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[AMDGPU] Disable FillMFMAShadowMutation by default 

Disable amdgpu mfma power sched.

Reviewed By: rampitec

Differential Revision: https://reviews.llvm.org/D129172
This commit is contained in:
Austin Kerbow 2022-07-05 21:10:12 -07:00
parent bfa2c42001
commit 6817031d0b
2 changed files with 7 additions and 6 deletions
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11
llvm/lib/Target/AMDGPU/AMDGPUSubtarget.cpp
View File

@ -40,9 +40,9 @@ using namespace llvm;
#include "AMDGPUGenSubtargetInfo.inc"
#undef AMDGPUSubtarget
static cl::opt<bool> DisablePowerSched(
"amdgpu-disable-power-sched",
cl::desc("Disable scheduling to minimize mAI power bursts"),
static cl::opt<bool> EnablePowerSched(
"amdgpu-enable-power-sched",
cl::desc("Enable scheduling to minimize mAI power bursts"),
cl::init(false));
static cl::opt<bool> EnableVGPRIndexMode(
@ -916,7 +916,7 @@ struct FillMFMAShadowMutation : ScheduleDAGMutation {
void apply(ScheduleDAGInstrs *DAGInstrs) override {
const GCNSubtarget &ST = DAGInstrs->MF.getSubtarget<GCNSubtarget>();
if (!ST.hasMAIInsts() || DisablePowerSched)
if (!ST.hasMAIInsts())
return;
DAG = static_cast<ScheduleDAGMI*>(DAGInstrs);
const TargetSchedModel *TSchedModel = DAGInstrs->getSchedModel();
@ -966,7 +966,8 @@ void GCNSubtarget::getPostRAMutations(
std::unique_ptr<ScheduleDAGMutation>
GCNSubtarget::createFillMFMAShadowMutation(const TargetInstrInfo *TII) const {
return std::make_unique<FillMFMAShadowMutation>(&InstrInfo);
return EnablePowerSched ? std::make_unique<FillMFMAShadowMutation>(&InstrInfo)
: nullptr;
}
const AMDGPUSubtarget &AMDGPUSubtarget::get(const MachineFunction &MF) {

2
llvm/test/CodeGen/AMDGPU/sched-prefer-non-mfma.mir
View File

@ -1,4 +1,4 @@
# RUN: llc -march=amdgcn -mcpu=gfx908 -run-pass post-RA-sched -amdgpu-disable-power-sched -verify-machineinstrs -o - %s | FileCheck -check-prefix=GCN %s
# RUN: llc -march=amdgcn -mcpu=gfx908 -run-pass post-RA-sched -verify-machineinstrs -o - %s | FileCheck -check-prefix=GCN %s
# GCN-LABEL: name: unrelated_mfma
# GCN: V_MFMA_F32_32X32X1F32