Restore fast copies using the fxlibc memcpy()

README

@@ -2,13 +2,12 @@ This repository is a fork of CGDOOM which was ported originally by MPoupe.
 
 Credit goes to:
 * MPoupe for the original fx-CG 10/20 port of DOOM.
-* ProgrammerNerd for attempts at an fx-CG 50 port, which this repository is
+* ComputerNerd for attempts at an fx-CG 50 port, which this repository is
   based on.
 * Lephenixnoir for the final fixes and fx-CG 50 version.
 
 TODO:
 -> Reenable LTO if possible
--> Include a proper fast, version of memcpy
 -> Try and use more memory regions in z_zone.c
 -> Overclocking etc.
 -> Improve file mapping speed (DMA)
@@ -26,5 +25,6 @@ The differences are (I might push it later):
 * Linker script outputs in elf32-sh format
 * Linker script sets 500k of RAM instead of 64k
 * LTO disabled (hopefully it could be reenabled later)
+* Syscall memcpy() (apparently broken) replaced by fxlibc memcpy()
 
 [1] https://github.com/Jonimoose/libfxcg/

cgdoom/cgdoom.c

@@ -459,10 +459,7 @@ int Flash_ReadFile(void *buf, int size, int readpos)
 			I_ErrorI ("Flash_ReadFile", size, readpos, 0, i);
 			return i;
 		}
-		for(int n = 0; n < i; n++) {
-			((char *)buf)[n] = ((char *)pSrc)[n];
-		}
-//		memcpy(buf,pSrc,i);
+		memcpy(buf,pSrc,i);
 		buf = ((char*)buf)+i;
 		readpos +=i;
 		size -=i;

cgdoom/v_video.c

@@ -171,8 +171,7 @@ void V_CopyRect(int srcx,int srcy,int srcscrn,int width,int height,int destx,int
   dest = screens[destscrn]+SCREENWIDTH*desty+destx; 
   for ( ; height>0 ; height--) 
   { 
-    for(int n = 0; n < width; n++) dest[n] = src[n];
-//    memcpy (dest, src, width);
+    memcpy (dest, src, width);
     src += SCREENWIDTH; 
     dest += SCREENWIDTH; 
   }