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PPCRec: Fix subfic carry when subtracting from -1
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This commit is contained in:
Crementif
2026-09-05 16:30:59 +02:00
parent 9a5b3301b2
commit 8cf39971a7
1 changed files with 3 additions and 1 deletions
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src/Cafe/HW/Espresso/Recompiler/PPCRecompilerImlGen.cpp
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@@ -975,7 +975,9 @@ bool PPCRecompilerImlGen_SUBFIC(ppcImlGenContext_t* ppcImlGenContext, uint32 opc
IMLReg regCa = PPCRecompilerImlGen_loadRegister(ppcImlGenContext, PPCREC_NAME_XER_CA);
IMLReg regTmp = PPCRecompilerImlGen_loadRegister(ppcImlGenContext, PPCREC_NAME_TEMPORARY + 0);
ppcImlGenContext->emitInst().make_r_r(PPCREC_IML_OP_NOT, regTmp, regA);
ppcImlGenContext->emitInst().make_r_r_s32_carry(PPCREC_IML_OP_ADD, regD, regTmp, (sint32)imm + 1, regCa);
// imm + 1 wraps for imm == -1, which drops the carry. pass the +1 as input carry instead
ppcImlGenContext->emitInst().make_r_s32(PPCREC_IML_OP_ASSIGN, regCa, 1);
ppcImlGenContext->emitInst().make_r_r_s32_carry(PPCREC_IML_OP_ADD_WITH_CARRY, regD, regTmp, (sint32)imm, regCa);
return true;
}