From fd81d7b04032602148739de3305ebb5c3728f902 Mon Sep 17 00:00:00 2001
From: joevt <joevt@shaw.ca>
Date: Sun, 4 Feb 2024 03:23:24 -0800
Subject: [PATCH] ppcfpopcodes: Fix load float.

Type casting an int to a float assigns the value of the int to the float which is not what is needed here.
---
 cpu/ppc/ppcfpopcodes.cpp | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/cpu/ppc/ppcfpopcodes.cpp b/cpu/ppc/ppcfpopcodes.cpp
index 8789bc7..8327680 100644
--- a/cpu/ppc/ppcfpopcodes.cpp
+++ b/cpu/ppc/ppcfpopcodes.cpp
@@ -681,18 +681,17 @@ void dppc_interpreter::ppc_lfs() {
     ppc_grab_regsfpdia();
     ppc_effective_address = int32_t(int16_t(ppc_cur_instruction));
     ppc_effective_address += (reg_a) ? val_reg_a : 0;
-    float result = (float)mmu_read_vmem<uint32_t>(ppc_effective_address);
-    ppc_state.fpr[reg_d].dbl64_r = (double)result;
+    uint32_t result = mmu_read_vmem<uint32_t>(ppc_effective_address);
+    ppc_state.fpr[reg_d].dbl64_r = *(float*)(&result);
 }
 
-
 void dppc_interpreter::ppc_lfsu() {
     ppc_grab_regsfpdia();
     if (reg_a) {
         ppc_effective_address = int32_t(int16_t(ppc_cur_instruction));
         ppc_effective_address += (reg_a) ? val_reg_a : 0;
-        float result = (float)mmu_read_vmem<uint32_t>(ppc_effective_address);
-        ppc_state.fpr[reg_d].dbl64_r = (double)result;
+        uint32_t result = mmu_read_vmem<uint32_t>(ppc_effective_address);
+        ppc_state.fpr[reg_d].dbl64_r = *(float*)(&result);
         ppc_state.gpr[reg_a] = ppc_effective_address;
     } else {
         ppc_exception_handler(Except_Type::EXC_PROGRAM, Exc_Cause::ILLEGAL_OP);
@@ -702,16 +701,16 @@ void dppc_interpreter::ppc_lfsu() {
 void dppc_interpreter::ppc_lfsx() {
     ppc_grab_regsfpdiab();
     ppc_effective_address = (reg_a) ? val_reg_a + val_reg_b : val_reg_b;
-    float result = (float)mmu_read_vmem<uint32_t>(ppc_effective_address);
-    ppc_state.fpr[reg_d].dbl64_r = (double)result;
+    uint32_t result = mmu_read_vmem<uint32_t>(ppc_effective_address);
+    ppc_state.fpr[reg_d].dbl64_r = *(float*)(&result);
 }
 
 void dppc_interpreter::ppc_lfsux() {
     ppc_grab_regsfpdiab();
     if (reg_a) {
         ppc_effective_address = val_reg_a + val_reg_b;
-        float result = (float)mmu_read_vmem<uint32_t>(ppc_effective_address);
-        ppc_state.fpr[reg_d].dbl64_r = (double)result;
+        uint32_t result = mmu_read_vmem<uint32_t>(ppc_effective_address);
+        ppc_state.fpr[reg_d].dbl64_r = *(float*)(&result);
         ppc_state.gpr[reg_a] = ppc_effective_address;
     } else {
         ppc_exception_handler(Except_Type::EXC_PROGRAM, Exc_Cause::ILLEGAL_OP);