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Consolidate reg-imm / reg-reg-imm address mode selection logic in one place.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75990 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2009-07-16 14:10:17 +00:00
parent 5a11e02fbd
commit 1ed1e3ecd4
5 changed files with 156 additions and 170 deletions
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280
lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
View File

@ -46,9 +46,10 @@ namespace {
SDValue IndexReg;
int64_t Disp;
bool isRI;
SystemZRRIAddressMode()
: BaseType(RegBase), IndexReg(), Disp(0) {
SystemZRRIAddressMode(bool RI = false)
: BaseType(RegBase), IndexReg(), Disp(0), isRI(RI) {
}
void dump() {
@ -61,9 +62,11 @@ namespace {
} else {
cerr << " Base.FrameIndex " << Base.FrameIndex << '\n';
}
cerr << "IndexReg ";
if (IndexReg.getNode() != 0) IndexReg.getNode()->dump();
else cerr << "nul";
if (!isRI) {
cerr << "IndexReg ";
if (IndexReg.getNode() != 0) IndexReg.getNode()->dump();
else cerr << "nul";
}
cerr << " Disp " << Disp << '\n';
}
};
@ -77,6 +80,8 @@ namespace {
SystemZTargetLowering &Lowering;
const SystemZSubtarget &Subtarget;
void getAddressOperandsRI(const SystemZRRIAddressMode &AM,
SDValue &Base, SDValue &Disp);
void getAddressOperands(const SystemZRRIAddressMode &AM,
SDValue &Base, SDValue &Disp,
SDValue &Index);
@ -109,9 +114,9 @@ namespace {
#include "SystemZGenDAGISel.inc"
private:
bool SelectAddrRI32(const SDValue& Op, SDValue& Addr,
bool SelectAddrRI12(SDValue Op, SDValue& Addr,
SDValue &Base, SDValue &Disp);
bool SelectAddrRI(const SDValue& Op, SDValue& Addr,
bool SelectAddrRI(SDValue Op, SDValue& Addr,
SDValue &Base, SDValue &Disp);
bool SelectAddrRRI12(SDValue Op, SDValue Addr,
SDValue &Base, SDValue &Disp, SDValue &Index);
@ -124,6 +129,8 @@ namespace {
bool MatchAddress(SDValue N, SystemZRRIAddressMode &AM,
bool is12Bit, unsigned Depth = 0);
bool MatchAddressBase(SDValue N, SystemZRRIAddressMode &AM);
bool MatchAddressRI(SDValue N, SystemZRRIAddressMode &AM,
bool is12Bit);
#ifndef NDEBUG
unsigned Indent;
@ -151,17 +158,6 @@ static bool isImmSExt20(int64_t Val, int64_t &Imm) {
return false;
}
static bool isImmSExt20(SDNode *N, int64_t &Imm) {
if (N->getOpcode() != ISD::Constant)
return false;
return isImmSExt20(cast<ConstantSDNode>(N)->getSExtValue(), Imm);
}
static bool isImmSExt20(SDValue Op, int64_t &Imm) {
return isImmSExt20(Op.getNode(), Imm);
}
/// isImmZExt12 - This method tests to see if the node is either a 32-bit
/// or 64-bit immediate, and if the value can be accurately represented as a
/// zero extension from a 12-bit value. If so, this returns true and the
@ -174,139 +170,6 @@ static bool isImmZExt12(int64_t Val, int64_t &Imm) {
return false;
}
static bool isImmZExt12(SDNode *N, int64_t &Imm) {
if (N->getOpcode() != ISD::Constant)
return false;
return isImmZExt12(cast<ConstantSDNode>(N)->getSExtValue(), Imm);
}
static bool isImmZExt12(SDValue Op, int64_t &Imm) {
return isImmZExt12(Op.getNode(), Imm);
}
/// Returns true if the address can be represented by a base register plus
