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glsl: Fix round64 conversion function

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Fix round64 function to handle round to nearest even cases specially
with positive and negative numbers with fraction part 0.5.

v2: 1) Simplify unused bits (Elie Tournier)

Fixes:
   KHR-GL45.gpu_shader_fp64.builtin.round_dvec2
   KHR-GL45.gpu_shader_fp64.builtin.round_dvec3
   KHR-GL45.gpu_shader_fp64.builtin.round_dvec4
   KHR-GL45.gpu_shader_fp64.builtin.roundeven_double
   KHR-GL45.gpu_shader_fp64.builtin.roundeven_dvec2
   KHR-GL45.gpu_shader_fp64.builtin.roundeven_dvec3
   KHR-GL45.gpu_shader_fp64.builtin.roundeven_dvec4

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Elie Tournier <elie.tournier@collabora.com>
Acked-by: Anuj Phogat <anuj.phogat@gmail.com>
This commit is contained in:
Sagar Ghuge 2019-06-24 15:10:53 -07:00
parent e8f4c9f56c
commit 06807e1948
1 changed files with 12 additions and 9 deletions
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21
src/compiler/glsl/float64.glsl
View file

@ -1693,17 +1693,22 @@ __fround64(uint64_t __a)
if (unbiasedExp < 20) {
if (unbiasedExp < 0) {
if ((aHi & 0x80000000u) != 0u && aLo == 0u) {
return 0;
}
aHi &= 0x80000000u;
if (unbiasedExp == -1 && aLo != 0u)
aHi |= (1023u << 20);
if ((a.y & 0x000FFFFFu) == 0u && a.x == 0u) {
aLo = 0u;
return packUint2x32(uvec2(aLo, aHi));
}
aHi = mix(aHi, (aHi | 0x3FF00000u), unbiasedExp == -1);
aLo = 0u;
} else {
uint maskExp = 0x000FFFFFu >> unbiasedExp;
/* a is an integral value */
if (((aHi & maskExp) == 0u) && (aLo == 0u))
return __a;
uint lastBit = maskExp + 1;
aHi += 0x00080000u >> unbiasedExp;
if ((aHi & maskExp) == 0u)
aHi &= ~lastBit;
aHi &= ~maskExp;
aLo = 0u;
}
@ -1720,9 +1725,7 @@ __fround64(uint64_t __a)
aLo &= ~maskExp;
}
a.x = aLo;
a.y = aHi;
return packUint2x32(a);
return packUint2x32(uvec2(aLo, aHi));
}
uint64_t