mirror of
https://gitlab.freedesktop.org/mesa/mesa.git
synced 2025-12-24 06:40:11 +01:00
d1eb17e92e
Via Coccinelle patch:
@@
expression b, s, n;
@@
-nir_ssa_for_src(b, *s, n)
+s->ssa
@@
expression b, s, n;
@@
-nir_ssa_for_src(b, s, n)
+s.ssa
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25247>
124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/*
|
|
* Copyright 2018 Collabora Ltd.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* on the rights to use, copy, modify, merge, publish, distribute, sub
|
|
* license, and/or sell copies of the Software, and to permit persons to whom
|
|
* the Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the next
|
|
* paragraph) shall be included in all copies or substantial portions of the
|
|
* Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
|
|
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
|
|
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
|
|
* USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
#include "compiler/nir/nir_builder.h"
|
|
#include "nir.h"
|
|
|
|
static bool
|
|
lower_discard_if(nir_builder *b, nir_intrinsic_instr *instr, void *cb_data)
|
|
{
|
|
nir_lower_discard_if_options options = *(nir_lower_discard_if_options *)cb_data;
|
|
|
|
switch (instr->intrinsic) {
|
|
case nir_intrinsic_discard_if:
|
|
if (!(options & nir_lower_discard_if_to_cf))
|
|
return false;
|
|
break;
|
|
case nir_intrinsic_demote_if:
|
|
if (!(options & nir_lower_demote_if_to_cf))
|
|
return false;
|
|
break;
|
|
case nir_intrinsic_terminate_if:
|
|
if (!(options & nir_lower_terminate_if_to_cf))
|
|
return false;
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
b->cursor = nir_before_instr(&instr->instr);
|
|
|
|
nir_if *if_stmt = nir_push_if(b, instr->src[0].ssa);
|
|
switch (instr->intrinsic) {
|
|
case nir_intrinsic_discard_if:
|
|
nir_discard(b);
|
|
break;
|
|
case nir_intrinsic_demote_if:
|
|
nir_demote(b);
|
|
break;
|
|
case nir_intrinsic_terminate_if:
|
|
nir_terminate(b);
|
|
break;
|
|
default:
|
|
unreachable("bad intrinsic");
|
|
}
|
|
nir_pop_if(b, if_stmt);
|
|
nir_instr_remove(&instr->instr);
|
|
return true;
|
|
|
|
/* a shader like this (shaders@glsl-fs-discard-04):
|
|
|
|
uniform int j, k;
|
|
|
|
void main()
|
|
{
|
|
for (int i = 0; i < j; i++) {
|
|
if (i > k)
|
|
continue;
|
|
discard;
|
|
}
|
|
gl_FragColor = vec4(0.0, 1.0, 0.0, 0.0);
|
|
}
|
|
|
|
|
|
|
|
will generate nir like:
|
|
|
|
loop {
|
|
//snip
|
|
if ssa_11 {
|
|
block block_5:
|
|
/ preds: block_4 /
|
|
vec1 32 ssa_17 = iadd ssa_50, ssa_31
|
|
/ succs: block_7 /
|
|
} else {
|
|
block block_6:
|
|
/ preds: block_4 /
|
|
intrinsic discard () () <-- not last instruction
|
|
vec1 32 ssa_23 = iadd ssa_50, ssa_31 <-- dead code loop itr increment
|
|
/ succs: block_7 /
|
|
}
|
|
//snip
|
|
}
|
|
|
|
which means that we can't assert like this:
|
|
|
|
assert(instr->intrinsic != nir_intrinsic_discard ||
|
|
nir_block_last_instr(instr->instr.block) == &instr->instr);
|
|
|
|
|
|
and it's unnecessary anyway since later optimizations will dce the
|
|
instructions following the discard
|
|
*/
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
nir_lower_discard_if(nir_shader *shader, nir_lower_discard_if_options options)
|
|
{
|
|
return nir_shader_intrinsics_pass(shader,
|
|
lower_discard_if,
|
|
nir_metadata_none,
|
|
&options);
|
|
}
|