mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-30 16:17:05 +00:00
4323665bd8
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176873 91177308-0d34-0410-b5e6-96231b3b80d8
59 lines
1.5 KiB
LLVM
59 lines
1.5 KiB
LLVM
; REQUIRES: asserts
|
|
; RUN: opt -loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s
|
|
; RUN: opt -loop-unswitch -simplifycfg -S < %s | FileCheck %s
|
|
; PR5373
|
|
|
|
; Loop unswitching shouldn't trivially unswitch the true case of condition %a
|
|
; in the code here because it leads to an infinite loop. While this doesn't
|
|
; contain any instructions with side effects, it's still a kind of side effect.
|
|
; It can trivially unswitch on the false cas of condition %a though.
|
|
|
|
; STATS: 2 loop-unswitch - Number of branches unswitched
|
|
; STATS: 1 loop-unswitch - Number of unswitches that are trivial
|
|
|
|
; CHECK: @func_16
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: br i1 %a, label %entry.split, label %abort0.split
|
|
|
|
; CHECK: entry.split:
|
|
; CHECK-NEXT: br i1 %b, label %cond.end.us, label %abort1
|
|
|
|
; CHECK: cond.end.us:
|
|
; CHECK-NEXT: br label %cond.end.us
|
|
|
|
; CHECK: abort0.split:
|
|
; CHECK-NEXT: call void @end0() [[NOR_NUW:#[0-9]+]]
|
|
; CHECK-NEXT: unreachable
|
|
|
|
; CHECK: abort1:
|
|
; CHECK-NEXT: call void @end1() [[NOR_NUW]]
|
|
; CHECK-NEXT: unreachable
|
|
|
|
; CHECK: }
|
|
|
|
define void @func_16(i1 %a, i1 %b) nounwind {
|
|
entry:
|
|
br label %for.body
|
|
|
|
for.body:
|
|
br i1 %a, label %cond.end, label %abort0
|
|
|
|
cond.end:
|
|
br i1 %b, label %for.body, label %abort1
|
|
|
|
abort0:
|
|
call void @end0() noreturn nounwind
|
|
unreachable
|
|
|
|
abort1:
|
|
call void @end1() noreturn nounwind
|
|
unreachable
|
|
}
|
|
|
|
declare void @end0() noreturn
|
|
declare void @end1() noreturn
|
|
|
|
; CHECK: attributes #0 = { nounwind }
|
|
; CHECK: attributes #1 = { noreturn }
|
|
; CHECK: attributes [[NOR_NUW]] = { noreturn nounwind }
|