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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2013-02-04 15:19:18 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2013-02-04 15:19:18 +0000 |
| commit | 548ffa274a2c6ff82015139cef8cf4bb7a20bda9 (patch) | |
| tree | 889139a20b4cf54884c051dc9e00d0f1cf27c21d /llvm/lib/Target/PowerPC/PPCISelLowering.cpp | |
| parent | aefc30f2a4632584f0a7d1e9fc76e7add719455a (diff) | |
| download | bcm5719-llvm-548ffa274a2c6ff82015139cef8cf4bb7a20bda9.tar.gz bcm5719-llvm-548ffa274a2c6ff82015139cef8cf4bb7a20bda9.zip | |
SelectionDAG: Teach FoldConstantArithmetic how to deal with vectors.
This required disabling a PowerPC optimization that did the following:
input:
x = BUILD_VECTOR <i32 16, i32 16, i32 16, i32 16>
lowered to:
tmp = BUILD_VECTOR <i32 8, i32 8, i32 8, i32 8>
x = ADD tmp, tmp
The add now gets folded immediately and we're back at the BUILD_VECTOR we
started from. I don't see a way to fix this currently so I left it disabled
for now.
Fix some trivially foldable X86 tests too.
llvm-svn: 174325
Diffstat (limited to 'llvm/lib/Target/PowerPC/PPCISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCISelLowering.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp index 9a68927103e..4cd0fc484a1 100644 --- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp @@ -5032,9 +5032,14 @@ SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op, // If this value is in the range [-32,30] and is even, use: // tmp = VSPLTI[bhw], result = add tmp, tmp if (SextVal >= -32 && SextVal <= 30 && (SextVal & 1) == 0) { + // FIXME: This is currently disabled because the ADD will be folded back + // into an invalid BUILD_VECTOR immediately. + return SDValue(); +#if 0 SDValue Res = BuildSplatI(SextVal >> 1, SplatSize, MVT::Other, DAG, dl); Res = DAG.getNode(ISD::ADD, dl, Res.getValueType(), Res, Res); return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res); +#endif } // If this is 0x8000_0000 x 4, turn into vspltisw + vslw. If it is |
