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* powerpc64: Add the clone3 wrapperAdhemerval Zanella Netto2023-02-092-0/+158
| | | | | | | | | | | | | | | | It follows the internal signature: extern int clone3 (struct clone_args *__cl_args, size_t __size, int (*__func) (void *__arg), void *__arg); The powerpc64 ABI requires an initial stackframe so the child can store/restore the TOC. It is create prior calling clone3 by adjusting the stack size (since kernel will compute the stack as stack plus size). Checked on powerpc64-linux-gnu (power8, kernel 6.0) and powerpc64le-linux-gnu (power9, kernel 4.18). Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com>
* string: Add libc_hidden_proto for memrchrAdhemerval Zanella2023-02-0813-18/+43
| | | | | | | Although static linker can optimize it to local call, it follows the internal scheme to provide hidden proto and definitions. Reviewed-by: Carlos Eduardo Seo <carlos.seo@linaro.org>
* string: Add libc_hidden_proto for strchrnulAdhemerval Zanella2023-02-0810-12/+33
| | | | | | | Although static linker can optimize it to local call, it follows the internal scheme to provide hidden proto and definitions. Reviewed-by: Carlos Eduardo Seo <carlos.seo@linaro.org>
* C-SKY: Strip hard float abi from hard float feature.quxm2023-02-073-42/+64
| | | | | | | | | | | | | | | | | | | The hard float abi and hard float are different, Hard float abi: Use float register to pass float type arguments. Hard float: Enable the hard float ISA feature. So the with_fp_cond cannot represent these two features. When -mfloat-abi=softfp, the float abi is soft and hard float is enabled. So add 'with_hard_float_abi' in preconfigure and define 'CSKY_HARD_FLOAT_ABI' if float abi is hard, and use 'CSKY_HARD_FLOAT_ABI' to determine dynamic linker because it is what determines compatibility. And with_fp_cond is still needed to tell glibc whether to enable hard floating feature. In addition, use AC_TRY_COMMAND to test gcc to ensure compatibility between different versions of gcc. The original way has a problem that __CSKY_HARD_FLOAT_FPU_SF__ means the target only has single hard float-points ISA, so it's not defined in CPUs like ck810f. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* S390: Influence hwcaps/stfle via GLIBC_TUNABLES.Stefan Liebler2023-02-0711-63/+418
| | | | | | | | | | | | | | | | | | | | | | | | | | | This patch enables the option to influence hwcaps and stfle bits used by the s390 specific ifunc-resolvers. The currently x86-specific tunable glibc.cpu.hwcaps is also used on s390x to achieve the task. In addition the user can also set a CPU arch-level like z13 instead of single HWCAP and STFLE features. Note that the tunable only handles the features which are really used in the IFUNC-resolvers. All others are ignored as the values are only used inside glibc. Thus we can influence: - HWCAP_S390_VXRS (z13) - HWCAP_S390_VXRS_EXT (z14) - HWCAP_S390_VXRS_EXT2 (z15) - STFLE_MIE3 (z15) The influenced hwcap/stfle-bits are stored in the s390-specific cpu_features struct which also contains reserved fields for future usage. The ifunc-resolvers and users of stfle bits are adjusted to use the information from cpu_features struct. On 31bit, the ELF_MACHINE_IRELATIVE macro is now also defined. Otherwise the new ifunc-resolvers segfaults as they depend on the not yet processed_rtld_global_ro@GLIBC_PRIVATE relocation.
* riscv: Add string-fza.h and string-fzi.hAdhemerval Zanella2023-02-062-0/+146
| | | | | | | | | | It uses the bitmanip extension to optimize index_fist and index_last with clz/ctz (using generic implementation that routes to compiler builtin) and orc.b to check null bytes. Checked the string test on riscv64 user mode. Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
* sh: Add string-fzb.hAdhemerval Zanella2023-02-061-0/+55
| | | | | | Use the SH cmp/str on has_{zero,eq,zero_eq}. Checked on sh4-linux-gnu.
