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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt -S -passes=memcpyopt < %s -verify-memoryssa | FileCheck %s3 4; PR40118: BasicAA didn't realize that stackrestore ends the lifetime of5; 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 across15; 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 420; CHECK-NEXT: [[P:%.*]] = alloca i8, i32 [[N:%.*]], align 421; 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 923; CHECK-NEXT: store i8 0, ptr [[P10]], align 124; 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 030;31 %tmpmem = alloca [10 x i8], align 432 33 ; Make a dynamic alloca, initialize it.34 %p = alloca i8, i32 %n, align 435 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 939 store i8 0, ptr %p1040 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 047}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 454; CHECK-NEXT: [[INALLOCA_SAVE:%.*]] = tail call ptr @llvm.stacksave.p0()55; CHECK-NEXT: [[ARGMEM:%.*]] = alloca inalloca [10 x i8], align 456; 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 958; CHECK-NEXT: store i8 0, ptr [[P10]], align 159; 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 065;66 %tmpmem = alloca [10 x i8], align 467 %inalloca.save = tail call ptr @llvm.stacksave()68 %argmem = alloca inalloca [10 x i8], align 469 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 973 store i8 0, ptr %p1074 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 081}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