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| author | Craig Topper <craig.topper@intel.com> | 2019-04-10 17:27:29 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@intel.com> | 2019-04-10 17:27:29 +0000 |
| commit | 35fe07916aeae037c6e90ca9c384349c390bead4 (patch) | |
| tree | c2392da9d4f58d3b342b23c017f9fdb64b7664e3 /llvm/lib | |
| parent | 6e84a09ee9b31258ea2a9507b50ea3ddf01c1e30 (diff) | |
| download | bcm5719-llvm-35fe07916aeae037c6e90ca9c384349c390bead4.tar.gz bcm5719-llvm-35fe07916aeae037c6e90ca9c384349c390bead4.zip | |
[AArch64] Teach getTestBitOperand to look through ANY_EXTENDS
This patch teach getTestBitOperand to look through ANY_EXTENDs when the extended bits aren't used. The test case changed here is based what D60358 did to test16 in tbz-tbnz.ll. So this patch will avoid that regression.
Differential Revision: https://reviews.llvm.org/D60482
llvm-svn: 358108
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/AArch64/AArch64ISelLowering.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp index 84a66a20fd5..f97fc4091bc 100644 --- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp +++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp @@ -11038,6 +11038,12 @@ static SDValue getTestBitOperand(SDValue Op, unsigned &Bit, bool &Invert, return getTestBitOperand(Op->getOperand(0), Bit, Invert, DAG); } + // (tbz (any_ext x), b) -> (tbz x, b) if we don't use the extended bits. + if (Op->getOpcode() == ISD::ANY_EXTEND && + Bit < Op->getOperand(0).getValueSizeInBits()) { + return getTestBitOperand(Op->getOperand(0), Bit, Invert, DAG); + } + if (Op->getNumOperands() != 2) return Op; |
