Mesa (staging/21.2): aco: Fix how p_is_helper interacts with optimizations.
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Wed Nov 24 22:54:05 UTC 2021
Module: Mesa
Branch: staging/21.2
Commit: 40ccae25ebd2ce7dac84d559dfa60e89f8c802e0
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=40ccae25ebd2ce7dac84d559dfa60e89f8c802e0
Author: Timur Kristóf <timur.kristof at gmail.com>
Date: Thu Oct 28 15:48:19 2021 +0200
aco: Fix how p_is_helper interacts with optimizations.
p_is_helper doesn't have any operands, so ACO's value numbering and/or
the pre-RA optimizer could incorrectly recognize two such instructions
as the same.
This patch adds exec as an operand to p_is_helper in order to achieve
correct behavior.
Cc: mesa-stable
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/5570
Signed-off-by: Timur Kristóf <timur.kristof at gmail.com>
Reviewed-by: Daniel Schürmann <daniel at schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13577>
(cherry picked from commit d80c7f3406b80ae684a709de57a9ef3d54a497b6)
---
.pick_status.json | 2 +-
src/amd/compiler/aco_instruction_selection.cpp | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/.pick_status.json b/.pick_status.json
index 20734856813..88d9456b3fe 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -3190,7 +3190,7 @@
"description": "aco: Fix how p_is_helper interacts with optimizations.",
"nominated": true,
"nomination_type": 0,
- "resolution": 0,
+ "resolution": 1,
"main_sha": null,
"because_sha": null
},
diff --git a/src/amd/compiler/aco_instruction_selection.cpp b/src/amd/compiler/aco_instruction_selection.cpp
index 88c0d3657d2..3259e0123a2 100644
--- a/src/amd/compiler/aco_instruction_selection.cpp
+++ b/src/amd/compiler/aco_instruction_selection.cpp
@@ -8690,7 +8690,7 @@ visit_intrinsic(isel_context* ctx, nir_intrinsic_instr* instr)
/* load_helper() after demote() get lowered to is_helper().
* Otherwise, these two behave the same. */
Temp dst = get_ssa_temp(ctx, &instr->dest.ssa);
- bld.pseudo(aco_opcode::p_is_helper, Definition(dst));
+ bld.pseudo(aco_opcode::p_is_helper, Definition(dst), Operand(exec, bld.lm));
ctx->block->kind |= block_kind_needs_lowering;
ctx->program->needs_exact = true;
break;
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