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lima/gpir: add better lowering for ftrunc

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GP doesn't support ftrunc natively and unfortunately one in generic
opt_algebraic is not GP-friendly either. Introduce our own lowering
that utilizes fsign() that GP supports:
ftrunc(a) = fmul(fsign(a), ffloor(fmax(a, -a)))

Tested-by: Andreas Baierl <ichgeh@imkreisrum.de>
Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4126>
This commit is contained in:
Vasily Khoruzhick
2020-03-10 01:30:14 -07:00
parent b7d89476f1
commit 2756b62917
4 changed files with 11 additions and 106 deletions
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12
src/gallium/drivers/lima/lima_program.c
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@@ -49,7 +49,6 @@ static const nir_shader_compiler_options vs_nir_options = {
.lower_sub = true,
.lower_flrp32 = true,
.lower_flrp64 = true,
.lower_ftrunc = true,
/* could be implemented by clamp */
.lower_fsat = true,
.lower_bitops = true,
@@ -123,6 +122,7 @@ lima_program_optimize_vs_nir(struct nir_shader *s)
NIR_PASS(progress, s, nir_opt_cse);
NIR_PASS(progress, s, nir_opt_peephole_select, 8, true, true);
NIR_PASS(progress, s, nir_opt_algebraic);
NIR_PASS(progress, s, lima_nir_lower_ftrunc);
NIR_PASS(progress, s, nir_opt_constant_folding);
NIR_PASS(progress, s, nir_opt_undef);
NIR_PASS(progress, s, nir_opt_loop_unroll,
@@ -132,14 +132,8 @@ lima_program_optimize_vs_nir(struct nir_shader *s)
} while (progress);
NIR_PASS_V(s, nir_lower_int_to_float);
/* Run opt_algebraic between int_to_float and bool_to_float because
* int_to_float emits ftrunc, and ftrunc lowering generates bool ops
*/
do {
progress = false;
NIR_PASS(progress, s, nir_opt_algebraic);
} while (progress);
/* int_to_float pass generates ftrunc, so lower it */
NIR_PASS(progress, s, lima_nir_lower_ftrunc);
NIR_PASS_V(s, nir_lower_bool_to_float);
NIR_PASS_V(s, nir_copy_prop);