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[AIX] TOC pseudo expansion for 64bit large + 64bit small + 32bit large models

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This patch provides support for peudo ops including ADDIStocHA8, ADDIStocHA, LWZtocL,
LDtoc, LDtocL for AIX, lowering them from MIR to assembly.

Differential Revision: https://reviews.llvm.org/D68341

llvm-svn: 375113
This commit is contained in:
Xiangling Liao 2019-10-17 13:20:25 +00:00
parent 1fb9c274aa
commit 6a814b2152
7 changed files with 194 additions and 23 deletions
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2
include/llvm/MC/MCExpr.h
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@ -235,6 +235,8 @@ public:
VK_PPC_TOC_LO, // symbol@toc@l
VK_PPC_TOC_HI, // symbol@toc@h
VK_PPC_TOC_HA, // symbol@toc@ha
VK_PPC_U, // symbol@u
VK_PPC_L, // symbol@l
VK_PPC_DTPMOD, // symbol@dtpmod
VK_PPC_TPREL_LO, // symbol@tprel@l
VK_PPC_TPREL_HI, // symbol@tprel@h

4
lib/MC/MCExpr.cpp
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@ -259,6 +259,8 @@ StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) {
case VK_PPC_TOC_LO: return "toc@l";
case VK_PPC_TOC_HI: return "toc@h";
case VK_PPC_TOC_HA: return "toc@ha";
case VK_PPC_U: return "u";
case VK_PPC_L: return "l";
case VK_PPC_DTPMOD: return "dtpmod";
case VK_PPC_TPREL_LO: return "tprel@l";
case VK_PPC_TPREL_HI: return "tprel@h";
@ -373,6 +375,8 @@ MCSymbolRefExpr::getVariantKindForName(StringRef Name) {
.Case("toc@l", VK_PPC_TOC_LO)
.Case("toc@h", VK_PPC_TOC_HI)
.Case("toc@ha", VK_PPC_TOC_HA)
.Case("u", VK_PPC_U)
.Case("l", VK_PPC_L)
.Case("tls", VK_PPC_TLS)
.Case("dtpmod", VK_PPC_DTPMOD)
.Case("tprel@l", VK_PPC_TPREL_LO)

25
lib/Target/PowerPC/MCTargetDesc/PPCInstPrinter.cpp
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@ -66,6 +66,31 @@ void PPCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
void PPCInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
StringRef Annot, const MCSubtargetInfo &STI) {
// Customize printing of the addis instruction on AIX. When an operand is a
// symbol reference, the instruction syntax is changed to look like a load
// operation, i.e:
// Transform: addis $rD, $rA, $src --> addis $rD, $src($rA).
if (TT.isOSAIX() &&
(MI->getOpcode() == PPC::ADDIS8 || MI->getOpcode() == PPC::ADDIS) &&
MI->getOperand(2).isExpr()) {
assert((MI->getOperand(0).isReg() && MI->getOperand(1).isReg()) &&
"The first and the second operand of an addis instruction"
" should be registers.");
assert(isa<MCSymbolRefExpr>(MI->getOperand(2).getExpr()) &&
"The third operand of an addis instruction should be a symbol "
"reference expression if it is an expression at all.");
O << "\taddis ";
printOperand(MI, 0, O);
O << ", ";
printOperand(MI, 2, O);
O << "(";
printOperand(MI, 1, O);
O << ")";
return;
}
// Check for slwi/srwi mnemonics.
if (MI->getOpcode() == PPC::RLWINM) {
unsigned char SH = MI->getOperand(2).getImm();

