1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -S -passes=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: [[P:%.*]] = alloca i8, i32 [[N:%.*]], align 4 21; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[P]], ptr align 1 @str, i32 9, i1 false) 22; CHECK-NEXT: [[P10:%.*]] = getelementptr inbounds i8, ptr [[P]], i32 9 23; CHECK-NEXT: store i8 0, ptr [[P10]], align 1 24; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[TMPMEM]], ptr [[P]], i32 10, i1 false) 25; CHECK-NEXT: call void @external() 26; CHECK-NEXT: [[HEAP:%.*]] = call ptr @malloc(i32 9) 27; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[HEAP]], ptr align 1 @str, i32 9, i1 false) 28; CHECK-NEXT: call void @useit(ptr [[HEAP]]) 29; CHECK-NEXT: ret i32 0 30; 31 %tmpmem = alloca [10 x i8], align 4 32 33 ; Make a dynamic alloca, initialize it. 34 %p = alloca i8, i32 %n, align 4 35 call void @llvm.memcpy.p0.p0.i32(ptr %p, ptr align 1 @str, i32 9, i1 false) 36 37 ; This extra byte exists to prevent memcpyopt from propagating @str. 38 %p10 = getelementptr inbounds i8, ptr %p, i32 9 39 store i8 0, ptr %p10 40 41 call void @llvm.memcpy.p0.p0.i32(ptr %tmpmem, ptr %p, i32 10, i1 false) 42 call void @external() 43 %heap = call ptr @malloc(i32 9) 44 call void @llvm.memcpy.p0.p0.i32(ptr %heap, ptr %tmpmem, i32 9, i1 false) 45 call void @useit(ptr %heap) 46 ret i32 0 47} 48 49; Do not propagate memcpy from %p across the stackrestore. 50 51define i32 @test_stackrestore() { 52; CHECK-LABEL: @test_stackrestore( 53; CHECK-NEXT: [[TMPMEM:%.*]] = alloca [10 x i8], align 4 54; CHECK-NEXT: [[INALLOCA_SAVE:%.*]] = tail call ptr @llvm.stacksave.p0() 55; CHECK-NEXT: [[ARGMEM:%.*]] = alloca inalloca [10 x i8], align 4 56; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[ARGMEM]], ptr align 1 @str, i32 9, i1 false) 57; CHECK-NEXT: [[P10:%.*]] = getelementptr inbounds [10 x i8], ptr [[ARGMEM]], i32 0, i32 9 58; CHECK-NEXT: store i8 0, ptr [[P10]], align 1 59; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[TMPMEM]], ptr [[ARGMEM]], i32 10, i1 false) 60; CHECK-NEXT: call void @llvm.stackrestore.p0(ptr [[INALLOCA_SAVE]]) 61; CHECK-NEXT: [[HEAP:%.*]] = call ptr @malloc(i32 9) 62; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[HEAP]], ptr [[TMPMEM]], i32 9, i1 false) 63; CHECK-NEXT: call void @useit(ptr [[HEAP]]) 64; CHECK-NEXT: ret i32 0 65; 66 %tmpmem = alloca [10 x i8], align 4 67 %inalloca.save = tail call ptr @llvm.stacksave() 68 %argmem = alloca inalloca [10 x i8], align 4 69 call void @llvm.memcpy.p0.p0.i32(ptr %argmem, ptr align 1 @str, i32 9, i1 false) 70 71 ; This extra byte exists to prevent memcpyopt from propagating @str. 72 %p10 = getelementptr inbounds [10 x i8], ptr %argmem, i32 0, i32 9 73 store i8 0, ptr %p10 74 75 call void @llvm.memcpy.p0.p0.i32(ptr %tmpmem, ptr %argmem, i32 10, i1 false) 76 call void @llvm.stackrestore(ptr %inalloca.save) 77 %heap = call ptr @malloc(i32 9) 78 call void @llvm.memcpy.p0.p0.i32(ptr %heap, ptr %tmpmem, i32 9, i1 false) 79 call void @useit(ptr %heap) 80 ret i32 0 81} 82 83declare void @llvm.memcpy.p0.p0.i32(ptr nocapture writeonly, ptr nocapture readonly, i32, i1) 84declare ptr @llvm.stacksave() 85declare void @llvm.stackrestore(ptr) 86declare ptr @malloc(i32) 87declare void @useit(ptr) 88declare void @external() 89