From 26d62ef100d60e41bfc001888d789097da77a20f Mon Sep 17 00:00:00 2001
From: Alcaro
Date: Sun, 7 Dec 2014 20:44:57 +0100
Subject: Properly fix that aggressive loop opt bug.

That kind of overflow is undefined behaviour no matter what you do with it.---
 source/apu_blargg.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

(limited to 'source/apu_blargg.c')

diff --git a/source/apu_blargg.c b/source/apu_blargg.c
index 0a1c334..e06f2b6 100644
--- a/source/apu_blargg.c
+++ b/source/apu_blargg.c
@@ -1566,7 +1566,7 @@ static void spc_cpu_write_smp_reg_( int data, int time, int addr )
 
 static int const bits_in_int = CHAR_BIT * sizeof (int);
 
-static void spc_cpu_write( int data, int addr, int time )
+static void spc_cpu_write( int data, uint16_t addr, int time )
 {
    int reg;
    /* RAM */
@@ -1601,17 +1601,9 @@ static void spc_cpu_write( int data, int addr, int time )
          reg -= ROM_ADDR - 0xF0;
          if ( reg >= 0 ) /* 1% in IPL ROM area or address wrapped around */
          {
-            if ( reg < ROM_SIZE )
-            {
-               m.hi_ram [reg] = (uint8_t) data;
-               if ( m.rom_enabled )
-                  m.ram.ram[reg + ROM_ADDR] = m.rom [reg]; /* restore overwritten ROM */
-            }
-            else
-            {
-               *(&(m.ram.ram[0]) + reg + ROM_ADDR) = CPU_PAD_FILL; /* restore overwritten padding */
-               spc_cpu_write( data, addr & 0xFFFF, time );
-            }
+            m.hi_ram [reg] = (uint8_t) data;
+            if ( m.rom_enabled )
+              m.ram.ram[reg + ROM_ADDR] = m.rom [reg]; /* restore overwritten ROM */
          }
       }
    }
@@ -1619,7 +1611,7 @@ static void spc_cpu_write( int data, int addr, int time )
 
 /* CPU read */
 
-static int spc_cpu_read( int addr, int time )
+static int spc_cpu_read( uint16_t addr, int time )
 {
    int result, reg;
 
@@ -1644,7 +1636,7 @@ static int spc_cpu_read( int addr, int time )
             t->counter = 0;
          }
          /* Other registers */
-         else if ( reg < 0 ) /* 10% */
+         else /* 10% */
          {
             int reg_tmp;
 
@@ -1663,8 +1655,6 @@ static int spc_cpu_read( int addr, int time )
                }
             }
          }
-         else /* 1% */
-            result = spc_cpu_read( reg + (R_T0OUT + 0xF0 - 0x10000), time );
       }
    }
 
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