/// an unsigned 12-bit displacement [r+imm].
bool SystemZDAGToDAGISel::SelectAddrRI32(const SDValue& Op, SDValue& Addr,
SDValue &Base, SDValue &Disp) {
// FIXME dl should come from parent load or store, not from address
DebugLoc dl = Addr.getDebugLoc();
MVT VT = Addr.getValueType();
if (Addr.getOpcode() == ISD::ADD) {
int64_t Imm = 0;
if (isImmZExt12(Addr.getOperand(1), Imm)) {
Disp = CurDAG->getTargetConstant(Imm, MVT::i64);
if (FrameIndexSDNode *FI =
dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
Base = CurDAG->getTargetFrameIndex(FI->getIndex(), VT);
} else {
Base = Addr.getOperand(0);
}
return true; // [r+i]
}
} else if (Addr.getOpcode() == ISD::OR) {
int64_t Imm = 0;
if (isImmZExt12(Addr.getOperand(1), Imm)) {
// If this is an or of disjoint bitfields, we can codegen this as an add
// (for better address arithmetic) if the LHS and RHS of the OR are
// provably disjoint.
APInt LHSKnownZero, LHSKnownOne;
CurDAG->ComputeMaskedBits(Addr.getOperand(0),
APInt::getAllOnesValue(Addr.getOperand(0)
.getValueSizeInBits()),
LHSKnownZero, LHSKnownOne);
if ((LHSKnownZero.getZExtValue()|~(uint64_t)Imm) == ~0ULL) {
// If all of the bits are known zero on the LHS or RHS, the add won't
// carry.
Base = Addr.getOperand(0);
Disp = CurDAG->getTargetConstant(Imm, MVT::i64);
return true;
}
}
} else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr)) {
// Loading from a constant address.
// If this address fits entirely in a 12-bit zext immediate field, codegen
// this as "d(r0)"
int64_t Imm;
if (isImmZExt12(CN, Imm)) {
Disp = CurDAG->getTargetConstant(Imm, MVT::i64);
Base = CurDAG->getRegister(0, VT);
return true;
}
}
Disp = CurDAG->getTargetConstant(0, MVT::i64);
if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Addr))
Base = CurDAG->getTargetFrameIndex(FI->getIndex(), VT);
else
Base = Addr;
return true; // [r+0]
}
/// Returns true if the address can be represented by a base register plus
/// a signed 20-bit displacement [r+imm].
bool SystemZDAGToDAGISel::SelectAddrRI(const SDValue& Op, SDValue& Addr,
SDValue &Base, SDValue &Disp) {
// FIXME dl should come from parent load or store, not from address
DebugLoc dl = Addr.getDebugLoc();
MVT VT = Addr.getValueType();
if (Addr.getOpcode() == ISD::ADD) {
int64_t Imm = 0;
if (isImmSExt20(Addr.getOperand(1), Imm)) {
Disp = CurDAG->getTargetConstant(Imm, MVT::i64);
if (FrameIndexSDNode *FI =
dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
Base = CurDAG->getTargetFrameIndex(FI->getIndex(), VT);
} else {
Base = Addr.getOperand(0);
}
return true; // [r+i]
}
} else if (Addr.getOpcode() == ISD::OR) {
int64_t Imm = 0;
if (isImmSExt20(Addr.getOperand(1), Imm)) {
// If this is an or of disjoint bitfields, we can codegen this as an add
// (for better address arithmetic) if the LHS and RHS of the OR are
// provably disjoint.
APInt LHSKnownZero, LHSKnownOne;
CurDAG->ComputeMaskedBits(Addr.getOperand(0),
APInt::getAllOnesValue(Addr.getOperand(0)
.getValueSizeInBits()),
LHSKnownZero, LHSKnownOne);
if ((LHSKnownZero.getZExtValue()|~(uint64_t)Imm) == ~0ULL) {
