From 8cf39971a75cea52aed8c8714166d9a5b12d3d7b Mon Sep 17 00:00:00 2001
From: Crementif <26669564+Crementif@users.noreply.github.com>
Date: Sat, 5 Sep 2026 16:30:59 +0200
Subject: [PATCH] PPCRec: Fix subfic carry when subtracting from -1

---
 src/Cafe/HW/Espresso/Recompiler/PPCRecompilerImlGen.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Cafe/HW/Espresso/Recompiler/PPCRecompilerImlGen.cpp b/src/Cafe/HW/Espresso/Recompiler/PPCRecompilerImlGen.cpp
index ec24aa22..89e805d9 100644
--- a/src/Cafe/HW/Espresso/Recompiler/PPCRecompilerImlGen.cpp
+++ b/src/Cafe/HW/Espresso/Recompiler/PPCRecompilerImlGen.cpp
@@ -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;
 }