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[SystemZ] Use upper words of GR64s for codegen

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This just adds the basics necessary for allocating the upper words to
virtual registers (move, load and store).  The move support is parameterised
in a way that makes it easy to handle zero extensions, but the associated
zero-extend patterns are added by a later patch.

The easiest way of testing this seemed to be add a new "h" register
constraint for high words.  I don't expect the constraint to be useful
in real inline asms, but it should work, so I didn't try to hide it
behind an option.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191739 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Sandiford 2013-10-01 11:26:28 +00:00
parent 7d0b89bedd
commit 55d7d83b6c
11 changed files with 236 additions and 13 deletions
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5
lib/Target/SystemZ/AsmParser/SystemZAsmParser.cpp
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@ -264,6 +264,7 @@ public:
// Used by the TableGen code to check for particular operand types.
bool isGR32() const { return isReg(GR32Reg); }
bool isGRH32() const { return isReg(GRH32Reg); }
bool isGRX32() const { return false; }
bool isGR64() const { return isReg(GR64Reg); }
bool isGR128() const { return isReg(GR128Reg); }
bool isADDR32() const { return isReg(ADDR32Reg); }
@ -362,6 +363,10 @@ public:
return parseRegister(Operands, RegGR, SystemZMC::GRH32Regs, GRH32Reg);
}
OperandMatchResultTy
parseGRX32(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
llvm_unreachable("GRX32 should only be used for pseudo instructions");
}
OperandMatchResultTy
parseGR64(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
return parseRegister(Operands, RegGR, SystemZMC::GR64Regs, GR64Reg);
}

1
lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp
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@ -82,6 +82,7 @@ unsigned SystemZMC::getFirstReg(unsigned Reg) {
if (!Initialized) {
for (unsigned I = 0; I < 16; ++I) {
Map[GR32Regs[I]] = I;
Map[GRH32Regs[I]] = I;
Map[GR64Regs[I]] = I;
Map[GR128Regs[I]] = I;
Map[FP32Regs[I]] = I;

22
lib/Target/SystemZ/SystemZAsmPrinter.cpp
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@ -35,6 +35,18 @@ static MCInst lowerRILow(const MachineInstr *MI, unsigned Opcode) {
.addImm(MI->getOperand(2).getImm());
}
// Return an RI instruction like MI with opcode Opcode, but with the
// R2 register turned into a GR64.
static MCInst lowerRIEfLow(const MachineInstr *MI, unsigned Opcode) {
return MCInstBuilder(Opcode)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg())
.addReg(SystemZMC::getRegAsGR64(MI->getOperand(2).getReg()))
.addImm(MI->getOperand(3).getImm())
.addImm(MI->getOperand(4).getImm())
.addImm(MI->getOperand(5).getImm());
}
void SystemZAsmPrinter::EmitInstruction(const MachineInstr *MI) {
SystemZMCInstLower Lower(Mang, MF->getContext(), *this);
MCInst LoweredMI;
@ -70,6 +82,16 @@ void SystemZAsmPrinter::EmitInstruction(const MachineInstr *MI) {
.addImm(MI->getOperand(2).getImm());
break;
case SystemZ::RISBHH:
case SystemZ::RISBHL:
LoweredMI = lowerRIEfLow(MI, SystemZ::RISBHG);
break;
case SystemZ::RISBLH:
case SystemZ::RISBLL:
LoweredMI = lowerRIEfLow(MI, SystemZ::RISBLG);
break;
#define LOWER_LOW(NAME) \
case SystemZ::NAME##64: LoweredMI = lowerRILow(MI, SystemZ::NAME); break

