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Get rid of an optimization in SCCP which appears to have many issues. Specifically, it doesn't handle many cases involving undef correctly, and it is missing other checks which

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lead to it trying to re-mark a value marked as a constant with a different value.  It also appears to trigger very rarely.

Fixes PR11357.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144352 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-11-11 01:16:15 +00:00
parent cf3b89f9a8
commit b80f778bd3
2 changed files with 1 additions and 187 deletions
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20
test/Transforms/SCCP/phitest.ll
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@@ -1,20 +0,0 @@
; RUN: opt < %s -sccp -dce -simplifycfg -S | not grep br
define i32 @test(i32 %param) {
entry:
%tmp.1 = icmp ne i32 %param, 0 ; <i1> [#uses=1]
br i1 %tmp.1, label %endif.0, label %else
else: ; preds = %entry
br label %endif.0
endif.0: ; preds = %else, %entry
%a.0 = phi i32 [ 2, %else ], [ 3, %entry ] ; <i32> [#uses=1]
%b.0 = phi i32 [ 3, %else ], [ 2, %entry ] ; <i32> [#uses=1]
%tmp.5 = add i32 %a.0, %b.0 ; <i32> [#uses=1]
%tmp.7 = icmp ne i32 %tmp.5, 5 ; <i1> [#uses=1]
br i1 %tmp.7, label %UnifiedReturnBlock, label %endif.1
endif.1: ; preds = %endif.0
ret i32 0
UnifiedReturnBlock: ; preds = %endif.0
ret i32 2
}