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4466b20cfc
Adopted from the uClibc optimized string versions. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
98 lines
1.9 KiB
ArmAsm
98 lines
1.9 KiB
ArmAsm
/* Cloned and hacked for uClibc by Paul Mundt, December 2003 */
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/* Modified by SuperH, Inc. September 2003 */
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! Entry: arg0: destination
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! arg1: source
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! Exit: result: destination
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!
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! SH5 code Copyright 2002 SuperH Ltd.
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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 strcpy
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.type strcpy, @function
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.align 5
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strcpy:
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pta/l shortstring,tr1
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ldlo.q r3,0,r4
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ptabs r18,tr4
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shlli r3,3,r7
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addi r2, 8, r0
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mcmpeq.b r4,r63,r6
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SHHI r6,r7,r6
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bnei/u r6,0,tr1 // shortstring
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pta/l no_lddst, tr2
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ori r3,-8,r23
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sub r2, r23, r0
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sub r3, r2, r21
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addi r21, 8, r20
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ldx.q r0, r21, r5
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pta/l loop, tr0
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ori r2,-8,r22
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mcmpeq.b r5, r63, r6
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bgt/u r22, r23, tr2 // no_lddst
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// r22 < r23 : Need to do a load from the destination.
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// r22 == r23 : Doesn't actually need to load from destination,
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// but still can be handled here.
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ldlo.q r2, 0, r9
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movi -1, r8
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SHLO r8, r7, r8
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mcmv r4, r8, r9
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stlo.q r2, 0, r9
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beqi/l r6, 0, tr0 // loop
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add r5, r63, r4
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addi r0, 8, r0
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blink tr1, r63 // shortstring
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no_lddst:
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// r22 > r23: note that for r22 == r23 the sthi.q would clobber
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// bytes before the destination region.
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stlo.q r2, 0, r4
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SHHI r4, r7, r4
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sthi.q r0, -1, r4
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beqi/l r6, 0, tr0 // loop
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add r5, r63, r4
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addi r0, 8, r0
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shortstring:
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#if __BYTE_ORDER != __LITTLE_ENDIAN
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pta/l shortstring2,tr1
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byterev r4,r4
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#endif
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shortstring2:
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st.b r0,-8,r4
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andi r4,0xff,r5
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shlri r4,8,r4
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addi r0,1,r0
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bnei/l r5,0,tr1
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blink tr4,r63 // return
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.balign 8
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loop:
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stlo.q r0, 0, r5
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ldx.q r0, r20, r4
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addi r0, 16, r0
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sthi.q r0, -9, r5
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mcmpeq.b r4, r63, r6
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bnei/u r6, 0, tr1 // shortstring
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ldx.q r0, r21, r5
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stlo.q r0, -8, r4
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sthi.q r0, -1, r4
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mcmpeq.b r5, r63, r6
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beqi/l r6, 0, tr0 // loop
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add r5, r63, r4
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addi r0, 8, r0
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blink tr1, r63 // shortstring
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.size strcpy,.-strcpy
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