[mips] Sign extend i32 return values on MIPS64
Override getTypeForExtReturn so that functions returning
an i32 typed value have it sign extended on MIPS64.
Also provide patterns to get rid of unneeded sign extensions
for arithmetic instructions which implicitly sign extend
their results.
Differential Revision: https://reviews.llvm.org/D48374
llvm-svn: 338019
diff --git a/llvm/lib/Target/Mips/MipsISelLowering.h b/llvm/lib/Target/Mips/MipsISelLowering.h
index 7e5d6a2..b58d92c 100644
--- a/llvm/lib/Target/Mips/MipsISelLowering.h
+++ b/llvm/lib/Target/Mips/MipsISelLowering.h
@@ -280,6 +280,9 @@
return MVT::i32;
}
+ EVT getTypeForExtReturn(LLVMContext &Context, EVT VT,
+ ISD::NodeType) const override;
+
bool isCheapToSpeculateCttz() const override;
bool isCheapToSpeculateCtlz() const override;