Mercurial > gnulib
changeset 29212:e5d57ef58316
Detect pseudo-denormals on x86 even when cross-compiling.
* lib/isnan.c (rpl_isnanl) [!KNOWN_EXPBIT0_LOCATION
&& USE_LONG_DOUBLE && x86]: Add one more check to filter out
invalid bit patterns that happen to satisfy ==.
Signed-off-by: Eric Blake <ebb9@byu.net>
| author | Eric Blake <ebb9@byu.net> |
|---|---|
| date | Tue, 11 Dec 2007 11:35:55 -0700 |
| parents | f82e2b0c88c3 |
| children | 8e137bc72061 |
| files | ChangeLog lib/isnan.c |
| diffstat | 2 files changed, 18 insertions(+), 1 deletions(-) [+] |
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--- a/ChangeLog Mon Dec 10 09:54:54 2007 -0700 +++ b/ChangeLog Tue Dec 11 11:35:55 2007 -0700 @@ -1,5 +1,10 @@ 2007-12-11 Eric Blake <ebb9@byu.net> + Detect pseudo-denormals on x86 even when cross-compiling. + * lib/isnan.c (rpl_isnanl) [!KNOWN_EXPBIT0_LOCATION + && USE_LONG_DOUBLE && x86]: Add one more check to filter out + invalid bit patterns that happen to satisfy ==. + Avoid link failures with separate libtests.a. * gnulib-tool (func_emit_tests_Makefile_am): Also list local_ldadd last, to satisfy circular dependencies.
--- a/lib/isnan.c Mon Dec 10 09:54:54 2007 -0700 +++ b/lib/isnan.c Tue Dec 11 11:35:55 2007 -0700 @@ -140,7 +140,19 @@ /* The configuration did not find sufficient information. Give up about the signaling NaNs, handle only the quiet NaNs. */ if (x == x) - return 0; + { +# if defined USE_LONG_DOUBLE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) + /* Detect any special bit patterns that pass ==; see comment above. */ + memory_double m1; + memory_double m2; + + m1.value = x; + m2.value = x + 0; + if (memcmp (&m1.value, &m2.value, SIZE) != 0) + return 1; +# endif + return 0; + } else return 1; #endif