create(1, 1, 1))) {
+ ++opts_optimizationcount[OPTIM_PEEPHOLE];
+ ast_unref(right);
+ return left;
+ }
+ break;
+
+ case INSTR_SUB_V:
+ if (swapped)
+ return NULL;
+ case INSTR_ADD_V:
+ if (vec3_cmp(fold_immvalue_vector(load), vec3_create(0, 0, 0))) {
+ ++opts_optimizationcount[OPTIM_PEEPHOLE];
+ ast_unref(right);
+ return left;
+ }
break;
}
+
return NULL;
}
+
+ast_expression *fold_binary(lex_ctx_t ctx, int op, ast_expression *left, ast_expression *right) {
+ ast_expression *ret = fold_superfluous(left, right, op);
+ if (ret)
+ return ret;
+ return (ast_expression*)ast_binary_new(ctx, op, left, right);
+}
+
+static GMQCC_INLINE int fold_cond(ir_value *condval, ast_function *func, ast_ifthen *branch) {
+ if (isfloat(condval) && fold_can_1(condval) && OPTS_OPTIMIZATION(OPTIM_CONST_FOLD_DCE)) {
+ ast_expression_codegen *cgen;
+ ir_block *elide;
+ ir_value *dummy;
+ bool istrue = (fold_immvalue_float(condval) != 0.0f && branch->on_true);
+ bool isfalse = (fold_immvalue_float(condval) == 0.0f && branch->on_false);
+ ast_expression *path = (istrue) ? branch->on_true :
+ (isfalse) ? branch->on_false : NULL;
+ if (!path) {
+ /*
+ * no path to take implies that the evaluation is if(0) and there
+ * is no else block. so eliminate all the code.
+ */
+ ++opts_optimizationcount[OPTIM_CONST_FOLD_DCE];
+ return true;
+ }
+
+ if (!(elide = ir_function_create_block(ast_ctx(branch), func->ir_func, ast_function_label(func, ((istrue) ? "ontrue" : "onfalse")))))
+ return false;
+ if (!(*(cgen = path->codegen))((ast_expression*)path, func, false, &dummy))
+ return false;
+ if (!ir_block_create_jump(func->curblock, ast_ctx(branch), elide))
+ return false;
+ /*
+ * now the branch has been eliminated and the correct block for the constant evaluation
+ * is expanded into the current block for the function.
+ */
+ func->curblock = elide;
+ ++opts_optimizationcount[OPTIM_CONST_FOLD_DCE];
+ return true;
+ }
+ return -1; /* nothing done */
+}
+
+int fold_cond_ternary(ir_value *condval, ast_function *func, ast_ternary *branch) {
+ return fold_cond(condval, func, (ast_ifthen*)branch);
+}
+
+int fold_cond_ifthen(ir_value *condval, ast_function *func, ast_ifthen *branch) {
+ return fold_cond(condval, func, branch);
+}
projects / xonotic / gmqcc.git / blobdiff