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MemCpyOpt: When merging memsets also merge the trivial case of two memsets with the same destination.
The testcase is from PR19092, but I think the bug described there is actually a clang issue. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203489 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -75,6 +75,13 @@ static bool IsPointerOffset(Value *Ptr1, Value *Ptr2, int64_t &Offset,
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const DataLayout &TD) {
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Ptr1 = Ptr1->stripPointerCasts();
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Ptr2 = Ptr2->stripPointerCasts();
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// Handle the trivial case first.
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if (Ptr1 == Ptr2) {
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Offset = 0;
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return true;
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}
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GEPOperator *GEP1 = dyn_cast<GEPOperator>(Ptr1);
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GEPOperator *GEP2 = dyn_cast<GEPOperator>(Ptr2);
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@ -272,3 +272,15 @@ define void @test9() nounwind {
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; CHECK-LABEL: @test9(
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; CHECK: call void @llvm.memset.p0i8.i64(i8* bitcast ([16 x i64]* @test9buf to i8*), i8 -1, i64 16, i32 16, i1 false)
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}
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; PR19092
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define void @test10(i8* nocapture %P) nounwind {
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tail call void @llvm.memset.p0i8.i64(i8* %P, i8 0, i64 42, i32 1, i1 false)
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tail call void @llvm.memset.p0i8.i64(i8* %P, i8 0, i64 23, i32 1, i1 false)
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ret void
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; CHECK-LABEL: @test10(
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; CHECK-NOT: memset
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; CHECK: call void @llvm.memset.p0i8.i64(i8* %P, i8 0, i64 42, i32 1, i1 false)
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; CHECK-NOT: memset
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; CHECK: ret void
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}
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