Mercurial > hg > CbC > CbC_gcc
diff gcc/config/mips/vr4120-div.S @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gcc/config/mips/vr4120-div.S Fri Jul 17 14:47:48 2009 +0900 @@ -0,0 +1,74 @@ +/* Support file for -mfix-vr4120. + Copyright (C) 2002, 2004, 2007 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. + +You should have received a copy of the GNU General Public License + along with GCC; see the file COPYING3. If not see +<http://www.gnu.org/licenses/>. */ + +/* This file contains functions which implement divsi3 and modsi3 for + -mfix-vr4120. div and ddiv do not give the correct result when one + of the operands is negative. */ + + .set nomips16 + +#define DIV \ + xor $3,$4,$5 /* t = x ^ y */ ; \ + li $2,0x80000000; \ + .set noreorder; \ + bgez $4,1f /* x >= 0 */; \ + and $3,$3,$2 /* t = (x ^ y) & 0x80000000 in delay slot */ ;\ + .set reorder; \ + subu $4,$0,$4 /* x = -x */ ; \ +1:; \ + .set noreorder; \ + bgez $5,2f /* y >= 0 */ ; \ + nop; \ + subu $5,$0,$5 /* y = -y */ ; \ + .set reorder; \ +2:; \ + divu $0,$4,$5; /* we use divu because of INT_MIN */ \ + .set noreorder; \ + bne $5,$0,3f; \ + nop; \ + break 7 /* division on zero y */ ; \ +3:; \ + .set reorder; \ + mflo $2 /* r = x / y */ ; \ + .set noreorder; \ + beq $3,$0,4f /* t == 0 */ ; \ + nop; \ + subu $2,$0,$2 /* r = -r */ ; \ + .set reorder; \ +4: + + .globl __vr4120_divsi3 + .ent __vr4120_divsi3 +__vr4120_divsi3: + DIV + j $31 + .end __vr4120_divsi3 + + .globl __vr4120_modsi3 + .ent __vr4120_modsi3 +__vr4120_modsi3: + move $6,$4 # x1 = x + move $7,$5 # y1 = y + DIV + mult $2,$7 # r = r * y1 + mflo $2 + .set noreorder + j $31 + subu $2,$6,$2 # r = x1 - r in delay slot + .end __vr4120_modsi3