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[MemCpyOpt] Support opaque pointers

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This commit is contained in:
Nikita Popov 2021-06-27 15:52:24 +02:00
parent e3cd3226a4
commit d5928b4916
3 changed files with 19 additions and 3 deletions
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2
lib/IR/IRBuilder.cpp
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@ -62,7 +62,7 @@ Type *IRBuilderBase::getCurrentFunctionReturnType() const {
Value *IRBuilderBase::getCastedInt8PtrValue(Value *Ptr) { Value *IRBuilderBase::getCastedInt8PtrValue(Value *Ptr) {
auto *PT = cast<PointerType>(Ptr->getType()); auto *PT = cast<PointerType>(Ptr->getType());
if (PT->getElementType()->isIntegerTy(8)) if (PT->isOpaqueOrPointeeTypeMatches(getInt8Ty()))
return Ptr; return Ptr;
// Otherwise, we need to insert a bitcast. // Otherwise, we need to insert a bitcast.

3
lib/Transforms/Scalar/MemCpyOptimizer.cpp
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@ -1215,8 +1215,7 @@ bool MemCpyOptPass::processMemSetMemCpyDependence(MemCpyInst *MemCpy,
Value *MemsetLen = Builder.CreateSelect( Value *MemsetLen = Builder.CreateSelect(
Ule, ConstantInt::getNullValue(DestSize->getType()), SizeDiff); Ule, ConstantInt::getNullValue(DestSize->getType()), SizeDiff);
Instruction *NewMemSet = Builder.CreateMemSet( Instruction *NewMemSet = Builder.CreateMemSet(
Builder.CreateGEP(Dest->getType()->getPointerElementType(), Dest, Builder.CreateGEP(Builder.getInt8Ty(), Dest, SrcSize),
SrcSize),
MemSet->getOperand(1), MemsetLen, MaybeAlign(Align)); MemSet->getOperand(1), MemsetLen, MaybeAlign(Align));
if (MSSAU) { if (MSSAU) {

17
test/Transforms/MemCpyOpt/memset-memcpy-redundant-memset.ll
View File

@ -291,10 +291,27 @@ define void @test_must_alias_different_size(i8* noalias %src, i64 %src_size, i8*
ret void ret void
} }
define void @test_opaque_ptrs(ptr %src, i64 %src_size, ptr noalias %dst, i64 %dst_size, i8 %c) {
; CHECK-LABEL: @test_opaque_ptrs(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i64 [[DST_SIZE:%.*]], [[SRC_SIZE:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = sub i64 [[DST_SIZE]], [[SRC_SIZE]]
; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[TMP1]], i64 0, i64 [[TMP2]]
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr i8, ptr [[DST:%.*]], i64 [[SRC_SIZE]]
; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 1 [[TMP4]], i8 [[C:%.*]], i64 [[TMP3]], i1 false)
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr [[DST]], ptr [[SRC:%.*]], i64 [[SRC_SIZE]], i1 false)
; CHECK-NEXT: ret void
;
call void @llvm.memset.p0.i64(ptr %dst, i8 %c, i64 %dst_size, i1 false)
call void @llvm.memcpy.p0.p0.i64(ptr %dst, ptr %src, i64 %src_size, i1 false)
ret void
}
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1)
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i1) declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i1)
declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i1) declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i1)
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture readonly, i32, i1) declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture readonly, i32, i1)
declare void @llvm.memset.p0i8.i128(i8* nocapture, i8, i128, i1) declare void @llvm.memset.p0i8.i128(i8* nocapture, i8, i128, i1)
declare void @llvm.memcpy.p0i8.p0i8.i128(i8* nocapture, i8* nocapture readonly, i128, i1) declare void @llvm.memcpy.p0i8.p0i8.i128(i8* nocapture, i8* nocapture readonly, i128, i1)
declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i1)
declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture readonly, i64, i1)
declare void @call() declare void @call()