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llvm-project/llvm/test/Transforms/GVN/2008-07-02-Unreachable.ll

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[GVN] Use FileCheck instead of grep for tests. llvm-svn: 275739
2016-07-18 07:21:26 +08:00
; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
A better fix for PR2503 that doesn't pessimize GVN in the presence of unreachable blocks. llvm-svn: 53032
2008-07-03 01:20:16 +08:00
; PR2503
don't require GVN to work on dead values, just make the test return the loaded value. llvm-svn: 60252
2008-11-30 05:21:48 +08:00
A better fix for PR2503 that doesn't pessimize GVN in the presence of unreachable blocks. llvm-svn: 53032
2008-07-03 01:20:16 +08:00
@g_3 = external global i8 ; <i8*> [#uses=2]
Fix PR17952. The symptom is that an assertion is triggered. The assertion was added by me to detect the situation when value is propagated from dead blocks. (We can certainly get rid of assertion; it is safe to do so, because propagating value from dead block to alive join node is certainly ok.) The root cause of this bug is : edge-splitting is conducted on the fly, the edge being split could be a dead edge, therefore the block that split the critial edge needs to be flagged "dead" as well. There are 3 ways to fix this bug: 1) Get rid of the assertion as I mentioned eariler 2) When an dead edge is split, flag the inserted block "dead". 3) proactively split the critical edges connecting dead and live blocks when new dead blocks are revealed. This fix go for 3) with additional 2 LOC. Testing case was added by Rafael the other day. llvm-svn: 194424
2013-11-12 06:00:23 +08:00
define i8 @func_1(i32 %x, i32 %y) nounwind {
A better fix for PR2503 that doesn't pessimize GVN in the presence of unreachable blocks. llvm-svn: 53032
2008-07-03 01:20:16 +08:00
entry:
remove a trivial test, make some other tests less trivial. llvm-svn: 131846
2011-05-22 15:02:43 +08:00
%A = alloca i8
Fix PR17952. The symptom is that an assertion is triggered. The assertion was added by me to detect the situation when value is propagated from dead blocks. (We can certainly get rid of assertion; it is safe to do so, because propagating value from dead block to alive join node is certainly ok.) The root cause of this bug is : edge-splitting is conducted on the fly, the edge being split could be a dead edge, therefore the block that split the critial edge needs to be flagged "dead" as well. There are 3 ways to fix this bug: 1) Get rid of the assertion as I mentioned eariler 2) When an dead edge is split, flag the inserted block "dead". 3) proactively split the critical edges connecting dead and live blocks when new dead blocks are revealed. This fix go for 3) with additional 2 LOC. Testing case was added by Rafael the other day. llvm-svn: 194424
2013-11-12 06:00:23 +08:00
%cmp = icmp eq i32 %x, %y
br i1 %cmp, label %ifelse, label %ifthen
A better fix for PR2503 that doesn't pessimize GVN in the presence of unreachable blocks. llvm-svn: 53032
2008-07-03 01:20:16 +08:00
ifthen: ; preds = %entry
br label %ifend
ifelse: ; preds = %entry
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%tmp3 = load i8, i8* @g_3 ; <i8> [#uses=0]
remove a trivial test, make some other tests less trivial. llvm-svn: 131846
2011-05-22 15:02:43 +08:00
store i8 %tmp3, i8* %A
A better fix for PR2503 that doesn't pessimize GVN in the presence of unreachable blocks. llvm-svn: 53032
2008-07-03 01:20:16 +08:00
br label %afterfor
forcond: ; preds = %forinc
br i1 false, label %afterfor, label %forbody
forbody: ; preds = %forcond
br label %forinc
forinc: ; preds = %forbody
br label %forcond
afterfor: ; preds = %forcond, %forcond.thread
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%tmp10 = load i8, i8* @g_3 ; <i8> [#uses=0]
don't require GVN to work on dead values, just make the test return the loaded value. llvm-svn: 60252
2008-11-30 05:21:48 +08:00
ret i8 %tmp10
[GVN] Use FileCheck instead of grep for tests. llvm-svn: 275739
2016-07-18 07:21:26 +08:00
; CHECK: ret i8 %tmp3
A better fix for PR2503 that doesn't pessimize GVN in the presence of unreachable blocks. llvm-svn: 53032
2008-07-03 01:20:16 +08:00
ifend: ; preds = %afterfor, %ifthen
don't require GVN to work on dead values, just make the test return the loaded value. llvm-svn: 60252
2008-11-30 05:21:48 +08:00
ret i8 0
A better fix for PR2503 that doesn't pessimize GVN in the presence of unreachable blocks. llvm-svn: 53032
2008-07-03 01:20:16 +08:00
}