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75 lines
2.0 KiB
ArmAsm
75 lines
2.0 KiB
ArmAsm
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/* Support file for -mfix-vr4120.
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Copyright (C) 2002, 2004, 2007 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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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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