10
lib/Target/SystemZ/SystemZISelLowering.cpp
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@ -51,6 +51,9 @@ SystemZTargetLowering::SystemZTargetLowering(SystemZTargetMachine &tm)
MVT PtrVT = getPointerTy();
// Set up the register classes.
if (Subtarget.hasHighWord())
addRegisterClass(MVT::i32, &SystemZ::GRX32BitRegClass);
else
addRegisterClass(MVT::i32, &SystemZ::GR32BitRegClass);
addRegisterClass(MVT::i64, &SystemZ::GR64BitRegClass);
addRegisterClass(MVT::f32, &SystemZ::FP32BitRegClass);
@ -338,6 +341,7 @@ SystemZTargetLowering::getConstraintType(const std::string &Constraint) const {
case 'a': // Address register
case 'd': // Data register (equivalent to 'r')
case 'f': // Floating-point register
case 'h': // High-part register
case 'r': // General-purpose register
return C_RegisterClass;
@ -380,6 +384,7 @@ getSingleConstraintMatchWeight(AsmOperandInfo &info,
case 'a': // Address register
case 'd': // Data register (equivalent to 'r')
case 'h': // High-part register
case 'r': // General-purpose register
if (CallOperandVal->getType()->isIntegerTy())
weight = CW_Register;
@ -460,6 +465,9 @@ getRegForInlineAsmConstraint(const std::string &Constraint, MVT VT) const {
return std::make_pair(0U, &SystemZ::ADDR128BitRegClass);
return std::make_pair(0U, &SystemZ::ADDR32BitRegClass);
case 'h': // High-part register (an LLVM extension)
return std::make_pair(0U, &SystemZ::GRH32BitRegClass);
case 'f': // Floating-point register
if (VT == MVT::f64)
return std::make_pair(0U, &SystemZ::FP64BitRegClass);
@ -733,7 +741,7 @@ static bool canUseSiblingCall(CCState ArgCCInfo,
if (!VA.isRegLoc())
return false;
unsigned Reg = VA.getLocReg();
if (Reg == SystemZ::R6L || Reg == SystemZ::R6D)
if (Reg == SystemZ::R6H || Reg == SystemZ::R6L || Reg == SystemZ::R6D)
return false;
}
return true;

41
lib/Target/SystemZ/SystemZInstrFormats.td
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@ -1349,6 +1349,40 @@ class Pseudo<dag outs, dag ins, list<dag> pattern>
let isCodeGenOnly = 1;
}
// Like UnaryRXY, but expanded after RA depending on the choice of registers.
class UnaryRXYPseudo<string key, SDPatternOperator operator,
RegisterOperand cls, bits<5> bytes,
AddressingMode mode = bdxaddr20only>
: Pseudo<(outs cls:$R1), (ins mode:$XBD2),
[(set cls:$R1, (operator mode:$XBD2))]> {
let OpKey = key ## cls;
let OpType = "mem";
let mayLoad = 1;
let Has20BitOffset = 1;
let HasIndex = 1;
let AccessBytes = bytes;
}
// Like UnaryRR, but expanded after RA depending on the choice of registers.
class UnaryRRPseudo<string key, SDPatternOperator operator,
RegisterOperand cls1, RegisterOperand cls2>
: Pseudo<(outs cls1:$R1), (ins cls2:$R2),
[(set cls1:$R1, (operator cls2:$R2))]> {
let OpKey = key ## cls1;
let OpType = "reg";
}
// Like StoreRXY, but expanded after RA depending on the choice of registers.
class StoreRXYPseudo<SDPatternOperator operator, RegisterOperand cls,
bits<5> bytes, AddressingMode mode = bdxaddr20only>
: Pseudo<(outs), (ins cls:$R1, mode:$XBD2),
[(operator cls:$R1, mode:$XBD2)]> {
let mayStore = 1;
let Has20BitOffset = 1;
let HasIndex = 1;
let AccessBytes = bytes;
}
// Implements "$dst = $cc & (8 >> CC) ? $src1 : $src2", where CC is
// the value of the PSW's 2-bit condition code field.
class SelectWrapper<RegisterOperand cls>
@ -1493,3 +1527,10 @@ class BinaryAliasRIL<SDPatternOperator operator, RegisterOperand cls,
[(set cls:$R1, (operator cls:$R1src, imm:$I2))]> {
let Constraints = "$R1 = $R1src";
}
// An alias of a RotateSelectRIEf, but with different register sizes.
class RotateSelectAliasRIEf<RegisterOperand cls1, RegisterOperand cls2>
: Alias<6, (outs cls1:$R1),
(ins cls1:$R1src, cls2:$R2, uimm8:$I3, uimm8:$I4, uimm8zx6:$I5), []> {
let Constraints = "$R1 = $R1src";
}