92
lib/Target/PowerPC/PPCAsmPrinter.cpp
View File

@ -536,6 +536,8 @@ static MCSymbol *getMCSymbolForTOCPseudoMO(const MachineOperand &MO,
void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
MCInst TmpInst;
const bool IsDarwin = TM.getTargetTriple().isOSDarwin();
const bool IsPPC64 = Subtarget->isPPC64();
const bool IsAIX = Subtarget->isAIXABI();
const Module *M = MF->getFunction().getParent();
PICLevel::Level PL = M->getPICLevel();
@ -683,11 +685,10 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
const MachineOperand &MO = MI->getOperand(1);
assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
"Unexpected operand type for LWZtoc pseudo.");
"Invalid operand for LWZtoc.");
// Map the operand to its corresponding MCSymbol.
const MCSymbol *const MOSymbol = getMCSymbolForTOCPseudoMO(MO, *this);
const bool IsAIX = TM.getTargetTriple().isOSAIX();
// Create a reference to the GOT entry for the symbol. The GOT entry will be
// synthesized later.
@ -700,7 +701,7 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
return;
}
// Otherwise use the TOC. 'TOCEntry' is a label used to reference the
// Otherwise, use the TOC. 'TOCEntry' is a label used to reference the
// storage allocated in the TOC which contains the address of
// 'MOSymbol'. Said TOC entry will be synthesized later.
MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
@ -732,6 +733,8 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
case PPC::LDtocCPT:
case PPC::LDtocBA:
case PPC::LDtoc: {
assert(!IsDarwin && "TOC is an ELF/XCOFF construct");
// Transform %x3 = LDtoc @min1, %x2
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
@ -748,15 +751,77 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
MCSymbol *TOCEntry =
lookUpOrCreateTOCEntry(getMCSymbolForTOCPseudoMO(MO, *this));
const MCSymbolRefExpr::VariantKind VK =
IsAIX ? MCSymbolRefExpr::VK_None : MCSymbolRefExpr::VK_PPC_TOC;
const MCExpr *Exp =
MCSymbolRefExpr::create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
OutContext);
MCSymbolRefExpr::create(TOCEntry, VK, OutContext);
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::ADDIStocHA: {
assert((IsAIX && !IsPPC64 && TM.getCodeModel() == CodeModel::Large) &&
"This pseudo should only be selected for 32-bit large code model on"
" AIX.");
// Transform %rd = ADDIStocHA %rA, @sym(%r2)
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
// Change the opcode to ADDIS.
TmpInst.setOpcode(PPC::ADDIS);
const MachineOperand &MO = MI->getOperand(2);
assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
"Invalid operand for ADDIStocHA.");
// Map the machine operand to its corresponding MCSymbol.
MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO, *this);
// Always use TOC on AIX. Map the global address operand to be a reference
// to the TOC entry we will synthesize later. 'TOCEntry' is a label used to
// reference the storage allocated in the TOC which contains the address of
// 'MOSymbol'.
MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
const MCExpr *Exp = MCSymbolRefExpr::create(TOCEntry,
MCSymbolRefExpr::VK_PPC_U,
OutContext);
TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::LWZtocL: {
assert(IsAIX && !IsPPC64 && TM.getCodeModel() == CodeModel::Large &&
"This pseudo should only be selected for 32-bit large code model on"
" AIX.");
// Transform %rd = LWZtocL @sym, %rs.
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
// Change the opcode to lwz.
TmpInst.setOpcode(PPC::LWZ);
const MachineOperand &MO = MI->getOperand(1);
assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
"Invalid operand for LWZtocL.");
// Map the machine operand to its corresponding MCSymbol.
MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO, *this);
// Always use TOC on AIX. Map the global address operand to be a reference
// to the TOC entry we will synthesize later. 'TOCEntry' is a label used to
// reference the storage allocated in the TOC which contains the address of
// 'MOSymbol'.
MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
const MCExpr *Exp = MCSymbolRefExpr::create(TOCEntry,
MCSymbolRefExpr::VK_PPC_L,
OutContext);
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::ADDIStocHA8: {
assert(!IsDarwin && "TOC is an ELF/XCOFF construct");
// Transform %xd = ADDIStocHA8 %x2, @sym
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
@ -778,9 +843,11 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
(MO.isCPI() && TM.getCodeModel() == CodeModel::Large))
MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
const MCSymbolRefExpr::VariantKind VK =
IsAIX ? MCSymbolRefExpr::VK_PPC_U : MCSymbolRefExpr::VK_PPC_TOC_HA;
const MCExpr *Exp =
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
OutContext);
MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
if (!MO.isJTI() && MO.getOffset())
Exp = MCBinaryExpr::createAdd(Exp,
@ -793,6 +860,8 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
return;
}
case PPC::LDtocL: {
assert(!IsDarwin && "TOC is an ELF/XCOFF construct");
// Transform %xd = LDtocL @sym, %xs
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
@ -817,9 +886,10 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
if (!MO.isCPI() || TM.getCodeModel() == CodeModel::Large)
MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
const MCSymbolRefExpr::VariantKind VK =
IsAIX ? MCSymbolRefExpr::VK_PPC_L : MCSymbolRefExpr::VK_PPC_TOC_LO;
const MCExpr *Exp =
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
OutContext);
MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
@ -855,8 +925,8 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymGotTprel =
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
OutContext);
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg())

1
lib/Target/PowerPC/PPCInstrInfo.cpp
View File

@ -328,6 +328,7 @@ bool PPCInstrInfo::isReallyTriviallyReMaterializable(const MachineInstr &MI,
case PPC::LIS:
case PPC::LIS8:
case PPC::QVGPCI:
case PPC::ADDIStocHA:
case PPC::ADDIStocHA8:
case PPC::ADDItocL:
case PPC::LOAD_STACK_GUARD:

