2012-03-27 23:13:14 +00:00
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/* Support file for -mfix-vr4120.
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2014-09-21 17:33:12 +00:00
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Copyright (C) 2002-2014 Free Software Foundation, Inc.
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2012-03-27 23:13:14 +00:00
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This file is part of GCC.
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2014-09-21 17:33:12 +00:00
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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2012-03-27 23:13:14 +00:00
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2014-09-21 17:33:12 +00:00
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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2012-03-27 23:13:14 +00:00
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2014-09-21 17:33:12 +00:00
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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2012-03-27 23:13:14 +00:00
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<http://www.gnu.org/licenses/>. */
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/* This file contains functions which implement divsi3 and modsi3 for
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-mfix-vr4120. div and ddiv do not give the correct result when one
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of the operands is negative. */
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.set nomips16
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#define DIV \
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xor $3,$4,$5 /* t = x ^ y */ ; \
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li $2,0x80000000; \
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.set noreorder; \
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bgez $4,1f /* x >= 0 */; \
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and $3,$3,$2 /* t = (x ^ y) & 0x80000000 in delay slot */ ;\
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.set reorder; \
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subu $4,$0,$4 /* x = -x */ ; \
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1:; \
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.set noreorder; \
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bgez $5,2f /* y >= 0 */ ; \
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nop; \
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subu $5,$0,$5 /* y = -y */ ; \
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.set reorder; \
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2:; \
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divu $0,$4,$5; /* we use divu because of INT_MIN */ \
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.set noreorder; \
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bne $5,$0,3f; \
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nop; \
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break 7 /* division on zero y */ ; \
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3:; \
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.set reorder; \
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mflo $2 /* r = x / y */ ; \
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.set noreorder; \
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beq $3,$0,4f /* t == 0 */ ; \
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nop; \
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subu $2,$0,$2 /* r = -r */ ; \
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.set reorder; \
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4:
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.globl __vr4120_divsi3
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.ent __vr4120_divsi3
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__vr4120_divsi3:
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DIV
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j $31
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.end __vr4120_divsi3
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.globl __vr4120_modsi3
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.ent __vr4120_modsi3
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__vr4120_modsi3:
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move $6,$4 # x1 = x
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move $7,$5 # y1 = y
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DIV
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mult $2,$7 # r = r * y1
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mflo $2
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.set noreorder
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j $31
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subu $2,$6,$2 # r = x1 - r in delay slot
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.end __vr4120_modsi3
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