forked from OSchip/llvm-project
75 lines
3.1 KiB
LLVM
75 lines
3.1 KiB
LLVM
; RUN: opt -S -memcpyopt < %s | FileCheck %s
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; PR40118: BasicAA didn't realize that stackrestore ends the lifetime of
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; unescaped dynamic allocas, such as those that might come from inalloca.
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source_filename = "t.cpp"
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "i686-unknown-windows-msvc19.14.26433"
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@str = internal constant [9 x i8] c"abcdxxxxx"
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; Test that we can propagate memcpy through an unescaped dynamic alloca across
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; a call to @external.
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define i32 @test_norestore(i32 %n) {
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%tmpmem = alloca [10 x i8], align 4
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%tmp = getelementptr inbounds [10 x i8], [10 x i8]* %tmpmem, i32 0, i32 0
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; Make a dynamic alloca, initialize it.
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%p = alloca i8, i32 %n, align 4
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %p, i8* align 1 getelementptr inbounds ([9 x i8], [9 x i8]* @str, i32 0, i32 0), i32 9, i1 false)
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; This extra byte exists to prevent memcpyopt from propagating @str.
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%p10 = getelementptr inbounds i8, i8* %p, i32 9
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store i8 0, i8* %p10
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* %p, i32 10, i1 false)
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call void @external()
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%heap = call i8* @malloc(i32 9)
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %heap, i8* %tmp, i32 9, i1 false)
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call void @useit(i8* %heap)
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ret i32 0
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}
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; CHECK-LABEL: define i32 @test_norestore(i32 %n)
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; CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %p, i8* align 1 getelementptr inbounds ([9 x i8], [9 x i8]* @str, i32 0, i32 0), i32 9, i1 false)
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; CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* %p, i32 10, i1 false)
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; CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %heap, i8* %p, i32 9, i1 false)
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; Do not propagate memcpy from %p across the stackrestore.
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define i32 @test_stackrestore() {
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%tmpmem = alloca [10 x i8], align 4
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%tmp = getelementptr inbounds [10 x i8], [10 x i8]* %tmpmem, i32 0, i32 0
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%inalloca.save = tail call i8* @llvm.stacksave()
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%argmem = alloca inalloca [10 x i8], align 4
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%p = getelementptr inbounds [10 x i8], [10 x i8]* %argmem, i32 0, i32 0
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %p, i8* align 1 getelementptr inbounds ([9 x i8], [9 x i8]* @str, i32 0, i32 0), i32 9, i1 false)
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; This extra byte exists to prevent memcpyopt from propagating @str.
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%p10 = getelementptr inbounds [10 x i8], [10 x i8]* %argmem, i32 0, i32 9
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store i8 0, i8* %p10
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* %p, i32 10, i1 false)
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call void @llvm.stackrestore(i8* %inalloca.save)
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%heap = call i8* @malloc(i32 9)
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %heap, i8* %tmp, i32 9, i1 false)
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call void @useit(i8* %heap)
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ret i32 0
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}
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; CHECK-LABEL: define i32 @test_stackrestore()
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; CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %p, i8* align 1 getelementptr inbounds ([9 x i8], [9 x i8]* @str, i32 0, i32 0), i32 9, i1 false)
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; CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* %p, i32 10, i1 false)
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; CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %heap, i8* %tmp, i32 9, i1 false)
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture writeonly, i8* nocapture readonly, i32, i1)
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declare i8* @llvm.stacksave()
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declare void @llvm.stackrestore(i8*)
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declare i8* @malloc(i32)
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declare void @useit(i8*)
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declare void @external()
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