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review.shift-gmbh.com / SHIFTPHONES / android_art / e508a2090b19fe705fbc6b99d76474037a74bbfb / . / compiler / dex / quick / arm / int_arm.cc
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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* This file contains codegen for the Thumb2 ISA. */
#include "arm_lir.h"
#include "codegen_arm.h"
#include "dex/quick/mir_to_lir-inl.h"
#include "entrypoints/quick/quick_entrypoints.h"
#include "mirror/array.h"
namespace art {
LIR* ArmMir2Lir::OpCmpBranch(ConditionCode cond, int src1, int src2, LIR* target) {
OpRegReg(kOpCmp, src1, src2);
return OpCondBranch(cond, target);
}
/*
* Generate a Thumb2 IT instruction, which can nullify up to
* four subsequent instructions based on a condition and its
* inverse. The condition applies to the first instruction, which
* is executed if the condition is met. The string "guide" consists
* of 0 to 3 chars, and applies to the 2nd through 4th instruction.
* A "T" means the instruction is executed if the condition is
* met, and an "E" means the instruction is executed if the condition
* is not met.
*/
LIR* ArmMir2Lir::OpIT(ConditionCode ccode, const char* guide) {
int mask;
int mask3 = 0;
int mask2 = 0;
int mask1 = 0;
ArmConditionCode code = ArmConditionEncoding(ccode);
int cond_bit = code & 1;
int alt_bit = cond_bit ^ 1;
// Note: case fallthroughs intentional
switch (strlen(guide)) {
case 3:
mask1 = (guide[2] == 'T') ? cond_bit : alt_bit;
case 2:
mask2 = (guide[1] == 'T') ? cond_bit : alt_bit;
case 1:
mask3 = (guide[0] == 'T') ? cond_bit : alt_bit;
break;
case 0:
break;
default:
LOG(FATAL) << "OAT: bad case in OpIT";
}
mask = (mask3 << 3) | (mask2 << 2) | (mask1 << 1) |
(1 << (3 - strlen(guide)));
return NewLIR2(kThumb2It, code, mask);
}
/*
* 64-bit 3way compare function.
* mov rX, #-1
* cmp op1hi, op2hi
* blt done
* bgt flip
* sub rX, op1lo, op2lo (treat as unsigned)
* beq done
* ite hi
* mov(hi) rX, #-1
* mov(!hi) rX, #1
* flip:
* neg rX
* done:
*/
void ArmMir2Lir::GenCmpLong(RegLocation rl_dest, RegLocation rl_src1,
RegLocation rl_src2) {
LIR* target1;
LIR* target2;
rl_src1 = LoadValueWide(rl_src1, kCoreReg);
rl_src2 = LoadValueWide(rl_src2, kCoreReg);
int t_reg = AllocTemp();
LoadConstant(t_reg, -1);
OpRegReg(kOpCmp, rl_src1.high_reg, rl_src2.high_reg);
LIR* branch1 = OpCondBranch(kCondLt, NULL);
LIR* branch2 = OpCondBranch(kCondGt, NULL);
OpRegRegReg(kOpSub, t_reg, rl_src1.low_reg, rl_src2.low_reg);
LIR* branch3 = OpCondBranch(kCondEq, NULL);
OpIT(kCondHi, "E");
NewLIR2(kThumb2MovImmShift, t_reg, ModifiedImmediate(-1));
LoadConstant(t_reg, 1);
GenBarrier();
target2 = NewLIR0(kPseudoTargetLabel);
OpRegReg(kOpNeg, t_reg, t_reg);
target1 = NewLIR0(kPseudoTargetLabel);
RegLocation rl_temp = LocCReturn(); // Just using as template, will change
rl_temp.low_reg = t_reg;
StoreValue(rl_dest, rl_temp);
FreeTemp(t_reg);
branch1->target = target1;
branch2->target = target2;
branch3->target = branch1->target;
}
void ArmMir2Lir::GenFusedLongCmpImmBranch(BasicBlock* bb, RegLocation rl_src1,
int64_t val, ConditionCode ccode) {
int32_t val_lo = Low32Bits(val);
int32_t val_hi = High32Bits(val);
DCHECK_GE(ModifiedImmediate(val_lo), 0);
DCHECK_GE(ModifiedImmediate(val_hi), 0);
LIR* taken = &block_label_list_[bb->taken];
LIR* not_taken = &block_label_list_[bb->fall_through];
rl_src1 = LoadValueWide(rl_src1, kCoreReg);
int32_t low_reg = rl_src1.low_reg;
int32_t high_reg = rl_src1.high_reg;
switch (ccode) {
case kCondEq:
case kCondNe:
LIR* target;
ConditionCode condition;
if (ccode == kCondEq) {
target = not_taken;
condition = kCondEq;
} else {
target = taken;
condition = kCondNe;
}
if (val == 0) {
int t_reg = AllocTemp();
NewLIR4(kThumb2OrrRRRs, t_reg, low_reg, high_reg, 0);
FreeTemp(t_reg);
OpCondBranch(condition, taken);
return;
}
OpCmpImmBranch(kCondNe, high_reg, val_hi, target);
break;
case kCondLt:
OpCmpImmBranch(kCondLt, high_reg, val_hi, taken);
OpCmpImmBranch(kCondGt, high_reg, val_hi, not_taken);
ccode = kCondCc;
break;
case kCondLe:
OpCmpImmBranch(kCondLt, high_reg, val_hi, taken);
OpCmpImmBranch(kCondGt, high_reg, val_hi, not_taken);
ccode = kCondLs;
break;
case kCondGt:
OpCmpImmBranch(kCondGt, high_reg, val_hi, taken);
OpCmpImmBranch(kCondLt, high_reg, val_hi, not_taken);
ccode = kCondHi;
break;
case kCondGe:
OpCmpImmBranch(kCondGt, high_reg, val_hi, taken);
OpCmpImmBranch(kCondLt, high_reg, val_hi, not_taken);
ccode = kCondCs;
break;
default:
LOG(FATAL) << "Unexpected ccode: " << ccode;
}
OpCmpImmBranch(ccode, low_reg, val_lo, taken);
}
void ArmMir2Lir::GenSelect(BasicBlock* bb, MIR* mir) {
RegLocation rl_result;
RegLocation rl_src = mir_graph_->GetSrc(mir, 0);
RegLocation rl_dest = mir_graph_->GetDest(mir);
rl_src = LoadValue(rl_src, kCoreReg);
if (mir->ssa_rep->num_uses == 1) {
// CONST case
int true_val = mir->dalvikInsn.vB;
int false_val = mir->dalvikInsn.vC;
rl_result = EvalLoc(rl_dest, kCoreReg, true);
if ((true_val == 1) && (false_val == 0)) {
OpRegRegImm(kOpRsub, rl_result.low_reg, rl_src.low_reg, 1);
OpIT(kCondCc, "");
LoadConstant(rl_result.low_reg, 0);
GenBarrier(); // Add a scheduling barrier to keep the IT shadow intact
} else if (InexpensiveConstantInt(true_val) && InexpensiveConstantInt(false_val)) {
OpRegImm(kOpCmp, rl_src.low_reg, 0);
OpIT(kCondEq, "E");
LoadConstant(rl_result.low_reg, true_val);
LoadConstant(rl_result.low_reg, false_val);
GenBarrier(); // Add a scheduling barrier to keep the IT shadow intact
} else {
// Unlikely case - could be tuned.
