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glsl: Add "built-in" functions to do int64_to_fp64(int64_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
2018-12-03 12:09:38 -08:00
committed by Matt Turner
parent 7c5b982b89
commit b830efb191
1 changed files with 18 additions and 0 deletions
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18
src/compiler/glsl/float64.glsl
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@@ -905,6 +905,24 @@ __uint64_to_fp64(uint64_t a)
} }
} }
uint64_t
__int64_to_fp64(int64_t a)
{
if (a==0)
return 0ul;
uint64_t absA = mix(uint64_t(a), uint64_t(-a), a < 0);
uint aFracHi = __extractFloat64FracHi(absA);
uvec2 aFrac = unpackUint2x32(absA);
uint zSign = uint(a < 0);
if ((aFracHi & 0x80000000u) != 0u) {
return mix(0ul, __packFloat64(1, 0x434, 0u, 0u), a < 0);
}
return __normalizeRoundAndPackFloat64(zSign, 0x432, aFrac.y, aFrac.x);
}
/* Returns the result of converting the double-precision floating-point value /* Returns the result of converting the double-precision floating-point value
* `a' to the 32-bit two's complement integer format. The conversion is * `a' to the 32-bit two's complement integer format. The conversion is
* performed according to the IEEE Standard for Floating-Point Arithmetic--- * performed according to the IEEE Standard for Floating-Point Arithmetic---