diff options
Diffstat (limited to 'stdlib')
| -rw-r--r-- | stdlib/longlong.h | 39 |
1 files changed, 33 insertions, 6 deletions
diff --git a/stdlib/longlong.h b/stdlib/longlong.h index 197aac41da..4e41ac4a25 100644 --- a/stdlib/longlong.h +++ b/stdlib/longlong.h @@ -1,5 +1,5 @@ /* longlong.h -- definitions for mixed size 32/64 bit arithmetic. - Copyright (C) 1991, 92, 93, 94, 96, 97 Free Software Foundation, Inc. + Copyright (C) 1991, 92, 93, 94, 96, 97, 98 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -1135,12 +1135,39 @@ extern USItype __udiv_qrnnd (); #define UMUL_TIME 39 /* 39 instructions */ #endif #ifndef udiv_qrnnd -#ifndef LONGLONG_STANDALONE +/* It's quite necessary to add this much assembler for the sparc. + The default udiv_qrnnd (in C) is more than 10 times slower! */ #define udiv_qrnnd(q, r, n1, n0, d) \ - do { USItype __r; \ - (q) = __udiv_qrnnd (&__r, (n1), (n0), (d)); \ - (r) = __r; \ - } while (0) + __asm__ ("! Inlined udiv_qrnnd + mov 32,%%g1 + subcc %1,%2,%%g0 +1: bcs 5f + addxcc %0,%0,%0 ! shift n1n0 and a q-bit in lsb + sub %1,%2,%1 ! this kills msb of n + addx %1,%1,%1 ! so this can't give carry + subcc %%g1,1,%%g1 +2: bne 1b + subcc %1,%2,%%g0 + bcs 3f + addxcc %0,%0,%0 ! shift n1n0 and a q-bit in lsb + b 3f + sub %1,%2,%1 ! this kills msb of n +4: sub %1,%2,%1 +5: addxcc %1,%1,%1 + bcc 2b + subcc %%g1,1,%%g1 +! Got carry from n. Subtract next step to cancel this carry. + bne 4b + addcc %0,%0,%0 ! shift n1n0 and a 0-bit in lsb + sub %1,%2,%1 +3: xnor %0,0,%0 + ! End of inline udiv_qrnnd" \ + : "=&r" ((USItype)(q)), \ + "=&r" ((USItype)(r)) \ + : "r" ((USItype)(d)), \ + "1" ((USItype)(n1)), \ + "0" ((USItype)(n0)) : "%g1" __AND_CLOBBER_CC) +#define UDIV_TIME (3+7*32) /* 7 instructions/iteration. 32 iterations. */ extern USItype __udiv_qrnnd __P ((USItype *, USItype, USItype, USItype)); #define UDIV_TIME 140 #endif /* LONGLONG_STANDALONE */ |