int t_reg1 = AllocTemp();
int t_reg2 = AllocTemp();
LoadConstant(t_reg1, true_val);
LoadConstant(t_reg2, false_val);
OpRegImm(kOpCmp, rl_src.low_reg, 0);
OpIT(kCondEq, "E");
OpRegCopy(rl_result.low_reg, t_reg1);
OpRegCopy(rl_result.low_reg, t_reg2);
GenBarrier(); // Add a scheduling barrier to keep the IT shadow intact
}
} else {
// MOVE case
RegLocation rl_true = mir_graph_->reg_location_[mir->ssa_rep->uses[1]];
RegLocation rl_false = mir_graph_->reg_location_[mir->ssa_rep->uses[2]];
rl_true = LoadValue(rl_true, kCoreReg);
rl_false = LoadValue(rl_false, kCoreReg);
rl_result = EvalLoc(rl_dest, kCoreReg, true);
OpRegImm(kOpCmp, rl_src.low_reg, 0);
if (rl_result.low_reg == rl_true.low_reg) { // Is the "true" case already in place?
OpIT(kCondNe, "");
OpRegCopy(rl_result.low_reg, rl_false.low_reg);
} else if (rl_result.low_reg == rl_false.low_reg) { // False case in place?
OpIT(kCondEq, "");
OpRegCopy(rl_result.low_reg, rl_true.low_reg);
} else { // Normal - select between the two.
OpIT(kCondEq, "E");
OpRegCopy(rl_result.low_reg, rl_true.low_reg);
OpRegCopy(rl_result.low_reg, rl_false.low_reg);
}
GenBarrier(); // Add a scheduling barrier to keep the IT shadow intact
}
StoreValue(rl_dest, rl_result);
}
void ArmMir2Lir::GenFusedLongCmpBranch(BasicBlock* bb, MIR* mir) {
RegLocation rl_src1 = mir_graph_->GetSrcWide(mir, 0);
RegLocation rl_src2 = mir_graph_->GetSrcWide(mir, 2);
// Normalize such that if either operand is constant, src2 will be constant.
ConditionCode ccode = static_cast<ConditionCode>(mir->dalvikInsn.arg[0]);
if (rl_src1.is_const) {
RegLocation rl_temp = rl_src1;
rl_src1 = rl_src2;
rl_src2 = rl_temp;
ccode = FlipComparisonOrder(ccode);
}
if (rl_src2.is_const) {
RegLocation rl_temp = UpdateLocWide(rl_src2);
// Do special compare/branch against simple const operand if not already in registers.
int64_t val = mir_graph_->ConstantValueWide(rl_src2);
if ((rl_temp.location != kLocPhysReg) &&
((ModifiedImmediate(Low32Bits(val)) >= 0) && (ModifiedImmediate(High32Bits(val)) >= 0))) {
GenFusedLongCmpImmBranch(bb, rl_src1, val, ccode);
return;
}
}
LIR* taken = &block_label_list_[bb->taken];
LIR* not_taken = &block_label_list_[bb->fall_through];
rl_src1 = LoadValueWide(rl_src1, kCoreReg);
rl_src2 = LoadValueWide(rl_src2, kCoreReg);
OpRegReg(kOpCmp, rl_src1.high_reg, rl_src2.high_reg);
switch (ccode) {
case kCondEq:
OpCondBranch(kCondNe, not_taken);
break;
case kCondNe:
OpCondBranch(kCondNe, taken);
break;
case kCondLt:
OpCondBranch(kCondLt, taken);
OpCondBranch(kCondGt, not_taken);
ccode = kCondCc;
break;
case kCondLe:
OpCondBranch(kCondLt, taken);
OpCondBranch(kCondGt, not_taken);
ccode = kCondLs;
break;
case kCondGt:
OpCondBranch(kCondGt, taken);
OpCondBranch(kCondLt, not_taken);
ccode = kCondHi;
break;
case kCondGe:
OpCondBranch(kCondGt, taken);
OpCondBranch(kCondLt, not_taken);
ccode = kCondCs;
break;
default:
LOG(FATAL) << "Unexpected ccode: " << ccode;
}
OpRegReg(kOpCmp, rl_src1.low_reg, rl_src2.low_reg);
OpCondBranch(ccode, taken);
}
/*
* Generate a register comparison to an immediate and branch. Caller
* is responsible for setting branch target field.
*/
LIR* ArmMir2Lir::OpCmpImmBranch(ConditionCode cond, int reg, int check_value,
LIR* target) {
LIR* branch;
int mod_imm;
ArmConditionCode arm_cond = ArmConditionEncoding(cond);
/*
* A common use of OpCmpImmBranch is for null checks, and using the Thumb 16-bit
* compare-and-branch if zero is ideal if it will reach. However, because null checks
* branch forward to a launch pad, they will frequently not reach - and thus have to
* be converted to a long form during assembly (which will trigger another assembly
* pass). Here we estimate the branch distance for checks, and if large directly
* generate the long form in an attempt to avoid an extra assembly pass.
* TODO: consider interspersing launchpads in code following unconditional branches.
