mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-27 14:50:23 +00:00
290 lines
6.9 KiB
ArmAsm
290 lines
6.9 KiB
ArmAsm
;; Copyright (C) 2001-2016 Free Software Foundation, 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/>.
|
|
;;
|
|
;; This code is derived from mulsi3.S, observing that the mstep*16-based
|
|
;; multiplications there, from which it is formed, are actually
|
|
;; zero-extending; in gcc-speak "umulhisi3". The difference to *this*
|
|
;; function is just a missing top mstep*16 sequence and shifts and 64-bit
|
|
;; additions for the high part. Compared to an implementation based on
|
|
;; calling __Mul four times (see default implementation of umul_ppmm in
|
|
;; longlong.h), this will complete in a time between a fourth and a third
|
|
;; of that, assuming the value-based optimizations don't strike. If they
|
|
;; all strike there (very often) but none here, we still win, though by a
|
|
;; lesser margin, due to lesser total overhead.
|
|
|
|
#define L(x) .x
|
|
#define CONCAT1(a, b) CONCAT2(a, b)
|
|
#define CONCAT2(a, b) a ## b
|
|
|
|
#ifdef __USER_LABEL_PREFIX__
|
|
# define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
|
|
#else
|
|
# define SYM(x) x
|
|
#endif
|
|
|
|
.global SYM(__umulsidi3)
|
|
.type SYM(__umulsidi3),@function
|
|
SYM(__umulsidi3):
|
|
#if defined (__CRIS_arch_version) && __CRIS_arch_version >= 10
|
|
;; Can't have the mulu.d last on a cache-line, due to a hardware bug. See
|
|
;; the documentation for -mmul-bug-workaround.
|
|
;; Not worthwhile to conditionalize here.
|
|
.p2alignw 2,0x050f
|
|
mulu.d $r11,$r10
|
|
ret
|
|
move $mof,$r11
|
|
#else
|
|
move.d $r11,$r9
|
|
bound.d $r10,$r9
|
|
cmpu.w 65535,$r9
|
|
bls L(L3)
|
|
move.d $r10,$r12
|
|
|
|
move.d $r10,$r13
|
|
movu.w $r11,$r9 ; ab*cd = (a*c)<<32 (a*d + b*c)<<16 + b*d
|
|
|
|
;; We're called for floating point numbers very often with the "low" 16
|
|
;; bits zero, so it's worthwhile to optimize for that.
|
|
|
|
beq L(L6) ; d == 0?
|
|
lslq 16,$r13
|
|
|
|
beq L(L7) ; b == 0?
|
|
clear.w $r10
|
|
|
|
mstep $r9,$r13 ; d*b
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
mstep $r9,$r13
|
|
|
|
L(L7):
|
|
test.d $r10
|
|
mstep $r9,$r10 ; d*a
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
mstep $r9,$r10
|
|
|
|
;; d*a in $r10, d*b in $r13, ab in $r12 and cd in $r11
|
|
;; $r9 = d, need to do b*c and a*c; we can drop d.
|
|
;; so $r9 is up for use and we can shift down $r11 as the mstep
|
|
;; source for the next mstep-part.
|
|
|
|
L(L8):
|
|
lsrq 16,$r11
|
|
move.d $r12,$r9
|
|
lslq 16,$r9
|
|
beq L(L9) ; b == 0?
|
|
mstep $r11,$r9
|
|
|
|
mstep $r11,$r9 ; b*c
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
mstep $r11,$r9
|
|
L(L9):
|
|
|
|
;; d*a in $r10, d*b in $r13, c*b in $r9, ab in $r12 and c in $r11,
|
|
;; need to do a*c. We want that to end up in $r11, so we shift up $r11 to
|
|
;; now use as the destination operand. We'd need a test insn to update N
|
|
;; to do it the other way round.
