mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-30 19:53:46 +00:00
222 lines
4.7 KiB
ArmAsm
222 lines
4.7 KiB
ArmAsm
/* Copyright (C) 2008-2015 Free Software Foundation, Inc.
|
|
Contributor: Joern Rennecke <joern.rennecke@embecosm.com>
|
|
on behalf of Synopsys Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "arc-ieee-754.h"
|
|
|
|
#if 0 /* DEBUG */
|
|
.global __divsf3
|
|
FUNC(__divsf3)
|
|
.balign 4
|
|
__divsf3:
|
|
push_s blink
|
|
push_s r1
|
|
bl.d __divsf3_c
|
|
push_s r0
|
|
ld_s r1,[sp,4]
|
|
st_s r0,[sp,4]
|
|
bl.d __divsf3_asm
|
|
pop_s r0
|
|
pop_s r1
|
|
pop_s blink
|
|
cmp r0,r1
|
|
#if 1
|
|
bne abort
|
|
jeq_s [blink]
|
|
b abort
|
|
#else
|
|
bne abort
|
|
j_s [blink]
|
|
#endif
|
|
ENDFUNC(__divsf3)
|
|
#define __divsf3 __divsf3_asm
|
|
#endif /* DEBUG */
|
|
|
|
.balign 4
|
|
__divdf3_support: /* This label makes debugger output saner. */
|
|
FUNC(__divsf3)
|
|
.Ldenorm_fp0:
|
|
norm.f r12,r2 ; flag for 0/x -> 0 check
|
|
bic.ne.f 0,0x60000000,r1 ; denorm/large number -> 0
|
|
beq_s .Lret0_NaN
|
|
tst r1,r9
|
|
add_s r2,r2,r2
|
|
sub_s r12,r12,8
|
|
asl_s r2,r2,r12
|
|
asl_l r12,r12,23
|
|
bne.d .Lpast_denorm_fp0
|
|
add r5,r5,r12
|
|
/* r0 is subnormal, r1 is subnormal or 0. */
|
|
|
|
.balign 4
|
|
.Ldenorm_fp1:
|
|
norm.f r12,r3 ; flag for x/0 -> Inf check
|
|
bic.ne.f 0,0x60000000,r0 ; large number/denorm -> Inf
|
|
beq_s .Linf
|
|
add_s r3,r3,r3
|
|
sub_s r12,r12,8
|
|
asl_s r3,r3,r12
|
|
asl_s r12,r12,23
|
|
b.d .Lpast_denorm_fp1
|
|
add r4,r4,r12
|
|
|
|
.Lret0_NaN:
|
|
bclr.f 0,r1,31 ; 0/0 -> NaN
|
|
bic r0,r10,r9
|
|
j_s.d [blink]
|
|
sub.eq r0,r0,1
|
|
|
|
.global __divsf3
|
|
.balign 4
|
|
.long 0x7f800000 ; exponent mask
|
|
__divsf3:
|
|
ld r9,[pcl,-4]
|
|
bmsk r2,r0,22
|
|
xor r4,r0,r2
|
|
bmsk r3,r1,22
|
|
xor r5,r1,r3
|
|
and r11,r0,r9
|
|
breq.d r11,0,.Ldenorm_fp0
|
|
xor r10,r4,r5
|
|
breq r11,r9,.Linf_nan_fp0
|
|
bset_s r2,r2,23
|
|
and r11,r1,r9
|
|
breq r11,0,.Ldenorm_fp1
|
|
breq r11,r9,.Linf_nan_fp1
|
|
.Lpast_denorm_fp0:
|
|
bset_s r3,r3,23
|
|
.Lpast_denorm_fp1:
|
|
cmp r2,r3
|
|
asl_s r2,r2,6+1
|
|
asl_s r3,r3,7
|
|
add.lo r2,r2,r2
|
|
bclr r8,r9,30 ; exponent bias
|
|
bclr.lo r8,r8,23 ; reduce exp by one if fraction is shifted
|
|
sub r4,r4,r5
|
|
add r4,r4,r8
|
|
xor.f 0,r10,r4
|
|
bmi .Linf_denorm
|
|
and r12,r4,r9
|
|
breq r12,0,.Ldenorm
|
|
sub_s r2,r2,r3 ; discard implicit 1