*/
bool skip = ((target != NULL) && (target->opcode == kPseudoThrowTarget));
skip &= ((cu_->code_item->insns_size_in_code_units_ - current_dalvik_offset_) > 64);
if (!skip && (ARM_LOWREG(reg)) && (check_value == 0) &&
((arm_cond == kArmCondEq) || (arm_cond == kArmCondNe))) {
branch = NewLIR2((arm_cond == kArmCondEq) ? kThumb2Cbz : kThumb2Cbnz,
reg, 0);
} else {
mod_imm = ModifiedImmediate(check_value);
if (ARM_LOWREG(reg) && ((check_value & 0xff) == check_value)) {
NewLIR2(kThumbCmpRI8, reg, check_value);
} else if (mod_imm >= 0) {
NewLIR2(kThumb2CmpRI12, reg, mod_imm);
} else {
int t_reg = AllocTemp();
LoadConstant(t_reg, check_value);
OpRegReg(kOpCmp, reg, t_reg);
}
branch = NewLIR2(kThumbBCond, 0, arm_cond);
}
branch->target = target;
return branch;
}
LIR* ArmMir2Lir::OpRegCopyNoInsert(int r_dest, int r_src) {
LIR* res;
int opcode;
if (ARM_FPREG(r_dest) || ARM_FPREG(r_src))
return OpFpRegCopy(r_dest, r_src);
if (ARM_LOWREG(r_dest) && ARM_LOWREG(r_src))
opcode = kThumbMovRR;
else if (!ARM_LOWREG(r_dest) && !ARM_LOWREG(r_src))
opcode = kThumbMovRR_H2H;
else if (ARM_LOWREG(r_dest))
opcode = kThumbMovRR_H2L;
else
opcode = kThumbMovRR_L2H;
res = RawLIR(current_dalvik_offset_, opcode, r_dest, r_src);
if (!(cu_->disable_opt & (1 << kSafeOptimizations)) && r_dest == r_src) {
res->flags.is_nop = true;
}
return res;
}
LIR* ArmMir2Lir::OpRegCopy(int r_dest, int r_src) {
LIR* res = OpRegCopyNoInsert(r_dest, r_src);
AppendLIR(res);
return res;
}
void ArmMir2Lir::OpRegCopyWide(int dest_lo, int dest_hi, int src_lo,
int src_hi) {
bool dest_fp = ARM_FPREG(dest_lo) && ARM_FPREG(dest_hi);
bool src_fp = ARM_FPREG(src_lo) && ARM_FPREG(src_hi);
DCHECK_EQ(ARM_FPREG(src_lo), ARM_FPREG(src_hi));
DCHECK_EQ(ARM_FPREG(dest_lo), ARM_FPREG(dest_hi));
if (dest_fp) {
if (src_fp) {
OpRegCopy(S2d(dest_lo, dest_hi), S2d(src_lo, src_hi));
} else {
NewLIR3(kThumb2Fmdrr, S2d(dest_lo, dest_hi), src_lo, src_hi);
}
} else {
if (src_fp) {
NewLIR3(kThumb2Fmrrd, dest_lo, dest_hi, S2d(src_lo, src_hi));
} else {
// Handle overlap
if (src_hi == dest_lo) {
OpRegCopy(dest_hi, src_hi);
OpRegCopy(dest_lo, src_lo);
} else {
OpRegCopy(dest_lo, src_lo);
OpRegCopy(dest_hi, src_hi);
}
}
}
}
// Table of magic divisors
struct MagicTable {
uint32_t magic;
uint32_t shift;
DividePattern pattern;
};
static const MagicTable magic_table[] = {
{0, 0, DivideNone}, // 0
{0, 0, DivideNone}, // 1
{0, 0, DivideNone}, // 2
{0x55555556, 0, Divide3}, // 3
{0, 0, DivideNone}, // 4
{0x66666667, 1, Divide5}, // 5
{0x2AAAAAAB, 0, Divide3}, // 6
{0x92492493, 2, Divide7}, // 7
{0, 0, DivideNone}, // 8
{0x38E38E39, 1, Divide5}, // 9
{0x66666667, 2, Divide5}, // 10
{0x2E8BA2E9, 1, Divide5}, // 11
{0x2AAAAAAB, 1, Divide5}, // 12
{0x4EC4EC4F, 2, Divide5}, // 13
{0x92492493, 3, Divide7}, // 14
{0x88888889, 3, Divide7}, // 15
};
// Integer division by constant via reciprocal multiply (Hacker's Delight, 10-4)
bool ArmMir2Lir::SmallLiteralDivRem(Instruction::Code dalvik_opcode, bool is_div,
RegLocation rl_src, RegLocation rl_dest, int lit) {
if ((lit < 0) || (lit >= static_cast<int>(sizeof(magic_table)/sizeof(magic_table[0])))) {
return false;
}
DividePattern pattern = magic_table[lit].pattern;
if (pattern == DivideNone) {
return false;
}
// Tuning: add rem patterns
if (!is_div) {
return false;
}
int r_magic = AllocTemp();
LoadConstant(r_magic, magic_table[lit].magic);
rl_src = LoadValue(rl_src, kCoreReg);
RegLocation rl_result = EvalLoc(rl_dest, kCoreReg, true);
int r_hi = AllocTemp();
int r_lo = AllocTemp();
NewLIR4(kThumb2Smull, r_lo, r_hi, r_magic, rl_src.low_reg);
switch (pattern) {
case Divide3:
OpRegRegRegShift(kOpSub, rl_result.low_reg, r_hi,
rl_src.low_reg, EncodeShift(kArmAsr, 31));
break;
case Divide5:
OpRegRegImm(kOpAsr, r_lo, rl_src.low_reg, 31);
OpRegRegRegShift(kOpRsub, rl_result.low_reg, r_lo, r_hi,
EncodeShift(kArmAsr, magic_table[lit].shift));
break;
case Divide7:
OpRegReg(kOpAdd, r_hi, rl_src.low_reg);
OpRegRegImm(kOpAsr, r_lo, rl_src.low_reg, 31);
OpRegRegRegShift(kOpRsub, rl_result.low_reg, r_lo, r_hi,
EncodeShift(kArmAsr, magic_table[lit].shift));
break;
default:
LOG(FATAL) << "Unexpected pattern: " << pattern;
}
StoreValue(rl_dest, rl_result);
return true;
}
LIR* ArmMir2Lir::GenRegMemCheck(ConditionCode c_code,
int reg1, int base, int offset, ThrowKind kind) {
LOG(FATAL) << "Unexpected use of GenRegMemCheck for Arm";
return NULL;
}
