xref: /llvm-project/llvm/test/Transforms/MemCpyOpt/merge-into-memset.ll (revision a11faeed446882a81e79d780125d93e7199df645)
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -passes=memcpyopt -S -verify-memoryssa | FileCheck %s
3
4target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
5
6; Don't delete the memcpy in %if.then, even though it depends on an instruction
7; which will be deleted.
8
9define void @foo(i1 %c, ptr %d, ptr %e, ptr %f) {
10; CHECK-LABEL: @foo(
11; CHECK-NEXT:  entry:
12; CHECK-NEXT:    [[TMP:%.*]] = alloca [50 x i8], align 8
13; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[TMP]], i64 1
14; CHECK-NEXT:    call void @llvm.memset.p0.i64(ptr nonnull [[D:%.*]], i8 0, i64 10, i1 false)
15; CHECK-NEXT:    call void @llvm.memset.p0.i64(ptr align 8 [[TMP]], i8 0, i64 11, i1 false)
16; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF_THEN:%.*]], label [[EXIT:%.*]]
17; CHECK:       if.then:
18; CHECK-NEXT:    call void @llvm.memset.p0.i64(ptr align 8 [[F:%.*]], i8 0, i64 11, i1 false)
19; CHECK-NEXT:    br label [[EXIT]]
20; CHECK:       exit:
21; CHECK-NEXT:    ret void
22;
23entry:
24  %tmp = alloca [50 x i8], align 8
25  %tmp1 = getelementptr inbounds i8, ptr %tmp, i64 1
26  call void @llvm.memset.p0.i64(ptr nonnull %d, i8 0, i64 10, i1 false)
27  store i8 0, ptr %tmp, align 8
28  call void @llvm.memcpy.p0.p0.i64(ptr nonnull %tmp1, ptr nonnull %d, i64 10, i1 false)
29  br i1 %c, label %if.then, label %exit
30
31if.then:
32  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %f, ptr nonnull align 8 %tmp, i64 30, i1 false)
33  br label %exit
34
35exit:
36  ret void
37}
38
39declare void @llvm.memcpy.p0.p0.i64(ptr, ptr, i64, i1)
40declare void @llvm.memset.p0.i64(ptr, i8, i64, i1)
41