[mips] Prevent shrink-wrap for BuildPairF64, ExtractElementF64 when they use $sp
For a certain combination of options, BuildPairF64_{64}, ExtractElementF64{_64}
may be expanded into instructions using stack.
Add implicit operand $sp for such cases so that ShrinkWrapping doesn't move
prologue setup below them.
Fixes MultiSource/Benchmarks/MallocBench/cfrac for
'--target=mips-img-linux-gnu -mcpu=mips32r6 -mfpxx -mnan=2008'
and
'--target=mips-img-linux-gnu -mcpu=mips32r6 -mfp64 -mnan=2008 -mno-odd-spreg'.
Differential Revision: https://reviews.llvm.org/D50986
llvm-svn: 340927
diff --git a/llvm/lib/Target/Mips/MipsSEISelDAGToDAG.cpp b/llvm/lib/Target/Mips/MipsSEISelDAGToDAG.cpp
index 599c1e9..cf2899d 100644
--- a/llvm/lib/Target/Mips/MipsSEISelDAGToDAG.cpp
+++ b/llvm/lib/Target/Mips/MipsSEISelDAGToDAG.cpp
@@ -238,6 +238,18 @@
case Mips::WRDSP:
addDSPCtrlRegOperands(true, MI, MF);
break;
+ case Mips::BuildPairF64_64:
+ case Mips::ExtractElementF64_64:
+ if (!Subtarget->useOddSPReg()) {
+ MI.addOperand(MachineOperand::CreateReg(Mips::SP, false, true));
+ break;
+ }
+ // fallthrough
+ case Mips::BuildPairF64:
+ case Mips::ExtractElementF64:
+ if (Subtarget->isABI_FPXX() && !Subtarget->hasMTHC1())
+ MI.addOperand(MachineOperand::CreateReg(Mips::SP, false, true));
+ break;
default:
replaceUsesWithZeroReg(MRI, MI);
}