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Fix PR7755: knowing something about an inval for a pred

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from the LHS should disable reconsidering that pred on the
RHS.  However, knowing something about the pred on the RHS
shouldn't disable subsequent additions on the RHS from
happening.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111349 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-08-18 03:14:36 +00:00
parent c7e31fcf49
commit 2fa7b48eb5
2 changed files with 28 additions and 8 deletions
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24
test/Transforms/JumpThreading/crash.ll
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@@ -436,4 +436,28 @@ for.cond1040: ; preds = %for.body1044, %for.
ret void
}
; PR7755
define void @test16(i1 %c, i1 %c2, i1 %c3, i1 %c4) nounwind ssp {
entry:
%cmp = icmp sgt i32 undef, 1 ; <i1> [#uses=1]
br i1 %c, label %land.end, label %land.rhs
land.rhs: ; preds = %entry
br i1 %c2, label %lor.lhs.false.i, label %land.end
lor.lhs.false.i: ; preds = %land.rhs
br i1 %c3, label %land.end, label %land.end
land.end:
%0 = phi i1 [ true, %entry ], [ false, %land.rhs ], [false, %lor.lhs.false.i], [false, %lor.lhs.false.i] ; <i1> [#uses=1]
%cmp12 = and i1 %cmp, %0
%xor1 = xor i1 %cmp12, %c4
br i1 %xor1, label %if.then, label %if.end
if.then:
ret void
if.end:
ret void
}