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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [config/] [sh/] [lib1funcs-Os-4-200.asm] - Blame information for rev 827

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1 38 julius 
/* Copyright (C) 2006 Free Software Foundation, Inc.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file.  (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING.  If not, write to
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the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.  */
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/* Moderately Space-optimized libgcc routines for the Renesas SH /
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   STMicroelectronics ST40 CPUs.
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   Contributed by J"orn Rennecke joern.rennecke@st.com.  */
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#include "lib1funcs.h"
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#if !__SHMEDIA__
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#ifdef L_udivsi3_i4i
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/* 88 bytes; sh4-200 cycle counts:
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   divisor  >= 2G: 11 cycles
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   dividend <  2G: 48 cycles
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   dividend >= 2G: divisor != 1: 54 cycles
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   dividend >= 2G, divisor == 1: 22 cycles */
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#if defined (__SH_FPU_DOUBLE__) || defined (__SH4_SINGLE_ONLY__)
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!! args in r4 and r5, result in r0, clobber r1
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        .global GLOBAL(udivsi3_i4i)
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        FUNC(GLOBAL(udivsi3_i4i))
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GLOBAL(udivsi3_i4i):
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        mova L1,r0
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        cmp/pz r5
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        sts fpscr,r1
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        lds.l @r0+,fpscr
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        sts.l fpul,@-r15
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        bf LOCAL(huge_divisor)
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        mov.l r1,@-r15
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        lds r4,fpul
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        cmp/pz r4
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#ifdef FMOVD_WORKS
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        fmov.d dr0,@-r15
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        float fpul,dr0
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        fmov.d dr2,@-r15
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        bt LOCAL(dividend_adjusted)
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        mov #1,r1
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        fmov.d @r0,dr2
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        cmp/eq r1,r5
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        bt LOCAL(div_by_1)
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        fadd dr2,dr0
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LOCAL(dividend_adjusted):
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        lds r5,fpul
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        float fpul,dr2
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        fdiv dr2,dr0
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LOCAL(div_by_1):
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        fmov.d @r15+,dr2
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        ftrc dr0,fpul
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        fmov.d @r15+,dr0
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#else /* !FMOVD_WORKS */
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        fmov.s DR01,@-r15
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        mov #1,r1
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        fmov.s DR00,@-r15
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        float fpul,dr0
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        fmov.s DR21,@-r15
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        bt/s LOCAL(dividend_adjusted)
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        fmov.s DR20,@-r15
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        cmp/eq r1,r5
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        bt LOCAL(div_by_1)
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        fmov.s @r0+,DR20
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        fmov.s @r0,DR21
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        fadd dr2,dr0
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LOCAL(dividend_adjusted):
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        lds r5,fpul
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        float fpul,dr2
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        fdiv dr2,dr0
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LOCAL(div_by_1):
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        fmov.s @r15+,DR20
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        fmov.s @r15+,DR21
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        ftrc dr0,fpul
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        fmov.s @r15+,DR00
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        fmov.s @r15+,DR01
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#endif /* !FMOVD_WORKS */
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        lds.l @r15+,fpscr
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        sts fpul,r0
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        rts
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        lds.l @r15+,fpul
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#ifdef FMOVD_WORKS
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        .p2align 3        ! make double below 8 byte aligned.
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#endif
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LOCAL(huge_divisor):
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        lds r1,fpscr
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        add #4,r15
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        cmp/hs r5,r4
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        rts
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        movt r0
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        .p2align 2
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L1:
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#ifndef FMOVD_WORKS
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        .long 0x80000
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#else
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        .long 0x180000
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#endif
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        .double 4294967296
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        ENDFUNC(GLOBAL(udivsi3_i4i))
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#elif !defined (__sh1__)  /* !__SH_FPU_DOUBLE__ */
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#if 0
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/* With 36 bytes, the following would probably be the most compact
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   implementation, but with 139 cycles on an sh4-200, it is extremely slow.  */
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GLOBAL(udivsi3_i4i):
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        mov.l r2,@-r15
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        mov #0,r1
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        div0u
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        mov r1,r2
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        mov.l r3,@-r15
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        mov r1,r3
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        sett
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        mov r4,r0
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LOCAL(loop):
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        rotcr r2
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        ;
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        bt/s LOCAL(end)
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        cmp/gt r2,r3
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        rotcl r0
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        bra LOCAL(loop)
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        div1 r5,r1
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LOCAL(end):
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        rotcl r0
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        mov.l @r15+,r3
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        rts
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        mov.l @r15+,r2
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#endif /* 0 */
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/* Size: 186 bytes jointly for udivsi3_i4i and sdivsi3_i4i
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   sh4-200 run times:
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   udiv small divisor: 55 cycles
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   udiv large divisor: 52 cycles
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   sdiv small divisor, positive result: 59 cycles
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   sdiv large divisor, positive result: 56 cycles
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   sdiv small divisor, negative result: 65 cycles (*)
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   sdiv large divisor, negative result: 62 cycles (*)
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   (*): r2 is restored in the rts delay slot and has a lingering latency
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        of two more cycles.  */
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        .balign 4
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        .global GLOBAL(udivsi3_i4i)
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        FUNC(GLOBAL(udivsi3_i4i))
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        FUNC(GLOBAL(sdivsi3_i4i))
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GLOBAL(udivsi3_i4i):
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        sts pr,r1
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        mov.l r4,@-r15
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        extu.w r5,r0
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        cmp/eq r5,r0
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        swap.w r4,r0
