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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [machine/] [sh/] [strcmp.S] - Blame information for rev 207

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Line No. Rev Author Line
1 207 jeremybenn
! SH5 code Copyright 2002 SuperH Ltd.
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#include "asm.h"
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ENTRY(strcmp)
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#if __SHMEDIA__
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        ld.ub   r2,0,r4
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        pt/l    quickret0,tr0
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        ld.ub   r3,0,r5
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        ptabs   r18,tr2
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        beqi/u  r4,0,tr0
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        ld.ub   r2,1,r6
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        bne/u   r4,r5,tr0
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        pt/l    quickret1,tr1
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        ld.ub   r3,1,r7
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        beqi/u  r6,0,tr1
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        ld.ub   r2,2,r4
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        bne/u   r6,r7,tr1
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        ld.ub   r3,2,r5
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        beqi/u  r4,0,tr0
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        ld.ub   r2,3,r6
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        bne/u   r4,r5,tr0
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        ld.ub   r3,3,r7
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        beqi/u  r6,0,tr1
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        ld.ub   r2,4,r4
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        bne/u   r6,r7,tr1
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        ld.ub   r3,4,r5
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        beqi/u  r4,0,tr0
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        ld.ub   r2,5,r6
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        bne/u   r4,r5,tr0
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        ld.ub   r3,5,r7
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        beqi/u  r6,0,tr1
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        ld.ub   r2,6,r4
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        bne/u   r6,r7,tr1
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        ld.ub   r3,6,r5
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        beqi/u  r4,0,tr0
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        ld.ub   r2,7,r6
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        bne/u   r4,r5,tr0
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        ld.ub   r3,7,r7
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        beqi/u  r6,0,tr1
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        sub     r3,r2,r3
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        bne/u   r6,r7,tr1
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        andi    r2,-8,r2
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        add     r3,r2,r3
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        ldlo.q  r3,8,r23
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        pt      r23_zero,tr0
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        shlli   r3,3,r22
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        sub     r63,r22,r20
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        movi    0x101,r6
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        mperm.w r6,r63,r6
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        SHLO    r6,r22,r7
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        msubs.ub r7,r23,r8
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        pt      loop,tr1
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        bnei/u  r8,0,tr0 // r23_zero
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        pt      found_zero,tr0
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        addi    r3,15,r3
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        andi    r3,-8,r3
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        sub     r3,r2,r3
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        bne/l   r7,r6,tr1 // loop
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        /* The strings are aligned to each other.  */
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        /* It is possible to have a loop with six cycles / iteration
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           by re-ordering the exit conditions, but then it needs extra
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           time and/or code to sort out the r4 != r5 case.  */
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        pt      al_loop,tr1
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        pt      al_found_zero,tr0
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al_loop:
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        ld.q    r2,8,r4
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        ldx.q   r2,r3,r5
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        addi    r2,8,r2
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        mcmpeq.b r63,r4,r8
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        pt      cmp_quad,tr3
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        bnei/u  r8,0,tr0  // al_found_zero
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        beq/l   r4,r5,tr1 // al_loop
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        blink   tr3,r63   // cmp_quad
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        .balign 8
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quickret0:
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        sub     r4,r5,r2
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        blink   tr2,r63
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quickret1:
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        sub     r6,r7,r2
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        blink   tr2,r63
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loop:
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        ld.q    r2,8,r4
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        ldx.q   r2,r3,r19
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        addi    r2,8,r2
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        msubs.ub r6,r4,r8
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        mcmpeq.b r63,r19,r9
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        SHHI    r19,r20,r21
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        or      r21,r23,r5
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        SHLO    r19,r22,r23
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        bne/u   r8,r9,tr0 // found_zero
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        beq/l   r4,r5,tr1 // loop
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cmp_quad:
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#ifdef __LITTLE_ENDIAN__
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        byterev r4,r4
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        byterev r5,r5
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#endif
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        cmpgtu  r4,r5,r6
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        cmpgtu  r5,r4,r7
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        sub     r6,r7,r2
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        blink tr2,r63
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found_zero:
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        pt      zero_now,tr0
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        pt      cmp_quad,tr1
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        SHHI    r9,r20,r7
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        bne/u   r8,r7,tr0 // zero_now
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        bne/u   r4,r5,tr1 // cmp_quad
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        SHLO    r9,r22,r8
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r23_zero:
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        ld.q    r2,8,r4
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        add     r23,r63,r5
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zero_now:
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al_found_zero:
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/* We konw that one of the values has at lest one zero, and r8 holds
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   an 0x01 or 0xff mask for every zero found in one of the operands.
