[GlobalISel] Translate calls to memcpy et al to G_INTRINSIC_W_SIDE_EFFECTs and legalize later.
I plan on adding memcpy optimizations in the GlobalISel pipeline, but we can't
do that unless we delay lowering to actual function calls. This patch changes
the translator to generate G_INTRINSIC_W_SIDE_EFFECTS for these functions, and
then have each target specify that using the new custom legalizer for intrinsics
hook that they want it expanded it a libcall.
Differential Revision: https://reviews.llvm.org/D64895
llvm-svn: 366516
diff --git a/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp b/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
index e442a81..4abc4b2 100644
--- a/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
@@ -153,3 +153,20 @@
return false;
}
+
+bool MipsLegalizerInfo::legalizeIntrinsic(MachineInstr &MI, MachineRegisterInfo &MRI,
+ MachineIRBuilder &MIRBuilder) const {
+ switch (MI.getIntrinsicID()) {
+ case Intrinsic::memcpy:
+ case Intrinsic::memset:
+ case Intrinsic::memmove:
+ if (createMemLibcall(MIRBuilder, MRI, MI) ==
+ LegalizerHelper::UnableToLegalize)
+ return false;
+ MI.eraseFromParent();
+ return true;
+ default:
+ break;
+ }
+ return true;
+}