Evan Cheng b64dd5f2b5 X86 cmp lowering is looking past truncate on the condition node. It should only
do so when the high bits are known zero. This caused a subtle miscompilation.

rdar://12027825 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161451 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-07 22:21:00 +00:00
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2012-07-23 08:51:15 +00:00