RegLocation ArmMir2Lir::GenDivRemLit(RegLocation rl_dest, int reg1, int lit,
bool is_div) {
LOG(FATAL) << "Unexpected use of GenDivRemLit for Arm";
return rl_dest;
}
RegLocation ArmMir2Lir::GenDivRem(RegLocation rl_dest, int reg1, int reg2,
bool is_div) {
LOG(FATAL) << "Unexpected use of GenDivRem for Arm";
return rl_dest;
}
bool ArmMir2Lir::GenInlinedMinMaxInt(CallInfo* info, bool is_min) {
DCHECK_EQ(cu_->instruction_set, kThumb2);
RegLocation rl_src1 = info->args[0];
RegLocation rl_src2 = info->args[1];
rl_src1 = LoadValue(rl_src1, kCoreReg);
rl_src2 = LoadValue(rl_src2, kCoreReg);
RegLocation rl_dest = InlineTarget(info);
RegLocation rl_result = EvalLoc(rl_dest, kCoreReg, true);
OpRegReg(kOpCmp, rl_src1.low_reg, rl_src2.low_reg);
OpIT((is_min) ? kCondGt : kCondLt, "E");
OpRegReg(kOpMov, rl_result.low_reg, rl_src2.low_reg);
OpRegReg(kOpMov, rl_result.low_reg, rl_src1.low_reg);
GenBarrier();
StoreValue(rl_dest, rl_result);
return true;
}
bool ArmMir2Lir::GenInlinedPeek(CallInfo* info, OpSize size) {
RegLocation rl_src_address = info->args[0]; // long address
rl_src_address.wide = 0; // ignore high half in info->args[1]
RegLocation rl_dest = InlineTarget(info);
RegLocation rl_address = LoadValue(rl_src_address, kCoreReg);
RegLocation rl_result = EvalLoc(rl_dest, kCoreReg, true);
if (size == kLong) {
// Fake unaligned LDRD by two unaligned LDR instructions on ARMv7 with SCTLR.A set to 0.
if (rl_address.low_reg != rl_result.low_reg) {
LoadBaseDisp(rl_address.low_reg, 0, rl_result.low_reg, kWord, INVALID_SREG);
LoadBaseDisp(rl_address.low_reg, 4, rl_result.high_reg, kWord, INVALID_SREG);
} else {
LoadBaseDisp(rl_address.low_reg, 4, rl_result.high_reg, kWord, INVALID_SREG);
LoadBaseDisp(rl_address.low_reg, 0, rl_result.low_reg, kWord, INVALID_SREG);
}
StoreValueWide(rl_dest, rl_result);
} else {
DCHECK(size == kSignedByte || size == kSignedHalf || size == kWord);
// Unaligned load with LDR and LDRSH is allowed on ARMv7 with SCTLR.A set to 0.
LoadBaseDisp(rl_address.low_reg, 0, rl_result.low_reg, size, INVALID_SREG);
StoreValue(rl_dest, rl_result);
}
return true;
}
bool ArmMir2Lir::GenInlinedPoke(CallInfo* info, OpSize size) {
RegLocation rl_src_address = info->args[0]; // long address
rl_src_address.wide = 0; // ignore high half in info->args[1]
RegLocation rl_src_value = info->args[2]; // [size] value
RegLocation rl_address = LoadValue(rl_src_address, kCoreReg);
if (size == kLong) {
// Fake unaligned STRD by two unaligned STR instructions on ARMv7 with SCTLR.A set to 0.
RegLocation rl_value = LoadValueWide(rl_src_value, kCoreReg);
StoreBaseDisp(rl_address.low_reg, 0, rl_value.low_reg, kWord);
StoreBaseDisp(rl_address.low_reg, 4, rl_value.high_reg, kWord);
} else {
DCHECK(size == kSignedByte || size == kSignedHalf || size == kWord);
// Unaligned store with STR and STRSH is allowed on ARMv7 with SCTLR.A set to 0.
RegLocation rl_value = LoadValue(rl_src_value, kCoreReg);
StoreBaseDisp(rl_address.low_reg, 0, rl_value.low_reg, size);
}
return true;
}
void ArmMir2Lir::OpLea(int rBase, int reg1, int reg2, int scale, int offset) {
LOG(FATAL) << "Unexpected use of OpLea for Arm";
}
void ArmMir2Lir::OpTlsCmp(ThreadOffset offset, int val) {
LOG(FATAL) << "Unexpected use of OpTlsCmp for Arm";
}
bool ArmMir2Lir::GenInlinedCas32(CallInfo* info, bool need_write_barrier) {
DCHECK_EQ(cu_->instruction_set, kThumb2);
// Unused - RegLocation rl_src_unsafe = info->args[0];
RegLocation rl_src_obj= info->args[1]; // Object - known non-null
RegLocation rl_src_offset= info->args[2]; // long low
rl_src_offset.wide = 0; // ignore high half in info->args[3]
RegLocation rl_src_expected= info->args[4]; // int or Object
RegLocation rl_src_new_value= info->args[5]; // int or Object
RegLocation rl_dest = InlineTarget(info); // boolean place for result
// Release store semantics, get the barrier out of the way. TODO: revisit
GenMemBarrier(kStoreLoad);
RegLocation rl_object = LoadValue(rl_src_obj, kCoreReg);
RegLocation rl_new_value = LoadValue(rl_src_new_value, kCoreReg);
if (need_write_barrier && !mir_graph_->IsConstantNullRef(rl_new_value)) {
// Mark card for object assuming new value is stored.
MarkGCCard(rl_new_value.low_reg, rl_object.low_reg);
}
RegLocation rl_offset = LoadValue(rl_src_offset, kCoreReg);
int r_ptr = AllocTemp();
OpRegRegReg(kOpAdd, r_ptr, rl_object.low_reg, rl_offset.low_reg);
// Free now unneeded rl_object and rl_offset to give more temps.
