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authorYamaArashi <shadow962@live.com>2016-01-06 01:47:28 -0800
committerYamaArashi <shadow962@live.com>2016-01-06 01:47:28 -0800
commitbe8b04496302184c6e8f04d6179f9c3afc50aeb6 (patch)
tree726e2468c0c07add773c0dbd86ab6386844259ae /gcc/config/d30v/libgcc1.asm
initial commit
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+/* CYGNUS LOCAL -- meissner/d30v */
+/* Assembly support functions for libgcc1.
+ *
+ * Copyright (C) 1997 Free Software Foundation, Inc.
+ * Contributed by Cygnus Support
+ *
+ * This file 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 2, or (at your option) any
+ * later version.
+ *
+ * In addition to the permissions in the GNU General Public License, the
+ * Free Software Foundation gives you unlimited permission to link the
+ * compiled version of this file with other programs, and to distribute
+ * those programs without any restriction coming from the use of this
+ * file. (The General Public License restrictions do apply in other
+ * respects; for example, they cover modification of the file, and
+ * distribution when not linked into another program.)
+ *
+ * This file 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 this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * As a special exception, if you link this library with files
+ * compiled with GCC to produce an executable, this does not cause
+ * the resulting executable to be covered by the GNU General Public License.
+ * This exception does not however invalidate any other reasons why
+ * the executable file might be covered by the GNU General Public License.
+ */
+
+
+#ifdef L_udivsi3
+
+/* For division, we use the following algorithm:
+ *
+ * unsigned
+ * __divsi3 (unsigned a, unsigned b)
+ * {
+ * unsigned al = a;
+ * unsigned ah = 0;
+ * unsigned tmpf;
+ * int i;
+ *
+ * for (i = 32; i > 0; i--)
+ * {
+ * ah = (ah << 1) | (al >> 31);
+ * tmpf = (ah >= b) ? 1 : 0;
+ * ah -= ((tmpf) ? b : 0);
+ * al = (al << 1) | tmpf;
+ * }
+ *
+ * return al; // for __udivsi3
+ * return ah; // for __umodsi3
+ * }
+ */
+
+ .file "_udivsi3"
+ .text
+ .globl __umodsi3
+ .globl __udivsi3
+ .type __umodsi3,@function
+ .type __udivsi3,@function
+ .stabs "libgcc1.asm",100,0,0,__umodsi3
+ .stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0
+ .stabs "__umodsi3:F(0,1)",36,0,1,__umodsi3
+ .stabs "a:P(0,1)",64,0,1,2
+ .stabs "b:P(0,1)",64,0,1,3
+
+__umodsi3:
+ bra.s .Lmerge || orfg f1,f1,1 ; indicate this is __umodsi3
+.Lumod:
+ .size __umodsi3,.Lumod-__umodsi3
+ .stabs "",36,0,0,.Lumod-__umodsi3
+
+ .stabs "__udivsi3:F(0,1)",36,0,1,__udivsi3
+ .stabs "a:P(0,1)",64,0,1,2
+ .stabs "b:P(0,1)",64,0,1,3
+__udivsi3:
+ andfg f1,f1,0 || nop ; indicate this is __udivsi3
+
+.Lmerge:
+ ; r2 = al
