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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/sh/lib64/memset.S
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/* Cloned and hacked for uClibc by Paul Mundt, December 2003 */

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/* Modified by SuperH, Inc. September 2003 */

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!

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! Fast SH memset

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!

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! by Toshiyasu Morita (tm@netcom.com)

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!

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! SH5 code by J"orn Rennecke ([email protected])

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! Copyright 2002 SuperH Ltd.

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!

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#if __BYTE_ORDER == __LITTLE_ENDIAN

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#define SHHI shlld

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#define SHLO shlrd

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#else

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#define SHHI shlrd

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#define SHLO shlld

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#endif

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	.section .text..SHmedia32,"ax"

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	.globl	memset

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	.type	memset, @function

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	.align 5

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memset:

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	pta/l multiquad, tr0

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	andi r2, 7, r22

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	ptabs r18, tr2

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	mshflo.b r3,r3,r3

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	add r4, r22, r23

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	mperm.w r3, r63, r3	// Fill pattern now in every byte of r3

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	movi 8, r9

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	bgtu/u r23, r9, tr0 // multiquad

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	beqi/u r4, 0, tr2       // Return with size 0 - ensures no mem accesses

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	ldlo.q r2, 0, r7

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	shlli r4, 2, r4

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	movi -1, r8

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	SHHI r8, r4, r8

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	SHHI r8, r4, r8

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	mcmv r7, r8, r3

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	stlo.q r2, 0, r3

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	blink tr2, r63

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multiquad:

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	pta/l lastquad, tr0

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	stlo.q r2, 0, r3

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	shlri r23, 3, r24

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	add r2, r4, r5

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	beqi/u r24, 1, tr0 // lastquad

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	pta/l loop, tr1

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	sub r2, r22, r25

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	andi r5, -8, r20   // calculate end address and

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	addi r20, -7*8, r8 // loop end address; This might overflow, so we need

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	                   // to use a different test before we start the loop

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	bge/u r24, r9, tr1 // loop

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	st.q r25, 8, r3

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	st.q r20, -8, r3

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	shlri r24, 1, r24

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	beqi/u r24, 1, tr0 // lastquad

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	st.q r25, 16, r3

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	st.q r20, -16, r3

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	beqi/u r24, 2, tr0 // lastquad

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	st.q r25, 24, r3

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	st.q r20, -24, r3

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lastquad:

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	sthi.q r5, -1, r3

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	blink tr2,r63

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loop:

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!!!	alloco r25, 32	// QQQ comment out for short-term fix to SHUK #3895.

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			// QQQ commenting out is locically correct, but sub-optimal

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			// QQQ Sean McGoogan - 4th April 2003.

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	st.q r25, 8, r3

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	st.q r25, 16, r3

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	st.q r25, 24, r3

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	st.q r25, 32, r3

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	addi r25, 32, r25

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	bgeu/l r8, r25, tr1 // loop

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	st.q r20, -40, r3

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	st.q r20, -32, r3

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	st.q r20, -24, r3

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	st.q r20, -16, r3

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	st.q r20, -8, r3

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	sthi.q r5, -1, r3

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	blink tr2,r63

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	.size	memset,.-memset

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