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authorJoseph Myers <joseph@codesourcery.com>2017-10-18 17:37:18 +0000
committerJoseph Myers <joseph@codesourcery.com>2017-10-18 17:37:18 +0000
commit81325b12b14c44887f1633a2c180a413afc2b504 (patch)
tree090f597a1b4997ad177ce581b39edcacd930f334 /sysdeps/ieee754/ldbl-opt
parenta68ba2f3cd3cbe32c1f31e13c20ed13487727b32 (diff)
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Add _Float128 function aliases.
This patch adds support for *f128 function aliases on platforms where long double has the binary128 format (and thus GCC 7 provides the _Float128 type with the same ABI as long double but as a distinct type in terms of C type compatibility). This is the same API as provided in glibc 2.26 for powerpc64le / x86_64 / x86 / ia64 where _Float128 has a different format from long double, with the bulk of the API coming from TS 18661-3. All the functions alias the corresponding long double functions, and __* function names are not provided since those are only needed once for each floating-point format, not more than once for different types with the same format (so for example, -ffinite-math-only maps foof128 to __fool_finite, while type-generic macros end up calling e.g. __issignalingl for _Float128 arguments on such platforms). The preparation for this feature was done in previous patches, so this one just needs to add the relevant makefile and header definitions, and update macro definitions of libm_alias_ldouble_other_r, to turn on the feature, and update documentation and ABI baselines. Tested (a) for x86_64, (b) for aarch64, (c) with build-many-glibcs.py with both GCC 6 and GCC 7. * sysdeps/ieee754/ldbl-128/Makeconfig: New file. * sysdeps/ieee754/ldbl-128/bits/floatn.h: Likewise. * sysdeps/ieee754/ldbl-128/float128-abi.h: Likewise. * sysdeps/generic/libm-alias-ldouble.h: Include <bits/floatn.h>. [__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (libm_alias_ldouble_other_r): Also create _Float128 alias. * sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h: Include <bits/floatn.h>. [__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (libm_alias_ldouble_other_r): Also create _Float128 alias. * manual/math.texi (Mathematics): Document additional architecture support for _Float128. * sysdeps/unix/sysv/linux/aarch64/libc.abilist: Update. * sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
Diffstat (limited to 'sysdeps/ieee754/ldbl-opt')
-rw-r--r--sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h b/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h
index 291a5f5..ad31f69 100644
--- a/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h
+++ b/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h
@@ -19,6 +19,7 @@
#ifndef _LIBM_ALIAS_LDOUBLE_H
#define _LIBM_ALIAS_LDOUBLE_H
+#include <bits/floatn.h>
#include <math_ldbl_opt.h>
#include <ldbl-compat-choose.h>
@@ -26,7 +27,12 @@
that has internal name FROM ## l ## R and public names TO ## suffix
## R for each suffix of a supported _FloatN / _FloatNx
floating-point type with the same format as long double. */
-#define libm_alias_ldouble_other_r(from, to, r)
+#if __HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128
+# define libm_alias_ldouble_other_r(from, to, r) \
+ weak_alias (from ## l ## r, to ## f128 ## r)
+#else
+# define libm_alias_ldouble_other_r(from, to, r)
+#endif
/* Likewise, but without the R suffix. */
#define libm_alias_ldouble_other(from, to) \