48
test/CodeGen/PowerPC/lower-globaladdr32-aix-asm.ll
View File

@ -1,21 +1,45 @@
; RUN: llc -mtriple powerpc-ibm-aix-xcoff \
; RUN: -code-model=small < %s | FileCheck %s
; RUN: llc -verify-machineinstrs -mcpu=pwr7 -mtriple powerpc-ibm-aix-xcoff \
; RUN: -code-model=small < %s | FileCheck %s --check-prefixes=CHECK,SMALL
; RUN: llc -verify-machineinstrs -mcpu=pwr7 -mtriple powerpc-ibm-aix-xcoff \
; RUN: -code-model=large < %s | FileCheck %s --check-prefixes=CHECK,LARGE
@b = common global i32 0
@a = common global i32 0
define void @test() {
%1 = load i32, i32* @b
store i32 %1, i32* @a
define i32 @test_load() {
entry:
%0 = load i32, i32* @a
ret i32 %0
}
; SMALL-LABEL: .test_load:{{$}}
; SMALL: lwz [[REG1:[0-9]+]], LC0(2)
; SMALL: lwz [[REG2:[0-9]+]], 0([[REG1]])
; SMALL: blr
; LARGE-LABEL: .test_load:{{$}}
; LARGE: addis [[REG1:[0-9]+]], LC0@u(2)
; LARGE: lwz [[REG2:[0-9]+]], LC0@l([[REG1]])
; LARGE: lwz [[REG3:[0-9]+]], 0([[REG2]])
; LARGE: blr
@b = common global i32 0
define void @test_store(i32 %0) {
store i32 %0, i32* @b
ret void
}
; CHECK-LABEL: test
; CHECK-DAG: lwz [[REG1:[0-9]+]], LC0(2)
; CHECK-DAG: lwz [[REG2:[0-9]+]], LC1(2)
; CHECK-DAG: lwz [[REG3:[0-9]+]], 0([[REG1]])
; CHECK: stw [[REG3]], 0([[REG2]])
; CHECK: blr
; SMALL-LABEL: .test_store:{{$}}
; SMALL: lwz [[REG1:[0-9]+]], LC1(2)
; SMALL: stw [[REG2:[0-9]+]], 0([[REG1]])
; SMALL: blr
; LARGE-LABEL: .test_store:{{$}}
; LARGE: addis [[REG1:[0-9]+]], LC1@u(2)
; LARGE: lwz [[REG2:[0-9]+]], LC1@l([[REG1]])
; LARGE: stw [[REG3:[0-9]+]], 0([[REG2]])
; LARGE: blr
; TODO Update test when TOC-entry emission lands.
; CHECK-NOT: .tc

45
test/CodeGen/PowerPC/lower-globaladdr64-aix-asm.ll Normal file
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@ -0,0 +1,45 @@
; RUN: llc -verify-machineinstrs -mcpu=pwr7 -mtriple powerpc64-ibm-aix-xcoff \
; RUN: -code-model=small < %s | FileCheck %s --check-prefixes=CHECK,SMALL
; RUN: llc -verify-machineinstrs -mcpu=pwr7 -mtriple powerpc64-ibm-aix-xcoff \
; RUN: -code-model=large < %s | FileCheck %s --check-prefixes=CHECK,LARGE
@a = common global i32 0
define zeroext i32 @test_load() {
entry:
%0 = load i32, i32* @a
ret i32 %0
}
; SMALL-LABEL: .test_load:{{$}}
; SMALL: ld [[REG1:[0-9]+]], LC0(2)
; SMALL: lwz [[REG2:[0-9]+]], 0([[REG1]])
; SMALL: blr
; LARGE-LABEL: .test_load:{{$}}
; LARGE: addis [[REG1:[0-9]+]], LC0@u(2)
; LARGE: ld [[REG2:[0-9]+]], LC0@l([[REG1]])
; LARGE: lwz [[REG3:[0-9]+]], 0([[REG2]])
; LARGE: blr
@b = common global i32 0
define void @test_store(i32 zeroext %0) {
store i32 %0, i32* @b
ret void
}
; SMALL-LABEL: .test_store:{{$}}
; SMALL: ld [[REG1:[0-9]+]], LC1(2)
; SMALL: stw [[REG2:[0-9]+]], 0([[REG1]])
; SMALL: blr
; LARGE-LABEL: .test_store:{{$}}
; LARGE: addis [[REG1:[0-9]+]], LC1@u(2)
; LARGE: ld [[REG2:[0-9]+]], LC1@l([[REG1]])
; LARGE: stw [[REG3:[0-9]+]], 0([[REG2]])
; LARGE: blr
; TODO Update test when TOC-entry emission lands.
; CHECK-NOT: .tc