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   If both operands have the first zero in the same place, this mask
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   allows us to truncate the comparison to the valid bytes in the
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   strings.  If the first zero is in different places, it doesn't
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   matter if some invalid bytes are included, since the comparison
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   of the zero with the non-zero will determine the outcome.  */
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#ifdef __LITTLE_ENDIAN__
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        shlli   r8,8,r8
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        addi    r8,-1,r9
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        andc    r9,r8,r8
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        and     r8,r4,r4
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        and     r8,r5,r5
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#else
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        shlri r8,1,r8
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        nsb     r8,r8
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        addi    r8,8,r8
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        andi    r8,56,r8
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        sub     r63,r8,r8
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        shlrd   r4,r8,r4
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        shlrd   r5,r8,r5
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#endif
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#ifdef __LITTLE_ENDIAN__
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        byterev r4,r4
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        byterev r5,r5
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#endif
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        cmpgtu  r4,r5,r6
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        cmpgtu  r5,r4,r7
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        sub     r6,r7,r2
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        blink tr2,r63
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#else /* ! __SHMEDIA__, i.e. SH 1..4 / SHcompact */
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#ifdef __SH5__
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#define STR1 r2
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#define STR2 r3
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#define RESULT r2
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#define TMP r4
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#else
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! Entry: r4: string1
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!        r5: string2
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! Exit:  r0: result
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!        r1-r2,r4-r5: clobbered
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#define STR1 r4
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#define STR2 r5
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#define RESULT r0
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#define TMP r2
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#endif /* __SH5__ */
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        mov     STR1,r0
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        or      STR2,r0
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        tst     #3,r0
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        bf      L_setup_char_loop
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        mov     #0,r0
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#ifdef DELAYED_BRANCHES
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        mov.l   @STR1+,r1
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        .align  2
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Longword_loop:
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        mov.l   @STR2+,TMP
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        cmp/str r0,r1
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        bt      Longword_loop_end
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        cmp/eq  r1,TMP
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        bt.s    Longword_loop
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        mov.l   @STR1+,r1
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        add #-4, STR1
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Longword_loop_end:
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        add #-4, STR1
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        add #-4, STR2
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L_setup_char_loop:
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        mov.b   @STR1+,r0
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        .align  2
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L_char_loop:
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        mov.b   @STR2+,r1
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        tst     r0,r0
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        bt      L_return
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        cmp/eq  r0,r1
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        bt.s L_char_loop
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        mov.b   @STR1+,r0
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        add     #-2,STR1
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        mov.b   @STR1,r0
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#else /* ! DELAYED_BRANCHES */
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        .align  2
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Longword_loop:
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        mov.l   @r4+,r1
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        mov.l   @r5+,r2
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        cmp/str r0,r1
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        bt      Longword_loop_end
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        cmp/eq  r1,r2
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        bt      Longword_loop
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Longword_loop_end:
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        add #-4, r4
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        add #-4, r5
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        .align  2
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L_setup_char_loop:
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L_char_loop:
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        mov.b   @r4+,r0
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        mov.b   @r5+,r1
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        tst     r0,r0
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        bt      L_return
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        cmp/eq  r0,r1
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        bt L_char_loop
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#endif
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L_return:
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        extu.b  r0,RESULT
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        extu.b  r1,r1
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        rts
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        sub     r1,RESULT
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#endif /* ! __SHMEDIA__ */

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