Import of the watch repository from Pebble

third_party/ARM/string/memset-thumb2.S

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+/*
+ * Copyright (c) 2015 ARM Ltd
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the company may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* modified 2016-06-22:
+ *	converted aeabi_memset to normal memset (save r0, different argument order) */
+
+#if __ARM_ARCH_ISA_THUMB >= 2
+
+	.syntax unified
+	.text
+	.align	2
+	.thumb
+	.thumb_func
+	.global memset
+	.type	memset, %function
+memset:
+	.cfi_startproc
+	push	{r0, r4, r5, r6}
+	lsls	r4, r0, #30
+	beq	.L14
+	subs	r4, r2, #1
+	cmp	r2, #0
+	beq	.L16
+	uxtb	r5, r1
+	mov	r3, r0
+	b	.L4
+.L6:
+	subs	r2, r4, #1
+	cbz	r4, .L16
+	mov	r4, r2
+.L4:
+	strb	r5, [r3], #1
+	lsls	r2, r3, #30
+	bne	.L6
+.L2:
+	cmp	r4, #3
+	bls	.L11
+	uxtb	r5, r1
+	orr	r5, r5, r5, lsl #8
+	cmp	r4, #15
+	orr	r5, r5, r5, lsl #16
+	bls	.L9
+	add	r2, r3, #16
+	mov	r6, r4
+.L10:
+	subs	r6, r6, #16
+	cmp	r6, #15
+	str	r5, [r2, #-16]
+	str	r5, [r2, #-12]
+	str	r5, [r2, #-8]
+	str	r5, [r2, #-4]
+	add	r2, r2, #16
+	bhi	.L10
+	sub	r2, r4, #16
+	bic	r2, r2, #15
+	and	r4, r4, #15
+	adds	r2, r2, #16
+	cmp	r4, #3
+	add	r3, r3, r2
+	bls	.L11
+.L9:
+	mov	r6, r3
+	mov	r2, r4
+.L12:
+	subs	r2, r2, #4
+	cmp	r2, #3
+	str	r5, [r6], #4
+	bhi	.L12
+	subs	r2, r4, #4
+	bic	r2, r2, #3
+	adds	r2, r2, #4
+	add	r3, r3, r2
+	and	r4, r4, #3
+.L11:
+	cbz	r4, .L16
+	uxtb	r1, r1
+	add	r4, r4, r3
+.L13:
+	strb	r1, [r3], #1
+	cmp	r3, r4
+	bne	.L13
+.L16:
+	pop	{r0, r4, r5, r6}
+	bx	lr
+.L14:
+	mov	r4, r2
+	mov	r3, r0
+	b	.L2
+	.cfi_endproc
+	.size memset, . - memset
+
+#endif