[libc] [llvm] [libc][math] Refactor f16fmaf128 to Header Only (PR #177850)

LLVM Continuous Integration via llvm-commits llvm-commits at lists.llvm.org
Thu Feb 5 07:50:53 PST 2026 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `libc-x86_64-debian-dbg` running on `libc-x86_64-debian` while building `libc,utils` at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/93/builds/38503

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 4 (annotate) failure: 'python ../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py ...' (failure)
...
[ RUN      ] LlvmLibcStrFromfTest.ImproperFormatString
[       OK ] LlvmLibcStrFromfTest.ImproperFormatString (7 us)
[ RUN      ] LlvmLibcStrFromfTest.InsufficientBufferSize
[       OK ] LlvmLibcStrFromfTest.InsufficientBufferSize (55 us)
[ RUN      ] LlvmLibcStrFromfTest.InfAndNanValues
[       OK ] LlvmLibcStrFromfTest.InfAndNanValues (1 us)
[ RUN      ] LlvmLibcStrFromfTest.CharsWrittenOverflow
[       OK ] LlvmLibcStrFromfTest.CharsWrittenOverflow (1086 ms)
Ran 8 tests.  PASS: 8  FAIL: 0
[1273/1284] Building CXX object libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_FMA_OPT.__build__.dir/shared_math_test.cpp.o
FAILED: libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_FMA_OPT.__build__.dir/shared_math_test.cpp.o 
/usr/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_20_0_0_git -D_DEBUG -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/build/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/build/libc/include -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -msse4.2 -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_COPT_STRING_LENGTH_IMPL=clang_vector -DLIBC_COPT_FIND_FIRST_CHARACTER_IMPL=word -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -DLIBC_THREAD_MODE=LIBC_THREAD_MODE_PLATFORM -DLIBC_CONF_WCTYPE_MODE=LIBC_WCTYPE_MODE_ASCII -DLIBC_COPT_RAW_MUTEX_DEFAULT_SPIN_COUNT=100 -fpie -Wall -Wextra -Wconversion -Wno-sign-conversion -Wimplicit-fallthrough -Wwrite-strings -Wno-c99-extensions -Wno-gnu-imaginary-constant -Wno-pedantic -Wstrict-prototypes -Wextra-semi -Wnewline-eof -Wnonportable-system-include-path -Wthread-safety -DLIBC_TEST=UNIT -std=gnu++17 -MD -MT libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_FMA_OPT.__build__.dir/shared_math_test.cpp.o -MF libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_FMA_OPT.__build__.dir/shared_math_test.cpp.o.d -o libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_FMA_OPT.__build__.dir/shared_math_test.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/test/shared/shared_math_test.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/test/shared/shared_math_test.cpp:9:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/shared/math.h:63:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/shared/math/f16fmaf128.h:23:13: error: no member named 'f16fmaf128' in namespace '__llvm_libc_20_0_0_git::math'; did you mean 'dfmaf128'?
using math::f16fmaf128;
      ~~~~~~^~~~~~~~~~
            dfmaf128
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/src/__support/math/dfmaf128.h:23:20: note: 'dfmaf128' declared here
LIBC_INLINE double dfmaf128(float128 x, float128 y, float128 z) {
                   ^
1 error generated.
[1274/1284] Building CXX object libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_ROUND_OPT.__build__.dir/shared_math_test.cpp.o
FAILED: libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_ROUND_OPT.__build__.dir/shared_math_test.cpp.o 
/usr/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_20_0_0_git -D_DEBUG -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/build/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/build/libc/include -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -mavx2 -mfma -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_COPT_STRING_LENGTH_IMPL=clang_vector -DLIBC_COPT_FIND_FIRST_CHARACTER_IMPL=word -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -DLIBC_THREAD_MODE=LIBC_THREAD_MODE_PLATFORM -DLIBC_CONF_WCTYPE_MODE=LIBC_WCTYPE_MODE_ASCII -DLIBC_COPT_RAW_MUTEX_DEFAULT_SPIN_COUNT=100 -fpie -Wall -Wextra -Wconversion -Wno-sign-conversion -Wimplicit-fallthrough -Wwrite-strings -Wno-c99-extensions -Wno-gnu-imaginary-constant -Wno-pedantic -Wstrict-prototypes -Wextra-semi -Wnewline-eof -Wnonportable-system-include-path -Wthread-safety -DLIBC_TEST=UNIT -std=gnu++17 -MD -MT libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_ROUND_OPT.__build__.dir/shared_math_test.cpp.o -MF libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_ROUND_OPT.__build__.dir/shared_math_test.cpp.o.d -o libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_ROUND_OPT.__build__.dir/shared_math_test.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/test/shared/shared_math_test.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/test/shared/shared_math_test.cpp:9:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/shared/math.h:63:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/shared/math/f16fmaf128.h:23:13: error: no member named 'f16fmaf128' in namespace '__llvm_libc_20_0_0_git::math'; did you mean 'dfmaf128'?
using math::f16fmaf128;
      ~~~~~~^~~~~~~~~~
            dfmaf128
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/src/__support/math/dfmaf128.h:23:20: note: 'dfmaf128' declared here
LIBC_INLINE double dfmaf128(float128 x, float128 y, float128 z) {
                   ^
1 error generated.
[1275/1284] Building CXX object libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__build__.dir/shared_math_test.cpp.o
FAILED: libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__build__.dir/shared_math_test.cpp.o 
/usr/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_20_0_0_git -D_DEBUG -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/build/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/build/libc/include -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -mavx2 -mfma -msse4.2 -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_COPT_STRING_LENGTH_IMPL=clang_vector -DLIBC_COPT_FIND_FIRST_CHARACTER_IMPL=word -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -DLIBC_THREAD_MODE=LIBC_THREAD_MODE_PLATFORM -DLIBC_CONF_WCTYPE_MODE=LIBC_WCTYPE_MODE_ASCII -DLIBC_COPT_RAW_MUTEX_DEFAULT_SPIN_COUNT=100 -fpie -Wall -Wextra -Wconversion -Wno-sign-conversion -Wimplicit-fallthrough -Wwrite-strings -Wno-c99-extensions -Wno-gnu-imaginary-constant -Wno-pedantic -Wstrict-prototypes -Wextra-semi -Wnewline-eof -Wnonportable-system-include-path -Wthread-safety -DLIBC_TEST=UNIT -std=gnu++17 -MD -MT libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__build__.dir/shared_math_test.cpp.o -MF libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__build__.dir/shared_math_test.cpp.o.d -o libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__build__.dir/shared_math_test.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/test/shared/shared_math_test.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/test/shared/shared_math_test.cpp:9:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/shared/math.h:63:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/shared/math/f16fmaf128.h:23:13: error: no member named 'f16fmaf128' in namespace '__llvm_libc_20_0_0_git::math'; did you mean 'dfmaf128'?
using math::f16fmaf128;
      ~~~~~~^~~~~~~~~~
            dfmaf128
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/llvm-project/libc/src/__support/math/dfmaf128.h:23:20: note: 'dfmaf128' declared here
LIBC_INLINE double dfmaf128(float128 x, float128 y, float128 z) {
                   ^
1 error generated.
[1276/1284] Building CXX object libc/test/shared/CMakeFiles/libc.test.shared.shared_math_test.__unit__.__NO_FMA_OPT.__NO_ROUND_OPT.__build__.dir/shared_math_test.cpp.o

```

</details>

https://github.com/llvm/llvm-project/pull/177850

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