[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/X86/X86LegalizerInfo.cpp b/llvm/lib/Target/X86/X86LegalizerInfo.cpp
index 00fb1b5..9690056 100644
--- a/llvm/lib/Target/X86/X86LegalizerInfo.cpp
+++ b/llvm/lib/Target/X86/X86LegalizerInfo.cpp
@@ -13,6 +13,7 @@
#include "X86LegalizerInfo.h"
#include "X86Subtarget.h"
#include "X86TargetMachine.h"
+#include "llvm/CodeGen/GlobalISel/LegalizerHelper.h"
#include "llvm/CodeGen/TargetOpcodes.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/IR/DerivedTypes.h"
@@ -84,6 +85,24 @@
verify(*STI.getInstrInfo());
}
+bool X86LegalizerInfo::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;
+}
+
void X86LegalizerInfo::setLegalizerInfo32bit() {
const LLT p0 = LLT::pointer(0, TM.getPointerSizeInBits(0));