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if jump threading is able to infer interesting values on both

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the LHS and RHS of an and/or instruction, don't multiply add
known predecessor values.  This fixes the crash on testcase
from PR7498


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108114 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-07-12 00:47:34 +00:00
parent eae2895120
commit 0a96144aac
2 changed files with 37 additions and 2 deletions
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24
test/Transforms/JumpThreading/crash.ll
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@@ -363,3 +363,27 @@ F:
ret i32 1422
}
; PR7498
define void @test14() nounwind {
entry:
%cmp33 = icmp slt i8 undef, 0 ; <i1> [#uses=1]
%tobool = icmp eq i8 undef, 0 ; <i1> [#uses=1]
br i1 %tobool, label %land.end69, label %land.rhs
land.rhs: ; preds = %entry
br label %land.end69
land.end69: ; preds = %land.rhs, %entry
%0 = phi i1 [ undef, %land.rhs ], [ true, %entry ] ; <i1> [#uses=1]
%cmp71 = or i1 true, %0 ; <i1> [#uses=1]
%cmp73 = xor i1 %cmp33, %cmp71 ; <i1> [#uses=1]
br i1 %cmp73, label %if.then, label %if.end
if.then: ; preds = %land.end69
ret void
if.end: ; preds = %land.end69
ret void
}