2015-08-28 15:33:40 +00:00
|
|
|
/* Copyright (C) 2008-2015 Free Software Foundation, Inc.
|
2014-09-21 17:33:12 +00:00
|
|
|
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 __muldf3
|
|
|
|
|
.balign 4
|
|
|
|
|
__muldf3:
|
|
|
|
|
push_s blink
|
|
|
|
|
push_s r2
|
|
|
|
|
push_s r3
|
|
|
|
|
push_s r0
|
|
|
|
|
bl.d __muldf3_c
|
|
|
|
|
push_s r1
|
|
|
|
|
ld_s r2,[sp,12]
|
|
|
|
|
ld_s r3,[sp,8]
|
|
|
|
|
st_s r0,[sp,12]
|
|
|
|
|
st_s r1,[sp,8]
|
|
|
|
|
pop_s r1
|
|
|
|
|
bl.d __muldf3_asm
|
|
|
|
|
pop_s r0
|
|
|
|
|
pop_s r3
|
|
|
|
|
pop_s r2
|
|
|
|
|
pop_s blink
|
|
|
|
|
cmp r0,r2
|
|
|
|
|
cmp.eq r1,r3
|
|
|
|
|
jeq_s [blink]
|
|
|
|
|
b abort
|
|
|
|
|
#define __muldf3 __muldf3_asm
|
|
|
|
|
#endif /* DEBUG */
|
|
|
|
|
|
|
|
|
|
__muldf3_support: /* This label makes debugger output saner. */
|
|
|
|
|
.balign 4
|
|
|
|
|
FUNC(__muldf3)
|
|
|
|
|
.Ldenorm_2:
|
|
|
|
|
breq.d DBL1L,0,.Lret0_2 ; 0 input -> 0 output
|
|
|
|
|
norm.f r12,DBL1L
|
|
|
|
|
mov.mi r12,21
|
|
|
|
|
add.pl r12,r12,22
|
|
|
|
|
neg r11,r12
|
|
|
|
|
asl_s r12,r12,20
|
|
|
|
|
lsr.f DBL1H,DBL1L,r11
|
|
|
|
|
ror DBL1L,DBL1L,r11
|
|
|
|
|
sub_s DBL0H,DBL0H,r12
|
|
|
|
|
mov.eq DBL1H,DBL1L
|
|
|
|
|
sub_l DBL1L,DBL1L,DBL1H
|
|
|
|
|
/* Fall through. */
|
|
|
|
|
.global __muldf3
|
|
|
|
|
.balign 4
|
|
|
|
|
__muldf3:
|
|
|
|
|
mululw 0,DBL0L,DBL1L
|
|
|
|
|
machulw r4,DBL0L,DBL1L
|
|
|
|
|
ld.as r9,[pcl,0x67] ; ((.L7ff00000-.+2)/4)]
|
|
|
|
|
bmsk r6,DBL0H,19
|
|
|
|
|
bset r6,r6,20
|
|
|
|
|
mov r8,acc2
|
|
|
|
|
mululw 0,r4,1
|
|
|
|
|
and r11,DBL0H,r9
|
|
|
|
|
breq.d r11,0,.Ldenorm_dbl0
|
|
|
|
|
and r12,DBL1H,r9
|
|
|
|
|
breq.d r12,0,.Ldenorm_dbl1
|
|
|
|
|
maclw 0,r6,DBL1L
|
|
|
|
|
machulw 0,r6,DBL1L
|
|
|
|
|
breq.d r11,r9,.Linf_nan
|
|
|
|
|
bmsk r10,DBL1H,19
|
|
|
|
|
breq.d r12,r9,.Linf_nan
|
|
|
|
|
bset r10,r10,20
|
|
|
|
|
maclw 0,r10,DBL0L
|
|
|
|
|
machulw r5,r10,DBL0L
|
|
|
|
|
add_s r12,r12,r11 ; add exponents
|
|
|
|
|
mov r4,acc2
|
|
|
|
|
mululw 0,r5,1
|
|
|
|
|
maclw 0,r6,r10
|
|
|
|
|
machulw r7,r6,r10 ; fraction product in r7:acc2:r4:r8
