; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt -S -passes=memcpyopt < %s -verify-memoryssa | FileCheck %s ; PR40118: BasicAA didn't realize that stackrestore ends the lifetime of ; unescaped dynamic allocas, such as those that might come from inalloca. source_filename = "t.cpp" target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32" target triple = "i686-unknown-windows-msvc19.14.26433" @str = internal constant [9 x i8] c"abcdxxxxx" ; Test that we can propagate memcpy through an unescaped dynamic alloca across ; a call to @external. define i32 @test_norestore(i32 %n) { ; CHECK-LABEL: @test_norestore( ; CHECK-NEXT: [[TMPMEM:%.*]] = alloca [10 x i8], align 4 ; CHECK-NEXT: [[P:%.*]] = alloca i8, i32 [[N:%.*]], align 4 ; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[P]], ptr align 1 @str, i32 9, i1 false) ; CHECK-NEXT: [[P10:%.*]] = getelementptr inbounds i8, ptr [[P]], i32 9 ; CHECK-NEXT: store i8 0, ptr [[P10]], align 1 ; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[TMPMEM]], ptr [[P]], i32 10, i1 false) ; CHECK-NEXT: call void @external() ; CHECK-NEXT: [[HEAP:%.*]] = call ptr @malloc(i32 9) ; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[HEAP]], ptr align 1 @str, i32 9, i1 false) ; CHECK-NEXT: call void @useit(ptr [[HEAP]]) ; CHECK-NEXT: ret i32 0 ; %tmpmem = alloca [10 x i8], align 4 ; Make a dynamic alloca, initialize it. %p = alloca i8, i32 %n, align 4 call void @llvm.memcpy.p0.p0.i32(ptr %p, ptr align 1 @str, i32 9, i1 false) ; This extra byte exists to prevent memcpyopt from propagating @str. %p10 = getelementptr inbounds i8, ptr %p, i32 9 store i8 0, ptr %p10 call void @llvm.memcpy.p0.p0.i32(ptr %tmpmem, ptr %p, i32 10, i1 false) call void @external() %heap = call ptr @malloc(i32 9) call void @llvm.memcpy.p0.p0.i32(ptr %heap, ptr %tmpmem, i32 9, i1 false) call void @useit(ptr %heap) ret i32 0 } ; Do not propagate memcpy from %p across the stackrestore. define i32 @test_stackrestore() { ; CHECK-LABEL: @test_stackrestore( ; CHECK-NEXT: [[TMPMEM:%.*]] = alloca [10 x i8], align 4 ; CHECK-NEXT: [[INALLOCA_SAVE:%.*]] = tail call ptr @llvm.stacksave.p0() ; CHECK-NEXT: [[ARGMEM:%.*]] = alloca inalloca [10 x i8], align 4 ; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[ARGMEM]], ptr align 1 @str, i32 9, i1 false) ; CHECK-NEXT: [[P10:%.*]] = getelementptr inbounds [10 x i8], ptr [[ARGMEM]], i32 0, i32 9 ; CHECK-NEXT: store i8 0, ptr [[P10]], align 1 ; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[TMPMEM]], ptr [[ARGMEM]], i32 10, i1 false) ; CHECK-NEXT: call void @llvm.stackrestore.p0(ptr [[INALLOCA_SAVE]]) ; CHECK-NEXT: [[HEAP:%.*]] = call ptr @malloc(i32 9) ; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[HEAP]], ptr [[TMPMEM]], i32 9, i1 false) ; CHECK-NEXT: call void @useit(ptr [[HEAP]]) ; CHECK-NEXT: ret i32 0 ; %tmpmem = alloca [10 x i8], align 4 %inalloca.save = tail call ptr @llvm.stacksave() %argmem = alloca inalloca [10 x i8], align 4 call void @llvm.memcpy.p0.p0.i32(ptr %argmem, ptr align 1 @str, i32 9, i1 false) ; This extra byte exists to prevent memcpyopt from propagating @str. %p10 = getelementptr inbounds [10 x i8], ptr %argmem, i32 0, i32 9 store i8 0, ptr %p10 call void @llvm.memcpy.p0.p0.i32(ptr %tmpmem, ptr %argmem, i32 10, i1 false) call void @llvm.stackrestore(ptr %inalloca.save) %heap = call ptr @malloc(i32 9) call void @llvm.memcpy.p0.p0.i32(ptr %heap, ptr %tmpmem, i32 9, i1 false) call void @useit(ptr %heap) ret i32 0 } declare void @llvm.memcpy.p0.p0.i32(ptr nocapture writeonly, ptr nocapture readonly, i32, i1) declare ptr @llvm.stacksave() declare void @llvm.stackrestore(ptr) declare ptr @malloc(i32) declare void @useit(ptr) declare void @external()