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| author | gdkchan <gab.dark.100@gmail.com> | 2019-02-26 06:16:50 -0300 |
|---|---|---|
| committer | jduncanator <1518948+jduncanator@users.noreply.github.com> | 2019-02-26 20:16:50 +1100 |
| commit | ef3f9a2abe85cfd572ab6bec73481e3526762dcc (patch) | |
| tree | b11a6b2ac91848021c45eafd45d4e02b0de74c0d | |
| parent | 504f4f4abfd34696699fbf484264404f3011ec17 (diff) | |
Optmize BFM instruction (#607)
| -rw-r--r-- | ChocolArm64/Instructions/InstEmitBfm.cs | 55 |
1 files changed, 45 insertions, 10 deletions
diff --git a/ChocolArm64/Instructions/InstEmitBfm.cs b/ChocolArm64/Instructions/InstEmitBfm.cs index d25af8be..4a039599 100644 --- a/ChocolArm64/Instructions/InstEmitBfm.cs +++ b/ChocolArm64/Instructions/InstEmitBfm.cs @@ -11,21 +11,56 @@ 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; - context.Emit(OpCodes.And); - context.Emit(OpCodes.Or); + int width = op.Pos + 1; - context.EmitLdintzr(op.Rd); - context.EmitLdc_I(~op.TMask); + long mask = (long)(ulong.MaxValue >> (64 - width)); - context.Emit(OpCodes.And); - context.Emit(OpCodes.Or); + context.EmitLdc_I(mask); - context.EmitStintzr(op.Rd); + context.Emit(OpCodes.And); + + context.EmitLsl(shift); + + context.EmitLdintzr(op.Rd); + + 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) |