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author | Joseph Myers <joseph@codesourcery.com> | 2021-09-15 22:57:35 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2021-09-15 22:57:35 +0000 |
commit | 4b6574a6f63b6c766f27be4a0b4c9376a35a4bd5 (patch) | |
tree | ba1ed4258b6617f7fbde8ef9a0665fdf859cb955 /sysdeps/ieee754 | |
parent | 5604830dea207bbd5fd5dbe087cc7ca30b527bb5 (diff) | |
download | glibc-4b6574a6f63b6c766f27be4a0b4c9376a35a4bd5.zip glibc-4b6574a6f63b6c766f27be4a0b4c9376a35a4bd5.tar.gz glibc-4b6574a6f63b6c766f27be4a0b4c9376a35a4bd5.tar.bz2 |
Redirect fma calls to __fma in libm
include/math.h has a mechanism to redirect internal calls to various
libm functions, that can often be inlined by the compiler, to call
non-exported __* names for those functions in the case when the calls
aren't inlined, with the redirection being disabled when
NO_MATH_REDIRECT. Add fma to the functions to which this mechanism is
applied.
At present, libm-internal fma calls (generally to __builtin_fma*
functions) are only done when it's known the call will be inlined,
with alternative code not relying on an fma operation being used in
the caller otherwise. This patch is in preparation for adding the TS
18661 / C2X narrowing fma functions to glibc; it will be natural for
the narrowing function implementations to call the underlying fma
functions unconditionally, with this either being inlined or resulting
in an __fma* call. (Using two levels of round-to-odd computation like
that, in the case where there isn't an fma hardware instruction, isn't
optimal but is certainly a lot simpler for the initial implementation
than writing different narrowing fma implementations for all the
various pairs of formats.)
Tested with build-many-glibcs.py that installed stripped shared
libraries are unchanged by the patch (using
<https://sourceware.org/pipermail/libc-alpha/2021-September/130991.html>
to fix installed library stripping in build-many-glibcs.py). Also
tested for x86_64.
Diffstat (limited to 'sysdeps/ieee754')
-rw-r--r-- | sysdeps/ieee754/dbl-64/s_fma.c | 1 | ||||
-rw-r--r-- | sysdeps/ieee754/dbl-64/s_fmaf.c | 1 | ||||
-rw-r--r-- | sysdeps/ieee754/float128/s_fmaf128.c | 1 | ||||
-rw-r--r-- | sysdeps/ieee754/ldbl-128/s_fma.c | 1 | ||||
-rw-r--r-- | sysdeps/ieee754/ldbl-128/s_fmal.c | 1 | ||||
-rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_fmal.c | 1 | ||||
-rw-r--r-- | sysdeps/ieee754/ldbl-96/s_fma.c | 1 | ||||
-rw-r--r-- | sysdeps/ieee754/ldbl-96/s_fmal.c | 1 | ||||
-rw-r--r-- | sysdeps/ieee754/soft-fp/s_fma.c | 1 | ||||
-rw-r--r-- | sysdeps/ieee754/soft-fp/s_fmaf.c | 1 | ||||
-rw-r--r-- | sysdeps/ieee754/soft-fp/s_fmal.c | 1 |
11 files changed, 11 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_fma.c b/sysdeps/ieee754/dbl-64/s_fma.c index 55ccf46..aa43363 100644 --- a/sysdeps/ieee754/dbl-64/s_fma.c +++ b/sysdeps/ieee754/dbl-64/s_fma.c @@ -16,6 +16,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#define NO_MATH_REDIRECT #include <float.h> #include <math.h> #include <fenv.h> diff --git a/sysdeps/ieee754/dbl-64/s_fmaf.c b/sysdeps/ieee754/dbl-64/s_fmaf.c index 2b4da8b..2eb9a50 100644 --- a/sysdeps/ieee754/dbl-64/s_fmaf.c +++ b/sysdeps/ieee754/dbl-64/s_fmaf.c @@ -16,6 +16,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#define NO_MATH_REDIRECT #include <math.h> #include <fenv.h> #include <ieee754.h> diff --git a/sysdeps/ieee754/float128/s_fmaf128.c b/sysdeps/ieee754/float128/s_fmaf128.c index 6497895..a900af6 100644 --- a/sysdeps/ieee754/float128/s_fmaf128.c +++ b/sysdeps/ieee754/float128/s_fmaf128.c @@ -1,2 +1,3 @@ +#define NO_MATH_REDIRECT #include <float128_private.h> #include "../ldbl-128/s_fmal.c" diff --git a/sysdeps/ieee754/ldbl-128/s_fma.c b/sysdeps/ieee754/ldbl-128/s_fma.c index 47673da..4795e71 100644 --- a/sysdeps/ieee754/ldbl-128/s_fma.c +++ b/sysdeps/ieee754/ldbl-128/s_fma.c @@ -16,6 +16,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#define NO_MATH_REDIRECT #include <math.h> #include <fenv.h> #include <ieee754.h> diff --git a/sysdeps/ieee754/ldbl-128/s_fmal.c b/sysdeps/ieee754/ldbl-128/s_fmal.c index 0f5f5f1..aff9efc 100644 --- a/sysdeps/ieee754/ldbl-128/s_fmal.c +++ b/sysdeps/ieee754/ldbl-128/s_fmal.c @@ -16,6 +16,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#define NO_MATH_REDIRECT #include <float.h> #include <math.h> #include <fenv.h> diff --git a/sysdeps/ieee754/ldbl-128ibm/s_fmal.c b/sysdeps/ieee754/ldbl-128ibm/s_fmal.c index f1b36c4..a989f4c 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_fmal.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_fmal.c @@ -16,6 +16,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#define NO_MATH_REDIRECT #include <fenv.h> #include <float.h> #include <math.h> diff --git a/sysdeps/ieee754/ldbl-96/s_fma.c b/sysdeps/ieee754/ldbl-96/s_fma.c index 8ad7e4d..417c27e 100644 --- a/sysdeps/ieee754/ldbl-96/s_fma.c +++ b/sysdeps/ieee754/ldbl-96/s_fma.c @@ -16,6 +16,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#define NO_MATH_REDIRECT #include <float.h> #include <math.h> #include <fenv.h> diff --git a/sysdeps/ieee754/ldbl-96/s_fmal.c b/sysdeps/ieee754/ldbl-96/s_fmal.c index fad8450..cd83df4 100644 --- a/sysdeps/ieee754/ldbl-96/s_fmal.c +++ b/sysdeps/ieee754/ldbl-96/s_fmal.c @@ -16,6 +16,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#define NO_MATH_REDIRECT #include <float.h> #include <math.h> #include <fenv.h> diff --git a/sysdeps/ieee754/soft-fp/s_fma.c b/sysdeps/ieee754/soft-fp/s_fma.c index 9fd8ddb..4b0d6b5 100644 --- a/sysdeps/ieee754/soft-fp/s_fma.c +++ b/sysdeps/ieee754/soft-fp/s_fma.c @@ -25,6 +25,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#define NO_MATH_REDIRECT #include <math.h> #include <libc-diag.h> #include <libm-alias-double.h> diff --git a/sysdeps/ieee754/soft-fp/s_fmaf.c b/sysdeps/ieee754/soft-fp/s_fmaf.c index 2abb8c7..bed5990 100644 --- a/sysdeps/ieee754/soft-fp/s_fmaf.c +++ b/sysdeps/ieee754/soft-fp/s_fmaf.c @@ -25,6 +25,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#define NO_MATH_REDIRECT #include <math.h> #include <libc-diag.h> #include <libm-alias-float.h> diff --git a/sysdeps/ieee754/soft-fp/s_fmal.c b/sysdeps/ieee754/soft-fp/s_fmal.c index 0a364f4..aecec13 100644 --- a/sysdeps/ieee754/soft-fp/s_fmal.c +++ b/sysdeps/ieee754/soft-fp/s_fmal.c @@ -25,6 +25,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#define NO_MATH_REDIRECT #include <math.h> #include <libc-diag.h> #include <libm-alias-ldouble.h> |