22b2cb39af
* Turn `MemoryOperand` into a struct
* Remove `IntrinsicOperation`
* Remove `PhiNode`
* Remove `Node`
* Turn `Operand` into a struct
* Turn `Operation` into a struct
* Clean up pool management methods
* Add `Arena` allocator
* Move `OperationHelper` to `Operation.Factory`
* Move `OperandHelper` to `Operand.Factory`
* Optimize `Operation` a bit
* Fix `Arena` initialization
* Rename `NativeList<T>` to `ArenaList<T>`
* Reduce `Operand` size from 88 to 56 bytes
* Reduce `Operation` size from 56 to 40 bytes
* Add optimistic interning of Register & Constant operands
* Optimize `RegisterUsage` pass a bit
* Optimize `RemoveUnusedNodes` pass a bit
Iterating in reverse-order allows killing dependency chains in a single
pass.
* Fix PPTC symbols
* Optimize `BasicBlock` a bit
Reduce allocations from `_successor` & `DominanceFrontiers`
* Fix `Operation` resize
* Make `Arena` expandable
Change the arena allocator to be expandable by allocating in pages, with
some of them being pooled. Currently 32 pages are pooled. An LRU removal
mechanism should probably be added to it.
Apparently MHR can allocate bitmaps large enough to exceed the 16MB
limit for the type.
* Move `Arena` & `ArenaList` to `Common`
* Remove `ThreadStaticPool` & co
* Add `PhiOperation`
* Reduce `Operand` size from 56 from 48 bytes
* Add linear-probing to `Operand` intern table
* Optimize `HybridAllocator` a bit
* Add `Allocators` class
* Tune `ArenaAllocator` sizes
* Add page removal mechanism to `ArenaAllocator`
Remove pages which have not been used for more than 5s after each reset.
I am on fence if this would be better using a Gen2 callback object like
the one in System.Buffers.ArrayPool<T>, to trim the pool. Because right
now if a large translation happens, the pages will be freed only after a
reset. This reset may not happen for a while because no new translation
is hit, but the arena base sizes are rather small.
* Fix `OOM` when allocating larger than page size in `ArenaAllocator`
Tweak resizing mechanism for Operand.Uses and Assignemnts.
* Optimize `Optimizer` a bit
* Optimize `Operand.Add<T>/Remove<T>` a bit
* Clean up `PreAllocator`
* Fix phi insertion order
Reduce codegen diffs.
* Fix code alignment
* Use new heuristics for degree of parallelism
* Suppress warnings
* Address gdkchan's feedback
Renamed `GetValue()` to `GetValueUnsafe()` to make it more clear that
`Operand.Value` should usually not be modified directly.
* Add fast path to `ArenaAllocator`
* Assembly for `ArenaAllocator.Allocate(ulong)`:
.L0:
mov rax, [rcx+0x18]
lea r8, [rax+rdx]
cmp r8, [rcx+0x10]
ja short .L2
.L1:
mov rdx, [rcx+8]
add rax, [rdx+8]
mov [rcx+0x18], r8
ret
.L2:
jmp ArenaAllocator.AllocateSlow(UInt64)
A few variable/field had to be changed to ulong so that RyuJIT avoids
emitting zero-extends.
* Implement a new heuristic to free pooled pages.
If an arena is used often, it is more likely that its pages will be
needed, so the pages are kept for longer (e.g: during PPTC rebuild or
burst sof compilations). If is not used often, then it is more likely
that its pages will not be needed (e.g: after PPTC rebuild or bursts
of compilations).
* Address riperiperi's feedback
* Use `EqualityComparer<T>` in `IntrusiveList<T>`
Avoids a potential GC hole in `Equals(T, T)`.
