1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -S -memcpyopt < %s -verify-memoryssa | FileCheck %s 3 4; PR40118: BasicAA didn't realize that stackrestore ends the lifetime of 5; unescaped dynamic allocas, such as those that might come from inalloca. 6 7source_filename = "t.cpp" 8target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32" 9target triple = "i686-unknown-windows-msvc19.14.26433" 10 11@str = internal constant [9 x i8] c"abcdxxxxx" 12 13 14; Test that we can propagate memcpy through an unescaped dynamic alloca across 15; a call to @external. 16 17define i32 @test_norestore(i32 %n) { 18; CHECK-LABEL: @test_norestore( 19; CHECK-NEXT: [[TMPMEM:%.*]] = alloca [10 x i8], align 4 20; CHECK-NEXT: [[TMP:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[TMPMEM]], i32 0, i32 0 21; CHECK-NEXT: [[P:%.*]] = alloca i8, i32 [[N:%.*]], align 4 22; CHECK-NEXT: 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) 23; CHECK-NEXT: [[P10:%.*]] = getelementptr inbounds i8, i8* [[P]], i32 9 24; CHECK-NEXT: store i8 0, i8* [[P10]], align 1 25; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[TMP]], i8* [[P]], i32 10, i1 false) 26; CHECK-NEXT: call void @external() 27; CHECK-NEXT: [[HEAP:%.*]] = call i8* @malloc(i32 9) 28; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[HEAP]], i8* align 1 getelementptr inbounds ([9 x i8], [9 x i8]* @str, i32 0, i32 0), i32 9, i1 false) 29; CHECK-NEXT: call void @useit(i8* [[HEAP]]) 30; CHECK-NEXT: ret i32 0 31; 32 %tmpmem = alloca [10 x i8], align 4 33 %tmp = getelementptr inbounds [10 x i8], [10 x i8]* %tmpmem, i32 0, i32 0 34 35 ; Make a dynamic alloca, initialize it. 36 %p = alloca i8, i32 %n, align 4 37 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) 38 39 ; This extra byte exists to prevent memcpyopt from propagating @str. 40 %p10 = getelementptr inbounds i8, i8* %p, i32 9 41 store i8 0, i8* %p10 42 43 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* %p, i32 10, i1 false) 44 call void @external() 45 %heap = call i8* @malloc(i32 9) 46 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %heap, i8* %tmp, i32 9, i1 false) 47 call void @useit(i8* %heap) 48 ret i32 0 49} 50 51; Do not propagate memcpy from %p across the stackrestore. 52 53define i32 @test_stackrestore() { 54; CHECK-LABEL: @test_stackrestore( 55; CHECK-NEXT: [[TMPMEM:%.*]] = alloca [10 x i8], align 4 56; CHECK-NEXT: [[TMP:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[TMPMEM]], i32 0, i32 0 57; CHECK-NEXT: [[INALLOCA_SAVE:%.*]] = tail call i8* @llvm.stacksave() 58; CHECK-NEXT: [[ARGMEM:%.*]] = alloca inalloca [10 x i8], align 4 59; CHECK-NEXT: [[P:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[ARGMEM]], i32 0, i32 0 60; CHECK-NEXT: 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) 61; CHECK-NEXT: [[P10:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[ARGMEM]], i32 0, i32 9 62; CHECK-NEXT: store i8 0, i8* [[P10]], align 1 63; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[TMP]], i8* [[P]], i32 10, i1 false) 64; CHECK-NEXT: call void @llvm.stackrestore(i8* [[INALLOCA_SAVE]]) 65; CHECK-NEXT: [[HEAP:%.*]] = call i8* @malloc(i32 9) 66; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[HEAP]], i8* [[TMP]], i32 9, i1 false) 67; CHECK-NEXT: call void @useit(i8* [[HEAP]]) 68; CHECK-NEXT: ret i32 0 69; 70 %tmpmem = alloca [10 x i8], align 4 71 %tmp = getelementptr inbounds [10 x i8], [10 x i8]* %tmpmem, i32 0, i32 0 72 %inalloca.save = tail call i8* @llvm.stacksave() 73 %argmem = alloca inalloca [10 x i8], align 4 74 %p = getelementptr inbounds [10 x i8], [10 x i8]* %argmem, i32 0, i32 0 75 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) 76 77 ; This extra byte exists to prevent memcpyopt from propagating @str. 78 %p10 = getelementptr inbounds [10 x i8], [10 x i8]* %argmem, i32 0, i32 9 79 store i8 0, i8* %p10 80 81 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* %p, i32 10, i1 false) 82 call void @llvm.stackrestore(i8* %inalloca.save) 83 %heap = call i8* @malloc(i32 9) 84 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %heap, i8* %tmp, i32 9, i1 false) 85 call void @useit(i8* %heap) 86 ret i32 0 87} 88 89declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture writeonly, i8* nocapture readonly, i32, i1) 90declare i8* @llvm.stacksave() 91declare void @llvm.stackrestore(i8*) 92declare i8* @malloc(i32) 93declare void @useit(i8*) 94declare void @external() 95