;; Copyright (C) 2001-2021 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) |