* powerpc: Add string-fza.hRichard Henderson2023-02-061-0/+71
| | | | | | | | | | | While ppc has the more important string functions in assembly, there are still a few generic routines used. Use the Power 6 CMPB insn for testing of zeros. Checked on powerpc64le-linux-gnu. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* arm: Add string-fza.hRichard Henderson2023-02-061-0/+67
| | | | | | | | | | | While arm has the more important string functions in assembly, there are still a few generic routines used. Use the UQSUB8 insn for testing of zeros. Checked on armv7-linux-gnueabihf Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* alpha: Add string-fza, string-fzb.h, string-fzi.h, and string-shift.hRichard Henderson2023-02-064-0/+218
| | | | | | | | | | | | | While alpha has the more important string functions in assembly, there are still a few for find the generic routines are used. Use the CMPBGE insn, via the builtin, for testing of zeros. Use a simplified expansion of __builtin_ctz when the insn isn't available. Checked on alpha-linux-gnu. Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* hppa: Add string-fza.h, string-fzc.h, and string-fzi.hRichard Henderson2023-02-063-0/+250
| | | | | | | | | | | | | Use UXOR,SBZ to test for a zero byte within a word. While we can get semi-decent code out of asm-goto, we would do slightly better with a compiler builtin. For index_zero et al, sequential testing of bytes is less expensive than any tricks that involve a count-leading-zeros insn that we don't have. Checked on hppa-linux-gnu. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* hppa: Add memcopy.hRichard Henderson2023-02-061-0/+42
| | | | | | | | | | | | | | | GCC's combine pass cannot merge (x >> c | y << (32 - c)) into a double-word shift unless (1) the subtract is in the same basic block and (2) the result of the subtract is used exactly once. Neither condition is true for any use of MERGE. By forcing the use of a double-word shift, we not only reduce contention on SAR, but also allow the setting of SAR to be hoisted outside of a loop. Checked on hppa-linux-gnu. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* string: Improve generic strnlen with memchrAdhemerval Zanella2023-02-063-20/+22
| | | | | | | | It also cleanups the multiple inclusion by leaving the ifunc implementation to undef the weak_alias and libc_hidden_def. Co-authored-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
* string: Improve generic memchrAdhemerval Zanella2023-02-062-18/+5
| | | | | | | | | | | | | | | | | New algorithm read the first aligned address and mask off the unwanted bytes (this strategy is similar to arch-specific implementations used on powerpc, sparc, and sh). The loop now read word-aligned address and check using the has_eq macro. Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc-linux-gnu, and powerpc64-linux-gnu by removing the arch-specific assembly implementation and disabling multi-arch (it covers both LE and BE for 64 and 32 bits). Co-authored-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
* string: Improve generic strchrAdhemerval Zanella2023-02-061-5/+6
| | | | | | | | | | | | New algorithm now calls strchrnul. Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc-linux-gnu, and powerpc64-linux-gnu by removing the arch-specific assembly implementation and disabling multi-arch (it covers both LE and BE for 64 and 32 bits). Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
* string: Improve generic strchrnulAdhemerval Zanella2023-02-062-6/+0
| | | | | | | | | | | | | | | | | New algorithm read the first aligned address and mask off the unwanted bytes (this strategy is similar to arch-specific implementations used on powerpc, sparc, and sh). The loop now read word-aligned address and check using the has_zero_eq function. Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc64-linux-gnu, and powerpc-linux-gnu by removing the arch-specific assembly implementation and disabling multi-arch (it covers both LE and BE for 64 and 32 bits). Co-authored-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
* string: Improve generic strlenAdhemerval Zanella2023-02-061-4/+6
| | | | | | | | | | | | | | | | | New algorithm read the first aligned address and mask off the unwanted bytes (this strategy is similar to arch-specific implementations used on powerpc, sparc, and sh). The loop now read word-aligned address and check using the has_zero macro. Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc-linux-gnu, and powercp64-linux-gnu by removing the arch-specific assembly implementation and disabling multi-arch (it covers both LE and BE for 64 and 32 bits). Co-authored-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
* Add string vectorized find and detection functionsAdhemerval Zanella2023-02-066-0/+402
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds generic string find and detection meant to be used in generic vectorized string implementation. The idea is to decompose the basic string operation so each architecture can reimplement if it provides any specialized hardware instruction. The 'string-misc.h' provides miscellaneous functions: - extractbyte: extracts the byte from an specific index. - repeat_bytes: setup an word by replicate the argument on each byte. The 'string-fza.h' provides zero byte detection functions: - find_zero_low, find_zero_all, find_eq_low, find_eq_all, find_zero_eq_low, find_zero_eq_all, and find_zero_ne_all The 'string-fzb.h' provides boolean zero byte detection functions: - has_zero: determine if any byte within a word is zero. - has_eq: determine byte equality between two words. - has_zero_eq: determine if any byte within a word is zero along with byte equality between two words. The 'string-fzi.h' provides positions for string-fza.h results: - index_first: return index of first zero byte within a word. - index_last: return index of first byte different between two words. The 'string-fzc.h' provides a combined version of fza and fzi: - index_first_zero_eq: return index of first zero byte within a word or first byte different between two words. - index_first_zero_ne: return index of first zero byte within a word or first byte equal between two words. - index_last_zero: return index of last zero byte within a word. - index_last_eq: return index of last byte different between two words. The 'string-shift.h' provides a way to mask off parts of a work based on some alignmnet (to handle unaligned arguments): - shift_find, shift_find_last. Co-authored-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
