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| author | David Miller <davem@davemloft.net> | 2012-02-02 00:17:55 +0200 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2012-02-02 10:34:25 +1100 |
| commit | a99e7e5f36c55e561a64280f5099078c31839076 (patch) | |
| tree | 01c1bc431834e465ee0ae2585ea4f5a0a7442cf4 /lib/mpi | |
| parent | c6df4b17c8539f737a6a2d7b797eac41e8e34cdc (diff) | |
| download | lwn-a99e7e5f36c55e561a64280f5099078c31839076.tar.gz lwn-a99e7e5f36c55e561a64280f5099078c31839076.zip | |
lib: Fix 32-bit sparc udiv_qrnnd() definition in mpilib's longlong.h
This copy of longlong.h is extremely dated and results in compile
errors on sparc32 when MPILIB is enabled, copy over the more uptodate
implementation from arch/sparc/math/sfp-util_32.h
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'lib/mpi')
| -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 b87487b40a8b..29f98624ef93 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__ */ /*************************************** |