Mesa (main): aco: make program->needs_vcc independent of VCC hints
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gitlab-mirror at kemper.freedesktop.org
Wed Apr 13 22:16:00 UTC 2022
Module: Mesa
Branch: main
Commit: b10c4d7dee1f77ec858b2621fe79fe68641857bf
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=b10c4d7dee1f77ec858b2621fe79fe68641857bf
Author: Daniel Schürmann <daniel at schuermann.dev>
Date: Wed Mar 16 10:56:26 2022 +0100
aco: make program->needs_vcc independent of VCC hints
Totals from 5 (0.00% of 135048) affected shaders: (GFX9)
SGPRs: 208 -> 160 (-23.08%)
CodeSize: 2700 -> 2692 (-0.30%)
Instrs: 533 -> 531 (-0.38%)
Latency: 41688 -> 41680 (-0.02%)
Reviewed-by: Rhys Perry <pendingchaos02 at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15408>
---
src/amd/compiler/aco_live_var_analysis.cpp | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/src/amd/compiler/aco_live_var_analysis.cpp b/src/amd/compiler/aco_live_var_analysis.cpp
index abe839642af..58a4023d787 100644
--- a/src/amd/compiler/aco_live_var_analysis.cpp
+++ b/src/amd/compiler/aco_live_var_analysis.cpp
@@ -88,6 +88,21 @@ struct PhiInfo {
uint16_t linear_phi_defs = 0;
};
+bool
+instr_needs_vcc(Instruction* instr)
+{
+ if (instr->isVOPC())
+ return true;
+ if (instr->isVOP2() && !instr->isVOP3()) {
+ if (instr->operands.size() == 3 && instr->operands[2].isTemp() &&
+ instr->operands[2].regClass().type() == RegType::sgpr)
+ return true;
+ if (instr->definitions.size() == 2)
+ return true;
+ }
+ return false;
+}
+
void
process_live_temps_per_block(Program* program, live& lives, Block* block, unsigned& worklist,
std::vector<PhiInfo>& phi_info)
@@ -111,6 +126,7 @@ process_live_temps_per_block(Program* program, live& lives, Block* block, unsign
if (is_phi(insn))
break;
+ program->needs_vcc |= instr_needs_vcc(insn);
register_demand[idx] = RegisterDemand(new_demand.vgpr, new_demand.sgpr);
/* KILL */
@@ -118,7 +134,7 @@ process_live_temps_per_block(Program* program, live& lives, Block* block, unsign
if (!definition.isTemp()) {
continue;
}
- if ((definition.isFixed() || definition.hasHint()) && definition.physReg() == vcc)
+ if (definition.isFixed() && definition.physReg() == vcc)
program->needs_vcc = true;
const Temp temp = definition.getTemp();
@@ -189,7 +205,7 @@ process_live_temps_per_block(Program* program, live& lives, Block* block, unsign
continue;
}
Definition& definition = insn->definitions[0];
- if ((definition.isFixed() || definition.hasHint()) && definition.physReg() == vcc)
+ if (definition.isFixed() && definition.physReg() == vcc)
program->needs_vcc = true;
const Temp temp = definition.getTemp();
const size_t n = live.erase(temp.id());
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