From bdcc6d3d2638b3a2c99ab3b9bfaa9c02e584993a Mon Sep 17 00:00:00 2001 From: Matt Arsenault Date: Tue, 1 Oct 2019 02:07:16 +0000 Subject: GlobalISel: Handle llvm.read_register SelectionDAG has a bunch of machinery to defer this to selection time for some reason. Just directly emit a copy during IRTranslator. The x86 usage does somewhat questionably check hasFP, which could depend on the whole function being at minimum translated. This does lose the convergent bit if the callsite had it, which may be a problem. We also lose that in general for intrinsics, which may also be a problem. llvm-svn: 373294 --- llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'llvm/lib') diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp index 37ac96e5290..e1cfb96e13c 100644 --- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp +++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp @@ -1523,6 +1523,21 @@ bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID, case Intrinsic::sideeffect: // Discard annotate attributes, assumptions, and artificial side-effects. return true; + case Intrinsic::read_register: { + Value *Arg = CI.getArgOperand(0); + const Metadata *MD = cast(Arg)->getMetadata(); + const MDString *RegStr = cast(cast(MD)->getOperand(0)); + + auto *TLI = MF->getSubtarget().getTargetLowering(); + Register Dst = getOrCreateVReg(CI); + EVT VT = TLI->getValueType(*DL, CI.getType()); + Register Reg = TLI->getRegisterByName(RegStr->getString().data(), VT, *MF); + if (!Reg.isValid()) + return false; + + MIRBuilder.buildCopy(Dst, Reg); + return true; + } } return false; } -- cgit v1.2.3