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glsl: Add "built-in" functions to do uint64_to_fp32(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
2018-12-05 17:02:42 -08:00
committed by Matt Turner
parent b830efb191
commit d5cf6e92b4
1 changed files with 20 additions and 0 deletions
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20
src/compiler/glsl/float64.glsl
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@@ -1100,6 +1100,26 @@ __fp64_to_fp32(uint64_t __a)
return __roundAndPackFloat32(aSign, aExp - 0x381, zFrac);
}
float
__uint64_to_fp32(uint64_t __a)
{
uint zFrac = 0u;
uvec2 aFrac = unpackUint2x32(__a);
int shiftCount = __countLeadingZeros32(mix(aFrac.y, aFrac.x, aFrac.y == 0u));
shiftCount -= mix(40, 8, aFrac.y == 0u);
if (0 <= shiftCount) {
__shortShift64Left(aFrac.y, aFrac.x, shiftCount, aFrac.y, aFrac.x);
bool is_zero = (aFrac.y | aFrac.x) == 0u;
return mix(__packFloat32(0u, 0x95 - shiftCount, aFrac.x), 0, is_zero);
}
shiftCount += 7;
__shift64RightJamming(aFrac.y, aFrac.x, -shiftCount, aFrac.y, aFrac.x);
zFrac = mix(aFrac.x<<shiftCount, aFrac.x, shiftCount < 0);
return __roundAndPackFloat32(0u, 0x9C - shiftCount, zFrac);
}
/* Returns the result of converting the single-precision floating-point value
* `a' to the double-precision floating-point format.
*/