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Implement some ARM32 memory instructions and CMP (#565)

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* Implement ARM32 memory instructions: LDM, LDR, LDRB, LDRD, LDRH, LDRSB, LDRSH, STM, STR, STRB, STRD, STRH (immediate and register + immediate variants), implement CMP (immediate and register shifted by immediate variants)

* Rename some opcode classes and flag masks for consistency

* Fix a few suboptimal ARM32 codegen issues, only loads should be considered on decoder when checking if Rt == PC, and only NZCV flags should be considered for comparison optimizations

* Take into account Rt2 for LDRD instructions aswell when checking if the instruction changes PC

* Re-align arm32 instructions on the opcode table
This commit is contained in:
gdkchan 2019-01-29 13:06:11 -03:00 • committed by GitHub
parent 8f7fcede7f
commit c1bdf19061
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29 changed files with 686 additions and 87 deletions
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10
ChocolArm64/Translation/ILEmitterCtx.cs
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@ -530,7 +530,15 @@ namespace ChocolArm64.Translation
public void EmitLdflg(int index) => Ldloc(index, IoType.Flag);
public void EmitStflg(int index)
{
_optOpLastFlagSet = CurrOp;
//Set this only if any of the NZCV flag bits were modified.
//This is used to ensure that, when emiting a direct IL branch
//instruction for compare + branch sequences, we're not expecting
//to use comparison values from an old instruction, when in fact
//the flags were already overwritten by another instruction further along.
if (index >= (int)PState.VBit)
{
_optOpLastFlagSet = CurrOp;
}
Stloc(index, IoType.Flag);
}