From: Wolfgang Bumiller <blub@speed.at>
Date: Sat, 29 Dec 2012 14:10:04 +0000 (+0100)
Subject: manpage: -Ovector-components
X-Git-Tag: before-library~433^2~2
X-Git-Url: https://git.xonotic.org/?p=xonotic%2Fgmqcc.git;a=commitdiff_plain;h=3d67b29a7b56ba2eb975d13bae10e530c36aa8d3

manpage: -Ovector-components
---

diff --git a/doc/gmqcc.1 b/doc/gmqcc.1
index 697a3fc..bb26022 100644
--- a/doc/gmqcc.1
+++ b/doc/gmqcc.1
@@ -490,6 +490,15 @@ instruction is added for several reasons. (For example the qcvm's
 disassemble switch uses it to know when the function ends.). This
 optimization replaces that last RETURN with DONE rather than adding
 the DONE additionally.
+.TP
+.B -Ovector-components
+Because traditional QC code doesn't allow you to access individual
+vector components of a computed vector without storing it in a local
+first, sometimes people multiply it by a constant like '0 1 0' to get,
+in this case, the y component of a vector. This optimization will turn
+such a multiplication into a direct component access. If the factor is
+anything other than 1, a float-multiplication will be added, which is
+still faster than a vector multiplication.
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