diff options
| author | Chris Lattner <sabre@nondot.org> | 2005-01-16 00:17:20 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-01-16 00:17:20 +0000 |
| commit | 0fe7776da5d5c3f63c03d6bf5a01d293da5f73d3 (patch) | |
| tree | 9d208458573bddf0986272ac3a3b0896cd332ba9 /llvm/lib/CodeGen | |
| parent | 4d97864e927a2cf9fadbb78503507a74ed72d03a (diff) | |
| download | bcm5719-llvm-0fe7776da5d5c3f63c03d6bf5a01d293da5f73d3.tar.gz bcm5719-llvm-0fe7776da5d5c3f63c03d6bf5a01d293da5f73d3.zip | |
Eliminate unneeded extensions.
llvm-svn: 19577
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 89c53e8c1ba..d3d44a82e08 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -855,6 +855,15 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, "Cannot *_EXTEND_INREG FP types"); if (EVT == VT) return N1; // Not actually extending assert(EVT < VT && "Not extending!"); + + // If we are sign extending an extension, use the original source. + if (N1.getOpcode() == ISD::ZERO_EXTEND_INREG || + N1.getOpcode() == ISD::SIGN_EXTEND_INREG) { + if (N1.getOpcode() == Opcode && + cast<MVTSDNode>(N1)->getExtraValueType() <= EVT) + return N1; + } + break; } |
