--- /dev/null
+/* 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
projects / msp430-gcc.git / blobdiff