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author | K. Richard Pixley <rich@cygnus> | 1992-02-13 08:33:54 +0000 |
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committer | K. Richard Pixley <rich@cygnus> | 1992-02-13 08:33:54 +0000 |
commit | a39116f1c91d3642c068d9df871338cca9006be2 (patch) | |
tree | dbd53d94ef859ca6425ef5370573030d4766161b /gas/flonum-mult.c | |
parent | 77806c3e79cc6ebd5ab62ce46f7cdeecad50ca52 (diff) | |
download | gdb-a39116f1c91d3642c068d9df871338cca9006be2.zip gdb-a39116f1c91d3642c068d9df871338cca9006be2.tar.gz gdb-a39116f1c91d3642c068d9df871338cca9006be2.tar.bz2 |
White space and comments only. The devo tree prior to this delta is
tagged as "vanilla" for your convenience.
There are also some comment changes.
Diffstat (limited to 'gas/flonum-mult.c')
-rw-r--r-- | gas/flonum-mult.c | 322 |
1 files changed, 160 insertions, 162 deletions
diff --git a/gas/flonum-mult.c b/gas/flonum-mult.c index b01f93b..c5aa0e8 100644 --- a/gas/flonum-mult.c +++ b/gas/flonum-mult.c @@ -1,201 +1,199 @@ /* flonum_multip.c - multiply two flonums Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc. - -This file is part of Gas, the GNU Assembler. - -The GNU assembler is distributed in the hope that it will be -useful, but WITHOUT ANY WARRANTY. No author or distributor -accepts responsibility to anyone for the consequences of using it -or for whether it serves any particular purpose or works at all, -unless he says so in writing. Refer to the GNU Assembler General -Public License for full details. - -Everyone is granted permission to copy, modify and redistribute -the GNU Assembler, but only under the conditions described in the -GNU Assembler General Public License. A copy of this license is -supposed to have been given to you along with the GNU Assembler -so you can know your rights and responsibilities. It should be -in a file named COPYING. Among other things, the copyright -notice and this notice must be preserved on all copies. */ - -/* static const char rcsid[] = "$Id$"; */ + + This file is part of Gas, the GNU Assembler. + + The GNU assembler is distributed in the hope that it will be + useful, but WITHOUT ANY WARRANTY. No author or distributor + accepts responsibility to anyone for the consequences of using it + or for whether it serves any particular purpose or works at all, + unless he says so in writing. Refer to the GNU Assembler General + Public License for full details. + + Everyone is granted permission to copy, modify and redistribute + the GNU Assembler, but only under the conditions described in the + GNU Assembler General Public License. A copy of this license is + supposed to have been given to you along with the GNU Assembler + so you can know your rights and responsibilities. It should be + in a file named COPYING. Among other things, the copyright + notice and this notice must be preserved on all copies. */ #include "flonum.h" /* plan for a . b => p(roduct) - - + + +-------+-------+-/ /-+-------+-------+ | a | a | ... | a | a | | A | A-1 | | 1 | 0 | +-------+-------+-/ /-+-------+-------+ - - + + +-------+-------+-/ /-+-------+-------+ | b | b | ... | b | b | | B | B-1 | | 1 | 0 | +-------+-------+-/ /-+-------+-------+ - - + + +-------+-------+-/ /-+-------+-/ /-+-------+-------+ | p | p | ... | p | ... | p | p | | A+B+1| A+B | | N | | 1 | 0 | +-------+-------+-/ /-+-------+-/ /-+-------+-------+ - - /^\ - (carry) a .b ... | ... a .b a .b - A B | 0 1 0 0 - | - ... | ... a .b - | 1 0 - | - | ... - | - | - | - | ___ - | \ - +----- P = > a .b - N /__ i j - - N = 0 ... A+B - - for all i,j where i+j=N - [i,j integers > 0] - -a[], b[], p[] may not intersect. -Zero length factors signify 0 significant bits: treat as 0.0. -0.0 factors do the right thing. -Zero length product OK. - -I chose the ForTran accent "foo[bar]" instead of the C accent "*garply" -because I felt the ForTran way was more intuitive. The C way would -probably yield better code on most C compilers. Dean Elsner. -(C style also gives deeper insight [to me] ... oh well ...) -*/ + + /^\ + (carry) a .b ... | ... a .b a .b + A B | 0 1 0 0 + | + ... | ... a .b + | 1 0 + | + | ... + | + | + | + | ___ + | \ + +----- P = > a .b + N /__ i j + + N = 0 ... A+B + + for all i,j where i+j=N + [i,j integers > 0] + + a[], b[], p[] may not intersect. + Zero length factors signify 0 significant bits: treat as 0.0. + 0.0 factors do the right thing. + Zero length product OK. + + I chose the ForTran accent "foo[bar]" instead of the C accent "*garply" + because I felt the ForTran way was more intuitive. The C way would + probably yield better code on most C compilers. Dean Elsner. + (C style also gives deeper insight [to me] ... oh well ...) + */ void flonum_multip (a, b, product) const FLONUM_TYPE *a; const FLONUM_TYPE *b; FLONUM_TYPE *product; { - int size_of_a; /* 0 origin */ - int size_of_b; /* 0 origin */ - int size_of_product; /* 0 origin */ - int size_of_sum; /* 0 origin */ - int extra_product_positions;/* 1 origin */ - unsigned long work; - unsigned long carry; - long exponent; - LITTLENUM_TYPE * q; - long significant; /* TRUE when we emit a non-0 littlenum */ - /* ForTran accent follows. */ - int P; /* Scan product low-order -> high. */ - int N; /* As in sum above. */ - int A; /* Which [] of a? */ - int B; /* Which [] of b? */ - - if((a->sign!