ClobberSReg(rl_object.s_reg_low);
FreeTemp(rl_object.low_reg);
ClobberSReg(rl_offset.s_reg_low);
FreeTemp(rl_offset.low_reg);
RegLocation rl_result = EvalLoc(rl_dest, kCoreReg, true);
LoadConstant(rl_result.low_reg, 0); // r_result := 0
// while ([r_ptr] == rExpected && r_result == 0) {
// [r_ptr] <- r_new_value && r_result := success ? 0 : 1
// r_result ^= 1
// }
int r_old_value = AllocTemp();
LIR* target = NewLIR0(kPseudoTargetLabel);
NewLIR3(kThumb2Ldrex, r_old_value, r_ptr, 0);
RegLocation rl_expected = LoadValue(rl_src_expected, kCoreReg);
OpRegReg(kOpCmp, r_old_value, rl_expected.low_reg);
FreeTemp(r_old_value); // Now unneeded.
OpIT(kCondEq, "TT");
NewLIR4(kThumb2Strex /* eq */, rl_result.low_reg, rl_new_value.low_reg, r_ptr, 0);
FreeTemp(r_ptr); // Now unneeded.
OpRegImm(kOpXor /* eq */, rl_result.low_reg, 1);
OpRegImm(kOpCmp /* eq */, rl_result.low_reg, 0);
OpCondBranch(kCondEq, target);
StoreValue(rl_dest, rl_result);
return true;
}
LIR* ArmMir2Lir::OpPcRelLoad(int reg, LIR* target) {
return RawLIR(current_dalvik_offset_, kThumb2LdrPcRel12, reg, 0, 0, 0, 0, target);
}
LIR* ArmMir2Lir::OpVldm(int rBase, int count) {
return NewLIR3(kThumb2Vldms, rBase, fr0, count);
}
LIR* ArmMir2Lir::OpVstm(int rBase, int count) {
return NewLIR3(kThumb2Vstms, rBase, fr0, count);
}
void ArmMir2Lir::GenMultiplyByTwoBitMultiplier(RegLocation rl_src,
RegLocation rl_result, int lit,
int first_bit, int second_bit) {
OpRegRegRegShift(kOpAdd, rl_result.low_reg, rl_src.low_reg, rl_src.low_reg,
EncodeShift(kArmLsl, second_bit - first_bit));
if (first_bit != 0) {
OpRegRegImm(kOpLsl, rl_result.low_reg, rl_result.low_reg, first_bit);
}
}
void ArmMir2Lir::GenDivZeroCheck(int reg_lo, int reg_hi) {
int t_reg = AllocTemp();
NewLIR4(kThumb2OrrRRRs, t_reg, reg_lo, reg_hi, 0);
FreeTemp(t_reg);
GenCheck(kCondEq, kThrowDivZero);
}
// Test suspend flag, return target of taken suspend branch
LIR* ArmMir2Lir::OpTestSuspend(LIR* target) {
NewLIR2(kThumbSubRI8, rARM_SUSPEND, 1);
return OpCondBranch((target == NULL) ? kCondEq : kCondNe, target);
}
// Decrement register and branch on condition
LIR* ArmMir2Lir::OpDecAndBranch(ConditionCode c_code, int reg, LIR* target) {
// Combine sub & test using sub setflags encoding here
NewLIR3(kThumb2SubsRRI12, reg, reg, 1);
return OpCondBranch(c_code, target);
}
void ArmMir2Lir::GenMemBarrier(MemBarrierKind barrier_kind) {
#if ANDROID_SMP != 0
int dmb_flavor;
// TODO: revisit Arm barrier kinds
switch (barrier_kind) {
case kLoadStore: dmb_flavor = kSY; break;
case kLoadLoad: dmb_flavor = kSY; break;
case kStoreStore: dmb_flavor = kST; break;
case kStoreLoad: dmb_flavor = kSY; break;
default:
LOG(FATAL) << "Unexpected MemBarrierKind: " << barrier_kind;
dmb_flavor = kSY; // quiet gcc.
break;
}
LIR* dmb = NewLIR1(kThumb2Dmb, dmb_flavor);
dmb->u.m.def_mask = ENCODE_ALL;
#endif
}
void ArmMir2Lir::GenNegLong(RegLocation rl_dest, RegLocation rl_src) {
rl_src = LoadValueWide(rl_src, kCoreReg);
RegLocation rl_result = EvalLoc(rl_dest, kCoreReg, true);
int z_reg = AllocTemp();
LoadConstantNoClobber(z_reg, 0);
// Check for destructive overlap
if (rl_result.low_reg == rl_src.high_reg) {
int t_reg = AllocTemp();
OpRegRegReg(kOpSub, rl_result.low_reg, z_reg, rl_src.low_reg);
OpRegRegReg(kOpSbc, rl_result.high_reg, z_reg, t_reg);
FreeTemp(t_reg);
} else {
OpRegRegReg(kOpSub, rl_result.low_reg, z_reg, rl_src.low_reg);
OpRegRegReg(kOpSbc, rl_result.high_reg, z_reg, rl_src.high_reg);
}
FreeTemp(z_reg);
StoreValueWide(rl_dest, rl_result);
}
/*
* Check to see if a result pair has a misaligned overlap with an operand pair. This
* is not usual for dx to generate, but it is legal (for now). In a future rev of
* dex, we'll want to make this case illegal.
*/
bool ArmMir2Lir::BadOverlap(RegLocation rl_src, RegLocation rl_dest) {
DCHECK(rl_src.wide);
DCHECK(rl_dest.wide);
return (abs(mir_graph_->SRegToVReg(rl_src.s_reg_low) - mir_graph_->SRegToVReg(rl_dest.s_reg_low)) == 1);
}
void ArmMir2Lir::GenMulLong(RegLocation rl_dest, RegLocation rl_src1,
RegLocation rl_src2) {
/*
* To pull off inline multiply, we have a worst-case requirement of 8 temporary
* registers. Normally for Arm, we get 5. We can get to 6 by including
* lr in the temp set. The only problematic case is all operands and result are
* distinct, and none have been promoted. In that case, we can succeed by aggressively
* freeing operand temp registers after they are no longer needed. All other cases
* can proceed normally. We'll just punt on the case of the result having a misaligned
* overlap with either operand and send that case to a runtime handler.