|
|
|
|
|
tst r8,r8
|
|
|
|
|
bclr r8,r9,30 ; 0x3ff00000
|
|
|
|
|
bset.ne r4,r4,0 ; put least significant word into sticky bit
|
|
|
|
|
bclr r6,r9,20 ; 0x7fe00000
|
|
|
|
|
lsr.f r10,r7,9
|
|
|
|
|
rsub.eq r8,r8,r9 ; 0x40000000
|
|
|
|
|
sub r12,r12,r8 ; subtract bias + implicit 1
|
|
|
|
|
brhs.d r12,r6,.Linf_denorm
|
|
|
|
|
rsub r10,r10,12
|
|
|
|
|
.Lshift_frac:
|
|
|
|
|
neg r8,r10
|
|
|
|
|
asl r6,r4,r10
|
|
|
|
|
lsr DBL0L,r4,r8
|
|
|
|
|
add.f 0,r6,r6
|
|
|
|
|
btst.eq DBL0L,0
|
|
|
|
|
cmp.eq r4,r4 ; round to nearest / round to even
|
|
|
|
|
asl r4,acc2,r10
|
|
|
|
|
lsr r5,acc2,r8
|
|
|
|
|
adc.f DBL0L,DBL0L,r4
|
|
|
|
|
xor.f 0,DBL0H,DBL1H
|
|
|
|
|
asl r7,r7,r10
|
|
|
|
|
add_s r12,r12,r5
|
|
|
|
|
adc DBL0H,r12,r7
|
|
|
|
|
j_s.d [blink]
|
|
|
|
|
bset.mi DBL0H,DBL0H,31
|
|
|
|
|
|
|
|
|
|
/* N.B. This is optimized for ARC700.
|
|
|
|
|
ARC600 has very different scheduling / instruction selection criteria. */
|
|
|
|
|
|
|
|
|
|
/* If one number is denormal, subtract some from the exponent of the other
|
|
|
|
|
one (if the other exponent is too small, return 0), and normalize the
|
|
|
|
|
denormal. Then re-run the computation. */
|
|
|
|
|
.Lret0_2:
|
|
|
|
|
lsr_s DBL0H,DBL0H,31
|
|
|
|
|
asl_s DBL0H,DBL0H,31
|
|
|
|
|
j_s.d [blink]
|
|
|
|
|
mov_s DBL0L,0
|
|
|
|
|
.balign 4
|
|
|
|
|
.Ldenorm_dbl0:
|
|
|
|
|
mov_s r12,DBL0L
|
|
|
|
|
mov_s DBL0L,DBL1L
|
|
|
|
|
mov_s DBL1L,r12
|
|
|
|
|
mov_s r12,DBL0H
|
|
|
|
|
mov_s DBL0H,DBL1H
|
|
|
|
|
mov_s DBL1H,r12
|
|
|
|
|
and r11,DBL0H,r9
|
|
|
|
|
.Ldenorm_dbl1:
|
|
|
|
|
brhs r11,r9,.Linf_nan
|
|
|
|
|
brhs 0x3ca00001,r11,.Lret0
|
|
|
|
|
sub_s DBL0H,DBL0H,DBL1H
|
|
|
|
|
bmsk.f DBL1H,DBL1H,30
|
|
|
|
|
add_s DBL0H,DBL0H,DBL1H
|
|
|
|
|
beq.d .Ldenorm_2
|
|
|
|
|
norm r12,DBL1H
|
|
|
|
|
sub_s r12,r12,10
|
|
|
|
|
asl r5,r12,20
|
|
|
|
|
asl_s DBL1H,DBL1H,r12
|
|
|
|
|
sub DBL0H,DBL0H,r5
|
|
|
|
|
neg r5,r12
|
|
|
|
|
lsr r6,DBL1L,r5
|
|
|
|
|
asl_s DBL1L,DBL1L,r12
|
|
|
|
|
b.d __muldf3
|
|
|
|
|
add_s DBL1H,DBL1H,r6
|
|
|
|
|
|
|
|
|
|
