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cLib_offsetPos param aliasing fix

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Pheenoh
2026-04-26 15:30:51 -06:00
parent 90c0bdded0
commit 0f9d563a3e
1 changed files with 11 additions and 0 deletions
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src/SSystem/SComponent/c_lib.cpp
+11
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@@ -468,9 +468,20 @@ s16 cLib_targetAngleX(cXyz const* lhs, cXyz const* rhs) {
void cLib_offsetPos(cXyz* pdest, cXyz const* psrc, s16 angle, cXyz const* vec) {
f32 cos = cM_scos(angle);
f32 sin = cM_ssin(angle);
// MWCC loads vec members into registers before writing to pdest; other compilers may not,
// which corrupts results when pdest and vec alias the same memory.
#if !__MWERKS__
f32 vx = vec->x;
f32 vy = vec->y;
f32 vz = vec->z;
pdest->x = psrc->x + (vx * cos + vz * sin);
pdest->y = psrc->y + vy;
pdest->z = psrc->z + (vz * cos - vx * sin);
#else
pdest->x = psrc->x + (vec->x * cos + vec->z * sin);
pdest->y = psrc->y + vec->y;
pdest->z = psrc->z + (vec->z * cos - vec->x * sin);
#endif
}
/**