*/
RegLocation rl_result;
if (BadOverlap(rl_src1, rl_dest) || (BadOverlap(rl_src2, rl_dest))) {
ThreadOffset func_offset = QUICK_ENTRYPOINT_OFFSET(pLmul);
FlushAllRegs();
CallRuntimeHelperRegLocationRegLocation(func_offset, rl_src1, rl_src2, false);
rl_result = GetReturnWide(false);
StoreValueWide(rl_dest, rl_result);
return;
}
// Temporarily add LR to the temp pool, and assign it to tmp1
MarkTemp(rARM_LR);
FreeTemp(rARM_LR);
int tmp1 = rARM_LR;
LockTemp(rARM_LR);
rl_src1 = LoadValueWide(rl_src1, kCoreReg);
rl_src2 = LoadValueWide(rl_src2, kCoreReg);
bool special_case = true;
// If operands are the same, or any pair has been promoted we're not the special case.
if ((rl_src1.s_reg_low == rl_src2.s_reg_low) ||
(!IsTemp(rl_src1.low_reg) && !IsTemp(rl_src1.high_reg)) ||
(!IsTemp(rl_src2.low_reg) && !IsTemp(rl_src2.high_reg))) {
special_case = false;
}
// Tuning: if rl_dest has been promoted and is *not* either operand, could use directly.
int res_lo = AllocTemp();
int res_hi;
if (rl_src1.low_reg == rl_src2.low_reg) {
res_hi = AllocTemp();
NewLIR3(kThumb2MulRRR, tmp1, rl_src1.low_reg, rl_src1.high_reg);
NewLIR4(kThumb2Umull, res_lo, res_hi, rl_src1.low_reg, rl_src1.low_reg);
OpRegRegRegShift(kOpAdd, res_hi, res_hi, tmp1, EncodeShift(kArmLsl, 1));
} else {
// In the special case, all temps are now allocated
NewLIR3(kThumb2MulRRR, tmp1, rl_src2.low_reg, rl_src1.high_reg);
if (special_case) {
DCHECK_NE(rl_src1.low_reg, rl_src2.low_reg);
DCHECK_NE(rl_src1.high_reg, rl_src2.high_reg);
FreeTemp(rl_src1.high_reg);
}
res_hi = AllocTemp();
NewLIR4(kThumb2Umull, res_lo, res_hi, rl_src2.low_reg, rl_src1.low_reg);
NewLIR4(kThumb2Mla, tmp1, rl_src1.low_reg, rl_src2.high_reg, tmp1);
NewLIR4(kThumb2AddRRR, res_hi, tmp1, res_hi, 0);
if (special_case) {
FreeTemp(rl_src1.low_reg);
Clobber(rl_src1.low_reg);
Clobber(rl_src1.high_reg);
}
}
FreeTemp(tmp1);
rl_result = GetReturnWide(false); // Just using as a template.
rl_result.low_reg = res_lo;
rl_result.high_reg = res_hi;
StoreValueWide(rl_dest, rl_result);
// Now, restore lr to its non-temp status.
Clobber(rARM_LR);
UnmarkTemp(rARM_LR);
}
void ArmMir2Lir::GenAddLong(RegLocation rl_dest, RegLocation rl_src1,
RegLocation rl_src2) {
LOG(FATAL) << "Unexpected use of GenAddLong for Arm";
}
void ArmMir2Lir::GenSubLong(RegLocation rl_dest, RegLocation rl_src1,
RegLocation rl_src2) {
LOG(FATAL) << "Unexpected use of GenSubLong for Arm";
}
void ArmMir2Lir::GenAndLong(RegLocation rl_dest, RegLocation rl_src1,
RegLocation rl_src2) {
LOG(FATAL) << "Unexpected use of GenAndLong for Arm";
}
void ArmMir2Lir::GenOrLong(RegLocation rl_dest, RegLocation rl_src1,
RegLocation rl_src2) {
LOG(FATAL) << "Unexpected use of GenOrLong for Arm";
}
void ArmMir2Lir::GenXorLong(RegLocation rl_dest, RegLocation rl_src1,
RegLocation rl_src2) {
LOG(FATAL) << "Unexpected use of genXoLong for Arm";
}
/*
* Generate array load
*/
void ArmMir2Lir::GenArrayGet(int opt_flags, OpSize size, RegLocation rl_array,
RegLocation rl_index, RegLocation rl_dest, int scale) {
RegisterClass reg_class = oat_reg_class_by_size(size);
int len_offset = mirror::Array::LengthOffset().Int32Value();
int data_offset;
RegLocation rl_result;
bool constant_index = rl_index.is_const;
rl_array = LoadValue(rl_array, kCoreReg);
if (!constant_index) {
rl_index = LoadValue(rl_index, kCoreReg);
}
if (rl_dest.wide) {
data_offset = mirror::Array::DataOffset(sizeof(int64_t)).Int32Value();
} else {
data_offset = mirror::Array::DataOffset(sizeof(int32_t)).Int32Value();
}
// If index is constant, just fold it into the data offset
if (constant_index) {
data_offset += mir_graph_->ConstantValue(rl_index) << scale;
}
/* null object? */
GenNullCheck(rl_array.s_reg_low, rl_array.low_reg, opt_flags);
bool needs_range_check = (!(opt_flags & MIR_IGNORE_RANGE_CHECK));
int reg_len = INVALID_REG;
if (needs_range_check) {
reg_len = AllocTemp();
/* Get len */
LoadWordDisp(rl_array.low_reg, len_offset, reg_len);
}
if (rl_dest.wide || rl_dest.fp || constant_index) {
int reg_ptr;
if (constant_index) {
reg_ptr = rl_array.low_reg; // NOTE: must not alter reg_ptr in constant case.
} else {
// No special indexed operation, lea + load w/ displacement
reg_ptr = AllocTemp();
OpRegRegRegShift(kOpAdd, reg_ptr, rl_array.low_reg, rl_index.low_reg,
EncodeShift(kArmLsl, scale));
FreeTemp(rl_index.low_reg);
}
rl_result = EvalLoc(rl_dest, reg_class, true);
if (needs_range_check) {
if (constant_index) {
GenImmedCheck(kCondLs, reg_len, mir_graph_->ConstantValue(rl_index), kThrowConstantArrayBounds);
} else {
GenRegRegCheck(kCondLs, reg_len, rl_index.low_reg, kThrowArrayBounds);
}
FreeTemp(reg_len);
}
if (rl_dest.wide) {
LoadBaseDispWide(reg_ptr, data_offset, rl_result.low_reg, rl_result.high_reg, INVALID_SREG);
if (!constant_index) {
FreeTemp(reg_ptr);
}
StoreValueWide(rl_dest, rl_result);
} else {
LoadBaseDisp(reg_ptr, data_offset, rl_result.low_reg, size, INVALID_SREG);
if (!constant_index) {
FreeTemp(reg_ptr);
}
StoreValue(rl_dest, rl_result);
}
} else {
// Offset base, then use indexed load
int reg_ptr = AllocTemp();
OpRegRegImm(kOpAdd, reg_ptr, rl_array.low_reg, data_offset);
FreeTemp(rl_array.low_reg);
rl_result = EvalLoc(rl_dest, reg_class, true);
if (needs_range_check) {
// TODO: change kCondCS to a more meaningful name, is the sense of
// carry-set/clear flipped?
