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glsl: Add "built-in" functions to do fp32_to_int64(fp32) 

Reviewed-by: Elie Tournier <tournier.elie@gmail.com>
Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
This commit is contained in:
Sagar Ghuge 2018-12-11 12:58:36 -08:00 committed by Matt Turner
parent 2632c12477
commit f998ce4111
1 changed files with 31 additions and 0 deletions
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31
src/compiler/glsl/float64.glsl
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@ -1058,6 +1058,37 @@ __fp32_to_uint64(float f)
return __roundAndPackUInt64(aSign, zFrac0, zFrac1, zFrac2);
}
int64_t
__fp32_to_int64(float f)
{
uint a = floatBitsToUint(f);
uint aFrac = a & 0x007FFFFFu;
int aExp = int((a>>23) & 0xFFu);
uint aSign = a>>31;
uint zFrac0 = 0u;
uint zFrac1 = 0u;
uint zFrac2 = 0u;
int64_t default_NegNaN = -0x7FFFFFFFFFFFFFFEL;
int64_t default_PosNaN = 0xFFFFFFFFFFFFFFFFL;
int shiftCount = 0xBE - aExp;
if (shiftCount <0) {
if (aExp == 0xFF && aFrac != 0u)
return default_NegNaN;
return mix(default_NegNaN, default_PosNaN, aSign == 0u);
}
aFrac = mix(aFrac, aFrac | 0x00800000u, aExp != 0);
__shortShift64Left(aFrac, 0, 40, zFrac0, zFrac1);
if (shiftCount != 0) {
__shift64ExtraRightJamming(zFrac0, zFrac1, zFrac2, shiftCount,
zFrac0, zFrac1, zFrac2);
}
return __roundAndPackInt64(aSign, zFrac0, zFrac1, zFrac2);
}
uint64_t
__int64_to_fp64(int64_t a)
{