Mercurial > hg > octave-lojdl > gnulib-hg
changeset 16702:20f853305332
fmal: Avoid test failure on OpenBSD 5.1/SPARC64.
* lib/fma.c (VOLATILE): New macro.
(FUNC): Use it to work around a GCC compiler bug.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Thu, 15 Mar 2012 12:12:49 +0100 |
| parents | e8b78d510c66 |
| children | bc4a5286c4ff |
| files | ChangeLog lib/fma.c |
| diffstat | 2 files changed, 25 insertions(+), 6 deletions(-) [+] |
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--- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2012-03-15 Bruno Haible <bruno@clisp.org> + + fmal: Avoid test failure on OpenBSD 5.1/SPARC64. + * lib/fma.c (VOLATILE): New macro. + (FUNC): Use it to work around a GCC compiler bug. + 2012-03-13 Bruno Haible <bruno@clisp.org> hypotl: Bypass broken implementation in OpenBSD 5.1/SPARC.
--- a/lib/fma.c +++ b/lib/fma.c @@ -72,6 +72,13 @@ # pragma fenv_access (off) #endif +/* Work around GCC 4.2.1 bug on OpenBSD 5.1/SPARC64. */ +#if defined __GNUC__ && defined __sparc__ +# define VOLATILE volatile +#else +# define VOLATILE +#endif + /* It is possible to write an implementation of fused multiply-add with floating-point operations alone. See Sylvie Boldo, Guillaume Melquiond: @@ -866,16 +873,22 @@ else { /* First loop round. */ - fsum = (DOUBLE) - ((sum[sum_len - k - 1] << (GMP_LIMB_BITS - shift)) - | (sum_len >= k + 2 ? sum[sum_len - k - 2] >> shift : 0)); + { + VOLATILE mp_limb_t chunk = + (sum[sum_len - k - 1] << (GMP_LIMB_BITS - shift)) + | (sum_len >= k + 2 ? sum[sum_len - k - 2] >> shift : 0); + fsum = (DOUBLE) chunk; + } /* General loop. */ while (--k >= 0) { fsum *= chunk_multiplier; - fsum += (DOUBLE) - ((sum[sum_len - k - 1] << (GMP_LIMB_BITS - shift)) - | (sum[sum_len - k - 2] >> shift)); + { + VOLATILE mp_limb_t chunk = + (sum[sum_len - k - 1] << (GMP_LIMB_BITS - shift)) + | (sum[sum_len - k - 2] >> shift); + fsum += (DOUBLE) chunk; + } } } }