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GP-0: Add PowerPC VLE Saturating Arithmetic Instructions #8829

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GP-0: Add PowerPC VLE Saturating Arithmetic Instructions #8829

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73 changes: 73 additions & 0 deletions Ghidra/Processors/PowerPC/data/languages/ppc_vle.sinc
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Original file line number Diff line number Diff line change
Expand Up @@ -953,3 +953,76 @@ IMM16B: val is IMM_0_10_VLE & IMM_16_20_VLE [ val = (IMM_16_20_VLE << 11) |
:se_isync is $(ISVLE) & OP16_VLE=1 {
instructionSynchronize();
}

# =================================================================
# Saturating Arithmetic Instructions

# e_addwus - Add Word Unsigned Saturate
:e_addwus D,A,B is $(ISVLE) & OP=31 & D & A & B & XOP_1_10=0x36A & BIT_0=0
{
tmpA:4 = A:4;
tmpB:4 = B:4;
tmpResult:4 = tmpA + tmpB;
if (!carry(tmpA, tmpB)) goto <no_overflow>;
D = 0xFFFFFFFF;
goto <done>;
<no_overflow>
D = zext(tmpResult);
<done>
}

# e_addhus - Add Halfword Unsigned Saturate
:e_addhus D,A,B is $(ISVLE) & OP=31 & D & A & B & XOP_1_10=0x3AA & BIT_0=0
{
tmpA:2 = A:2;
tmpB:2 = B:2;
tmpResult:2 = tmpA + tmpB;
if (!carry(tmpA, tmpB)) goto <no_overflow>;
D = 0xFFFF;
goto <done>;
<no_overflow>
D = zext(tmpResult);
<done>
}

# e_addbus - Add Byte Unsigned Saturate
:e_addbus D,A,B is $(ISVLE) & OP=31 & D & A & B & XOP_1_10=0x3EA & BIT_0=0
{
tmpA:1 = A:1;
tmpB:1 = B:1;
tmpResult:1 = tmpA + tmpB;
if (!carry(tmpA, tmpB)) goto <no_overflow>;
D = 0xFF;
goto <done>;
<no_overflow>
D = zext(tmpResult);
<done>
}

# e_subfhus - Subtract Halfword Unsigned Saturate
:e_subfhus D,A,B is $(ISVLE) & OP=31 & D & A & B & XOP_1_10=0x3A8 & BIT_0=0
{
tmpA:2 = A:2;
tmpB:2 = B:2;
tmpResult:2 = tmpB - tmpA;
if (tmpA <= tmpB) goto <no_underflow>;
D = 0;
goto <done>;
<no_underflow>
D = zext(tmpResult);
<done>
}

# e_subfbus - Subtract Byte Unsigned Saturate
:e_subfbus D,A,B is $(ISVLE) & OP=31 & D & A & B & XOP_1_10=0x3E8 & BIT_0=0
{
tmpA:1 = A:1;
tmpB:1 = B:1;
tmpResult:1 = tmpB - tmpA;
if (tmpA <= tmpB) goto <no_underflow>;
D = 0;
goto <done>;
<no_underflow>
D = zext(tmpResult);
<done>
}