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[patch] arm optimized SDL_memcpy4

3-ARM_optimized_SDL_memcpy4.patch (text/plain), 2.49 KB, created by Vittorio Giovara on 2013-07-25 16:56:16 UTC

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Creator: Vittorio Giovara

Created: 2013-07-25 16:56:16 UTC

Size: 2.49 KB

patch

obsolete

># HG changeset patch
># User Vittorio Giovara <vittorio.giovara@gmail.com>
># Date 1374316289 -7200
># Node ID f3ea23f06b6e2216f77e6ba03583aa1cea41b767
># Parent  917a34672dfa12c78d43893d7c1ff3b0392ba1d5
>ARM optimized SDL_memcpy4
>
>http://lists.uclibc.org/pipermail/uclibc/2003-September/027817.html
>
>diff -r 917a34672dfa -r f3ea23f06b6e include/SDL_stdinc.h
>--- a/include/SDL_stdinc.h	Sat Jul 20 12:31:11 2013 +0200
>+++ b/include/SDL_stdinc.h	Sat Jul 20 12:31:29 2013 +0200
>@@ -337,7 +337,52 @@
> 
> SDL_FORCE_INLINE void *SDL_memcpy4(void *dst, const void *src, size_t dwords)
> {
>+#if defined(__GNUC__) && defined(__arm__)
>+    register int *r1 = dst;
>+    register const int *r2 = src;
>+    register char n = dwords;
>+
>+    if ( ((int) r1 & 0x3) || ((int) r2 & 0x3) || (n <= 0x38) )
>+        while (n) {
>+            *r1++ = *r2++;
>+            --n;
>+        }
>+    else
>+        __asm__ __volatile__ (
>+"1:                                         \t\n"
>+            "ldmia      %0!,{r3-r9}         \t\n"
>+            "stmia      %1!,{r3-r9}         \t\n"
>+            "ldmia      %0!,{r3-r9}         \t\n"
>+            "stmia      %1!,{r3-r9}         \t\n"
>+            "subs       %2, %2, #0x38       \t\n"
>+            "cmp        %2, #0x38           \t\n"
>+            "bge        1b                  \t\n"
>+"2:                                         \t\n"
>+            "cmp        %2, #4              \t\n"
>+            "blt        3f                  \t\n"
>+            "ldr        r4,[%0]             \t\n"
>+            "str        r4,[%1]             \t\n"
>+            "add        %0, %0, #4          \t\n"
>+            "add        %1, %1, #4          \t\n"
>+            "sub        %2, %2, #4          \t\n"
>+            "b          2b                  \t\n"
>+"3:                                         \t\n"
>+            "cmp        %2, #0              \t\n"
>+            "beq        4f                  \t\n"
>+            "ldrb       r4,[%0]             \t\n"
>+            "strb       r4,[%1]             \t\n"
>+            "add        %0, %0, #1          \t\n"
>+            "add        %1, %1, #1          \t\n"
>+            "sub        %2, %2, #1          \t\n"
>+            "b          3b                  \t\n"
>+"4:                                         \t\n"
>+            :
>+            : "r"(r2),"r"(r1),"r"(n)
>+            : "r3","r4","r5","r6","r7","r8","r9" );
>+    return dst;
>+#else
>     return SDL_memcpy(dst, src, dwords * 4);
>+#endif
> }
> 
> extern DECLSPEC void *SDLCALL SDL_memmove(void *dst, const void *src, size_t len);

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We are currently migrating Bugzilla to GitHub issues.Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.

We are currently migrating Bugzilla to GitHub issues.
Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.
When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.