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| author | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2012-02-24 00:47:05 +0000 |
|---|---|---|
| committer | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2012-02-24 00:47:05 +0000 |
| commit | 8aaaaf3cbfb96a9f74c5775c71067a9290244ec7 (patch) | |
| tree | 67349c6a69740150b67c4c39de49cde9b3648aa5 /lib/mpi/longlong.h | |
| parent | 94f61a7666224ab307e387ff0d146055ae77e6ab (diff) | |
| parent | e29206381a1436e0f47c0f5b9a23159a03c57715 (diff) | |
| download | op-kernel-dev-8aaaaf3cbfb96a9f74c5775c71067a9290244ec7.zip op-kernel-dev-8aaaaf3cbfb96a9f74c5775c71067a9290244ec7.tar.gz | |
Merge branch 'fbdev-for-linus' into fbdev-next
Diffstat (limited to 'lib/mpi/longlong.h')
| -rw-r--r-- | lib/mpi/longlong.h | 44 |
1 files changed, 33 insertions, 11 deletions
diff --git a/lib/mpi/longlong.h b/lib/mpi/longlong.h index b87487b..29f9862 100644 --- a/lib/mpi/longlong.h +++ b/lib/mpi/longlong.h @@ -1200,18 +1200,40 @@ do { \ "r" ((USItype)(v)) \ : "%g1", "%g2" __AND_CLOBBER_CC) #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) - extern USItype __udiv_qrnnd(); -#define UDIV_TIME 140 -#endif /* LONGLONG_STANDALONE */ -#endif /* udiv_qrnnd */ + __asm__ ("! Inlined udiv_qrnnd\n\t" \ + "mov 32,%%g1\n\t" \ + "subcc %1,%2,%%g0\n\t" \ + "1: bcs 5f\n\t" \ + "addxcc %0,%0,%0 ! shift n1n0 and a q-bit in lsb\n\t" \ + "sub %1,%2,%1 ! this kills msb of n\n\t" \ + "addx %1,%1,%1 ! so this can't give carry\n\t" \ + "subcc %%g1,1,%%g1\n\t" \ + "2: bne 1b\n\t" \ + "subcc %1,%2,%%g0\n\t" \ + "bcs 3f\n\t" \ + "addxcc %0,%0,%0 ! shift n1n0 and a q-bit in lsb\n\t" \ + "b 3f\n\t" \ + "sub %1,%2,%1 ! this kills msb of n\n\t" \ + "4: sub %1,%2,%1\n\t" \ + "5: addxcc %1,%1,%1\n\t" \ + "bcc 2b\n\t" \ + "subcc %%g1,1,%%g1\n\t" \ + "! Got carry from n. Subtract next step to cancel this carry.\n\t" \ + "bne 4b\n\t" \ + "addcc %0,%0,%0 ! shift n1n0 and a 0-bit in lsb\n\t" \ + "sub %1,%2,%1\n\t" \ + "3: xnor %0,0,%0\n\t" \ + "! End of inline udiv_qrnnd\n" \ + : "=&r" ((USItype)(q)), \ + "=&r" ((USItype)(r)) \ + : "r" ((USItype)(d)), \ + "1" ((USItype)(n1)), \ + "0" ((USItype)(n0)) : "%g1", "cc") +#define UDIV_TIME (3+7*32) /* 7 instructions/iteration. 32 iterations. */ +#endif #endif /* __sparc__ */ /*************************************** |