78
lib/Target/SystemZ/SystemZInstrInfo.cpp
View File

@ -28,6 +28,15 @@ static uint64_t allOnes(unsigned int Count) {
return Count == 0 ? 0 : (uint64_t(1) << (Count - 1) << 1) - 1;
}
// Reg should be a 32-bit GPR. Return true if it is a high register rather
// than a low register.
static bool isHighReg(unsigned int Reg) {
if (SystemZ::GRH32BitRegClass.contains(Reg))
return true;
assert(SystemZ::GR32BitRegClass.contains(Reg) && "Invalid GRX32");
return false;
}
SystemZInstrInfo::SystemZInstrInfo(SystemZTargetMachine &tm)
: SystemZGenInstrInfo(SystemZ::ADJCALLSTACKDOWN, SystemZ::ADJCALLSTACKUP),
RI(tm), TM(tm) {
@ -82,6 +91,48 @@ void SystemZInstrInfo::splitAdjDynAlloc(MachineBasicBlock::iterator MI) const {
OffsetMO.setImm(Offset);
}
// MI is an RXY-style pseudo instruction. Replace it with LowOpcode
// if the first operand is a low GR32 and HighOpcode if the first operand
// is a high GR32.
void SystemZInstrInfo::expandRXYPseudo(MachineInstr *MI, unsigned LowOpcode,
unsigned HighOpcode) const {
unsigned Reg = MI->getOperand(0).getReg();
unsigned Opcode = getOpcodeForOffset(isHighReg(Reg) ? HighOpcode : LowOpcode,
MI->getOperand(2).getImm());
MI->setDesc(get(Opcode));
}
// Emit a zero-extending move from 32-bit GPR SrcReg to 32-bit GPR
// DestReg before MBBI in MBB. Use LowLowOpcode when both DestReg and SrcReg
// are low registers, otherwise use RISB[LH]G. Size is the number of bits
// taken from the low end of SrcReg (8 for LLCR, 16 for LLHR and 32 for LR).
// KillSrc is true if this move is the last use of SrcReg.
void SystemZInstrInfo::emitGRX32Move(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
DebugLoc DL, unsigned DestReg,
unsigned SrcReg, unsigned LowLowOpcode,
unsigned Size, bool KillSrc) const {
unsigned Opcode;
bool DestIsHigh = isHighReg(DestReg);
bool SrcIsHigh = isHighReg(SrcReg);
if (DestIsHigh && SrcIsHigh)
Opcode = SystemZ::RISBHH;
else if (DestIsHigh && !SrcIsHigh)
Opcode = SystemZ::RISBHL;
else if (!DestIsHigh && SrcIsHigh)
Opcode = SystemZ::RISBLH;
else {
BuildMI(MBB, MBBI, DL, get(LowLowOpcode), DestReg)
.addReg(SrcReg, getKillRegState(KillSrc));
return;
}
unsigned Rotate = (DestIsHigh != SrcIsHigh ? 32 : 0);
BuildMI(MBB, MBBI, DL, get(Opcode), DestReg)
.addReg(DestReg, RegState::Undef)
.addReg(SrcReg, getKillRegState(KillSrc))
.addImm(32 - Size).addImm(128 + 31).addImm(Rotate);
