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r300: convert x * 2 into x + x for presubtract

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total instructions in shared programs: 128859 -> 128864 (<.01%)
instructions in affected programs: 931 -> 936 (0.54%)
helped: 0
HURT: 5
total presub in shared programs: 7635 -> 7682 (0.62%)
presub in affected programs: 208 -> 255 (22.60%)
helped: 0
HURT: 17
total cycles in shared programs: 194124 -> 194101 (-0.01%)
cycles in affected programs: 1671 -> 1648 (-1.38%)
helped: 9
HURT: 1

Reviewed-by: Filip Gawin <filip.gawin@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24830>
This commit is contained in:
Pavel Ondračka
2023-08-22 16:08:01 +02:00
committed by Marge Bot
parent 0508db9155
commit 7ae3d3eb8d
2 changed files with 25 additions and 0 deletions
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21
src/gallium/drivers/r300/compiler/r300_nir.h
View File

@@ -26,6 +26,27 @@
#include "pipe/p_screen.h"
#include "compiler/nir/nir.h"
static inline bool
is_ubo_or_input(UNUSED struct hash_table *ht, const nir_alu_instr *instr,
unsigned src, unsigned num_components,
const uint8_t *swizzle)
{
nir_instr *parent = instr->src[src].src.ssa->parent_instr;
if (parent->type != nir_instr_type_intrinsic)
return false;
nir_intrinsic_instr *intrinsic = nir_instr_as_intrinsic(parent);
switch (intrinsic->intrinsic) {
case nir_intrinsic_load_ubo_vec4:
case nir_intrinsic_load_input:
case nir_intrinsic_load_interpolated_input:
return true;
default:
return false;
}
}
char *r300_finalize_nir(struct pipe_screen *pscreen, void *nir);
extern bool r300_transform_vs_trig_input(struct nir_shader *shader);

4
src/gallium/drivers/r300/compiler/r300_nir_algebraic.py
View File

@@ -76,6 +76,10 @@ r300_nir_prepare_presubtract = [
(('ffma', -2.0, a, 1.0), ('fneg', ('ffma', ('fneg', a), 2.0, 1.0))),
(('ffma', 2.0, a, -1.0), ('fneg', ('ffma', ('fneg', a), 2.0, 1.0))),
(('ffma', a, 2.0, -1.0), ('fneg', ('ffma', ('fneg', a), 2.0, 1.0))),
# x * 2 can be usually folded into output modifier for the previous
# instruction, but that only works if x is a temporary. If it is input or
# constant just convert it to add instead.
(('fmul', 'a(is_ubo_or_input)', 2.0), ('fadd', a, a)),
]
# Previous prepare_presubtract pass can sometimes produce double fneg patterns.