222 lines
4.7 KiB
ArmAsm
222 lines
4.7 KiB
ArmAsm
/* Copyright (C) 2008-2021 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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#include "arc-ieee-754.h"
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#if 0 /* DEBUG */
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.global __divsf3
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FUNC(__divsf3)
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.balign 4
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__divsf3:
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push_s blink
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push_s r1
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bl.d __divsf3_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 __divsf3_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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#if 1
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bne abort
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jeq_s [blink]
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b abort
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#else
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bne abort
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j_s [blink]
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#endif
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ENDFUNC(__divsf3)
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#define __divsf3 __divsf3_asm
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#endif /* DEBUG */
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.balign 4
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__divdf3_support: /* This label makes debugger output saner. */
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FUNC(__divsf3)
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.Ldenorm_fp0:
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norm.f r12,r2 ; flag for 0/x -> 0 check
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bic.ne.f 0,0x60000000,r1 ; denorm/large number -> 0
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beq_s .Lret0_NaN
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tst r1,r9
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add_s r2,r2,r2
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sub_s r12,r12,8
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asl_s r2,r2,r12
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asl_l r12,r12,23
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bne.d .Lpast_denorm_fp0
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add r5,r5,r12
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/* r0 is subnormal, r1 is subnormal or 0. */
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.balign 4
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.Ldenorm_fp1:
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norm.f r12,r3 ; flag for x/0 -> Inf check
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bic.ne.f 0,0x60000000,r0 ; large number/denorm -> Inf
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beq_s .Linf
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add_s r3,r3,r3
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sub_s r12,r12,8
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asl_s r3,r3,r12
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asl_s r12,r12,23
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b.d .Lpast_denorm_fp1
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add r4,r4,r12
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.Lret0_NaN:
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bclr.f 0,r1,31 ; 0/0 -> NaN
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bic r0,r10,r9
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j_s.d [blink]
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sub.eq r0,r0,1
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.global __divsf3
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.balign 4
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.long 0x7f800000 ; exponent mask
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__divsf3:
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ld r9,[pcl,-4]
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bmsk r2,r0,22
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xor r4,r0,r2
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bmsk r3,r1,22
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xor r5,r1,r3
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and r11,r0,r9
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breq.d r11,0,.Ldenorm_fp0
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xor r10,r4,r5
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breq r11,r9,.Linf_nan_fp0
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bset_s r2,r2,23
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and r11,r1,r9
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breq r11,0,.Ldenorm_fp1
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breq r11,r9,.Linf_nan_fp1
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.Lpast_denorm_fp0:
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bset_s r3,r3,23
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.Lpast_denorm_fp1:
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cmp r2,r3
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asl_s r2,r2,6+1
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asl_s r3,r3,7
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add.lo r2,r2,r2
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bclr r8,r9,30 ; exponent bias
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bclr.lo r8,r8,23 ; reduce exp by one if fraction is shifted
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sub r4,r4,r5
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add r4,r4,r8
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xor.f 0,r10,r4
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bmi .Linf_denorm
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and r12,r4,r9
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breq r12,0,.Ldenorm
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sub_s r2,r2,r3 ; discard implicit 1
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.Ldiv_23bit:
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.rep 6
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divaw r2,r2,r3
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.endr
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breq r12,r9,.Linf
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bmsk r0,r2,6
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xor_s r2,r2,r0
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.Ldiv_17bit:
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.rep 7
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divaw r2,r2,r3
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.endr
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asl_s r0,r0,7
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bmsk r1,r2,6
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xor_s r2,r2,r1
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or_s r0,r0,r1
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.Ldiv_10bit:
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.rep 7
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divaw r2,r2,r3
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.endr
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asl_s r0,r0,7
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bmsk r1,r2,6
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xor_s r2,r2,r1
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or_s r0,r0,r1
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.Ldiv_3bit:
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.rep 3
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divaw r2,r2,r3
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.endr
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asl_s r0,r0,3
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.Ldiv_0bit:
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divaw r1,r2,r3
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bmsk_s r2,r2,2
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tst r1,-0x7e ; 0xffffff82, test for rest or odd
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bmsk_s r1,r1,0
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add_s r0,r0,r2 ; assemble fraction
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add_s r0,r0,r4 ; add in sign & exponent
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j_s.d [blink]
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add.ne r0,r0,r1 ; round to nearest / even
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.balign 4
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.Linf_nan_fp0:
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bic.f 0,r9,r1 ; fp1 Inf -> result NaN
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bic r1,r5,r9 ; fp1 sign
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sub.eq r1,r1,1
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j_s.d [blink]
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xor_s r0,r0,r1
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.Linf_nan_fp1:
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bic r0,r4,r9 ; fp0 sign
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bmsk.f 0,r1,22 ; x/inf -> 0, x/nan -> nan
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xor.eq r1,r1,r9
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j_s.d [blink]
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xor_s r0,r0,r1
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.Linf:
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j_s.d [blink]
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or r0,r10,r9
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.Lret_r4:
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j_s.d [blink]
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mov_s r0,r4
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.balign 4
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.Linf_denorm:
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add.f r12,r4,r4
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asr_l r12,r12,24
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bpl .Linf
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max r12,r12,-24
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.Ldenorm:
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add r1,pcl,42; .Ldenorm_tab-.
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ldb_s r12,[r12,r1]
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mov_s r0,0
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lsr_s r2,r2
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sub_s r1,r1,r12
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j_s.d [r1]
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bic r4,r10,r9
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.byte .Ldenorm_tab-.Lret_r4
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.byte .Ldenorm_tab-.Ldiv_0bit
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.byte .Ldenorm_tab-.Ldiv_3bit-8
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.byte .Ldenorm_tab-.Ldiv_3bit-4
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.byte .Ldenorm_tab-.Ldiv_3bit
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.byte .Ldenorm_tab-.Ldiv_10bit-24
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.byte .Ldenorm_tab-.Ldiv_10bit-20
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.byte .Ldenorm_tab-.Ldiv_10bit-16
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.byte .Ldenorm_tab-.Ldiv_10bit-12
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.byte .Ldenorm_tab-.Ldiv_10bit-8
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.byte .Ldenorm_tab-.Ldiv_10bit-4
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.byte .Ldenorm_tab-.Ldiv_10bit
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.byte .Ldenorm_tab-.Ldiv_17bit-24
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.byte .Ldenorm_tab-.Ldiv_17bit-20
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.byte .Ldenorm_tab-.Ldiv_17bit-16
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.byte .Ldenorm_tab-.Ldiv_17bit-12
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.byte .Ldenorm_tab-.Ldiv_17bit-8
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.byte .Ldenorm_tab-.Ldiv_17bit-4
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.byte .Ldenorm_tab-.Ldiv_17bit
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.byte .Ldenorm_tab-.Ldiv_23bit-20
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.byte .Ldenorm_tab-.Ldiv_23bit-16
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.byte .Ldenorm_tab-.Ldiv_23bit-12
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.byte .Ldenorm_tab-.Ldiv_23bit-8
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.byte .Ldenorm_tab-.Ldiv_23bit-4
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.Ldenorm_tab:
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.byte .Ldenorm_tab-.Ldiv_23bit
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ENDFUNC(__divsf3)
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