diff options
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelPattern.cpp | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelPattern.cpp b/llvm/lib/Target/X86/X86ISelPattern.cpp index 7a623e5b414..5f98524c552 100644 --- a/llvm/lib/Target/X86/X86ISelPattern.cpp +++ b/llvm/lib/Target/X86/X86ISelPattern.cpp @@ -1636,6 +1636,24 @@ unsigned ISel::SelectExpr(SDOperand N) { } } + // Fold common multiplies into LEA instructions. + if (Node->getOpcode() == ISD::MUL && N.getValueType() == MVT::i32) { + switch ((int)CN->getValue()) { + default: break; + case 3: + case 5: + case 9: + X86AddressMode AM; + // Remove N from exprmap so SelectAddress doesn't get confused. + ExprMap.erase(N); + SelectAddress(N, AM); + // Restore it to the map. + ExprMap[N] = Result; + addFullAddress(BuildMI(BB, X86::LEA32r, 4, Result), AM); + return Result; + } + } + switch (N.getValueType()) { default: assert(0 && "Cannot xor this type!"); case MVT::i1: |