// If all of the bits are known zero on the LHS or RHS, the add won't
// carry.
Base = Addr.getOperand(0);
Disp = CurDAG->getTargetConstant(Imm, MVT::i64);
return true;
}
}
} else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr)) {
// Loading from a constant address.
// If this address fits entirely in a 20-bit sext immediate field, codegen
// this as "d(r0)"
int64_t Imm;
if (isImmSExt20(CN, Imm)) {
Disp = CurDAG->getTargetConstant(Imm, MVT::i64);
Base = CurDAG->getRegister(0, VT);
return true;
}
}
Disp = CurDAG->getTargetConstant(0, MVT::i64);
if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Addr))
Base = CurDAG->getTargetFrameIndex(FI->getIndex(), VT);
else
Base = Addr;
return true; // [r+0]
}
/// MatchAddress - Add the specified node to the specified addressing mode,
/// returning true if it cannot be done. This just pattern matches for the
/// addressing mode.
@ -360,7 +223,7 @@ bool SystemZDAGToDAGISel::MatchAddress(SDValue N, SystemZRRIAddressMode &AM,
break;
}
// Test if the index field is free for use.
if (AM.IndexReg.getNode()) {
if (AM.IndexReg.getNode() && !AM.isRI) {
AM = Backup;
break;
}
@ -407,7 +270,8 @@ bool SystemZDAGToDAGISel::MatchAddress(SDValue N, SystemZRRIAddressMode &AM,
// If we couldn't fold both operands into the address at the same time,
// see if we can just put each operand into a register and fold at least
// the add.
if (AM.BaseType == SystemZRRIAddressMode::RegBase &&
if (!AM.isRI &&
AM.BaseType == SystemZRRIAddressMode::RegBase &&
!AM.Base.Reg.getNode() && !AM.IndexReg.getNode()) {
AM.Base.Reg = N.getNode()->getOperand(0);
AM.IndexReg = N.getNode()->getOperand(1);
@ -448,8 +312,8 @@ bool SystemZDAGToDAGISel::MatchAddressBase(SDValue N,
SystemZRRIAddressMode &AM) {
// Is the base register already occupied?
if (AM.BaseType != SystemZRRIAddressMode::RegBase || AM.Base.Reg.getNode()) {
// If so, check to see if the scale index register is set.
if (AM.IndexReg.getNode() == 0) {
// If so, check to see if the scale register is set.
if (AM.IndexReg.getNode() == 0 && !AM.isRI) {
AM.IndexReg = N;
return false;
}
@ -464,22 +328,118 @@ bool SystemZDAGToDAGISel::MatchAddressBase(SDValue N,
return false;
}
void SystemZDAGToDAGISel::getAddressOperands(const SystemZRRIAddressMode &AM,
SDValue &Base, SDValue &Disp,
SDValue &Index) {
void SystemZDAGToDAGISel::getAddressOperandsRI(const SystemZRRIAddressMode &AM,
SDValue &Base, SDValue &Disp) {
if (AM.BaseType == SystemZRRIAddressMode::RegBase)
Base = AM.Base.Reg;
else
Base = CurDAG->getTargetFrameIndex(AM.Base.FrameIndex, TLI.getPointerTy());
Index = AM.IndexReg;
Disp = CurDAG->getTargetConstant(AM.Disp, MVT::i64);
}
void SystemZDAGToDAGISel::getAddressOperands(const SystemZRRIAddressMode &AM,
SDValue &Base, SDValue &Disp,
SDValue &Index) {
getAddressOperandsRI(AM, Base, Disp);
Index = AM.IndexReg;
}
/// Returns true if the address can be represented by a base register plus
/// an unsigned 12-bit displacement [r+imm].
bool SystemZDAGToDAGISel::SelectAddrRI12(SDValue Op, SDValue& Addr,
SDValue &Base, SDValue &Disp) {
SystemZRRIAddressMode AM20(/*isRI*/true), AM12(/*isRI*/true);