GenRegRegCheck(kCondCs, rl_index.low_reg, reg_len, kThrowArrayBounds);
FreeTemp(reg_len);
}
LoadBaseIndexed(reg_ptr, rl_index.low_reg, rl_result.low_reg, scale, size);
FreeTemp(reg_ptr);
StoreValue(rl_dest, rl_result);
}
}
/*
* Generate array store
*
*/
void ArmMir2Lir::GenArrayPut(int opt_flags, OpSize size, RegLocation rl_array,
RegLocation rl_index, RegLocation rl_src, int scale, bool card_mark) {
RegisterClass reg_class = oat_reg_class_by_size(size);
int len_offset = mirror::Array::LengthOffset().Int32Value();
bool constant_index = rl_index.is_const;
int data_offset;
if (size == kLong || size == kDouble) {
data_offset = mirror::Array::DataOffset(sizeof(int64_t)).Int32Value();
} else {
data_offset = mirror::Array::DataOffset(sizeof(int32_t)).Int32Value();
}
// If index is constant, just fold it into the data offset.
if (constant_index) {
data_offset += mir_graph_->ConstantValue(rl_index) << scale;
}
rl_array = LoadValue(rl_array, kCoreReg);
if (!constant_index) {
rl_index = LoadValue(rl_index, kCoreReg);
}
int reg_ptr;
bool allocated_reg_ptr_temp = false;
if (constant_index) {
reg_ptr = rl_array.low_reg;
} else if (IsTemp(rl_array.low_reg) && !card_mark) {
Clobber(rl_array.low_reg);
reg_ptr = rl_array.low_reg;
} else {
allocated_reg_ptr_temp = true;
reg_ptr = AllocTemp();
}
/* null object? */
GenNullCheck(rl_array.s_reg_low, rl_array.low_reg, opt_flags);
bool needs_range_check = (!(opt_flags & MIR_IGNORE_RANGE_CHECK));
int reg_len = INVALID_REG;
if (needs_range_check) {
reg_len = AllocTemp();
// NOTE: max live temps(4) here.
/* Get len */
LoadWordDisp(rl_array.low_reg, len_offset, reg_len);
}
/* at this point, reg_ptr points to array, 2 live temps */
if (rl_src.wide || rl_src.fp || constant_index) {
if (rl_src.wide) {
rl_src = LoadValueWide(rl_src, reg_class);
} else {
rl_src = LoadValue(rl_src, reg_class);
}
if (!constant_index) {
OpRegRegRegShift(kOpAdd, reg_ptr, rl_array.low_reg, rl_index.low_reg,
EncodeShift(kArmLsl, scale));
}
if (needs_range_check) {
if (constant_index) {
GenImmedCheck(kCondLs, reg_len, mir_graph_->ConstantValue(rl_index), kThrowConstantArrayBounds);
} else {
GenRegRegCheck(kCondLs, reg_len, rl_index.low_reg, kThrowArrayBounds);
}
FreeTemp(reg_len);
}
if (rl_src.wide) {
StoreBaseDispWide(reg_ptr, data_offset, rl_src.low_reg, rl_src.high_reg);
} else {
StoreBaseDisp(reg_ptr, data_offset, rl_src.low_reg, size);
}
} else {
/* reg_ptr -> array data */
OpRegRegImm(kOpAdd, reg_ptr, rl_array.low_reg, data_offset);
rl_src = LoadValue(rl_src, reg_class);
if (needs_range_check) {
GenRegRegCheck(kCondCs, rl_index.low_reg, reg_len, kThrowArrayBounds);
FreeTemp(reg_len);
}
StoreBaseIndexed(reg_ptr, rl_index.low_reg, rl_src.low_reg,
scale, size);
}
if (allocated_reg_ptr_temp) {
FreeTemp(reg_ptr);
}
if (card_mark) {
MarkGCCard(rl_src.low_reg, rl_array.low_reg);
}
}
void ArmMir2Lir::GenShiftImmOpLong(Instruction::Code opcode,
RegLocation rl_dest, RegLocation rl_src, RegLocation rl_shift) {
rl_src = LoadValueWide(rl_src, kCoreReg);
// Per spec, we only care about low 6 bits of shift amount.