603 lines
20 KiB
C#
603 lines
20 KiB
C#
using ARMeilleure.Decoders;
|
|
using ARMeilleure.IntermediateRepresentation;
|
|
using ARMeilleure.State;
|
|
using ARMeilleure.Translation;
|
|
using System;
|
|
using System.Diagnostics;
|
|
|
|
using static ARMeilleure.Instructions.InstEmitHelper;
|
|
using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
|
|
|
|
namespace ARMeilleure.Instructions
|
|
{
|
|
static class InstEmitAluHelper
|
|
{
|
|
public static void EmitNZFlagsCheck(ArmEmitterContext context, Operand d)
|
|
{
|
|
SetFlag(context, PState.NFlag, context.ICompareLess (d, Const(d.Type, 0)));
|
|
SetFlag(context, PState.ZFlag, context.ICompareEqual(d, Const(d.Type, 0)));
|
|
}
|
|
|
|
public static void EmitAdcsCCheck(ArmEmitterContext context, Operand n, Operand d)
|
|
{
|
|
// C = (Rd == Rn && CIn) || Rd < Rn
|
|
Operand cIn = GetFlag(PState.CFlag);
|
|
|
|
Operand cOut = context.BitwiseAnd(context.ICompareEqual(d, n), cIn);
|
|
|
|
cOut = context.BitwiseOr(cOut, context.ICompareLessUI(d, n));
|
|
|
|
SetFlag(context, PState.CFlag, cOut);
|
|
}
|
|
|
|
public static void EmitAddsCCheck(ArmEmitterContext context, Operand n, Operand d)
|
|
{
|
|
// C = Rd < Rn
|
|
SetFlag(context, PState.CFlag, context.ICompareLessUI(d, n));
|
|
}
|
|
|
|
public static void EmitAddsVCheck(ArmEmitterContext context, Operand n, Operand m, Operand d)
|
|
{
|
|
// V = (Rd ^ Rn) & ~(Rn ^ Rm) < 0
|
|
Operand vOut = context.BitwiseExclusiveOr(d, n);
|
|
|
|
vOut = context.BitwiseAnd(vOut, context.BitwiseNot(context.BitwiseExclusiveOr(n, m)));
|
|
|
|
vOut = context.ICompareLess(vOut, Const(vOut.Type, 0));
|
|
|
|
SetFlag(context, PState.VFlag, vOut);
|
|
}
|
|
|
|
public static void EmitSbcsCCheck(ArmEmitterContext context, Operand n, Operand m)
|
|
{
|
|
// C = (Rn == Rm && CIn) || Rn > Rm
|
|
Operand cIn = GetFlag(PState.CFlag);
|
|
|
|
Operand cOut = context.BitwiseAnd(context.ICompareEqual(n, m), cIn);
|
|
|
|
cOut = context.BitwiseOr(cOut, context.ICompareGreaterUI(n, m));
|
|
|
|
SetFlag(context, PState.CFlag, cOut);
|
|
}
|
|
|
|
public static void EmitSubsCCheck(ArmEmitterContext context, Operand n, Operand m)
|
|
{
|
|
// C = Rn >= Rm
|
|
SetFlag(context, PState.CFlag, context.ICompareGreaterOrEqualUI(n, m));
|
|
}
|
|
|
|
public static void EmitSubsVCheck(ArmEmitterContext context, Operand n, Operand m, Operand d)
|
|
{
|
|
// V = (Rd ^ Rn) & (Rn ^ Rm) < 0
|
|
Operand vOut = context.BitwiseExclusiveOr(d, n);
|
|
|
|
vOut = context.BitwiseAnd(vOut, context.BitwiseExclusiveOr(n, m));
|
|
|
|
vOut = context.ICompareLess(vOut, Const(vOut.Type, 0));
|
|
|
|
SetFlag(context, PState.VFlag, vOut);
|
|
}
|
|
|
|
public static Operand EmitReverseBits32Op(ArmEmitterContext context, Operand op)
|
|
{
|
|
Debug.Assert(op.Type == OperandType.I32);
|
|
|
|
Operand val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op, Const(0xaaaaaaaau)), Const(1)),
|
|
context.ShiftLeft(context.BitwiseAnd(op, Const(0x55555555u)), Const(1)));
|
|
|
|
val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xccccccccu)), Const(2)),
|
|
context.ShiftLeft(context.BitwiseAnd(val, Const(0x33333333u)), Const(2)));
|
|