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        shlr16 r4
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        bf/s LOCAL(large_divisor)
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        div0u
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        mov.l r5,@-r15
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        shll16 r5
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LOCAL(sdiv_small_divisor):
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        div1 r5,r4
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        bsr LOCAL(div6)
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        div1 r5,r4
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        div1 r5,r4
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        bsr LOCAL(div6)
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        div1 r5,r4
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        xtrct r4,r0
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        xtrct r0,r4
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        bsr LOCAL(div7)
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        swap.w r4,r4
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        div1 r5,r4
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        bsr LOCAL(div7)
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        div1 r5,r4
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        xtrct r4,r0
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        mov.l @r15+,r5
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        swap.w r0,r0
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        mov.l @r15+,r4
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        jmp @r1
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        rotcl r0
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LOCAL(div7):
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        div1 r5,r4
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LOCAL(div6):
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                    div1 r5,r4; div1 r5,r4; div1 r5,r4
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        div1 r5,r4; div1 r5,r4; rts;        div1 r5,r4
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LOCAL(divx3):
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        rotcl r0
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        div1 r5,r4
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        rotcl r0
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        div1 r5,r4
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        rotcl r0
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        rts
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        div1 r5,r4
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LOCAL(large_divisor):
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        mov.l r5,@-r15
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LOCAL(sdiv_large_divisor):
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        xor r4,r0
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        .rept 4
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        rotcl r0
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        bsr LOCAL(divx3)
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        div1 r5,r4
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        .endr
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        mov.l @r15+,r5
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        mov.l @r15+,r4
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        jmp @r1
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        rotcl r0
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        ENDFUNC(GLOBAL(udivsi3_i4i))
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        .global GLOBAL(sdivsi3_i4i)
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GLOBAL(sdivsi3_i4i):
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        mov.l r4,@-r15
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        cmp/pz r5
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        mov.l r5,@-r15
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        bt/s LOCAL(pos_divisor)
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        cmp/pz r4
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        neg r5,r5
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        extu.w r5,r0
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        bt/s LOCAL(neg_result)
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        cmp/eq r5,r0
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        neg r4,r4
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LOCAL(pos_result):
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        swap.w r4,r0
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        bra LOCAL(sdiv_check_divisor)
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        sts pr,r1
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LOCAL(pos_divisor):
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        extu.w r5,r0
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        bt/s LOCAL(pos_result)
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        cmp/eq r5,r0
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        neg r4,r4
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LOCAL(neg_result):
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        mova LOCAL(negate_result),r0
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        ;
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        mov r0,r1
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        swap.w r4,r0
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        lds r2,macl
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        sts pr,r2
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LOCAL(sdiv_check_divisor):
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        shlr16 r4
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        bf/s LOCAL(sdiv_large_divisor)
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        div0u
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        bra LOCAL(sdiv_small_divisor)
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        shll16 r5
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        .balign 4
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LOCAL(negate_result):
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        neg r0,r0
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        jmp @r2
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        sts macl,r2
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        ENDFUNC(GLOBAL(sdivsi3_i4i))
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#endif /* !__SH_FPU_DOUBLE__ */
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#endif /* L_udivsi3_i4i */
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#ifdef L_sdivsi3_i4i
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#if defined (__SH_FPU_DOUBLE__) || defined (__SH4_SINGLE_ONLY__)
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/* 48 bytes, 45 cycles on sh4-200  */
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!! args in r4 and r5, result in r0, clobber r1
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        .global GLOBAL(sdivsi3_i4i)
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        FUNC(GLOBAL(sdivsi3_i4i))
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GLOBAL(sdivsi3_i4i):
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        sts.l fpscr,@-r15
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        sts fpul,r1
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        mova L1,r0
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        lds.l @r0+,fpscr
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        lds r4,fpul
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#ifdef FMOVD_WORKS
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        fmov.d dr0,@-r15
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        float fpul,dr0
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        lds r5,fpul
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        fmov.d dr2,@-r15
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#else
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        fmov.s DR01,@-r15
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        fmov.s DR00,@-r15
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        float fpul,dr0
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        lds r5,fpul
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        fmov.s DR21,@-r15
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        fmov.s DR20,@-r15
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#endif
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        float fpul,dr2
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        fdiv dr2,dr0
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#ifdef FMOVD_WORKS
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        fmov.d @r15+,dr2
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#else
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        fmov.s @r15+,DR20
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        fmov.s @r15+,DR21
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#endif
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        ftrc dr0,fpul
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#ifdef FMOVD_WORKS
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        fmov.d @r15+,dr0
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#else
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        fmov.s @r15+,DR00
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        fmov.s @r15+,DR01
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#endif
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        lds.l @r15+,fpscr
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        sts fpul,r0
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        rts
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        lds r1,fpul
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        .p2align 2
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L1:
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#ifndef FMOVD_WORKS
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        .long 0x80000
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#else
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        .long 0x180000
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#endif
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        ENDFUNC(GLOBAL(sdivsi3_i4i))
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#endif /* __SH_FPU_DOUBLE__ */
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#endif /* L_sdivsi3_i4i */
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#endif /* !__SHMEDIA__ */

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