From 5a87441807cbb6238c513f2d4c74e464c1a310ca Mon Sep 17 00:00:00 2001 From: Sagar Ghuge Date: Fri, 7 Dec 2018 15:05:39 -0800 Subject: [PATCH] glsl: Add utility function to round and pack uint64_t value Reviewed-by: Elie Tournier Signed-off-by: Sagar Ghuge --- src/compiler/glsl/float64.glsl | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/src/compiler/glsl/float64.glsl b/src/compiler/glsl/float64.glsl index 6a763ffdab0..c6ba37221af 100644 --- a/src/compiler/glsl/float64.glsl +++ b/src/compiler/glsl/float64.glsl @@ -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. */ -- 2.30.2