val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xf0f0f0f0u)), Const(4)),
|
|
context.ShiftLeft(context.BitwiseAnd(val, Const(0x0f0f0f0fu)), Const(4)));
|
|
val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xff00ff00u)), Const(8)),
|
|
context.ShiftLeft(context.BitwiseAnd(val, Const(0x00ff00ffu)), Const(8)));
|
|
|
|
return context.BitwiseOr(context.ShiftRightUI(val, Const(16)), context.ShiftLeft(val, Const(16)));
|
|
}
|
|
|
|
public static Operand EmitReverseBytes16_64Op(ArmEmitterContext context, Operand op)
|
|
{
|
|
Debug.Assert(op.Type == OperandType.I64);
|
|
|
|
return context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op, Const(0xff00ff00ff00ff00ul)), Const(8)),
|
|
context.ShiftLeft(context.BitwiseAnd(op, Const(0x00ff00ff00ff00fful)), Const(8)));
|
|
}
|
|
|
|
public static Operand EmitReverseBytes16_32Op(ArmEmitterContext context, Operand op)
|
|
{
|
|
Debug.Assert(op.Type == OperandType.I32);
|
|
|
|
Operand val = EmitReverseBytes16_64Op(context, context.ZeroExtend32(OperandType.I64, op));
|
|
|
|
return context.ConvertI64ToI32(val);
|
|
}
|
|
|
|
private static void EmitAluWritePc(ArmEmitterContext context, Operand value)
|
|
{
|
|
Debug.Assert(value.Type == OperandType.I32);
|
|
|
|
if (IsThumb(context.CurrOp))
|
|
{
|
|
bool isReturn = IsA32Return(context);
|
|
if (!isReturn)
|
|
{
|
|
context.StoreToContext();
|
|
}
|
|
|
|
InstEmitFlowHelper.EmitVirtualJump(context, value, isReturn);
|
|
}
|
|
else
|
|
{
|
|
EmitBxWritePc(context, value);
|
|
}
|
|
}
|
|
|
|
public static void EmitGenericAluStoreA32(ArmEmitterContext context, int rd, bool setFlags, Operand value)
|
|
{
|
|
Debug.Assert(value.Type == OperandType.I32);
|
|
|
|
if (rd == RegisterAlias.Aarch32Pc && setFlags)
|
|
{
|
|
if (setFlags)
|
|
{
|
|
// TODO: Load SPSR etc.
|
|
|
|
EmitBxWritePc(context, value);
|
|
}
|
|
else
|
|
{
|
|
EmitAluWritePc(context, value);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
SetIntA32(context, rd, value);
|
|
}
|
|
}
|
|
|
|
public static Operand GetAluN(ArmEmitterContext context)
|
|
{
|
|
if (context.CurrOp is IOpCodeAlu op)
|
|
{
|
|
if (op.DataOp == DataOp.Logical || op is IOpCodeAluRs)
|
|
{
|
|
return GetIntOrZR(context, op.Rn);
|
|
}
|
|
else
|
|
{
|
|
return GetIntOrSP(context, op.Rn);
|
|
}
|
|
}
|
|
else if (context.CurrOp is IOpCode32Alu op32)
|
|
{
|
|
return GetIntA32(context, op32.Rn);
|
|
}
|
|
else
|
|
{
|
|
throw InvalidOpCodeType(context.CurrOp);
|
|
}
|
|
}
|
|
|
|
public static Operand GetAluM(ArmEmitterContext context, bool setCarry = true)
|
|
{
|
|
switch (context.CurrOp)
|
|
{
|
|
// ARM32.
|
|
case OpCode32AluImm op:
|
|
{
|
|
if (op.SetFlags && op.IsRotated)
|
|
{
|
|
SetFlag(context, PState.CFlag, Const((uint)op.Immediate >> 31));
|
|
}
|
|
|
|
return Const(op.Immediate);
|
|
}
|
|
|
|
case OpCode32AluImm16 op: return Const(op.Immediate);
|
|
|
|
case OpCode32AluRsImm op: return GetMShiftedByImmediate(context, op, setCarry);
|
|
case OpCode32AluRsReg op: return GetMShiftedByReg(context, op, setCarry);
|
|
|
|
case OpCodeT16AluImm8 op: return Const(op.Immediate);
|
|
|
|
case IOpCode32AluReg op: return GetIntA32(context, op.Rm);
|
|
|
|
// ARM64.