|
|
.Ldiv_23bit:
|
|
.rep 6
|
|
divaw r2,r2,r3
|
|
.endr
|
|
breq r12,r9,.Linf
|
|
bmsk r0,r2,6
|
|
xor_s r2,r2,r0
|
|
.Ldiv_17bit:
|
|
.rep 7
|
|
divaw r2,r2,r3
|
|
.endr
|
|
asl_s r0,r0,7
|
|
bmsk r1,r2,6
|
|
xor_s r2,r2,r1
|
|
or_s r0,r0,r1
|
|
.Ldiv_10bit:
|
|
.rep 7
|
|
divaw r2,r2,r3
|
|
.endr
|
|
asl_s r0,r0,7
|
|
bmsk r1,r2,6
|
|
xor_s r2,r2,r1
|
|
or_s r0,r0,r1
|
|
.Ldiv_3bit:
|
|
.rep 3
|
|
divaw r2,r2,r3
|
|
.endr
|
|
asl_s r0,r0,3
|
|
.Ldiv_0bit:
|
|
divaw r1,r2,r3
|
|
bmsk_s r2,r2,2
|
|
tst r1,-0x7e ; 0xffffff82, test for rest or odd
|
|
bmsk_s r1,r1,0
|
|
add_s r0,r0,r2 ; assemble fraction
|
|
add_s r0,r0,r4 ; add in sign & exponent
|
|
j_s.d [blink]
|
|
add.ne r0,r0,r1 ; round to nearest / even
|
|
|
|
.balign 4
|
|
.Linf_nan_fp0:
|
|
bic.f 0,r9,r1 ; fp1 Inf -> result NaN
|
|
bic r1,r5,r9 ; fp1 sign
|
|
sub.eq r1,r1,1
|
|
j_s.d [blink]
|
|
xor_s r0,r0,r1
|
|
.Linf_nan_fp1:
|
|
bic r0,r4,r9 ; fp0 sign
|
|
bmsk.f 0,r1,22 ; x/inf -> 0, x/nan -> nan
|
|
xor.eq r1,r1,r9
|
|
j_s.d [blink]
|
|
xor_s r0,r0,r1
|
|
.Linf:
|
|
j_s.d [blink]
|
|
or r0,r10,r9
|
|
|
|
.Lret_r4:
|
|
j_s.d [blink]
|
|
mov_s r0,r4
|
|
.balign 4
|
|
.Linf_denorm:
|
|
add.f r12,r4,r4
|
|
asr_l r12,r12,24
|
|
bpl .Linf
|
|
max r12,r12,-24
|
|
.Ldenorm:
|
|
add r1,pcl,42; .Ldenorm_tab-.
|
|
ldb_s r12,[r12,r1]
|
|
mov_s r0,0
|
|
lsr_s r2,r2
|
|
sub_s r1,r1,r12
|
|
j_s.d [r1]
|
|
bic r4,r10,r9
|
|
.byte .Ldenorm_tab-.Lret_r4
|
|
.byte .Ldenorm_tab-.Ldiv_0bit
|
|
.byte .Ldenorm_tab-.Ldiv_3bit-8
|
|
.byte .Ldenorm_tab-.Ldiv_3bit-4
|
|
.byte .Ldenorm_tab-.Ldiv_3bit
|
|
.byte .Ldenorm_tab-.Ldiv_10bit-24
|
|
.byte .Ldenorm_tab-.Ldiv_10bit-20
|
|
.byte .Ldenorm_tab-.Ldiv_10bit-16
|
|
.byte .Ldenorm_tab-.Ldiv_10bit-12
|
|
.byte .Ldenorm_tab-.Ldiv_10bit-8
|
|
.byte .Ldenorm_tab-.Ldiv_10bit-4
|
|
.byte .Ldenorm_tab-.Ldiv_10bit
|
|
.byte .Ldenorm_tab-.Ldiv_17bit-24
|
|
.byte .Ldenorm_tab-.Ldiv_17bit-20
|
|
.byte .Ldenorm_tab-.Ldiv_17bit-16
|
|
.byte .Ldenorm_tab-.Ldiv_17bit-12
|
|
.byte .Ldenorm_tab-.Ldiv_17bit-8
|
|
.byte .Ldenorm_tab-.Ldiv_17bit-4
|
|
.byte .Ldenorm_tab-.Ldiv_17bit
|
|
.byte .Ldenorm_tab-.Ldiv_23bit-20
|
|
.byte .Ldenorm_tab-.Ldiv_23bit-16
|
|
.byte .Ldenorm_tab-.Ldiv_23bit-12
|
|
.byte .Ldenorm_tab-.Ldiv_23bit-8
|
|
.byte .Ldenorm_tab-.Ldiv_23bit-4
|
|
.Ldenorm_tab:
|
|
.byte .Ldenorm_tab-.Ldiv_23bit
|
|
ENDFUNC(__divsf3)
|