| ; RUN: opt -codegenprepare -S -mtriple=x86_64-linux < %s | FileCheck %s |
| |
| ; The ret instruction can be duplicated into BB case2 even though there is an |
| ; intermediate BB exit1 and call to llvm.assume. |
| |
| @ptr = external global i8*, align 8 |
| |
| ; CHECK: %ret1 = tail call i8* @qux() |
| ; CHECK-NEXT: ret i8* %ret1 |
| |
| ; CHECK: %ret2 = tail call i8* @bar() |
| ; CHECK-NEXT: ret i8* %ret2 |
| |
| define i8* @foo(i64 %size, i64 %v1, i64 %v2) { |
| entry: |
| %cmp1 = icmp ult i64 %size, 1025 |
| br i1 %cmp1, label %if.end, label %case1 |
| |
| case1: |
| %ret1 = tail call i8* @qux() |
| br label %exit2 |
| |
| if.end: |
| %cmp2 = icmp ult i64 %v1, %v2 |
| br i1 %cmp2, label %case3, label %case2 |
| |
| case2: |
| %ret2 = tail call i8* @bar() |
| br label %exit1 |
| |
| case3: |
| %ret3 = load i8*, i8** @ptr, align 8 |
| br label %exit1 |
| |
| exit1: |
| %retval1 = phi i8* [ %ret2, %case2 ], [ %ret3, %case3 ] |
| %cmp3 = icmp ne i8* %retval1, null |
| tail call void @llvm.assume(i1 %cmp3) |
| br label %exit2 |
| |
| exit2: |
| %retval2 = phi i8* [ %ret1, %case1 ], [ %retval1, %exit1 ] |
| ret i8* %retval2 |
| } |
| |
| declare void @llvm.assume(i1) |
| declare i8* @qux() |
| declare i8* @bar() |
