forked from llvm-mirror/llvm
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
http://llvm.org/bugs/show_bug.cgi?id=12343 We have not trivial way for splitting edges that are goes from indirect branch. We can do it with some tricks, but it should be additionally discussed. And it is still dangerous due to difficulty of indirect branches controlling. Fix forbids this case for unswitching. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153879 91177308-0d34-0410-b5e6-96231b3b80d8
- Loading branch information
Showing
2 changed files
with
75 additions
and
4 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,46 @@ | ||
; 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 | ||
|
||
; 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-NEXT: indirectbr i8* undef, [label %"22", label %"33"] | ||
|
||
; CHECK: "22": ; preds = %"16" | ||
; CHECK-NEXT: br i1 %0, label %"16", label %"26" | ||
|
||
; CHECK: "26": ; preds = %"22" | ||
; CHECK-NEXT: unreachable | ||
|
||
define void @foo() { | ||
entry: | ||
%0 = icmp eq i64 undef, 0 | ||
br i1 %0, label %"5", label %"4" | ||
|
||
"4": ; preds = %entry | ||
unreachable | ||
|
||
"5": ; preds = %entry | ||
br label %"16" | ||
|
||
"16": ; preds = %"22", %"5" | ||
indirectbr i8* undef, [label %"22", label %"33"] | ||
|
||
"22": ; preds = %"16" | ||
br i1 %0, label %"16", label %"26" | ||
|
||
"26": ; preds = %"22" | ||
unreachable | ||
|
||
"33": ; preds = %"16" | ||
unreachable | ||
} |