| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -S -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) { |
| ; NO_MSSA-LABEL: @test_norestore( |
| ; NO_MSSA-NEXT: [[TMPMEM:%.*]] = alloca [10 x i8], align 4 |
| ; NO_MSSA-NEXT: [[TMP:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[TMPMEM]], i32 0, i32 0 |
| ; NO_MSSA-NEXT: [[P:%.*]] = alloca i8, i32 [[N:%.*]], align 4 |
| ; NO_MSSA-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) |
| ; NO_MSSA-NEXT: [[P10:%.*]] = getelementptr inbounds i8, i8* [[P]], i32 9 |
| ; NO_MSSA-NEXT: store i8 0, i8* [[P10]], align 1 |
| ; NO_MSSA-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[TMP]], i8* [[P]], i32 10, i1 false) |
| ; NO_MSSA-NEXT: call void @external() |
| ; NO_MSSA-NEXT: [[HEAP:%.*]] = call i8* @malloc(i32 9) |
| ; NO_MSSA-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[HEAP]], i8* [[P]], i32 9, i1 false) |
| ; NO_MSSA-NEXT: call void @useit(i8* [[HEAP]]) |
| ; NO_MSSA-NEXT: ret i32 0 |
| ; |
| ; MSSA-LABEL: @test_norestore( |
| ; MSSA-NEXT: [[TMPMEM:%.*]] = alloca [10 x i8], align 4 |
| ; MSSA-NEXT: [[TMP:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[TMPMEM]], i32 0, i32 0 |
| ; MSSA-NEXT: [[P:%.*]] = alloca i8, i32 [[N:%.*]], align 4 |
| ; MSSA-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) |
| ; MSSA-NEXT: [[P10:%.*]] = getelementptr inbounds i8, i8* [[P]], i32 9 |
| ; MSSA-NEXT: store i8 0, i8* [[P10]], align 1 |
| ; MSSA-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[TMP]], i8* [[P]], i32 10, i1 false) |
| ; MSSA-NEXT: call void @external() |
| ; MSSA-NEXT: [[HEAP:%.*]] = call i8* @malloc(i32 9) |
| ; MSSA-NEXT: call void @llvm.memmove.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) |
| ; MSSA-NEXT: call void @useit(i8* [[HEAP]]) |
| ; MSSA-NEXT: ret i32 0 |
| ; |
| %tmpmem = alloca [10 x i8], align 4 |
| %tmp = getelementptr inbounds [10 x i8], [10 x i8]* %tmpmem, i32 0, i32 0 |
| |
| ; Make a dynamic alloca, initialize it. |
| %p = alloca i8, i32 %n, align 4 |
| 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) |
| |
| ; This extra byte exists to prevent memcpyopt from propagating @str. |
| %p10 = getelementptr inbounds i8, i8* %p, i32 9 |
| store i8 0, i8* %p10 |
| |
| call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* %p, i32 10, i1 false) |
| call void @external() |
| %heap = call i8* @malloc(i32 9) |
| call void @llvm.memcpy.p0i8.p0i8.i32(i8* %heap, i8* %tmp, i32 9, i1 false) |
| call void @useit(i8* %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: [[TMP:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[TMPMEM]], i32 0, i32 0 |
| ; CHECK-NEXT: [[INALLOCA_SAVE:%.*]] = tail call i8* @llvm.stacksave() |
| ; CHECK-NEXT: [[ARGMEM:%.*]] = alloca inalloca [10 x i8], align 4 |
| ; CHECK-NEXT: [[P:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[ARGMEM]], i32 0, i32 0 |
| ; 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) |
| ; CHECK-NEXT: [[P10:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[ARGMEM]], i32 0, i32 9 |
| ; CHECK-NEXT: store i8 0, i8* [[P10]], align 1 |
| ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[TMP]], i8* [[P]], i32 10, i1 false) |
| ; CHECK-NEXT: call void @llvm.stackrestore(i8* [[INALLOCA_SAVE]]) |
| ; CHECK-NEXT: [[HEAP:%.*]] = call i8* @malloc(i32 9) |
| ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[HEAP]], i8* [[TMP]], i32 9, i1 false) |
| ; CHECK-NEXT: call void @useit(i8* [[HEAP]]) |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| %tmpmem = alloca [10 x i8], align 4 |
| %tmp = getelementptr inbounds [10 x i8], [10 x i8]* %tmpmem, i32 0, i32 0 |
| %inalloca.save = tail call i8* @llvm.stacksave() |
| %argmem = alloca inalloca [10 x i8], align 4 |
| %p = getelementptr inbounds [10 x i8], [10 x i8]* %argmem, i32 0, i32 0 |
| 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) |
| |
| ; This extra byte exists to prevent memcpyopt from propagating @str. |
| %p10 = getelementptr inbounds [10 x i8], [10 x i8]* %argmem, i32 0, i32 9 |
| store i8 0, i8* %p10 |
| |
| call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* %p, i32 10, i1 false) |
| call void @llvm.stackrestore(i8* %inalloca.save) |
| %heap = call i8* @malloc(i32 9) |
| call void @llvm.memcpy.p0i8.p0i8.i32(i8* %heap, i8* %tmp, i32 9, i1 false) |
| call void @useit(i8* %heap) |
| ret i32 0 |
| } |
| |
| declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture writeonly, i8* nocapture readonly, i32, i1) |
| declare i8* @llvm.stacksave() |
| declare void @llvm.stackrestore(i8*) |
| declare i8* @malloc(i32) |
| declare void @useit(i8*) |
| declare void @external() |