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glsl: Add "built-in" functions to do uint64_to_fp64(uint64_t)

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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 2018-11-30 11:50:44 -08:00 • committed by Matt Turner
parent 15757bc80b
commit 7c5b982b89
1 changed files with 18 additions and 0 deletions
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18
src/compiler/glsl/float64.glsl
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@ -887,6 +887,24 @@ __uint_to_fp64(uint a)
return __packFloat64(0u, 0x432 - shiftDist, aHigh, aLow);
}
uint64_t
__uint64_to_fp64(uint64_t a)
{
if (a == 0u)
return 0ul;
uvec2 aFrac = unpackUint2x32(a);
uint aFracLo = __extractFloat64FracLo(a);
uint aFracHi = __extractFloat64FracHi(a);
if ((aFracHi & 0x80000000u) != 0u) {
__shift64RightJamming(aFracHi, aFracLo, 1, aFracHi, aFracLo);
return __roundAndPackFloat64(0, 0x433, aFracHi, aFracLo, 0u);
} else {
return __normalizeRoundAndPackFloat64(0, 0x432, aFrac.y, aFrac.x);
}
}
/* Returns the result of converting the double-precision floating-point value
* `a' to the 32-bit two's complement integer format. The conversion is
* performed according to the IEEE Standard for Floating-Point Arithmetic---