From bd419912b5a38d59a853ca35d7f8900f59d0e2f9 Mon Sep 17 00:00:00 2001
From: joevt <joevt@shaw.ca>
Date: Mon, 1 Jan 2024 04:43:46 -0800
Subject: [PATCH] ppcfpopcodes: Fix stfs*.

It should try to convert its operand to a single precision
floating point number at least.
---
 cpu/ppc/ppcfpopcodes.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/cpu/ppc/ppcfpopcodes.cpp b/cpu/ppc/ppcfpopcodes.cpp
index befbcbf..166de7a 100644
--- a/cpu/ppc/ppcfpopcodes.cpp
+++ b/cpu/ppc/ppcfpopcodes.cpp
@@ -779,7 +779,8 @@ void dppc_interpreter::ppc_stfs() {
     ppc_grab_regsfpsia();
     ppc_effective_address = (int32_t)((int16_t)(ppc_cur_instruction & 0xFFFF));
     ppc_effective_address += (reg_a) ? val_reg_a : 0;
-    mmu_write_vmem<uint32_t>(ppc_effective_address, uint32_t(ppc_state.fpr[reg_s].int64_r));
+    float result = ppc_state.fpr[reg_s].dbl64_r;
+    mmu_write_vmem<uint32_t>(ppc_effective_address, uint32_t(result));
 }
 
 void dppc_interpreter::ppc_stfsu() {
@@ -787,7 +788,8 @@ void dppc_interpreter::ppc_stfsu() {
     if (reg_a != 0) {
         ppc_effective_address = (int32_t)((int16_t)(ppc_cur_instruction & 0xFFFF));
         ppc_effective_address += val_reg_a;
-        mmu_write_vmem<uint32_t>(ppc_effective_address, uint32_t(ppc_state.fpr[reg_s].int64_r));
+        float result = ppc_state.fpr[reg_s].dbl64_r;
+        mmu_write_vmem<uint32_t>(ppc_effective_address, uint32_t(result));
         ppc_state.gpr[reg_a] = ppc_effective_address;
     } else {
         ppc_exception_handler(Except_Type::EXC_PROGRAM, Exc_Cause::ILLEGAL_OP);
@@ -797,14 +799,16 @@ void dppc_interpreter::ppc_stfsu() {
 void dppc_interpreter::ppc_stfsx() {
     ppc_grab_regsfpsiab();
     ppc_effective_address = (reg_a) ? val_reg_a + val_reg_b : val_reg_b;
-    mmu_write_vmem<uint32_t>(ppc_effective_address, uint32_t(ppc_state.fpr[reg_s].int64_r));
+    float result = ppc_state.fpr[reg_s].dbl64_r;
+    mmu_write_vmem<uint32_t>(ppc_effective_address, uint32_t(result));
 }
 
 void dppc_interpreter::ppc_stfsux() {
     ppc_grab_regsfpsiab();
     if (reg_a) {
         ppc_effective_address = val_reg_a + val_reg_b;
-        mmu_write_vmem<uint32_t>(ppc_effective_address, uint32_t(ppc_state.fpr[reg_s].int64_r));
+        float result = ppc_state.fpr[reg_s].dbl64_r;
+        mmu_write_vmem<uint32_t>(ppc_effective_address, uint32_t(result));
         ppc_state.gpr[reg_a] = ppc_effective_address;
     } else {
         ppc_exception_handler(Except_Type::EXC_PROGRAM, Exc_Cause::ILLEGAL_OP);