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https://github.com/autc04/Retro68.git
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181 lines
3.7 KiB
ArmAsm
181 lines
3.7 KiB
ArmAsm
/* Copyright (C) 2008-2016 Free Software Foundation, Inc.
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Contributor: Joern Rennecke <joern.rennecke@embecosm.com>
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on behalf of Synopsys Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* XMAC schedule: directly back-to-back multiplies stall; the third
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instruction after a multiply stalls unless it is also a multiply. */
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#include "arc-ieee-754.h"
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#if 0 /* DEBUG */
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.global __mulsf3
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FUNC(__mulsf3)
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.balign 4
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__mulsf3:
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push_s blink
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push_s r1
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bl.d __mulsf3_c
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push_s r0
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ld_s r1,[sp,4]
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st_s r0,[sp,4]
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bl.d __mulsf3_asm
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pop_s r0
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pop_s r1
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pop_s blink
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cmp r0,r1
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jeq_s [blink]
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and r12,r0,r1
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bic.f 0,0x7f800000,r12
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bne 0f
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bmsk.f 0,r0,22
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bmsk.ne.f r1,r1,22
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jne_s [blink] ; both NaN -> OK
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0: bl abort
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ENDFUNC(__mulsf3)
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#define __mulsf3 __mulsf3_asm
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#endif /* DEBUG */
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.balign 4
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.global __mulsf3
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FUNC(__mulsf3)
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__mulsf3:
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ld.as r9,[pcl,79]; [pcl,((.L7f800000-.+2)/4)]
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bmsk r4,r1,22
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bset r2,r0,23
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asl_s r2,r2,8
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bset r3,r4,23
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MPYHU r6,r2,r3
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and r11,r0,r9
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breq r11,0,.Ldenorm_dbl0
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mpyu r7,r2,r3
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breq r11,r9,.Linf_nan_dbl0
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and r12,r1,r9
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asl.f 0,r6,8
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breq r12,0,.Ldenorm_dbl1
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.Lpast_denorm:
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xor_s r0,r0,r1
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.Lpast_denorm_dbl1:
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add.pl r6,r6,r6
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bclr.pl r6,r6,23
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add.pl.f r7,r7,r7
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ld.as r4,[pcl,64]; [pcl,((.L7fffffff-.+2)/4)]
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add.cs r6,r6,1
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lsr.f 0,r6,1
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breq r12,r9,.Linf_nan_dbl1
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add_s r12,r12,r11
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adc.f 0,r7,r4
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add_s r12,r12, \
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-0x3f800000
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adc.f r8,r6,r12
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bic r0,r0,r4
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tst.pl r8,r9
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min r3,r8,r9
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jpnz.d [blink]
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add.pnz r0,r0,r3
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; infinity or denormal number
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add.ne.f r3,r3,r3
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bpnz .Linfinity
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asr_s r3,r3,23+1
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bset r6,r6,23
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sub_s r3,r3,1
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neg_s r2,r3
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brhi r2,24,.Lret_r0 ; right shift shift > 24 -> return +-0
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lsr r2,r6,r2
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asl r9,r6,r3
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lsr.f 0,r2,1
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tst r7,r7
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add_s r0,r0,r2
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bset.ne r9,r9,0
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adc.f 0,r9,r4
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j_s.d [blink]
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add.cs r0,r0,1
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.Linfinity:
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j_s.d [blink]
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add_s r0,r0,r9
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.Lret_r0: j_s [blink]
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.balign 4
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.Linf_nan_dbl0:
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sub_s r2,r1,1 ; inf/nan * 0 -> nan; inf * nan -> nan (use |r2| >= inf)
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bic.f 0,r9,r2
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xor_s r0,r0,r1
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bclr_s r1,r1,31
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xor_s r0,r0,r1
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jne_s [blink]
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.Lretnan:
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j_s.d [blink]
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mov r0,-1
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.Ldenorm_dbl0_inf_nan_dbl1:
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bmsk.f 0,r0,30
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beq_s .Lretnan
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xor_s r0,r0,r1
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.Linf_nan_dbl1:
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xor_s r1,r1,r0
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bclr_s r1,r1,31
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j_s.d [blink]
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xor_s r0,r0,r1
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.balign 4
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.Ldenorm_dbl0:
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bclr_s r2,r2,31
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norm.f r4,r2
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and r12,r1,r9
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add_s r2,r2,r2
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asl r2,r2,r4
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asl r4,r4,23
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MPYHU r6,r2,r3
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breq r12,r9,.Ldenorm_dbl0_inf_nan_dbl1
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sub.ne.f r12,r12,r4
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mpyu r7,r2,r3
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bhi.d .Lpast_denorm
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asl.f 0,r6,8
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xor_s r0,r0,r1
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bmsk r1,r0,30
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j_s.d [blink]
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bic_l r0,r0,r1
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.balign 4
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.Ldenorm_dbl1:
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norm.f r3,r4
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xor_s r0,r0,r1
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sub_s r3,r3,7
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asl r4,r4,r3
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sub_s r3,r3,1
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asl_s r3,r3,23
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MPYHU r6,r2,r4
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sub.ne.f r11,r11,r3
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bmsk r8,r0,30
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mpyu r7,r2,r4
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bhi.d .Lpast_denorm_dbl1
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asl.f 0,r6,8
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j_s.d [blink]
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bic r0,r0,r8
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.balign 4
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.L7f800000:
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.long 0x7f800000
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.L7fffffff:
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.long 0x7fffffff
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ENDFUNC(__mulsf3)
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