='-' && a->sign!='+') || (b->sign!='-' && b->sign!='+')) { - /* ... - Got to fail somehow. Any suggestions? */ - product->sign=0; - return; - } - product -> sign = (a->sign == b->sign) ? '+' : '-'; - size_of_a = a -> leader - a -> low; - size_of_b = b -> leader - b -> low; - exponent = a -> exponent + b -> exponent; - size_of_product = product -> high - product -> low; - size_of_sum = size_of_a + size_of_b; - extra_product_positions = size_of_product - size_of_sum; - if (extra_product_positions < 0) - { - P = extra_product_positions; /* P < 0 */ - exponent -= extra_product_positions; /* Increases exponent. */ - } - else - { - P = 0; - } - carry = 0; - significant = 0; - for (N = 0; - N <= size_of_sum; - N++) - { - work = carry; - carry = 0; - for (A = 0; - A <= N; - A ++) - { - B = N - A; - if (A <= size_of_a && B <= size_of_b && B >= 0) + int size_of_a; /* 0 origin */ + int size_of_b; /* 0 origin */ + int size_of_product; /* 0 origin */ + int size_of_sum; /* 0 origin */ + int extra_product_positions;/* 1 origin */ + unsigned long work; + unsigned long carry; + long exponent; + LITTLENUM_TYPE * q; + long significant; /* TRUE when we emit a non-0 littlenum */ + /* ForTran accent follows. */ + int P; /* Scan product low-order -> high. */ + int N; /* As in sum above. */ + int A; /* Which [] of a? */ + int B; /* Which [] of b? */ + + if((a->sign!='-' && a->sign!='+') || (b->sign!='-' && b->sign!='+')) { + /* ... + Got to fail somehow. Any suggestions? */ + product->sign=0; + return; + } + product -> sign = (a->sign == b->sign) ? '+' : '-'; + size_of_a = a -> leader - a -> low; + size_of_b = b -> leader - b -> low; + exponent = a -> exponent + b -> exponent; + size_of_product = product -> high - product -> low; + size_of_sum = size_of_a + size_of_b; + extra_product_positions = size_of_product - size_of_sum; + if (extra_product_positions < 0) + { + P = extra_product_positions; /* P < 0 */ + exponent -= extra_product_positions; /* Increases exponent. */ + } + else { + P = 0; + } + carry = 0; + significant = 0; + for (N = 0; + N <= size_of_sum; + N++) + { + work = carry; + carry = 0; + for (A = 0; + A <= N; + A ++) + { + B = N - A; + if (A <= size_of_a && B <= size_of_b && B >= 0) + { #ifdef TRACE -printf("a:low[%d.]=%04x b:low[%d.]=%04x work_before=%08x\n", A, a->low[A], B, b->low[B], work); + printf("a:low[%d.]=%04x b:low[%d.]=%04x work_before=%08x\n", A, a->low[A], B, b->low[B], work); #endif - work += a -> low [A] * b -> low [B]; - carry += work >> LITTLENUM_NUMBER_OF_BITS; - work &= LITTLENUM_MASK; + work += a -> low [A] * b -> low [B]; + carry += work >> LITTLENUM_NUMBER_OF_BITS; + work &= LITTLENUM_MASK; #ifdef TRACE -printf("work=%08x carry=%04x\n", work, carry); + printf("work=%08x carry=%04x\n", work, carry); #endif - } - } - significant |= work; - if (significant || P<0) - { - if (P >= 0) - { - product -> low [P] = work; + } + } + significant |= work; + if (significant || P<0) + { + if (P >= 0) + { + product -> low [P] = work; #ifdef TRACE -printf("P=%d. work[p]:=%04x\n", P, work); + printf("P=%d. work[p]:=%04x\n", P, work); #endif + } + P ++; + } + else + { + extra_product_positions ++; + exponent ++; + } } - P ++; - } - else - { - extra_product_positions ++; - exponent ++; - } - } - /* - * [P]-> position # size_of_sum + 1. - * This is where 'carry' should go. - */ + /* + * [P]-> position # size_of_sum + 1. + * This is where 'carry' should go. + */ #ifdef TRACE -printf("final carry =%04x\n", carry); + printf("final carry =%04x\n", carry); #endif - if (carry) - { - if (extra_product_positions > 0) - { - product -> low [P] = carry; - } - else - { - /* No room at high order for carry littlenum. */ - /* Shift right 1 to make room for most significant littlenum. */ - exponent ++; - P --; - for (q = product -> low + P; - q >= product -> low; - q --) + if (carry) { - work = * q; - * q = carry; - carry = work; + if (extra_product_positions > 0) + { + product -> low [P] = carry; + } + else + { + /* No room at high order for carry littlenum. */ + /* Shift right 1 to make room for most significant littlenum. */ + exponent ++; + P --; + for (q = product -> low + P; + q >= product -> low; + q --) + { + work = * q; + * q = carry; + carry = work; + } + } } - } - } - else - { - P --; - } - product -> leader = product -> low + P; - product -> exponent = exponent; + else + { + P --; + } + product -> leader = product -> low + P; + product -> exponent = exponent; } /* end: flonum_multip.c */ |