int shift_amount = mir_graph_->ConstantValue(rl_shift) & 0x3f;
if (shift_amount == 0) {
StoreValueWide(rl_dest, rl_src);
return;
}
if (BadOverlap(rl_src, rl_dest)) {
GenShiftOpLong(opcode, rl_dest, rl_src, rl_shift);
return;
}
RegLocation rl_result = EvalLoc(rl_dest, kCoreReg, true);
switch (opcode) {
case Instruction::SHL_LONG:
case Instruction::SHL_LONG_2ADDR:
if (shift_amount == 1) {
OpRegRegReg(kOpAdd, rl_result.low_reg, rl_src.low_reg, rl_src.low_reg);
OpRegRegReg(kOpAdc, rl_result.high_reg, rl_src.high_reg, rl_src.high_reg);
} else if (shift_amount == 32) {
OpRegCopy(rl_result.high_reg, rl_src.low_reg);
LoadConstant(rl_result.low_reg, 0);
} else if (shift_amount > 31) {
OpRegRegImm(kOpLsl, rl_result.high_reg, rl_src.low_reg, shift_amount - 32);
LoadConstant(rl_result.low_reg, 0);
} else {
OpRegRegImm(kOpLsl, rl_result.high_reg, rl_src.high_reg, shift_amount);
OpRegRegRegShift(kOpOr, rl_result.high_reg, rl_result.high_reg, rl_src.low_reg,
EncodeShift(kArmLsr, 32 - shift_amount));
OpRegRegImm(kOpLsl, rl_result.low_reg, rl_src.low_reg, shift_amount);
}
break;
case Instruction::SHR_LONG:
case Instruction::SHR_LONG_2ADDR:
if (shift_amount == 32) {
OpRegCopy(rl_result.low_reg, rl_src.high_reg);
OpRegRegImm(kOpAsr, rl_result.high_reg, rl_src.high_reg, 31);
} else if (shift_amount > 31) {
OpRegRegImm(kOpAsr, rl_result.low_reg, rl_src.high_reg, shift_amount - 32);
OpRegRegImm(kOpAsr, rl_result.high_reg, rl_src.high_reg, 31);
} else {
int t_reg = AllocTemp();
OpRegRegImm(kOpLsr, t_reg, rl_src.low_reg, shift_amount);
OpRegRegRegShift(kOpOr, rl_result.low_reg, t_reg, rl_src.high_reg,
EncodeShift(kArmLsl, 32 - shift_amount));
FreeTemp(t_reg);
OpRegRegImm(kOpAsr, rl_result.high_reg, rl_src.high_reg, shift_amount);
}
break;
case Instruction::USHR_LONG:
case Instruction::USHR_LONG_2ADDR:
if (shift_amount == 32) {
OpRegCopy(rl_result.low_reg, rl_src.high_reg);
LoadConstant(rl_result.high_reg, 0);
} else if (shift_amount > 31) {
OpRegRegImm(kOpLsr, rl_result.low_reg, rl_src.high_reg, shift_amount - 32);
LoadConstant(rl_result.high_reg, 0);
} else {
int t_reg = AllocTemp();
OpRegRegImm(kOpLsr, t_reg, rl_src.low_reg, shift_amount);
OpRegRegRegShift(kOpOr, rl_result.low_reg, t_reg, rl_src.high_reg,
EncodeShift(kArmLsl, 32 - shift_amount));
FreeTemp(t_reg);
OpRegRegImm(kOpLsr, rl_result.high_reg, rl_src.high_reg, shift_amount);
}
break;
default:
LOG(FATAL) << "Unexpected case";
}
StoreValueWide(rl_dest, rl_result);
}
void ArmMir2Lir::GenArithImmOpLong(Instruction::Code opcode,
RegLocation rl_dest, RegLocation rl_src1, RegLocation rl_src2) {
if ((opcode == Instruction::SUB_LONG_2ADDR) || (opcode == Instruction::SUB_LONG)) {
if (!rl_src2.is_const) {
// Don't bother with special handling for subtract from immediate.
GenArithOpLong(opcode, rl_dest, rl_src1, rl_src2);
return;
}
} else {
// Normalize
if (!rl_src2.is_const) {
DCHECK(rl_src1.is_const);
RegLocation rl_temp = rl_src1;
rl_src1 = rl_src2;
rl_src2 = rl_temp;
}
}
if (BadOverlap(rl_src1, rl_dest)) {
GenArithOpLong(opcode, rl_dest, rl_src1, rl_src2);
return;
}
DCHECK(rl_src2.is_const);
int64_t val = mir_graph_->ConstantValueWide(rl_src2);
uint32_t val_lo = Low32Bits(val);
uint32_t val_hi = High32Bits(val);
int32_t mod_imm_lo = ModifiedImmediate(val_lo);
int32_t mod_imm_hi = ModifiedImmediate(val_hi);
// Only a subset of add/sub immediate instructions set carry - so bail if we don't fit
switch (opcode) {
case Instruction::ADD_LONG:
case Instruction::ADD_LONG_2ADDR:
case Instruction::SUB_LONG:
case Instruction::SUB_LONG_2ADDR:
if ((mod_imm_lo < 0) || (mod_imm_hi < 0)) {
GenArithOpLong(opcode, rl_dest, rl_src1, rl_src2);
return;
}
break;
default:
break;
}
rl_src1 = LoadValueWide(rl_src1, kCoreReg);
RegLocation rl_result = EvalLoc(rl_dest, kCoreReg, true);
// NOTE: once we've done the EvalLoc on dest, we can no longer bail.
switch (opcode) {
case Instruction::ADD_LONG:
case Instruction::ADD_LONG_2ADDR:
NewLIR3(kThumb2AddRRI8, rl_result.low_reg, rl_src1.low_reg, mod_imm_lo);
NewLIR3(kThumb2AdcRRI8, rl_result.high_reg, rl_src1.high_reg, mod_imm_hi);
break;
case Instruction::OR_LONG:
case Instruction::OR_LONG_2ADDR:
if ((val_lo != 0) || (rl_result.low_reg != rl_src1.low_reg)) {
OpRegRegImm(kOpOr, rl_result.low_reg, rl_src1.low_reg, val_lo);
}
if ((val_hi != 0) || (rl_result.high_reg != rl_src1.high_reg)) {
OpRegRegImm(kOpOr, rl_result.high_reg, rl_src1.high_reg, val_hi);
}
break;
case Instruction::XOR_LONG:
case Instruction::XOR_LONG_2ADDR:
OpRegRegImm(kOpXor, rl_result.low_reg, rl_src1.low_reg, val_lo);
OpRegRegImm(kOpXor, rl_result.high_reg, rl_src1.high_reg, val_hi);
break;
case Instruction::AND_LONG:
case Instruction::AND_LONG_2ADDR:
if ((val_lo != 0xffffffff) || (rl_result.low_reg != rl_src1.low_reg)) {
OpRegRegImm(kOpAnd, rl_result.low_reg, rl_src1.low_reg, val_lo);
}
if ((val_hi != 0xffffffff) || (rl_result.high_reg != rl_src1.high_reg)) {
OpRegRegImm(kOpAnd, rl_result.high_reg, rl_src1.high_reg, val_hi);
}
break;
case Instruction::SUB_LONG_2ADDR:
case Instruction::SUB_LONG:
NewLIR3(kThumb2SubRRI8, rl_result.low_reg, rl_src1.low_reg, mod_imm_lo);
NewLIR3(kThumb2SbcRRI8, rl_result.high_reg, rl_src1.high_reg, mod_imm_hi);
break;
default:
LOG(FATAL) << "Unexpected opcode " << opcode;
}
StoreValueWide(rl_dest, rl_result);
}
} // namespace art