|
|
case IOpCodeAluImm op:
|
|
{
|
|
if (op.GetOperandType() == OperandType.I32)
|
|
{
|
|
return Const((int)op.Immediate);
|
|
}
|
|
else
|
|
{
|
|
return Const(op.Immediate);
|
|
}
|
|
}
|
|
|
|
case IOpCodeAluRs op:
|
|
{
|
|
Operand value = GetIntOrZR(context, op.Rm);
|
|
|
|
switch (op.ShiftType)
|
|
{
|
|
case ShiftType.Lsl: value = context.ShiftLeft (value, Const(op.Shift)); break;
|
|
case ShiftType.Lsr: value = context.ShiftRightUI(value, Const(op.Shift)); break;
|
|
case ShiftType.Asr: value = context.ShiftRightSI(value, Const(op.Shift)); break;
|
|
case ShiftType.Ror: value = context.RotateRight (value, Const(op.Shift)); break;
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
case IOpCodeAluRx op:
|
|
{
|
|
Operand value = GetExtendedM(context, op.Rm, op.IntType);
|
|
|
|
value = context.ShiftLeft(value, Const(op.Shift));
|
|
|
|
return value;
|
|
}
|
|
|
|
default: throw InvalidOpCodeType(context.CurrOp);
|
|
}
|
|
}
|
|
|
|
private static Exception InvalidOpCodeType(OpCode opCode)
|
|
{
|
|
return new InvalidOperationException($"Invalid OpCode type \"{opCode?.GetType().Name ?? "null"}\".");
|
|
}
|
|
|
|
// ARM32 helpers.
|
|
public static Operand GetMShiftedByImmediate(ArmEmitterContext context, OpCode32AluRsImm op, bool setCarry)
|
|
{
|
|
Operand m = GetIntA32(context, op.Rm);
|
|
|
|
int shift = op.Immediate;
|
|
|
|
if (shift == 0)
|
|
{
|
|
switch (op.ShiftType)
|
|
{
|
|
case ShiftType.Lsr: shift = 32; break;
|
|
case ShiftType.Asr: shift = 32; break;
|
|
case ShiftType.Ror: shift = 1; break;
|
|
}
|
|
}
|
|
|
|
if (shift != 0)
|
|
{
|
|
setCarry &= op.SetFlags;
|
|
|
|
switch (op.ShiftType)
|
|
{
|
|
case ShiftType.Lsl: m = GetLslC(context, m, setCarry, shift); break;
|
|
case ShiftType.Lsr: m = GetLsrC(context, m, setCarry, shift); break;
|
|
case ShiftType.Asr: m = GetAsrC(context, m, setCarry, shift); break;
|
|
case ShiftType.Ror:
|
|
if (op.Immediate != 0)
|
|
{
|
|
m = GetRorC(context, m, setCarry, shift);
|
|
}
|
|
else
|
|
{
|
|
m = GetRrxC(context, m, setCarry);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return m;
|
|
}
|
|
|
|
public static int DecodeImmShift(ShiftType shiftType, int shift)
|
|
{
|
|
if (shift == 0)
|
|
{
|
|
switch (shiftType)
|
|
{
|
|
case ShiftType.Lsr: shift = 32; break;
|
|
case ShiftType.Asr: shift = 32; break;
|
|
case ShiftType.Ror: shift = 1; break;
|
|
}
|
|
}
|
|
|
|
return shift;
|
|
}
|
|
|
|
public static Operand GetMShiftedByReg(ArmEmitterContext context, OpCode32AluRsReg op, bool setCarry)
|
|
{
|
|
Operand m = GetIntA32(context, op.Rm);
|
|
Operand s = context.ZeroExtend8(OperandType.I32, GetIntA32(context, op.Rs));
|
|
Operand shiftIsZero = context.ICompareEqual(s, Const(0));
|
|
|
|
Operand zeroResult = m;
|
|
Operand shiftResult = m;
|
|
|
|
setCarry &= op.SetFlags;
|
|
|
|
switch (op.ShiftType)
|
|
{
|
|
case ShiftType.Lsl: shiftResult = EmitLslC(context, m, setCarry, s, shiftIsZero); break;
|
|
case ShiftType.Lsr: shiftResult = EmitLsrC(context, m, setCarry, s, shiftIsZero); break;
|
|
case ShiftType.Asr: shiftResult = EmitAsrC(context, m, setCarry, s, shiftIsZero); break;
|
|
case ShiftType.Ror: shiftResult = EmitRorC(context, m, setCarry, s, shiftIsZero); break;
|
|
}
|
|
|
|
return context.ConditionalSelect(shiftIsZero, zeroResult, shiftResult);
|
|
}
|
|
|
|
