[llvm] [MachineScheduler] Add option to control reordering for store/load clustering (PR #75338)
Alex Bradbury via llvm-commits
llvm-commits at lists.llvm.org
Thu Jan 4 07:46:50 PST 2024
https://github.com/asb updated https://github.com/llvm/llvm-project/pull/75338
>From 037f49eab2bb4d92629cfb42586d51c9ca1dd473 Mon Sep 17 00:00:00 2001
From: Alex Bradbury <asb at igalia.com>
Date: Wed, 13 Dec 2023 13:32:13 +0000
Subject: [PATCH 1/2] [MachineScheduler] Add option to control reordering for
store/load clustering
Reordering based on the sort order of the MemOpInfo array was disabled
in <https://reviews.llvm.org/D72706>. However, it's not clear this is
desirable for al targets. It also makes it more difficult to compare the
incremental benefit of enabling load clustering in the selectiondag
scheduler as well was the machinescheduler, as the sdag scheduler does
seem to allow this reordering.
This patch adds a parameter that can control the behaviour on a
per-target basis.
---
llvm/include/llvm/CodeGen/MachineScheduler.h | 10 ++++--
llvm/lib/CodeGen/MachineScheduler.cpp | 31 ++++++++++++-------
llvm/lib/Target/RISCV/RISCVTargetMachine.cpp | 2 +-
.../CodeGen/RISCV/misched-load-clustering.ll | 6 ++--
4 files changed, 32 insertions(+), 17 deletions(-)
diff --git a/llvm/include/llvm/CodeGen/MachineScheduler.h b/llvm/include/llvm/CodeGen/MachineScheduler.h
index 9f16cf5d5bc387..47127a6c29603b 100644
--- a/llvm/include/llvm/CodeGen/MachineScheduler.h
+++ b/llvm/include/llvm/CodeGen/MachineScheduler.h
@@ -1347,13 +1347,19 @@ ScheduleDAGMILive *createGenericSchedLive(MachineSchedContext *C);
/// Create a generic scheduler with no vreg liveness or DAG mutation passes.
ScheduleDAGMI *createGenericSchedPostRA(MachineSchedContext *C);
+/// If ReorderWhileClustering is set to true, no attempt will be made to
+/// reduce reordering due to store clustering.
std::unique_ptr<ScheduleDAGMutation>
createLoadClusterDAGMutation(const TargetInstrInfo *TII,
- const TargetRegisterInfo *TRI);
+ const TargetRegisterInfo *TRI,
+ bool ReorderWhileClustering = false);
+/// If ReorderWhileClustering is set to true, no attempt will be made to
+/// reduce reordering due to store clustering.
std::unique_ptr<ScheduleDAGMutation>
createStoreClusterDAGMutation(const TargetInstrInfo *TII,
- const TargetRegisterInfo *TRI);
+ const TargetRegisterInfo *TRI,
+ bool ReorderWhileClustering = false);
std::unique_ptr<ScheduleDAGMutation>
createCopyConstrainDAGMutation(const TargetInstrInfo *TII,
diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index 886137d86f87de..554776783eff6f 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -1743,11 +1743,14 @@ class BaseMemOpClusterMutation : public ScheduleDAGMutation {
const TargetInstrInfo *TII;
const TargetRegisterInfo *TRI;
bool IsLoad;
+ bool ReorderWhileClustering;
public:
BaseMemOpClusterMutation(const TargetInstrInfo *tii,
- const TargetRegisterInfo *tri, bool IsLoad)
- : TII(tii), TRI(tri), IsLoad(IsLoad) {}
+ const TargetRegisterInfo *tri, bool IsLoad,
+ bool ReorderWhileClustering)
+ : TII(tii), TRI(tri), IsLoad(IsLoad),
+ ReorderWhileClustering(ReorderWhileClustering) {}
void apply(ScheduleDAGInstrs *DAGInstrs) override;
@@ -1763,14 +1766,16 @@ class BaseMemOpClusterMutation : public ScheduleDAGMutation {
class StoreClusterMutation : public BaseMemOpClusterMutation {
public:
StoreClusterMutation(const TargetInstrInfo *tii,
- const TargetRegisterInfo *tri)
- : BaseMemOpClusterMutation(tii, tri, false) {}
+ const TargetRegisterInfo *tri,
+ bool ReorderWhileClustering)
+ : BaseMemOpClusterMutation(tii, tri, false, ReorderWhileClustering) {}
};
class LoadClusterMutation : public BaseMemOpClusterMutation {
public:
- LoadClusterMutation(const TargetInstrInfo *tii, const TargetRegisterInfo *tri)
- : BaseMemOpClusterMutation(tii, tri, true) {}
+ LoadClusterMutation(const TargetInstrInfo *tii, const TargetRegisterInfo *tri,
