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glsl: Add "built-in" functions to do fp64_to_int64(fp64)

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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 11:25:19 -08:00
committed by Matt Turner
parent 21e9bb2b3f
commit 876a4b85fe
1 changed files with 29 additions and 0 deletions
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29
src/compiler/glsl/float64.glsl
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@@ -1000,6 +1000,35 @@ __fp64_to_uint64(uint64_t a)
return __roundAndPackUInt64(aSign, aFracHi, aFracLo, zFrac2);
}
int64_t
__fp64_to_int64(uint64_t a)
{
uint zFrac2 = 0u;
uint aFracLo = __extractFloat64FracLo(a);
uint aFracHi = __extractFloat64FracHi(a);
int aExp = __extractFloat64Exp(a);
uint aSign = __extractFloat64Sign(a);
int64_t default_NegNaN = -0x7FFFFFFFFFFFFFFEL;
int64_t default_PosNaN = 0xFFFFFFFFFFFFFFFFL;
aFracHi = mix(aFracHi, aFracHi | 0x00100000u, aExp != 0);
int shiftCount = 0x433 - aExp;
if (shiftCount <= 0) {
if (shiftCount < -11 && aExp == 0x7FF) {
if ((aFracHi | aFracLo) != 0u)
return default_NegNaN;
return mix(default_NegNaN, default_PosNaN, aSign == 0u);
}
__shortShift64Left(aFracHi, aFracLo, -shiftCount, aFracHi, aFracLo);
} else {
__shift64ExtraRightJamming(aFracHi, aFracLo, zFrac2, shiftCount,
aFracHi, aFracLo, zFrac2);
}
return __roundAndPackInt64(aSign, aFracHi, aFracLo, zFrac2);
}
uint64_t
__int64_to_fp64(int64_t a)
{