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[MergedLoadStore] Preserve common metadata when sinking stores. #116382

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Merged
merged 3 commits into from
Nov 15, 2024
Merged

[MergedLoadStore] Preserve common metadata when sinking stores. #116382

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62332e9
[MergedLoadStore] Preserve common metadata when sinking stores.
fhahn Nov 15, 2024
b68c580
!fixup use combineMetadataForCSE.
fhahn Nov 15, 2024
5653a5c
!fixup remove FIXME
fhahn Nov 15, 2024
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4 changes: 3 additions & 1 deletion llvm/lib/Transforms/Scalar/MergedLoadStoreMotion.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,7 @@
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/Local.h"

using namespace llvm;

Expand Down Expand Up @@ -255,7 +256,8 @@ void MergedLoadStoreMotion::sinkStoresAndGEPs(BasicBlock *BB, StoreInst *S0,
BasicBlock::iterator InsertPt = BB->getFirstInsertionPt();
// Intersect optional metadata.
S0->andIRFlags(S1);
S0->dropUnknownNonDebugMetadata();

combineMetadataForCSE(S0, S1, true);
S0->applyMergedLocation(S0->getDebugLoc(), S1->getDebugLoc());
S0->mergeDIAssignID(S1);

Expand Down
15 changes: 10 additions & 5 deletions llvm/test/Transforms/MergedLoadStoreMotion/preserve-store-metadata.ll
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Expand Up @@ -3,7 +3,6 @@

target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-n32:64-S128-Fn32"

; FIXME: Can preserve common metadata on the sunk store.
define void @perserve_common_metadata(i1 %c, ptr %dst, ptr %min) {
; CHECK-LABEL: define void @perserve_common_metadata(
; CHECK-SAME: i1 [[C:%.*]], ptr [[DST:%.*]], ptr [[MIN:%.*]]) {
Expand All @@ -19,7 +18,7 @@ define void @perserve_common_metadata(i1 %c, ptr %dst, ptr %min) {
; CHECK-NEXT: br label %[[RETURN]]
; CHECK: [[RETURN]]:
; CHECK-NEXT: [[DOTSINK:%.*]] = phi ptr [ [[DST]], %[[THEN]] ], [ null, %[[ELSE]] ]
; CHECK-NEXT: store ptr [[DOTSINK]], ptr [[GEP_DST_16]], align 8
; CHECK-NEXT: store ptr [[DOTSINK]], ptr [[GEP_DST_16]], align 8, !tbaa [[TBAA4:![0-9]+]], !alias.scope [[META6:![0-9]+]], !noalias [[META6]], !llvm.access.group [[ACC_GRP9:![0-9]+]]
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@nikic nikic Nov 15, 2024

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Remove FIXME above.

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@fhahn fhahn Nov 15, 2024

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Done, thanks!

; CHECK-NEXT: ret void
;
entry:
Expand Down Expand Up @@ -48,7 +47,7 @@ define void @clear_different_metadata(i1 %c, ptr %dst, ptr %min) {
; CHECK-NEXT: [[GEP_DST_16:%.*]] = getelementptr inbounds nuw i8, ptr [[DST]], i64 16
; CHECK-NEXT: br i1 [[C]], label %[[THEN:.*]], label %[[ELSE:.*]]
; CHECK: [[THEN]]:
; CHECK-NEXT: store ptr [[DST]], ptr [[MIN]], align 8, !tbaa [[TBAA4:![0-9]+]]
; CHECK-NEXT: store ptr [[DST]], ptr [[MIN]], align 8, !tbaa [[TBAA10:![0-9]+]]
; CHECK-NEXT: br label %[[RETURN:.*]]
; CHECK: [[ELSE]]:
; CHECK-NEXT: [[GEP_DST_24:%.*]] = getelementptr inbounds nuw i8, ptr [[DST]], i64 24
Expand Down Expand Up @@ -99,6 +98,12 @@ return:
; CHECK: [[META2]] = !{!"omnipotent char", [[META3:![0-9]+]], i64 0}
; CHECK: [[META3]] = !{!"Simple C++ TBAA"}
; CHECK: [[TBAA4]] = !{[[META5:![0-9]+]], [[META5]], i64 0, i64 0}
; CHECK: [[META5]] = !{!"p2 _Foo", [[META6:![0-9]+]]}
; CHECK: [[META6]] = !{!"any pointer", [[META2]], i64 0}
; CHECK: [[META5]] = !{!"long", [[META2]]}
; CHECK: [[META6]] = !{[[META7:![0-9]+]]}
; CHECK: [[META7]] = distinct !{[[META7]], [[META8:![0-9]+]]}
; CHECK: [[META8]] = distinct !{[[META8]]}
; CHECK: [[ACC_GRP9]] = distinct !{}
; CHECK: [[TBAA10]] = !{[[META11:![0-9]+]], [[META11]], i64 0, i64 0}
; CHECK: [[META11]] = !{!"p2 _Foo", [[META12:![0-9]+]]}
; CHECK: [[META12]] = !{!"any pointer", [[META2]], i64 0}
;.
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