}
// If MI is a simple load or store for a frame object, return the register
// it loads or stores and set FrameIndex to the index of the frame object.
// Return 0 otherwise.
@ -460,11 +511,14 @@ SystemZInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
return;
}
if (SystemZ::GRX32BitRegClass.contains(DestReg, SrcReg)) {
emitGRX32Move(MBB, MBBI, DL, DestReg, SrcReg, SystemZ::LR, 32, KillSrc);
return;
}
// Everything else needs only one instruction.
unsigned Opcode;
if (SystemZ::GR32BitRegClass.contains(DestReg, SrcReg))
Opcode = SystemZ::LR;
else if (SystemZ::GR64BitRegClass.contains(DestReg, SrcReg))
if (SystemZ::GR64BitRegClass.contains(DestReg, SrcReg))
Opcode = SystemZ::LGR;
else if (SystemZ::FP32BitRegClass.contains(DestReg, SrcReg))
Opcode = SystemZ::LER;
@ -601,7 +655,7 @@ SystemZInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
if (And.RegSize == 64)
NewOpcode = SystemZ::RISBG;
else if (TM.getSubtargetImpl()->hasHighWord())
NewOpcode = SystemZ::RISBLG32;
NewOpcode = SystemZ::RISBLL;
else
// We can't use RISBG for 32-bit operations because it clobbers the
// high word of the destination too.
@ -612,7 +666,7 @@ SystemZInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
Imm |= allOnes(And.RegSize) & ~(allOnes(And.ImmSize) << And.ImmLSB);
unsigned Start, End;
if (isRxSBGMask(Imm, And.RegSize, Start, End)) {
if (NewOpcode == SystemZ::RISBLG32) {
if (NewOpcode == SystemZ::RISBLL) {
Start &= 31;
End &= 31;
}
@ -752,6 +806,14 @@ SystemZInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const {
splitMove(MI, SystemZ::STD);
return true;
case SystemZ::LMux:
expandRXYPseudo(MI, SystemZ::L, SystemZ::LFH);
return true;
case SystemZ::STMux:
expandRXYPseudo(MI, SystemZ::ST, SystemZ::STFH);
return true;
case SystemZ::ADJDYNALLOC:
splitAdjDynAlloc(MI);
return true;
@ -824,6 +886,12 @@ void SystemZInstrInfo::getLoadStoreOpcodes(const TargetRegisterClass *RC,
if (RC == &SystemZ::GR32BitRegClass || RC == &SystemZ::ADDR32BitRegClass) {
LoadOpcode = SystemZ::L;
StoreOpcode = SystemZ::ST;
} else if (RC == &SystemZ::GRH32BitRegClass) {
LoadOpcode = SystemZ::LFH;
StoreOpcode = SystemZ::STFH;
} else if (RC == &SystemZ::GRX32BitRegClass) {
LoadOpcode = SystemZ::LMux;
StoreOpcode = SystemZ::STMux;
} else if (RC == &SystemZ::GR64BitRegClass ||
RC == &SystemZ::ADDR64BitRegClass) {
LoadOpcode = SystemZ::LG;

