mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2025-03-22 02:11:19 +00:00
3c67e8f020
It was pointed out by Blub\w (gmqcc) that OP_MUL_FV and friends were buggy when the operands overlapped (eg, x = x.x * x) as the result would become 'x.x*x.x x.y*x.x*x.x x.z*x.x*x.x' (note the x.x squared for y and z). On testing, sure enough the bug was present (and is a nice demonstration that QF's VM does NOT have strict-aliasing bugs). As a very nice benefit: the code produced by the fixes is actually faster than the broken version :). The ruamoko code used for testing: void (string fmt, ...) printf = #0; vector foo (vector x) { x = x * x.x; return x; } vector bar (vector x) { x = x.x * x; return x; } int main () { vector x = '2 3 4'; vector y = foo (x); vector z = bar (x); printf ("x=%v y=%v z=%v 2*x=%v\n", x, y, z, 2*x); return 0; } |
||
|---|---|---|
| .. | ||
| audio | ||
| client | ||
| console | ||
| gamecode | ||
| gib | ||
| image | ||
| models | ||
| net | ||
| qw | ||
| ruamoko | ||
| util | ||
| video | ||
| Makefile.am | ||