+ bool ReorderWhileClustering)
+ : BaseMemOpClusterMutation(tii, tri, true, ReorderWhileClustering) {}
};
} // end anonymous namespace
@@ -1779,15 +1784,19 @@ namespace llvm {
std::unique_ptr<ScheduleDAGMutation>
createLoadClusterDAGMutation(const TargetInstrInfo *TII,
- const TargetRegisterInfo *TRI) {
- return EnableMemOpCluster ? std::make_unique<LoadClusterMutation>(TII, TRI)
+ const TargetRegisterInfo *TRI,
+ bool ReorderWhileClustering) {
+ return EnableMemOpCluster ? std::make_unique<LoadClusterMutation>(
+ TII, TRI, ReorderWhileClustering)
: nullptr;
}
std::unique_ptr<ScheduleDAGMutation>
createStoreClusterDAGMutation(const TargetInstrInfo *TII,
- const TargetRegisterInfo *TRI) {
- return EnableMemOpCluster ? std::make_unique<StoreClusterMutation>(TII, TRI)
+ const TargetRegisterInfo *TRI,
+ bool ReorderWhileClustering) {
+ return EnableMemOpCluster ? std::make_unique<StoreClusterMutation>(
+ TII, TRI, ReorderWhileClustering)
: nullptr;
}
@@ -1840,7 +1849,7 @@ void BaseMemOpClusterMutation::clusterNeighboringMemOps(
SUnit *SUa = MemOpa.SU;
SUnit *SUb = MemOpb.SU;
- if (SUa->NodeNum > SUb->NodeNum)
+ if (!ReorderWhileClustering && SUa->NodeNum > SUb->NodeNum)
std::swap(SUa, SUb);
// FIXME: Is this check really required?
diff --git a/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp b/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
index 3abdb6003659fa..ae10a72e889239 100644
--- a/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
+++ b/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
@@ -348,7 +348,7 @@ class RISCVPassConfig : public TargetPassConfig {
ScheduleDAGMILive *DAG = nullptr;
if (EnableMISchedLoadClustering) {
DAG = createGenericSchedLive(C);
- DAG->addMutation(createLoadClusterDAGMutation(DAG->TII, DAG->TRI));
+ DAG->addMutation(createLoadClusterDAGMutation(DAG->TII, DAG->TRI, true));
}
if (ST.hasMacroFusion()) {
DAG = DAG ? DAG : createGenericSchedLive(C);
diff --git a/llvm/test/CodeGen/RISCV/misched-load-clustering.ll b/llvm/test/CodeGen/RISCV/misched-load-clustering.ll
index 4eb969a357a9ee..d046aaf98f5edd 100644
--- a/llvm/test/CodeGen/RISCV/misched-load-clustering.ll
+++ b/llvm/test/CodeGen/RISCV/misched-load-clustering.ll
@@ -23,10 +23,10 @@ define i32 @load_clustering_1(ptr nocapture %p) {
; LDCLUSTER: ********** MI Scheduling **********
; LDCLUSTER-LABEL: load_clustering_1:%bb.0
; LDCLUSTER: *** Final schedule for %bb.0 ***
-; LDCLUSTER: SU(5): %6:gpr = LW %0:gpr, 16
-; LDCLUSTER: SU(1): %1:gpr = LW %0:gpr, 12
-; LDCLUSTER: SU(2): %2:gpr = LW %0:gpr, 8
; LDCLUSTER: SU(4): %4:gpr = LW %0:gpr, 4
+; LDCLUSTER: SU(2): %2:gpr = LW %0:gpr, 8
+; LDCLUSTER: SU(1): %1:gpr = LW %0:gpr, 12
+; LDCLUSTER: SU(5): %6:gpr = LW %0:gpr, 16
entry:
%arrayidx0 = getelementptr inbounds i32, ptr %p, i32 3
%val0 = load i32, i32* %arrayidx0
>From 7e11d11bb057d58b6cdca0c859a807f0b0212020 Mon Sep 17 00:00:00 2001
From: Alex Bradbury <asb at igalia.com>
Date: Thu, 4 Jan 2024 15:46:36 +0000
Subject: [PATCH 2/2] Add comment for ReorderWhileClustering argument
---
llvm/lib/Target/RISCV/RISCVTargetMachine.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp b/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
index ae10a72e889239..ab316f185b0d26 100644
--- a/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
+++ b/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
@@ -348,7 +348,8 @@ class RISCVPassConfig : public TargetPassConfig {
ScheduleDAGMILive *DAG = nullptr;
if (EnableMISchedLoadClustering) {
DAG = createGenericSchedLive(C);
- DAG->addMutation(createLoadClusterDAGMutation(DAG->TII, DAG->TRI, true));
+ DAG->addMutation(createLoadClusterDAGMutation(
+ DAG->TII, DAG->TRI, /*ReorderWhileClustering=*/true));
}
if (ST.hasMacroFusion()) {
DAG = DAG ? DAG : createGenericSchedLive(C);
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