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[FastISel][AArch64] Factor out ANDWri instruction generation into a helper function. NFCI.

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llvm-svn: 216199
This commit is contained in:
Juergen Ributzka 2014-08-21 18:02:25 +00:00
parent 434b09b95f
commit 3f0a3fc649
1 changed files with 50 additions and 42 deletions
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92
lib/Target/AArch64/AArch64FastISel.cpp
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@ -186,6 +186,7 @@ private:
unsigned RHSReg, bool RHSIsKill,
AArch64_AM::ShiftExtendType ShiftType, uint64_t ShiftImm,
bool WantResult = true);
unsigned emitAND_ri(MVT RetVT, unsigned LHSReg, bool LHSIsKill, uint64_t Imm);
unsigned Emit_MUL_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill);
unsigned Emit_SMULL_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
@ -1101,6 +1102,34 @@ unsigned AArch64FastISel::emitSubs_rs(MVT RetVT, unsigned LHSReg,
ShiftType, ShiftImm, WantResult);
}
// FIXME: This should be eventually generated automatically by tblgen.
unsigned AArch64FastISel::emitAND_ri(MVT RetVT, unsigned LHSReg, bool LHSIsKill,
uint64_t Imm) {
const TargetRegisterClass *RC = nullptr;
unsigned Opc = 0;
unsigned RegSize = 0;
switch (RetVT.SimpleTy) {
default:
return 0;
case MVT::i32:
Opc = AArch64::ANDWri;
RC = &AArch64::GPR32spRegClass;
RegSize = 32;
break;
case MVT::i64:
Opc = AArch64::ANDXri;
RC = &AArch64::GPR64spRegClass;
RegSize = 64;
break;
}
if (!AArch64_AM::isLogicalImmediate(Imm, RegSize))
return 0;
return FastEmitInst_ri(Opc, RC, LHSReg, LHSIsKill,
AArch64_AM::encodeLogicalImmediate(Imm, RegSize));
}
bool AArch64FastISel::EmitLoad(MVT VT, unsigned &ResultReg, Address Addr,
MachineMemOperand *MMO) {
// Simplify this down to something we can handle.
@ -1167,12 +1196,8 @@ bool AArch64FastISel::EmitLoad(MVT VT, unsigned &ResultReg, Address Addr,
// Loading an i1 requires special handling.
if (VTIsi1) {
MRI.constrainRegClass(ResultReg, &AArch64::GPR32RegClass);
unsigned ANDReg = createResultReg(&AArch64::GPR32spRegClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ANDWri),
ANDReg)
.addReg(ResultReg)
.addImm(AArch64_AM::encodeLogicalImmediate(1, 32));
unsigned ANDReg = emitAND_ri(MVT::i32, ResultReg, /*IsKill=*/true, 1);
assert(ANDReg && "Unexpected AND instruction emission failure.");
ResultReg = ANDReg;
}
return true;
@ -1260,12 +1285,8 @@ bool AArch64FastISel::EmitStore(MVT VT, unsigned SrcReg, Address Addr,
// Storing an i1 requires special handling.
if (VTIsi1) {
MRI.constrainRegClass(SrcReg, &AArch64::GPR32RegClass);
unsigned ANDReg = createResultReg(&AArch64::GPR32spRegClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ANDWri),
ANDReg)
.addReg(SrcReg)
.addImm(AArch64_AM::encodeLogicalImmediate(1, 32));
unsigned ANDReg = emitAND_ri(MVT::i32, SrcReg, /*TODO:IsKill=*/false, 1);
assert(ANDReg && "Unexpected AND instruction emission failure.");
SrcReg = ANDReg;
}
// Create the base instruction, then add the operands.