.Lret0: xor_s DBL0H,DBL0H,DBL1H
|
|
|
|
|
bclr DBL1H,DBL0H,31
|
|
|
|
|
xor_s DBL0H,DBL0H,DBL1H
|
|
|
|
|
j_s.d [blink]
|
|
|
|
|
mov_s DBL0L,0
|
|
|
|
|
|
|
|
|
|
.balign 4
|
|
|
|
|
.Linf_nan:
|
|
|
|
|
bclr r12,DBL1H,31
|
|
|
|
|
xor_s DBL1H,DBL1H,DBL0H
|
|
|
|
|
bclr_s DBL0H,DBL0H,31
|
|
|
|
|
max r8,DBL0H,r12 ; either NaN -> NaN ; otherwise inf
|
|
|
|
|
or.f 0,DBL0H,DBL0L
|
|
|
|
|
mov_s DBL0L,0
|
|
|
|
|
or.ne.f DBL1L,DBL1L,r12
|
|
|
|
|
not_s DBL0H,DBL0L ; inf * 0 -> NaN
|
|
|
|
|
mov.ne DBL0H,r8
|
|
|
|
|
tst_s DBL1H,DBL1H
|
|
|
|
|
j_s.d [blink]
|
|
|
|
|
bset.mi DBL0H,DBL0H,31
|
|
|
|
|
|
|
|
|
|
/* We have checked for infinity / NaN input before, and transformed
|
|
|
|
|
denormalized inputs into normalized inputs. Thus, the worst case
|
|
|
|
|
exponent overflows are:
|
|
|
|
|
1 + 1 - 0x400 == 0xc02 : maximum underflow
|
|
|
|
|
0x7fe + 0x7fe - 0x3ff == 0xbfd ; maximum overflow
|
|
|
|
|
N.B. 0x7e and 0x7f are also values for overflow.
|
|
|
|
|
|
|
|
|
|
If (r12 <= -54), we have an underflow to zero. */
|
|
|
|
|
.balign 4
|
|
|
|
|
.Linf_denorm:
|
|
|
|
|
lsr r6,r12,28
|
|
|
|
|
brlo.d r6,0xc,.Linf
|
|
|
|
|
asr r6,r12,20
|
|
|
|
|
add.f r10,r10,r6
|
|
|
|
|
brgt.d r10,0,.Lshift_frac
|
|
|
|
|
mov_s r12,0
|
|
|
|
|
beq.d .Lround_frac
|
|
|
|
|
add r10,r10,32
|
|
|
|
|
.Lshift32_frac:
|
|
|
|
|
tst r4,r4
|
|
|
|
|
mov r4,acc2
|
|
|
|
|
bset.ne r4,r4,1
|
|
|
|
|
mululw 0,r7,1
|
|
|
|
|
brge.d r10,1,.Lshift_frac
|
|
|
|
|
mov r7,0
|
|
|
|
|
breq.d r10,0,.Lround_frac
|
|
|
|
|
add r10,r10,32
|
|
|
|
|
brgt r10,21,.Lshift32_frac
|
|
|
|
|
b_s .Lret0
|
|
|
|
|
|
|
|
|
|
.Lround_frac:
|
|
|
|
|
add.f 0,r4,r4
|
|
|
|
|
btst.eq acc2,0
|
|
|
|
|
mov_s DBL0L,acc2
|
|
|
|
|
mov_s DBL0H,r7
|
|
|
|
|
adc.eq.f DBL0L,DBL0L,0
|
|
|
|
|
j_s.d [blink]
|
|
|
|
|
adc.eq DBL0H,DBL0H,0
|
|
|
|
|
|
|
|
|
|
.Linf: mov_s DBL0L,0
|
|
|
|
|
xor.f DBL1H,DBL1H,DBL0H
|
|
|
|
|
mov_s DBL0H,r9
|
|
|
|
|
j_s.d [blink]
|
|
|
|
|
bset.mi DBL0H,DBL0H,31
|
|
|
|
|
ENDFUNC(__muldf3)
|
|
|
|
|
|
|
|
|
|
.balign 4
|
|
|
|
|
.L7ff00000:
|
|
|
|
|
.long 0x7ff00000
|