public static void EmitIfHelper(ArmEmitterContext context, Operand boolValue, Action action, bool expected = true)
|
|
{
|
|
Debug.Assert(boolValue.Type == OperandType.I32);
|
|
|
|
Operand endLabel = Label();
|
|
|
|
if (expected)
|
|
{
|
|
context.BranchIfFalse(endLabel, boolValue);
|
|
}
|
|
else
|
|
{
|
|
context.BranchIfTrue(endLabel, boolValue);
|
|
}
|
|
|
|
action();
|
|
|
|
context.MarkLabel(endLabel);
|
|
}
|
|
|
|
public static Operand EmitLslC(ArmEmitterContext context, Operand m, bool setCarry, Operand shift, Operand shiftIsZero)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32 && shift.Type == OperandType.I32 && shiftIsZero.Type == OperandType.I32);
|
|
|
|
Operand shiftLarge = context.ICompareGreaterOrEqual(shift, Const(32));
|
|
Operand result = context.ShiftLeft(m, shift);
|
|
if (setCarry)
|
|
{
|
|
EmitIfHelper(context, shiftIsZero, () =>
|
|
{
|
|
Operand cOut = context.ShiftRightUI(m, context.Subtract(Const(32), shift));
|
|
|
|
cOut = context.BitwiseAnd(cOut, Const(1));
|
|
cOut = context.ConditionalSelect(context.ICompareGreater(shift, Const(32)), Const(0), cOut);
|
|
|
|
SetFlag(context, PState.CFlag, cOut);
|
|
}, false);
|
|
}
|
|
|
|
return context.ConditionalSelect(shiftLarge, Const(0), result);
|
|
}
|
|
|
|
public static Operand GetLslC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
if ((uint)shift > 32)
|
|
{
|
|
return GetShiftByMoreThan32(context, setCarry);
|
|
}
|
|
else if (shift == 32)
|
|
{
|
|
if (setCarry)
|
|
{
|
|
SetCarryMLsb(context, m);
|
|
}
|
|
|
|
return Const(0);
|
|
}
|
|
else
|
|
{
|
|
if (setCarry)
|
|
{
|
|
Operand cOut = context.ShiftRightUI(m, Const(32 - shift));
|
|
|
|
cOut = context.BitwiseAnd(cOut, Const(1));
|
|
|
|
SetFlag(context, PState.CFlag, cOut);
|
|
}
|
|
|
|
return context.ShiftLeft(m, Const(shift));
|
|
}
|
|
}
|
|
|
|
public static Operand EmitLsrC(ArmEmitterContext context, Operand m, bool setCarry, Operand shift, Operand shiftIsZero)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32 && shift.Type == OperandType.I32 && shiftIsZero.Type == OperandType.I32);
|
|
|
|
Operand shiftLarge = context.ICompareGreaterOrEqual(shift, Const(32));
|
|
Operand result = context.ShiftRightUI(m, shift);
|
|
if (setCarry)
|
|
{
|
|
EmitIfHelper(context, shiftIsZero, () =>
|
|
{
|
|
Operand cOut = context.ShiftRightUI(m, context.Subtract(shift, Const(1)));
|
|
|
|
cOut = context.BitwiseAnd(cOut, Const(1));
|
|
cOut = context.ConditionalSelect(context.ICompareGreater(shift, Const(32)), Const(0), cOut);
|
|
|
|
SetFlag(context, PState.CFlag, cOut);
|
|
}, false);
|
|
}
|
|
|
|
return context.ConditionalSelect(shiftLarge, Const(0), result);
|
|
}
|
|
|
|
public static Operand GetLsrC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
if ((uint)shift > 32)
|
|
{
|
|
return GetShiftByMoreThan32(context, setCarry);
|
|
}
|
|
else if (shift == 32)
|
|
{
|
|
if (setCarry)
|
|
{
|
|
SetCarryMMsb(context, m);
|
|
}
|
|
|
|
return Const(0);
|
|
}
|
|
else
|
|
{
|
|
if (setCarry)
|
|
{
|
|
SetCarryMShrOut(context, m, shift);
|
|
}
|
|
|
|
return context.ShiftRightUI(m, Const(shift));
|
|
}
|
|
}
|
|
|
|
private static Operand GetShiftByMoreThan32(ArmEmitterContext context, bool setCarry)
|
|
{
|
|
if (setCarry)
|
|
{
|
|
SetFlag(context, PState.CFlag, Const(0));
|
|
}
|
|
|
|
return Const(0);
|
|
}
|
|
|
|
