X-Git-Url: https://git.xonotic.org/?p=xonotic%2Fgmqcc.git;a=blobdiff_plain;f=fold.c;h=5352b78f531b801fd5c9f97b6853388d6067a07a;hp=26b598500dc1d99d79864c72ec8cab1117cca029;hb=5f2b7e3d57af89e32db489664ed5b6363294ce8b;hpb=920dbaf1e09f6dce8cc8dd703ed2bfdec62fae38 diff --git a/fold.c b/fold.c index 26b5985..5352b78 100644 --- a/fold.c +++ b/fold.c @@ -21,6 +21,8 @@ * SOFTWARE. */ #include +#include + #include "ast.h" #include "parser.h" @@ -35,20 +37,11 @@ * * 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 @@ -72,14 +65,6 @@ static GMQCC_INLINE vec3_t vec3_sub(vec3_t a, vec3_t b) { return out; } -static GMQCC_INLINE vec3_t vec3_not(vec3_t a) { - vec3_t out; - out.x = !a.x; - out.y = !a.y; - out.z = !a.z; - return out; -} - static GMQCC_INLINE vec3_t vec3_neg(vec3_t a) { vec3_t out; out.x = -a.x; @@ -90,25 +75,23 @@ static GMQCC_INLINE vec3_t vec3_neg(vec3_t a) { 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; } -#if 0 static GMQCC_INLINE qcfloat_t vec3_mulvv(vec3_t a, vec3_t b) { 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; @@ -132,19 +115,58 @@ static GMQCC_INLINE vec3_t vec3_create(float x, float y, float z) { return out; } +static GMQCC_INLINE qcfloat_t vec3_notf(vec3_t a) { + return (!a.x && !a.y && !a.z); +} -static GMQCC_INLINE float fold_immvalue_float(ast_value *expr) { - return expr->constval.vfloat; +static GMQCC_INLINE bool vec3_pbool(vec3_t a) { + return (a.x && a.y && a.z); } -static GMQCC_INLINE vec3_t fold_immvalue_vector(ast_value *expr) { - return expr->constval.vvec; + +static GMQCC_INLINE bool fold_can_1(const ast_value *val) { + return (ast_istype(((ast_expression*)(val)), ast_value) && val->hasvalue && (val->cvq == CV_CONST) && + ((ast_expression*)(val))->vtype != TYPE_FUNCTION); } -#if 0 -static GMQCC_INLINE const char *fold_immvalue_string(ast_value *expr) { - return expr->constval.vstring; + +static GMQCC_INLINE bool fold_can_2(const ast_value *v1, const ast_value *v2) { + return fold_can_1(v1) && fold_can_1(v2); } -#endif +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; +} + +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; +} + +#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)); @@ -205,15 +227,6 @@ void fold_cleanup(fold_t *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_value *out = NULL; size_t i; @@ -279,6 +292,254 @@ ast_expression *fold_constgen_string(fold_t *fold, const char *str, bool transla 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) + return (ast_expression*)ast_binary_new(fold_ctx(fold), INSTR_MUL_F, fold_constgen_float(fold, x), 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)); + } 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)); + } else if (isvector(a)) { + if (fold_can_1(a)) + return fold_constgen_float(fold, vec3_notf(fold_immvalue_vector(a))); + } else if (isstring(a)) { + if (fold_can_1(a)) { + if (OPTS_FLAG(TRUE_EMPTY_STRINGS)) + return fold_constgen_float(fold, !fold_immvalue_string(a)); + else + return fold_constgen_float(fold, !fold_immvalue_string(a) || !*fold_immvalue_string(a)); + } + } + return NULL; +} + +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)) + return fold_constgen_float(fold, fold_immvalue_float(a) + fold_immvalue_float(b)); + } else if (isvector(a)) { + if (fold_can_2(a, b)) + return fold_constgen_vector(fold, vec3_add(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)) + return fold_constgen_float(fold, fold_immvalue_float(a) - fold_immvalue_float(b)); + } else if (isvector(a)) { + if (fold_can_2(a, b)) + return fold_constgen_vector(fold, vec3_sub(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 (isfloat(b) && fold_can_2(a, b)) + return fold_constgen_vector(fold, vec3_mulvf(fold_immvalue_vector(b), fold_immvalue_float(a))); + else if (fold_can_2(a, b)) + return fold_constgen_float(fold, fold_immvalue_float(a) * fold_immvalue_float(b)); + } else if (isvector(a)) { + if (isfloat(b) && fold_can_2(a, b)) { + return fold_constgen_vector(fold, vec3_mulvf(fold_immvalue_vector(a), fold_immvalue_float(b))); + } else { + if (fold_can_2(a, b)) { + return fold_constgen_float(fold, vec3_mulvv(fold_immvalue_vector(a), fold_immvalue_vector(b))); + } 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)) + return fold_constgen_float(fold, fold_immvalue_float(a) / fold_immvalue_float(b)); + } else if (isvector(a)) { + if (fold_can_2(a, b)) + return fold_constgen_vector(fold, vec3_mulvf(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)) + : (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) { + 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)))); + return NULL; +} + +static GMQCC_INLINE ast_expression *fold_op_bor(fold_t *fold, ast_value *a, ast_value *b) { + 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)))); + return NULL; +} + +static GMQCC_INLINE ast_expression *fold_op_band(fold_t *fold, ast_value *a, ast_value *b) { + 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)))); + 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)))); + } else { + if (isvector(b)) { + if (fold_can_2(a, b)) + return fold_constgen_vector(fold, vec3_xor(fold_immvalue_vector(a), fold_immvalue_vector(b))); + } else { + if (fold_can_2(a, b)) + 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)((qcuint_t)(fold_immvalue_float(a)) << (qcuint_t)(fold_immvalue_float(b)))); + 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)((qcuint_t)(fold_immvalue_float(a)) >> (qcuint_t)(fold_immvalue_float(b)))); + return NULL; +} + +static GMQCC_INLINE ast_expression *fold_op_andor(fold_t *fold, ast_value *a, ast_value *b, float or) { + if (fold_can_2(a, b)) { + if (OPTS_FLAG(PERL_LOGIC)) { + if (fold_immediate_true(fold, a)) + return (ast_expression*)b; + } else { + return fold_constgen_float ( + fold, + ((or) ? (fold_immediate_true(fold, a) || fold_immediate_true(fold, b)) + : (fold_immediate_true(fold, a) && fold_immediate_true(fold, b))) + ? 1 + : 0 + ); + } + } + 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))); + 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)) { + 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_cmp(fold_t *fold, ast_value *a, ast_value *b, bool ne) { + if (fold_can_2(a, b)) { + return fold_constgen_float( + fold, + (ne) ? (fold_immvalue_float(a) != fold_immvalue_float(b)) + : (fold_immvalue_float(a) == fold_immvalue_float(b)) + ); + } + return NULL; +} + +static GMQCC_INLINE ast_expression *fold_op_bnot(fold_t *fold, ast_value *a) { + if (fold_can_1(a)) + return fold_constgen_float(fold, ~((qcint_t)fold_immvalue_float(a))); + 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]; @@ -291,69 +552,34 @@ ast_expression *fold_op(fold_t *fold, const oper_info *info, ast_expression **op switch(info->operands) { case 3: if(!c) return NULL; case 2: if(!b) return NULL; + case 1: + if(!a) { + compile_error(fold_ctx(fold), "interal error: fold_op no operands to fold\n"); + return NULL; + } } 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; - break; + case opid2('-','P'): return fold_op_neg (fold, a); + case opid2('!','P'): return fold_op_not (fold, a); + case opid1('+'): return fold_op_add (fold, a, b); + case opid1('-'): return fold_op_sub (fold, a, b); + case opid1('*'): return fold_op_mul (fold, a, b); + case opid1('/'): return fold_op_div (fold, a, b); + case opid1('%'): return fold_op_mod (fold, a, b); + case opid1('|'): return fold_op_bor (fold, a, b); + case opid1('&'): return fold_op_band (fold, a, b); + case opid1('^'): return fold_op_xor (fold, a, b); + case opid2('<','<'): return fold_op_lshift (fold, a, b); + case opid2('>','>'): return fold_op_rshift (fold, a, b); + case opid2('|','|'): return fold_op_andor (fold, a, b, true); + case opid2('&','&'): return fold_op_andor (fold, a, b, false); + case opid2('?',':'): return fold_op_tern (fold, a, b, c); + case opid2('*','*'): return fold_op_exp (fold, a, b); + case opid3('<','=','>'): return fold_op_lteqgt (fold, a, b); + case opid2('!','='): return fold_op_cmp (fold, a, b, true); + case opid2('=','='): return fold_op_cmp (fold, a, b, false); + case opid2('~','P'): return fold_op_bnot (fold, a); } return NULL; }