|
|
|
|
lsrq 16,$r12
|
|
lslq 16,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
mstep $r12,$r11
|
|
|
|
;; d*a in $r10, d*b in $r13, c*b in $r9, a*c in $r11 ($r12 free).
|
|
;; Need (a*d + b*c)<<16 + b*d into $r10 and
|
|
;; a*c + (a*d + b*c)>>16 plus carry from the additions into $r11.
|
|
|
|
add.d $r9,$r10 ; (a*d + b*c) - may produce a carry.
|
|
scs $r12 ; The carry corresponds to bit 16 of $r11.
|
|
lslq 16,$r12
|
|
add.d $r12,$r11 ; $r11 = a*c + carry from (a*d + b*c).
|
|
|
|
#if defined (__CRIS_arch_version) && __CRIS_arch_version >= 8
|
|
swapw $r10
|
|
addu.w $r10,$r11 ; $r11 = a*c + (a*d + b*c) >> 16 including carry.
|
|
clear.w $r10 ; $r10 = (a*d + b*c) << 16
|
|
#else
|
|
move.d $r10,$r9
|
|
lsrq 16,$r9
|
|
add.d $r9,$r11 ; $r11 = a*c + (a*d + b*c) >> 16 including carry.
|
|
lslq 16,$r10 ; $r10 = (a*d + b*c) << 16
|
|
#endif
|
|
add.d $r13,$r10 ; $r10 = (a*d + b*c) << 16 + b*d - may produce a carry.
|
|
scs $r9
|
|
ret
|
|
add.d $r9,$r11 ; Last carry added to the high-order 32 bits.
|
|
|
|
L(L6):
|
|
clear.d $r13
|
|
ba L(L8)
|
|
clear.d $r10
|
|
|
|
L(L11):
|
|
clear.d $r10
|
|
ret
|
|
clear.d $r11
|
|
|
|
L(L3):
|
|
;; Form the maximum in $r10, by knowing the minimum, $r9.
|
|
;; (We don't know which one of $r10 or $r11 it is.)
|
|
;; Check if the largest operand is still just 16 bits.
|
|
|
|
xor $r9,$r10
|
|
xor $r11,$r10
|
|
cmpu.w 65535,$r10
|
|
bls L(L5)
|
|
movu.w $r9,$r13
|
|
|
|
;; We have ab*cd = (a*c)<<32 + (a*d + b*c)<<16 + b*d, but c==0
|
|
;; so we only need (a*d)<<16 + b*d with d = $r13, ab = $r10.
|
|
;; Remember that the upper part of (a*d)<<16 goes into the lower part
|
|
;; of $r11 and there may be a carry from adding the low 32 parts.
|
|
beq L(L11) ; d == 0?
|
|
move.d $r10,$r9
|
|
|
|
lslq 16,$r9
|
|
beq L(L10) ; b == 0?
|
|
clear.w $r10
|
|
|
|
mstep $r13,$r9 ; b*d
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
mstep $r13,$r9
|
|
L(L10):
|
|
test.d $r10
|
|
mstep $r13,$r10 ; a*d
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
move.d $r10,$r11
|
|
lsrq 16,$r11
|
|
lslq 16,$r10
|
|
add.d $r9,$r10
|
|
scs $r12
|
|
ret
|
|
add.d $r12,$r11
|
|
|
|
L(L5):
|
|
;; We have ab*cd = (a*c)<<32 + (a*d + b*c)<<16 + b*d, but a and c==0
|
|
;; so b*d (with min=b=$r13, max=d=$r10) it is. As it won't overflow the
|
|
;; 32-bit part, just set $r11 to 0.
|
|
|
|
lslq 16,$r10
|
|
clear.d $r11
|
|
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
mstep $r13,$r10
|
|
ret
|
|
mstep $r13,$r10
|
|
#endif
|
|
L(Lfe1):
|
|
.size SYM(__umulsidi3),L(Lfe1)-SYM(__umulsidi3)
|