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spriv: Produce correct result for GLSLstd450Step with NaN 

NOTE: This commit needs "nir: All set-on-comparison opcodes can take all
float types" or regressions will occur in other Vulkan SPIR-V tests.

No shader-db changes on any Intel platform.

NOTE: This commit depends on "nir: All set-on-comparison opcodes can
take all float types".

v2: Fix handling 16-bit (and presumably 64-bit) values.

About 280 shaders in Talos are hurt by a few instructions, and a couple
shaders in Doom 2016 are hurt by a few instructions.

Tiger Lake
Instructions in all programs: 159893290 -> 159895026 (+0.0%)
SENDs in all programs: 6936431 -> 6936431 (+0.0%)
Loops in all programs: 38385 -> 38385 (+0.0%)
Cycles in all programs: 7019260087 -> 7019254134 (-0.0%)
Spills in all programs: 101389 -> 101389 (+0.0%)
Fills in all programs: 131532 -> 131532 (+0.0%)

Ice Lake
Instructions in all programs: 143624235 -> 143625691 (+0.0%)
SENDs in all programs: 6980289 -> 6980289 (+0.0%)
Loops in all programs: 38383 -> 38383 (+0.0%)
Cycles in all programs: 8440083238 -> 8440090702 (+0.0%)
Spills in all programs: 102246 -> 102246 (+0.0%)
Fills in all programs: 131908 -> 131908 (+0.0%)

Skylake
Instructions in all programs: 134185495 -> 134186618 (+0.0%)
SENDs in all programs: 6938790 -> 6938790 (+0.0%)
Loops in all programs: 38356 -> 38356 (+0.0%)
Cycles in all programs: 8222366923 -> 8222365826 (-0.0%)
Spills in all programs: 98821 -> 98821 (+0.0%)
Fills in all programs: 125218 -> 125218 (+0.0%)

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Fixes: 1feeee9cf4 ("nir/spirv: Add initial support for GLSL 4.50 builtins")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13999>
This commit is contained in:
Ian Romanick 2021-10-28 17:33:02 -07:00 committed by Marge Bot
parent 38a94c82e6
commit 75ef5991f5
1 changed files with 21 additions and 2 deletions
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23
src/compiler/spirv/vtn_glsl450.c
View File

@ -352,9 +352,28 @@ handle_glsl450_alu(struct vtn_builder *b, enum GLSLstd450 entrypoint,
break;
}
case GLSLstd450Step:
dest->def = nir_sge(nb, src[1], src[0]);
case GLSLstd450Step: {
/* The SPIR-V Extended Instructions for GLSL spec says:
*
* Result is 0.0 if x < edge; otherwise result is 1.0.
*
* Here src[1] is x, and src[0] is edge. The direct implementation is
*
* bcsel(src[1] < src[0], 0.0, 1.0)
*
* This is effectively b2f(!(src1 < src0)). Previously this was
* implemented using sge(src1, src0), but that produces incorrect
* results for NaN. Instead, we use the identity b2f(!x) = 1 - b2f(x).
*/
const bool exact = nb->exact;
nb->exact = true;
nir_ssa_def *cmp = nir_slt(nb, src[1], src[0]);
nb->exact = exact;
dest->def = nir_fsub(nb, nir_imm_floatN_t(nb, 1.0f, cmp->bit_size), cmp);
break;
}
case GLSLstd450Length:
dest->def = nir_fast_length(nb, src[0]);