1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -S -memcpyopt < %s -enable-memcpyopt-memoryssa=0 | FileCheck %s --check-prefixes=CHECK,NO_MSSA 3; RUN: opt -S -memcpyopt < %s -enable-memcpyopt-memoryssa=1 -verify-memoryssa | FileCheck %s --check-prefixes=CHECK,MSSA 4 5; PR40118: BasicAA didn't realize that stackrestore ends the lifetime of 6; unescaped dynamic allocas, such as those that might come from inalloca. 7 8source_filename = "t.cpp" 9target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32" 10target triple = "i686-unknown-windows-msvc19.14.26433" 11 12@str = internal constant [9 x i8] c"abcdxxxxx" 13 14 15; Test that we can propagate memcpy through an unescaped dynamic alloca across 16; a call to @external. 17 18define i32 @test_norestore(i32 %n) { 19; CHECK-LABEL: @test_norestore( 20; CHECK-NEXT: [[TMPMEM:%.*]] = alloca [10 x i8], align 4 21; CHECK-NEXT: [[TMP:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[TMPMEM]], i32 0, i32 0 22; CHECK-NEXT: [[P:%.*]] = alloca i8, i32 [[N:%.*]], align 4 23; 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) 24; CHECK-NEXT: [[P10:%.*]] = getelementptr inbounds i8, i8* [[P]], i32 9 25; CHECK-NEXT: store i8 0, i8* [[P10]], align 1 26; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[TMP]], i8* [[P]], i32 10, i1 false) 27; CHECK-NEXT: call void @external() 28; CHECK-NEXT: [[HEAP:%.*]] = call i8* @malloc(i32 9) 29; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[HEAP]], i8* [[P]], i32 9, i1 false) 30; CHECK-NEXT: call void @useit(i8* [[HEAP]]) 31; CHECK-NEXT: ret i32 0 32; 33 %tmpmem = alloca [10 x i8], align 4 34 %tmp = getelementptr inbounds [10 x i8], [10 x i8]* %tmpmem, i32 0, i32 0 35 36 ; Make a dynamic alloca, initialize it. 37 %p = alloca i8, i32 %n, align 4 38 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) 39 40 ; This extra byte exists to prevent memcpyopt from propagating @str. 41 %p10 = getelementptr inbounds i8, i8* %p, i32 9 42 store i8 0, i8* %p10 43 44 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* %p, i32 10, i1 false) 45 call void @external() 46 %heap = call i8* @malloc(i32 9) 47 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %heap, i8* %tmp, i32 9, i1 false) 48 call void @useit(i8* %heap) 49 ret i32 0 50} 51 52; Do not propagate memcpy from %p across the stackrestore. 53 54define i32 @test_stackrestore() { 55; CHECK-LABEL: @test_stackrestore( 56; CHECK-NEXT: [[TMPMEM:%.*]] = alloca [10 x i8], align 4 57; CHECK-NEXT: [[TMP:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[TMPMEM]], i32 0, i32 0 58; CHECK-NEXT: [[INALLOCA_SAVE:%.*]] = tail call i8* @llvm.stacksave() 59; CHECK-NEXT: [[ARGMEM:%.*]] = alloca inalloca [10 x i8], align 4 60; CHECK-NEXT: [[P:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[ARGMEM]], i32 0, i32 0 61; 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) 62; CHECK-NEXT: [[P10:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[ARGMEM]], i32 0, i32 9 63; CHECK-NEXT: store i8 0, i8* [[P10]], align 1 64; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[TMP]], i8* [[P]], i32 10, i1 false) 65; CHECK-NEXT: call void @llvm.stackrestore(i8* [[INALLOCA_SAVE]]) 66; CHECK-NEXT: [[HEAP:%.*]] = call i8* @malloc(i32 9) 67; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[HEAP]], i8* [[TMP]], i32 9, i1 false) 68; CHECK-NEXT: call void @useit(i8* [[HEAP]]) 69; CHECK-NEXT: ret i32 0 70; 71 %tmpmem = alloca [10 x i8], align 4 72 %tmp = getelementptr inbounds [10 x i8], [10 x i8]* %tmpmem, i32 0, i32 0 73 %inalloca.save = tail call i8* @llvm.stacksave() 74 %argmem = alloca inalloca [10 x i8], align 4 75 %p = getelementptr inbounds [10 x i8], [10 x i8]* %argmem, i32 0, i32 0 76 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) 77 78 ; This extra byte exists to prevent memcpyopt from propagating @str. 79 %p10 = getelementptr inbounds [10 x i8], [10 x i8]* %argmem, i32 0, i32 9 80 store i8 0, i8* %p10 81 82 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* %p, i32 10, i1 false) 83 call void @llvm.stackrestore(i8* %inalloca.save) 84 %heap = call i8* @malloc(i32 9) 85 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %heap, i8* %tmp, i32 9, i1 false) 86 call void @useit(i8* %heap) 87 ret i32 0 88} 89 90declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture writeonly, i8* nocapture readonly, i32, i1) 91declare i8* @llvm.stacksave() 92declare void @llvm.stackrestore(i8*) 93declare i8* @malloc(i32) 94declare void @useit(i8*) 95declare void @external() 96