bool Done = false;
if (!Addr.hasOneUse()) {
unsigned Opcode = Addr.getOpcode();
if (Opcode != ISD::Constant && Opcode != ISD::FrameIndex) {
// If we are able to fold N into addressing mode, then we'll allow it even
// if N has multiple uses. In general, addressing computation is used as
// addresses by all of its uses. But watch out for CopyToReg uses, that
// means the address computation is liveout. It will be computed by a LA
// so we want to avoid computing the address twice.
for (SDNode::use_iterator UI = Addr.getNode()->use_begin(),
UE = Addr.getNode()->use_end(); UI != UE; ++UI) {
if (UI->getOpcode() == ISD::CopyToReg) {
MatchAddressBase(Addr, AM12);
Done = true;
break;
}
}
}
}
if (!Done && MatchAddress(Addr, AM12, /* is12Bit */ true))
return false;
// Check, whether we can match stuff using 20-bit displacements
if (!Done && !MatchAddress(Addr, AM20, /* is12Bit */ false))
if (AM12.Disp == 0 && AM20.Disp != 0)
return false;
DOUT << "MatchAddress (final): "; DEBUG(AM12.dump());
MVT VT = Addr.getValueType();
if (AM12.BaseType == SystemZRRIAddressMode::RegBase) {
if (!AM12.Base.Reg.getNode())
AM12.Base.Reg = CurDAG->getRegister(0, VT);
}
assert(AM12.IndexReg.getNode() == 0 && "Invalid reg-imm address mode!");
getAddressOperandsRI(AM12, Base, Disp);
return true;
}
/// Returns true if the address can be represented by a base register plus
/// a signed 20-bit displacement [r+imm].
bool SystemZDAGToDAGISel::SelectAddrRI(SDValue Op, SDValue& Addr,
SDValue &Base, SDValue &Disp) {
SystemZRRIAddressMode AM(/*isRI*/true);
bool Done = false;
if (!Addr.hasOneUse()) {
unsigned Opcode = Addr.getOpcode();
if (Opcode != ISD::Constant && Opcode != ISD::FrameIndex) {
// If we are able to fold N into addressing mode, then we'll allow it even
// if N has multiple uses. In general, addressing computation is used as
// addresses by all of its uses. But watch out for CopyToReg uses, that
// means the address computation is liveout. It will be computed by a LA
// so we want to avoid computing the address twice.
for (SDNode::use_iterator UI = Addr.getNode()->use_begin(),
UE = Addr.getNode()->use_end(); UI != UE; ++UI) {
if (UI->getOpcode() == ISD::CopyToReg) {
MatchAddressBase(Addr, AM);
Done = true;
break;
}
}
}
}
if (!Done && MatchAddress(Addr, AM, /* is12Bit */ false))
return false;
DOUT << "MatchAddress (final): "; DEBUG(AM.dump());
MVT VT = Addr.getValueType();
if (AM.BaseType == SystemZRRIAddressMode::RegBase) {
if (!AM.Base.Reg.getNode())
AM.Base.Reg = CurDAG->getRegister(0, VT);
}
assert(AM.IndexReg.getNode() == 0 && "Invalid reg-imm address mode!");
getAddressOperandsRI(AM, Base, Disp);
return true;
}
/// Returns true if the address can be represented by a base register plus
/// index register plus an unsigned 12-bit displacement [base + idx + imm].
bool SystemZDAGToDAGISel::SelectAddrRRI12(SDValue Op, SDValue Addr,
SDValue &Base, SDValue &Disp, SDValue &Index) {
SystemZRRIAddressMode AM20, AM12;
SystemZRRIAddressMode AM20(/*isRI*/true), AM12(/*isRI*/true);
bool Done = false;
if (!Addr.hasOneUse()) {

