forked from OSchip/llvm-project
26 lines
687 B
LLVM
26 lines
687 B
LLVM
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; RUN: opt -S -instcombine %s -o - | FileCheck %s
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; Regression test of PR31990. A memcpy of one byte, copying 0xff, was
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; replaced with a single store of an i4 0xf.
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@g = constant i8 -1
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define void @foo() {
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entry:
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%0 = alloca i8
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%1 = bitcast i8* %0 to i4*
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call void @bar(i4* %1)
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%2 = bitcast i4* %1 to i8*
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %2, i8* @g, i32 1, i1 false)
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call void @gaz(i8* %2)
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ret void
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}
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture writeonly, i8* nocapture readonly, i32, i1)
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declare void @bar(i4*)
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declare void @gaz(i8*)
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; The mempcy should be simplified to a single store of an i8, not i4
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; CHECK: store i8 -1
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; CHECK-NOT: store i4 -1
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