Add support for Intel's XScale processor

1 files changed, 109 insertions, 0 deletions

diff --git a/newlib/libc/machine/xscale/memcmp.c b/newlib/libc/machine/xscale/memcmp.c
new file mode 100644
index 000000000..193f205db
--- /dev/null
+++ b/newlib/libc/machine/xscale/memcmp.c
@@ -0,0 +1,109 @@
+#if defined __thumb__
+
+#include "../../string/memcmp.c"
+
+#else
+
+#include <string.h>
+#include "xscale.h"
+
+int
+memcmp (const void *s1, const void *s2, size_t len)
+{
+  int result;
+  asm (
+#ifndef __OPTIMIZE_SIZE__ 
+"		
+	cmp	%2, #0x3
+	bls	6f
+	and	r2, %0, #0x3
+	and	r3, %1, #0x3
+	cmp	r2, r3
+	bne	6f
+	mov	lr, %0
+	mov	r4, %1
+	cmp	r2, #0x0
+	beq	3f
+	b	1f
+0:
+	ldrb	r2, [lr], #1	@ zero_extendqisi2
+"	PRELOADSTR("lr") "
+	ldrb	r3, [r4], #1	@ zero_extendqisi2
+"	PRELOADSTR("r4") "
+	cmp	r2, r3
+	bne	5f
+	tst	lr, #0x3
+	beq	3f
+1:
+	sub	%2, %2, #1
+	cmn	%2, #0x1
+	bne	0b
+	b	4f
+
+0:
+	cmp	%2, #0x7
+	bls	3f
+	ldmia	lr,{r2, r3}
+	ldmia	r4,{r5, r6}
+	sub	%2, %2, #0x4
+	cmp	r2, r5
+	bne	1f
+	sub	%2, %2, #0x4
+	add	lr, lr, #0x4
+	add	r4, r4, #0x4
+	cmp	r3, r6
+	beq	0b
+1:
+	add	%2, %2, #0x4
+	sub	%0, lr, #0x4
+	sub	%1, r4, #0x4
+	b	6f
+3:
+	cmp	%2, #0x3
+	bls	1f
+	ldr	r2, [lr], #4
+	ldr	r3, [r4], #4
+	sub	%2, %2, #4
+	cmp	r2, r3
+	bne	1f
+0:
+	cmp	%2, #0x3
+	bls	1f
+	ldr	r2, [lr], #4
+"	PRELOADSTR("lr") "
+	ldr	r3, [r4], #4
+"	PRELOADSTR("r4") "
+	sub	%2, %2, #4
+	cmp	r2, r3
+	beq	0b
+1:
+	sub	%0, lr, #0x4
+	sub	%1, r4, #0x4
+	add	%2, %2, #4
+"
+#endif /* !__OPTIMIZE_SIZE__ */
+"
+6:				
+	sub	%2, %2, #1
+	cmn	%2, #0x1
+	beq	4f
+0:
+	ldrb	r2, [%0], #1	@ zero_extendqisi2
+"	PRELOADSTR("%0") "
+	ldrb	r3, [%1], #1	@ zero_extendqisi2
+"	PRELOADSTR("%1") "
+	cmp	r2, r3
+	bne	5f
+	sub	%2, %2, #1
+	cmn	%2, #0x1
+	bne	0b
+4:		
+	mov	r3, r2
+5:		
+	rsb	%0, r3, r2"
+       : "=r" (result), "=&r" (s2), "=&r" (len)
+       : "0" (s1), "1" (s2), "2" (len)
+       : "r2", "r3", "r4", "r5", "r6", "cc");
+  return result;
+}
+#endif