49 lines
1.1 KiB
LLVM
49 lines
1.1 KiB
LLVM
|
; 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()
|