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[/] [or1k_old/] [trunk/] [linux/] [uClibc/] [libc/] [string/] [sh64/] [memset.S] - Blame information for rev 1782

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Line No. Rev Author Line
1 1325 phoenix 
/* 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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#ifdef __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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