[mips] Optimize materialization of i64 constants
Avoid MipsAnalyzeImmediate usage if the constant fits in an 32-bit
integer. This allows us to generate the same instructions for the
materialization of the same constants regardless the width of their
type.
Patch by: Vasileios Kalintiris
Contributions by: Simon Dardis
Reviewers: Daniel Sanders
Differential Review: https://reviews.llvm.org/D21689
llvm-svn: 276628
diff --git a/llvm/lib/Target/Mips/MipsSEISelDAGToDAG.cpp b/llvm/lib/Target/Mips/MipsSEISelDAGToDAG.cpp
index d9528da..ff2f775 100644
--- a/llvm/lib/Target/Mips/MipsSEISelDAGToDAG.cpp
+++ b/llvm/lib/Target/Mips/MipsSEISelDAGToDAG.cpp
@@ -771,13 +771,13 @@
case ISD::Constant: {
const ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Node);
+ int64_t Imm = CN->getSExtValue();
unsigned Size = CN->getValueSizeInBits(0);
- if (Size == 32)
+ if (isInt<32>(Imm))
break;
MipsAnalyzeImmediate AnalyzeImm;
- int64_t Imm = CN->getSExtValue();
const MipsAnalyzeImmediate::InstSeq &Seq =
AnalyzeImm.Analyze(Imm, Size, false);