Fix 12513: Loop unrolling breaks with indirect branches.

Take this opportunity to generalize the indirectbr bailout logic for
loop transformations. CFG transformations will never get indirectbr
right, and there's no point trying.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154386 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-04-10 05:14:42 +00:00
parent 64c0748eb3
commit d9fc1ce809
6 changed files with 75 additions and 37 deletions

View File

@@ -1,18 +1,13 @@
; RUN: opt -loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s
; RUN: opt -S -loop-unswitch -verify-loop-info -verify-dom-info %s | FileCheck %s
; STATS: 1 loop-unswitch - Total number of instructions analyzed
; RUN: opt < %s -S -loop-unswitch -verify-loop-info -verify-dom-info | FileCheck %s
; PR12343: -loop-unswitch crash on indirect branch
; CHECK: %0 = icmp eq i64 undef, 0
; CHECK-NEXT: br i1 %0, label %"5", label %"4"
; CHECK: "5": ; preds = %entry
; CHECK-NEXT: br label %"5.split"
; CHECK: "5.split": ; preds = %"5"
; CHECK-NEXT: br label %"16"
; CHECK: "16": ; preds = %"22", %"5.split"
; CHECK: "16": ; preds = %"22", %"5"
; CHECK-NEXT: indirectbr i8* undef, [label %"22", label %"33"]
; CHECK: "22": ; preds = %"16"