91 lines
1.9 KiB
ArmAsm
91 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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!
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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 (joern.rennecke@superh.com)
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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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