3
lib/Target/SystemZ/SystemZInstrInfo.cpp
View File

@ -351,6 +351,9 @@ SystemZInstrInfo::getLongDispOpc(unsigned Opc) const {
case SystemZ::MOV64m32r:
Opc = SystemZ::MOV64m32ry;
break;
case SystemZ::MOV8mi:
Opc = SystemZ::MOV8miy;
break;
case SystemZ::MUL32rm:
Opc = SystemZ::MUL32rmy;
break;

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

@ -244,22 +244,24 @@ def MOV64mr : Pseudo<(outs), (ins rriaddr:$dst, GR64:$src),
"stg\t{$src, $dst}",
[(store GR64:$src, rriaddr:$dst)]>;
// FIXME: displacements here are really 12 bit, not 20!
def MOV8mi : Pseudo<(outs), (ins riaddr:$dst, i32i8imm:$src),
def MOV8mi : Pseudo<(outs), (ins riaddr12:$dst, i32i8imm:$src),
"mvi\t{$dst, $src}",
[(truncstorei8 (i32 i32immSExt8:$src), riaddr12:$dst)]>;
def MOV8miy : Pseudo<(outs), (ins riaddr:$dst, i32i8imm:$src),
"mviy\t{$dst, $src}",
[(truncstorei8 (i32 i32immSExt8:$src), riaddr:$dst)]>;
def MOV16mi : Pseudo<(outs), (ins riaddr:$dst, s16imm:$src),
def MOV16mi : Pseudo<(outs), (ins riaddr12:$dst, s16imm:$src),
"mvhhi\t{$dst, $src}",
[(truncstorei16 (i32 i32immSExt16:$src), riaddr:$dst)]>,
[(truncstorei16 (i32 i32immSExt16:$src), riaddr12:$dst)]>,
Requires<[IsZ10]>;
def MOV32mi16 : Pseudo<(outs), (ins riaddr:$dst, s32imm:$src),
def MOV32mi16 : Pseudo<(outs), (ins riaddr12:$dst, s32imm:$src),
"mvhi\t{$dst, $src}",
[(store (i32 immSExt16:$src), riaddr:$dst)]>,
[(store (i32 immSExt16:$src), riaddr12:$dst)]>,
Requires<[IsZ10]>;
def MOV64mi16 : Pseudo<(outs), (ins riaddr:$dst, s32imm64:$src),
def MOV64mi16 : Pseudo<(outs), (ins riaddr12:$dst, s32imm64:$src),
"mvghi\t{$dst, $src}",
[(store (i64 immSExt16:$src), riaddr:$dst)]>,
[(store (i64 immSExt16:$src), riaddr12:$dst)]>,
Requires<[IsZ10]>;
// sexts

8
lib/Target/SystemZ/SystemZOperands.td
View File

@ -252,11 +252,17 @@ def s32imm64 : Operand<i64> {
// riaddr := reg + imm
def riaddr32 : Operand<i32>,
ComplexPattern<i32, 2, "SelectAddrRI32", []> {
ComplexPattern<i32, 2, "SelectAddrRI12", []> {
let PrintMethod = "printRIAddrOperand";
let MIOperandInfo = (ops ADDR32:$base, u12imm:$disp);
}
def riaddr12 : Operand<i64>,
ComplexPattern<i64, 2, "SelectAddrRI12", []> {
let PrintMethod = "printRIAddrOperand";
let MIOperandInfo = (ops ADDR64:$base, u12imm64:$disp);
}
def riaddr : Operand<i64>,
ComplexPattern<i64, 2, "SelectAddrRI", []> {
let PrintMethod = "printRIAddrOperand";

17
test/CodeGen/SystemZ/05-MemImmStores.ll
View File

@ -1,7 +1,8 @@
; RUN: llvm-as < %s | llc -mattr=+z10 | grep mvghi | count 1
; RUN: llvm-as < %s | llc -mattr=+z10 | grep mvhi | count 1
; RUN: llvm-as < %s | llc -mattr=+z10 | grep mvhhi | count 1
; RUN: llvm-as < %s | llc | grep mvi | count 1
; RUN: llvm-as < %s | llc | grep mvi | count 2
; RUN: llvm-as < %s | llc | grep mviy | count 1
target datalayout = "E-p:64:64:64-i1:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128"
target triple = "s390x-unknown-linux-gnu"
@ -33,3 +34,17 @@ entry:
store i8 4, i8* %add.ptr
ret void
}
define void @foo5(i8* nocapture %a, i64 %idx) nounwind {
entry:
%add.ptr = getelementptr i8* %a, i64 -1 ; <i8*> [#uses=1]
store i8 4, i8* %add.ptr
ret void
}
define void @foo6(i16* nocapture %a, i64 %idx) nounwind {
entry:
%add.ptr = getelementptr i16* %a, i64 -1 ; <i16*> [#uses=1]
store i16 3, i16* %add.ptr
ret void
}