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[RegisterBankInfo] Strengthen getInstrMappingImpl.

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Teach the target independent code how to take advantage of type
information to get the mapping of an instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265739 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Quentin Colombet 2016-04-07 22:52:49 +00:00
parent cea52301d3
commit 90905a009c
1 changed files with 19 additions and 12 deletions
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31
lib/CodeGen/GlobalISel/RegisterBankInfo.cpp
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@ -18,6 +18,7 @@
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetInstrInfo.h"
@ -255,18 +256,26 @@ RegisterBankInfo::getInstrMappingImpl(const MachineInstr &MI) const {
// the register bank from the encoding constraints.
CurRegBank = getRegBankFromConstraints(MI, OpIdx, TII, TRI);
if (!CurRegBank) {
// All our attempts failed, give up.
CompleteMapping = false;
// Check if we can deduce the register bank from the type of
// the instruction.
Type *MITy = MI.getType();
if (MITy)
CurRegBank = getRegBankForType(
MVT::getVT(MITy, /*HandleUnknown*/ true).SimpleTy);
if (!CurRegBank) {
// All our attempts failed, give up.
CompleteMapping = false;
if (!isCopyLike)
// MI does not carry enough information to guess the mapping.
return InstructionMapping();
if (!isCopyLike)
// MI does not carry enough information to guess the mapping.
return InstructionMapping();
// For copies, we want to keep interating to find a register
// bank for the other operands if we did not find one yet.
if (RegBank)
break;
continue;
// For copies, we want to keep interating to find a register
// bank for the other operands if we did not find one yet.
if (RegBank)
break;
continue;
}
}
}
RegBank = CurRegBank;
@ -298,11 +307,9 @@ RegisterBankInfo::getInstrMappingImpl(const MachineInstr &MI) const {
RegisterBankInfo::InstructionMapping
RegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
if (!isPreISelGenericOpcode(MI.getOpcode())) {
RegisterBankInfo::InstructionMapping Mapping = getInstrMappingImpl(MI);
if (Mapping.isValid())
return Mapping;
}
llvm_unreachable("The target must implement this");
}