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authorGabriel F. T. Gomes <gabriel@inconstante.eti.br>2018-06-10 22:42:34 -0300
committerGabriel F. T. Gomes <gabriel@inconstante.eti.br>2018-12-07 17:28:26 -0200
commit10446f5d9f2cf4d91c8ae483fd2b5470242ae2a1 (patch)
tree68e631fca5b65a44e28f5b3791ff2e9b8fc56a25 /libio
parent45f33aac78e86d0f23c74a207295f3c7a77a94c0 (diff)
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Prepare vfscanf to use __strtof128_internal
On powerpc64le, long double can currently take two formats: the same as double (-mlong-double-64) or IBM Extended Precision (default with -mlong-double-128 or explicitly with -mabi=ibmlongdouble). The internal implementation of scanf-like functions is aware of these possibilites and, based on the format in use, properly calls __strtold_internal or __strtod_internal, saving the return to a variable of type double or long double. When library support for TS 18661-3 was added to glibc, a new function, __strtof128_internal, was added to enable reading of floating-point values with IEEE binary128 format into the _Float128 type. Now that powerpc64le is getting support for its third long double format, and taking into account that this format is the same as the format of _Float128, this patch extends __vfscanf_internal and __vfwscanf_internal to call __strtof128_internal or __wcstof128_internal when appropriate. The result gets saved into a variable of _Float128 type. Tested for powerpc64le.
Diffstat (limited to 'libio')
-rw-r--r--libio/libioP.h18
1 files changed, 15 insertions, 3 deletions
diff --git a/libio/libioP.h b/libio/libioP.h
index ce5228e..958ef9b 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -759,9 +759,21 @@ extern off64_t _IO_seekpos_unlocked (FILE *, off64_t, int)
allocation for input strings with %as, %aS and %a[, a GNU extension,
is disabled. This is the behavior that the __isoc99_scanf family of
functions use. When the flag is set to zero, automatic allocation is
- enabled. */
-#define SCANF_LDBL_IS_DBL 0x0001
-#define SCANF_ISOC99_A 0x0002
+ enabled.
+
+ SCANF_LDBL_USES_FLOAT128 is used on platforms where the long double
+ format used to be different from the IEC 60559 double format *and*
+ also different from the Quadruple 128-bits IEC 60559 format (such as
+ the IBM Extended Precision format on powerpc or the 80-bits IEC 60559
+ format on x86), but was later converted to the Quadruple 128-bits IEC
+ 60559 format, which is the same format that the _Float128 always has
+ (hence the `USES_FLOAT128' suffix in the name of the flag). When set
+ to one, this macros indicates that long double values are to be
+ handled as having this new format. Otherwise, they should be handled
+ as the previous format on that platform. */
+#define SCANF_LDBL_IS_DBL 0x0001
+#define SCANF_ISOC99_A 0x0002
+#define SCANF_LDBL_USES_FLOAT128 0x0004
extern int __vfscanf_internal (FILE *fp, const char *format, va_list argp,
unsigned int flags)