5
lib/Target/SystemZ/SystemZInstrInfo.h
View File

@ -116,6 +116,11 @@ class SystemZInstrInfo : public SystemZGenInstrInfo {
void splitMove(MachineBasicBlock::iterator MI, unsigned NewOpcode) const;
void splitAdjDynAlloc(MachineBasicBlock::iterator MI) const;
void expandRXYPseudo(MachineInstr *MI, unsigned LowOpcode,
unsigned HighOpcode) const;
void emitGRX32Move(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
DebugLoc DL, unsigned DestReg, unsigned SrcReg,
unsigned LowLowOpcode, unsigned Size, bool KillSrc) const;
public:
explicit SystemZInstrInfo(SystemZTargetMachine &TM);

18
lib/Target/SystemZ/SystemZInstrInfo.td
View File

@ -254,6 +254,9 @@ def BASR : InstRR<0x0D, (outs), (ins GR64:$R1, ADDR64:$R2),
// Register moves.
let neverHasSideEffects = 1 in {
// Expands to LR, RISBHG or RISBLG, depending on the choice of registers.
def LRMux : UnaryRRPseudo<"l", null_frag, GRX32, GRX32>,
Requires<[FeatureHighWord]>;
def LR : UnaryRR <"l", 0x18, null_frag, GR32, GR32>;
def LGR : UnaryRRE<"lg", 0xB904, null_frag, GR64, GR64>;
}
@ -293,6 +296,9 @@ let neverHasSideEffects = 1, isAsCheapAsAMove = 1, isMoveImm = 1,
// Register loads.
let canFoldAsLoad = 1, SimpleBDXLoad = 1 in {
// Expands to L, LY or LFH, depending on the choice of register.
def LMux : UnaryRXYPseudo<"l", load, GRX32, 4>,
Requires<[FeatureHighWord]>;
defm L : UnaryRXPair<"l", 0x58, 0xE358, load, GR32, 4>;
def LFH : UnaryRXY<"lfh", 0xE3CA, load, GRH32, 4>,
Requires<[FeatureHighWord]>;
@ -327,6 +333,9 @@ let Uses = [CC] in {
// Register stores.
let SimpleBDXStore = 1 in {
// Expands to ST, STY or STFH, depending on the choice of register.
def STMux : StoreRXYPseudo<store, GRX32, 4>,
Requires<[FeatureHighWord]>;
defm ST : StoreRXPair<"st", 0x50, 0xE350, store, GR32, 4>;
def STFH : StoreRXY<"stfh", 0xE3CB, store, GRH32, 4>,
Requires<[FeatureHighWord]>;
@ -929,13 +938,14 @@ let Defs = [CC] in {
// Forms of RISBG that only affect one word of the destination register.
// They do not set CC.
let isCodeGenOnly = 1 in
def RISBLG32 : RotateSelectRIEf<"risblg", 0xEC51, GR32, GR32>,
def RISBLL : RotateSelectAliasRIEf<GR32, GR32>, Requires<[FeatureHighWord]>;
def RISBLH : RotateSelectAliasRIEf<GR32, GRH32>, Requires<[FeatureHighWord]>;
def RISBHL : RotateSelectAliasRIEf<GRH32, GR32>, Requires<[FeatureHighWord]>;
def RISBHH : RotateSelectAliasRIEf<GRH32, GRH32>, Requires<[FeatureHighWord]>;
def RISBLG : RotateSelectRIEf<"risblg", 0xEC51, GR32, GR64>,
Requires<[FeatureHighWord]>;
def RISBHG : RotateSelectRIEf<"risbhg", 0xEC5D, GRH32, GR64>,
Requires<[FeatureHighWord]>;
def RISBLG : RotateSelectRIEf<"risblg", 0xEC51, GR32, GR64>,
Requires<[FeatureHighWord]>;
// Rotate second operand left and perform a logical operation with selected
// bits of the first operand. The CC result only describes the selected bits,

2
lib/Target/SystemZ/SystemZRegisterInfo.cpp
View File

@ -43,12 +43,14 @@ SystemZRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
// R11D is the frame pointer. Reserve all aliases.
Reserved.set(SystemZ::R11D);
Reserved.set(SystemZ::R11L);
Reserved.set(SystemZ::R11H);
Reserved.set(SystemZ::R10Q);
}
// R15D is the stack pointer. Reserve all aliases.
Reserved.set(SystemZ::R15D);
Reserved.set(SystemZ::R15L);
Reserved.set(SystemZ::R15H);
Reserved.set(SystemZ::R14Q);
return Reserved;
}

