From 11ec213c99d5d22905ff82cf3fb26ba6a8adf290 Mon Sep 17 00:00:00 2001
From: David Guillen Fandos
Date: Tue, 23 Mar 2021 19:05:35 +0100
Subject: Make ewram memory lineal

This saves a few cycles in MIPS and simplifies a bit the core.
Removed the write map, only affects interpreter performance very
minimally. Rewired ARM and x86 handlers to support direct access to
I/EWRAM (and VRAM on ARM) to compensate. Overall performance is slightly
better but code is cleaner and allows for further improvements in the
dynarecs.
---
 libretro.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

(limited to 'libretro.c')

diff --git a/libretro.c b/libretro.c
index 334864c..d94ddcb 100644
--- a/libretro.c
+++ b/libretro.c
@@ -809,15 +809,8 @@ static void set_memory_descriptors(void)
 {
    const uint64_t mem = RETRO_MEMORY_SYSTEM_RAM;
    struct retro_memory_descriptor desc[9] = {
-      { mem, iwram, 0x00000 + 0x8000, 0x3000000, 0, 0, 0x8000, NULL },
-      { mem, ewram, 0x00000 + 0x8000, 0x2000000, 0, 0, 0x8000, NULL },
-      { mem, ewram, 0x10000 + 0x8000, 0x2008000, 0, 0, 0x8000, NULL },
-      { mem, ewram, 0x20000 + 0x8000, 0x2010000, 0, 0, 0x8000, NULL },
-      { mem, ewram, 0x30000 + 0x8000, 0x2018000, 0, 0, 0x8000, NULL },
-      { mem, ewram, 0x40000 + 0x8000, 0x2020000, 0, 0, 0x8000, NULL },
-      { mem, ewram, 0x50000 + 0x8000, 0x2028000, 0, 0, 0x8000, NULL },
-      { mem, ewram, 0x60000 + 0x8000, 0x2030000, 0, 0, 0x8000, NULL },
-      { mem, ewram, 0x70000 + 0x8000, 0x2038000, 0, 0, 0x8000, NULL }
+      { mem, iwram, 0x00000 + 0x8000, 0x3000000, 0, 0,  0x8000, NULL },
+      { mem, ewram, 0x00000,          0x2000000, 0, 0, 0x40000, NULL },
    };
    struct retro_memory_map retromap = {
       desc,
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