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tgsi: Clamp the source argument in micro_exp2() to avoid Inf.

This commit is contained in:
Michal Krol 2009-11-23 11:32:58 +01:00
parent eacdd8fa75
commit c511e0b844
1 changed files with 18 additions and 0 deletions
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18
src/gallium/auxiliary/tgsi/tgsi_exec.c
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@ -578,6 +578,24 @@ micro_exp2(
dst->f[2] = util_fast_exp2( src->f[2] );
dst->f[3] = util_fast_exp2( src->f[3] );
#else
#if DEBUG
/* Inf is okay for this instruction, so clamp it to silence assertions. */
uint i;
union tgsi_exec_channel clamped;
for (i = 0; i < 4; i++) {
if (src->f[i] > 127.99999f) {
clamped.f[i] = 127.99999f;
} else if (src->f[i] < -126.99999f) {
clamped.f[i] = -126.99999f;
} else {
clamped.f[i] = src->f[i];
}
}
src = &clamped;
#endif
dst->f[0] = powf( 2.0f, src->f[0] );
dst->f[1] = powf( 2.0f, src->f[1] );
dst->f[2] = powf( 2.0f, src->f[2] );