9
lib/Target/SystemZ/SystemZRegisterInfo.td
View File

@ -91,6 +91,15 @@ defm GRH32 : SystemZRegClass<"GRH32", i32, 32, (add (sequence "R%uH", 0, 5),
defm GR64 : SystemZRegClass<"GR64", i64, 64, (add (sequence "R%uD", 0, 5),
(sequence "R%uD", 15, 6))>;
// Combine the low and high GR32s into a single class. This can only be
// used for virtual registers if the high-word facility is available.
defm GRX32 : SystemZRegClass<"GRX32", i32, 32,
(add (sequence "R%uL", 0, 5),
(sequence "R%uH", 0, 5),
R15L, R15H, R14L, R14H, R13L, R13H,
R12L, R12H, R11L, R11H, R10L, R10H,
R9L, R9H, R8L, R8H, R7L, R7H, R6L, R6H)>;
// The architecture doesn't really have any i128 support, so model the
// register pairs as untyped instead.
defm GR128 : SystemZRegClass<"GR128", untyped, 128, (add R0Q, R2Q, R4Q,

52
test/CodeGen/SystemZ/asm-18.ll Normal file
View File

@ -0,0 +1,52 @@
; Test high-word operations, using "h" constraints to force a high
; register and "r" constraints to force a low register.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
; Test loads and stores involving mixtures of high and low registers.
define void @f1(i32 *%ptr1, i32 *%ptr2) {
; CHECK-LABEL: f1:
; CHECK-DAG: lfh [[REG1:%r[0-5]]], 0(%r2)
; CHECK-DAG: l [[REG2:%r[0-5]]], 0(%r3)
; CHECK-DAG: lfh [[REG3:%r[0-5]]], 4096(%r2)
; CHECK-DAG: ly [[REG4:%r[0-5]]], 524284(%r3)
; CHECK: blah [[REG1]], [[REG2]], [[REG3]], [[REG4]]
; CHECK-DAG: stfh [[REG1]], 0(%r2)
; CHECK-DAG: st [[REG2]], 0(%r3)
; CHECK-DAG: stfh [[REG3]], 4096(%r2)
; CHECK-DAG: sty [[REG4]], 524284(%r3)
; CHECK: br %r14
%ptr3 = getelementptr i32 *%ptr1, i64 1024
%ptr4 = getelementptr i32 *%ptr2, i64 131071
%old1 = load i32 *%ptr1
%old2 = load i32 *%ptr2
%old3 = load i32 *%ptr3
%old4 = load i32 *%ptr4
%res = call { i32, i32, i32, i32 } asm "blah $0, $1, $2, $3",
"=h,=r,=h,=r,0,1,2,3"(i32 %old1, i32 %old2, i32 %old3, i32 %old4)
%new1 = extractvalue { i32, i32, i32, i32 } %res, 0
%new2 = extractvalue { i32, i32, i32, i32 } %res, 1
%new3 = extractvalue { i32, i32, i32, i32 } %res, 2
%new4 = extractvalue { i32, i32, i32, i32 } %res, 3
store i32 %new1, i32 *%ptr1
store i32 %new2, i32 *%ptr2
store i32 %new3, i32 *%ptr3
store i32 %new4, i32 *%ptr4
ret void
}
; Test moves involving mixtures of high and low registers.
define i32 @f2(i32 %old) {
; CHECK-LABEL: f2:
; CHECK-DAG: risbhg [[REG1:%r[0-5]]], %r2, 0, 159, 32
; CHECK-DAG: lr %r3, %r2
; CHECK: stepa [[REG1]], %r2, %r3
; CHECK: risbhg {{%r[0-5]}}, [[REG1]], 0, 159, 0
; CHECK: stepb [[REG2:%r[0-5]]]
; CHECK: risblg %r2, [[REG2]], 0, 159, 32
; CHECK: br %r14
%tmp = call i32 asm "stepa $1, $2, $3",
"=h,0,{r2},{r3}"(i32 %old, i32 %old, i32 %old)
%new = call i32 asm "stepb $1, $2", "=&h,0,h"(i32 %tmp, i32 %tmp)
ret i32 %new
}