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| author | Dan Gohman <gohman@apple.com> | 2012-02-24 00:09:36 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2012-02-24 00:09:36 +0000 |
| commit | db9538923eb95df48e9a6abe7e3b0ba8435915d7 (patch) | |
| tree | 4cf2df843c044f4dc5a692c3e725ce1f87df7df5 /lib/Target/ARM/ARMISelLowering.cpp | |
| parent | 6e6b822b51d2716614a2b2ab17a7023d7879ab70 (diff) | |
When emitting a cmp with 0 for a lowered select, mask out the high
bits of the value carying the boolean condition, as their contents
are undefined. This fixes rdar://10887484.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151310 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/ARM/ARMISelLowering.cpp')
| -rw-r--r-- | lib/Target/ARM/ARMISelLowering.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp index 8a02162665..94ddf86106 100644 --- a/lib/Target/ARM/ARMISelLowering.cpp +++ b/lib/Target/ARM/ARMISelLowering.cpp @@ -2841,6 +2841,11 @@ SDValue ARMTargetLowering::LowerSELECT(SDValue Op, SelectionDAG &DAG) const { } } + // ARM's BooleanContents value is UndefinedBooleanContent. Mask out the + // undefined bits before doing a full-word comparison with zero. + Cond = DAG.getNode(ISD::AND, dl, Cond.getValueType(), Cond, + DAG.getConstant(1, Cond.getValueType())); + return DAG.getSelectCC(dl, Cond, DAG.getConstant(0, Cond.getValueType()), SelectTrue, SelectFalse, ISD::SETNE); |