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Optmize BFM instruction (#607)

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gdkchan 2019-02-26 06:16:50 -03:00 committed by jduncanator
parent f1217a4ce9
commit fca693a696
1 changed files with 45 additions and 10 deletions
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45
Instructions/InstEmitBfm.cs
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@ -11,22 +11,57 @@ namespace ChocolArm64.Instructions
{
OpCodeBfm64 op = (OpCodeBfm64)context.CurrOp;
EmitBfmLoadRn(context);
if (op.Pos < op.Shift)
{
//BFI.
context.EmitLdintzr(op.Rn);
context.EmitLdintzr(op.Rd);
context.EmitLdc_I(~op.WMask & op.TMask);
int shift = op.GetBitsCount() - op.Shift;
int width = op.Pos + 1;
long mask = (long)(ulong.MaxValue >> (64 - width));
context.EmitLdc_I(mask);
context.Emit(OpCodes.And);
context.Emit(OpCodes.Or);
context.EmitLsl(shift);
context.EmitLdintzr(op.Rd);
context.EmitLdc_I(~op.TMask);
context.EmitLdc_I(~(mask << shift));
context.Emit(OpCodes.And);
context.Emit(OpCodes.Or);
context.EmitStintzr(op.Rd);
}
else
{
//BFXIL.
context.EmitLdintzr(op.Rn);
context.EmitLsr(op.Shift);
int width = op.Pos - op.Shift + 1;
long mask = (long)(ulong.MaxValue >> (64 - width));
context.EmitLdc_I(mask);
context.Emit(OpCodes.And);
context.EmitLdintzr(op.Rd);
context.EmitLdc_I(~mask);
context.Emit(OpCodes.And);
context.Emit(OpCodes.Or);
context.EmitStintzr(op.Rd);
}
}
public static void Sbfm(ILEmitterCtx context)
{