+ ; r3 = b
+ ; r4 = ah
+ ; r5 = loop counter
+ ; f0 = tmpf
+ ; f1 = 1 if this is mod, 0 if this is div
+ or r4,r0,0 || sub r5,r0,-32 ; ah = 0, loop = 32
+
+.Lloop:
+ src r4,r2,-1 || sub r5,r5,1 ; ah = (ah << 1) | (al >> 31); decrement loop count
+ cmpuge f0,r4,r3 || sra r2,r2,-1 ; f0 = (ah >= b); al <<= 1
+ sub/tx r4,r4,r3 || or/tx r2,r2,1 ; ah -= (tmpf) ? b : 0; al |= tmpf
+ bratnz.s r5,.Lloop || nop ; loop back if not done
+ jmp link || or/xt r2,r0,r4 ; if mod, update register, then return to user
+.Ludiv:
+ .size __udivsi3,.Ludiv-__udivsi3
+ .stabs "",36,0,0,.Ludiv-__udivsi3
+
+#endif /* L_udivsi3 */
+
+
+#ifdef L_divsi3
+
+/* For division, we use the following algorithm:
+ *
+ * unsigned
+ * __divsi3 (unsigned a, unsigned b)
+ * {
+ * unsigned al = __builtin_abs (a);
+ * unsigned b2 = __builtin_abs (b);
+ * unsigned ah = 0;
+ * unsigned tmpf;
+ * int i;
+ *
+ * for (i = 32; i > 0; i--)
+ * {
+ * ah = (ah << 1) | (al >> 31);
+ * tmpf = (ah >= b2) ? 1 : 0;
+ * ah -= ((tmpf) ? b2 : 0);
+ * al = (al << 1) | tmpf;
+ * }
+ *
+ * if (a < 0)
+ * ah = -ah, al = -al;
+ *
+ * if (b < 0)
+ * al = -al;
+ *
+ * return al; // for __divsi3
+ * return ah; // for __modsi3
+ * }
+ */
+
+ .file "_divsi3"
+ .text
+ .globl __modsi3
+ .globl __divsi3
+ .type __modsi3,@function
+ .type __divsi3,@function
+ .stabs "libgcc1.asm",100,0,0,__modsi3
+ .stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0
+ .stabs "__modsi3:F(0,1)",36,0,1,__modsi3
+ .stabs "a:P(0,1)",64,0,1,2
+ .stabs "b:P(0,1)",64,0,1,3
+
+__modsi3:
+ bra.s .Lmerge || orfg f1,f1,1 ; indicate this is __modsi3
+.Lmod:
+ .size __modsi3,.Lmod-__modsi3
+ .stabs "",36,0,0,.Lmod-__modsi3
+
+ .stabs "__divsi3:F(0,1)",36,0,1,__divsi3
+ .stabs "a:P(0,1)",64,0,1,2
+ .stabs "b:P(0,1)",64,0,1,3
+__divsi3:
+ andfg f1,f1,0 || nop ; indicate this is __divsi3
+
+.Lmerge:
+ ; r2 = al
+ ; r3 = b2
+ ; r4 = ah
+ ; r5 = loop counter
+ ; r6 = a
+ ; r7 = b
+ ; f0 = tmpf
+ ; f1 = 1 if this is mod, 0 if this is div
+ or r6,r0,r2 || or r7,r0,r3 ; copy original inputs
+ abs r2,r2 || abs r3,r3 ; make both postive
+ or r4,r0,0 || sub r5,r0,-32 ; ah = 0, loop = 32
+
+.Lloop:
+ src r4,r2,-1 || sub r5,r5,1 ; ah = (ah << 1) | (al >> 31); decrement loop count
+ cmpuge f0,r4,r3 || sra r2,r2,-1 ; f0 = (ah >= b); al <<= 1
+ sub/tx r4,r4,r3 || or/tx r2,r2,1 ; ah -= (tmpf) ? b : 0; al |= tmpf
+ bratnz.s r5,.Lloop || nop ; loop back if not done
+ cmplt f0,r6,0 || nop ; f0 = (a < 0)
+
+ sub/tx r2,r0,r2 || sub/tx r4,r0,r4 ; negate both al, ah if (a < 0)
+ cmplt f0,r7,0 -> sub/tx r2,r0,r2 ; negate al if (b < 0)
+ jmp link || or/xt r2,r0,r4 ; update result if mod; return to user
+.Ldiv:
+ .size __divsi3,.Ldiv-__divsi3
+ .stabs "",36,0,0,.Ldiv-__divsi3
+
+#endif /* L_divsi3 */
+/* END CYGNUS LOCAL -- meissner/d30v */