@ -1385,20 +1406,19 @@ bool AArch64FastISel::SelectBranch(const Instruction *I) {
if (TI->hasOneUse() && TI->getParent() == I->getParent() &&
(isLoadStoreTypeLegal(TI->getOperand(0)->getType(), SrcVT))) {
unsigned CondReg = getRegForValue(TI->getOperand(0));
if (CondReg == 0)
if (!CondReg)
return false;
bool CondIsKill = hasTrivialKill(TI->getOperand(0));
// Issue an extract_subreg to get the lower 32-bits.
if (SrcVT == MVT::i64)
CondReg = FastEmitInst_extractsubreg(MVT::i32, CondReg, /*Kill=*/true,
if (SrcVT == MVT::i64) {
CondReg = FastEmitInst_extractsubreg(MVT::i32, CondReg, CondIsKill,
AArch64::sub_32);
CondIsKill = true;
}
MRI.constrainRegClass(CondReg, &AArch64::GPR32RegClass);
unsigned ANDReg = createResultReg(&AArch64::GPR32spRegClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
TII.get(AArch64::ANDWri), ANDReg)
.addReg(CondReg)
.addImm(AArch64_AM::encodeLogicalImmediate(1, 32));
unsigned ANDReg = emitAND_ri(MVT::i32, CondReg, CondIsKill, 1);
assert(ANDReg && "Unexpected AND instruction emission failure.");
emitICmp_ri(MVT::i32, ANDReg, /*IsKill=*/true, 0);
if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
@ -1565,13 +1585,9 @@ bool AArch64FastISel::SelectSelect(const Instruction *I) {
bool CondIsKill = hasTrivialKill(Cond);
if (NeedTest) {
MRI.constrainRegClass(CondReg, &AArch64::GPR32RegClass);
unsigned ANDReg = createResultReg(&AArch64::GPR32spRegClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ANDWri),
ANDReg)
.addReg(CondReg, getKillRegState(CondIsKill))
.addImm(AArch64_AM::encodeLogicalImmediate(1, 32));
emitICmp_ri(MVT::i32, ANDReg, true, 0);
unsigned ANDReg = emitAND_ri(MVT::i32, CondReg, CondIsKill, 1);
assert(ANDReg && "Unexpected AND instruction emission failure.");
emitICmp_ri(MVT::i32, ANDReg, /*IsKill=*/true, 0);
}
unsigned TrueReg = getRegForValue(SI->getTrueValue());
@ -2508,6 +2524,7 @@ bool AArch64FastISel::SelectTrunc(const Instruction *I) {
unsigned SrcReg = getRegForValue(Op);
if (!SrcReg)
return false;
bool SrcIsKill = hasTrivialKill(Op);
// If we're truncating from i64 to a smaller non-legal type then generate an
// AND. Otherwise, we know the high bits are undefined and a truncate doesn't
@ -2529,15 +2546,11 @@ bool AArch64FastISel::SelectTrunc(const Instruction *I) {
break;
}
// Issue an extract_subreg to get the lower 32-bits.
unsigned Reg32 = FastEmitInst_extractsubreg(MVT::i32, SrcReg, /*Kill=*/true,
unsigned Reg32 = FastEmitInst_extractsubreg(MVT::i32, SrcReg, SrcIsKill,
AArch64::sub_32);
MRI.constrainRegClass(Reg32, &AArch64::GPR32RegClass);
// Create the AND instruction which performs the actual truncation.
unsigned ANDReg = createResultReg(&AArch64::GPR32spRegClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ANDWri),
ANDReg)
.addReg(Reg32)
.addImm(AArch64_AM::encodeLogicalImmediate(Mask, 32));
unsigned ANDReg = emitAND_ri(MVT::i32, Reg32, /*IsKill=*/true, Mask);
assert(ANDReg && "Unexpected AND instruction emission failure.");
SrcReg = ANDReg;
}
@ -2554,13 +2567,8 @@ unsigned AArch64FastISel::Emiti1Ext(unsigned SrcReg, MVT DestVT, bool isZExt) {
DestVT = MVT::i32;
if (isZExt) {
MRI.constrainRegClass(SrcReg, &AArch64::GPR32RegClass);
unsigned ResultReg = createResultReg(&AArch64::GPR32spRegClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ANDWri),
ResultReg)
.addReg(SrcReg)
.addImm(AArch64_AM::encodeLogicalImmediate(1, 32));
unsigned ResultReg = emitAND_ri(MVT::i32, SrcReg, /*TODO:IsKill=*/false, 1);
assert(ResultReg && "Unexpected AND instruction emission failure.");
if (DestVT == MVT::i64) {
// We're ZExt i1 to i64. The ANDWri Wd, Ws, #1 implicitly clears the
// upper 32 bits. Emit a SUBREG_TO_REG to extend from Wd to Xd.