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glsl: Add utility function to round and pack uint64_t value

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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
2018-12-07 15:05:39 -08:00
committed by Matt Turner
parent c9d333a6b7
commit 5a87441807
1 changed files with 32 additions and 0 deletions
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32
src/compiler/glsl/float64.glsl
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@@ -451,6 +451,38 @@ __roundAndPackFloat64(uint zSign,
return __packFloat64(zSign, zExp, zFrac0, zFrac1);
}
uint64_t
__roundAndPackUInt64(uint zSign, uint zFrac0, uint zFrac1, uint zFrac2)
{
bool roundNearestEven;
bool increment;
uint64_t default_nan = 0xFFFFFFFFFFFFFFFFUL;
roundNearestEven = FLOAT_ROUNDING_MODE == FLOAT_ROUND_NEAREST_EVEN;
if (zFrac2 >= 0x80000000u)
increment = false;
if (!roundNearestEven) {
if (zSign != 0u) {
if ((FLOAT_ROUNDING_MODE == FLOAT_ROUND_DOWN) && (zFrac2 != 0u)) {
increment = false;
}
} else {
increment = (FLOAT_ROUNDING_MODE == FLOAT_ROUND_UP) &&
(zFrac2 != 0u);
}
}
if (increment) {
__add64(zFrac0, zFrac1, 0u, 1u, zFrac0, zFrac1);
if ((zFrac0 | zFrac1) != 0u)
zFrac1 &= ~(1u) + uint(zFrac2 == 0u) & uint(roundNearestEven);
}
return mix(packUint2x32(uvec2(zFrac1, zFrac0)), default_nan,
(zSign !=0u && (zFrac0 | zFrac1) != 0u));
}
/* Returns the number of leading 0 bits before the most-significant 1 bit of
* `a'. If `a' is zero, 32 is returned.
*/