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mesa: fix strict aliasing issues in half-to-float/float-to-half conversions

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use union instead of casts
This commit is contained in:
Roland Scheidegger 2009-12-07 20:11:46 +01:00
parent 7d9b2edb97
commit c36d1aacf4
1 changed files with 9 additions and 8 deletions
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17
src/mesa/main/imports.c
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@ -460,7 +460,7 @@ _mesa_inv_sqrtf(float n)
#if 0 /* not used, see below -BP */
float r3, x3, y3;
#endif
union { float f; unsigned int i; } u;
fi_type u;
unsigned int magic;
/*
@ -649,10 +649,10 @@ _mesa_bitcount(unsigned int n)
GLhalfARB
_mesa_float_to_half(float val)
{
const int flt = *((int *) (void *) &val);
const int flt_m = flt & 0x7fffff;
const int flt_e = (flt >> 23) & 0xff;
const int flt_s = (flt >> 31) & 0x1;
const fi_type fi = {val};
const int flt_m = fi.i & 0x7fffff;
const int flt_e = (fi.i >> 23) & 0xff;
const int flt_s = (fi.i >> 31) & 0x1;
int s, e, m = 0;
GLhalfARB result;
@ -739,7 +739,8 @@ _mesa_half_to_float(GLhalfARB val)
const int m = val & 0x3ff;
const int e = (val >> 10) & 0x1f;
const int s = (val >> 15) & 0x1;
int flt_m, flt_e, flt_s, flt;
int flt_m, flt_e, flt_s;
fi_type fi;
float result;
/* sign bit */
@ -774,8 +775,8 @@ _mesa_half_to_float(GLhalfARB val)
flt_m = m << 13;
}
flt = (flt_s << 31) | (flt_e << 23) | flt_m;
result = *((float *) (void *) &flt);
fi.i = (flt_s << 31) | (flt_e << 23) | flt_m;
result = fi.f;
return result;
}