public static Operand EmitAsrC(ArmEmitterContext context, Operand m, bool setCarry, Operand shift, Operand shiftIsZero)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32 && shift.Type == OperandType.I32 && shiftIsZero.Type == OperandType.I32);
|
|
|
|
Operand l32Result;
|
|
Operand ge32Result;
|
|
|
|
Operand less32 = context.ICompareLess(shift, Const(32));
|
|
|
|
ge32Result = context.ShiftRightSI(m, Const(31));
|
|
|
|
if (setCarry)
|
|
{
|
|
EmitIfHelper(context, context.BitwiseOr(less32, shiftIsZero), () =>
|
|
{
|
|
SetCarryMLsb(context, ge32Result);
|
|
}, false);
|
|
}
|
|
|
|
l32Result = context.ShiftRightSI(m, shift);
|
|
if (setCarry)
|
|
{
|
|
EmitIfHelper(context, context.BitwiseAnd(less32, context.BitwiseNot(shiftIsZero)), () =>
|
|
{
|
|
Operand cOut = context.ShiftRightUI(m, context.Subtract(shift, Const(1)));
|
|
|
|
cOut = context.BitwiseAnd(cOut, Const(1));
|
|
|
|
SetFlag(context, PState.CFlag, cOut);
|
|
});
|
|
}
|
|
|
|
return context.ConditionalSelect(less32, l32Result, ge32Result);
|
|
}
|
|
|
|
public static Operand GetAsrC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
if ((uint)shift >= 32)
|
|
{
|
|
m = context.ShiftRightSI(m, Const(31));
|
|
|
|
if (setCarry)
|
|
{
|
|
SetCarryMLsb(context, m);
|
|
}
|
|
|
|
return m;
|
|
}
|
|
else
|
|
{
|
|
if (setCarry)
|
|
{
|
|
SetCarryMShrOut(context, m, shift);
|
|
}
|
|
|
|
return context.ShiftRightSI(m, Const(shift));
|
|
}
|
|
}
|
|
|
|
public static Operand EmitRorC(ArmEmitterContext context, Operand m, bool setCarry, Operand shift, Operand shiftIsZero)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32 && shift.Type == OperandType.I32 && shiftIsZero.Type == OperandType.I32);
|
|
|
|
shift = context.BitwiseAnd(shift, Const(0x1f));
|
|
m = context.RotateRight(m, shift);
|
|
|
|
if (setCarry)
|
|
{
|
|
EmitIfHelper(context, shiftIsZero, () =>
|
|
{
|
|
SetCarryMMsb(context, m);
|
|
}, false);
|
|
}
|
|
|
|
return m;
|
|
}
|
|
|
|
public static Operand GetRorC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
shift &= 0x1f;
|
|
|
|
m = context.RotateRight(m, Const(shift));
|
|
|
|
if (setCarry)
|
|
{
|
|
SetCarryMMsb(context, m);
|
|
}
|
|
|
|
return m;
|
|
}
|
|
|
|
public static Operand GetRrxC(ArmEmitterContext context, Operand m, bool setCarry)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
// Rotate right by 1 with carry.
|
|
Operand cIn = context.Copy(GetFlag(PState.CFlag));
|
|
|
|
if (setCarry)
|
|
{
|
|
SetCarryMLsb(context, m);
|
|
}
|
|
|
|
m = context.ShiftRightUI(m, Const(1));
|
|
|
|
m = context.BitwiseOr(m, context.ShiftLeft(cIn, Const(31)));
|
|
|
|
return m;
|
|
}
|
|
|
|
private static void SetCarryMLsb(ArmEmitterContext context, Operand m)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
SetFlag(context, PState.CFlag, context.BitwiseAnd(m, Const(1)));
|
|
}
|
|
|
|
private static void SetCarryMMsb(ArmEmitterContext context, Operand m)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
SetFlag(context, PState.CFlag, context.ShiftRightUI(m, Const(31)));
|
|
}
|
|
|
|
private static void SetCarryMShrOut(ArmEmitterContext context, Operand m, int shift)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
Operand cOut = context.ShiftRightUI(m, Const(shift - 1));
|
|
|
|
cOut = context.BitwiseAnd(cOut, Const(1));
|
|
|
|
SetFlag(context, PState.CFlag, cOut);
|
|
}
|
|
}
|
|
}
|