* Parameterize OP_T_THRES from memcopy.hRichard Henderson2023-02-066-14/+51
| | | | | | | | | | | | It moves OP_T_THRES out of memcopy.h to its own header and adjust each architecture that redefines it. Checked with a build and check with run-built-tests=no for all major Linux ABIs. Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
* Parameterize op_t from memcopy.hAdhemerval Zanella2023-02-063-4/+50
| | | | | | | | | | It moves the op_t definition out to an specific header, adds the attribute 'may-alias', and cleanup its duplicated definitions. Checked with a build and check with run-built-tests=no for all major Linux ABIs. Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
* AArch64: Improve SVE memcpy and memmoveWilco Dijkstra2023-02-061-20/+14
| | | | | | | | Improve SVE memcpy by copying 2 vectors if the size is small enough. This improves performance of random memcpy by ~9% on Neoverse V1, and 33-64 byte copies are ~16% faster. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* Move RETURN_TO to x86/sysdep.h and implement x86_64 version.Flavio Cruz2023-02-052-34/+17
| | | | Message-Id: <Y99nfeBrTubZL9oi@jupiter.tail36e24.ts.net>
* Remove sysdeps/mach/i386/machine-sp.hFlavio Cruz2023-02-021-30/+0
| | | | | | | This file is not used today since we end up using sysdeps/i386/htl/machine-sp.h. Getting the stack pointer does not need to be hurd specific and can go into sysdeps/<arch>. Message-Id: <Y9tpWs2WOgE/Duiq@jupiter.tail36e24.ts.net>
* hurd: Move some i386 bits to x86Samuel Thibault2023-02-0210-107/+129
| | | | As they will actually be usable on x86_64 too.
* hurd: Implement SHM_ANONSergey Bugaev2023-02-011-0/+25
| | | | | | | | | | | | | | | This adds a special SHM_ANON value that can be passed into shm_open () in place of a name. When called in this way, shm_open () will create a new anonymous shared memory file. The file will be created in the same way that other shared memory files are created (i.e., under /dev/shm/), except that it is not given a name and therefore cannot be reached from the file system, nor by other calls to shm_open (). This is accomplished by utilizing O_TMPFILE. This is intended to be compatible with FreeBSD's API of the same name. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230130125216.6254-4-bugaevc@gmail.com>
* hurd: Implement O_TMPFILESergey Bugaev2023-02-011-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a flag that causes open () to create a new, unnamed file in the same filesystem as the given directory. The file descriptor can be simply used in the creating process as a temporary file, or shared with children processes via fork (), or sent over a Unix socket. The file can be left anonymous, in which case it will be deleted from the backing file system once all copies of the file descriptor are closed, or given a permanent name with a linkat () call, such as the following: int fd = open ("/tmp", O_TMPFILE | O_RDWR, 0700); /* Do something with the file... */ linkat (fd, "", AT_FDCWD, "/tmp/filename", AT_EMPTY_PATH); In between creating the file and linking it to the file system, it is possible to set the file content, mode, ownership, author, and other attributes, so that the file visibly appears in the file system (perhaps replacing another file) atomically, with all of its attributes already set up. The Hurd support for O_TMPFILE directly exposes the dir_mkfile RPC to user programs. Previously, dir_mkfile was used by glibc internally, in particular for implementing tmpfile (), but not exposed to user programs through a Unix-level API. O_TMPFILE was initially introduced by Linux. This implementation is intended to be compatible with the Linux implementation, except that the O_EXCL flag is not given the special meaning when used together with O_TMPFILE, unlike on Linux. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230130125216.6254-3-bugaevc@gmail.com>
* Linux: optimize clone3 internal usageAdhemerval Zanella Netto2023-02-012-1/+32
| | | | | | | | | | | | Add an optimization to avoid calling clone3 when glibc detects that there is no kernel support. It also adds __ASSUME_CLONE3, which allows skipping this optimization and issuing the clone3 syscall directly. It does not handle the the small window between 5.3 and 5.5 for posix_spawn (CLONE_CLEAR_SIGHAND was added in 5.5). Checked on x86_64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* aarch64: Add the clone3 wrapperAdhemerval Zanella Netto2023-02-012-0/+87
| | | | | | | | | | It follow the internal signature: extern int clone3 (struct clone_args *__cl_args, size_t __size, int (*__func) (void *__arg), void *__arg); Checked on aarch64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* linux: Add clone3 CLONE_CLEAR_SIGHAND optimization to posix_spawnAdhemerval Zanella Netto2023-02-014-26/+52
| | | | | | | | | | | | | | | | | The clone3 flag resets all signal handlers of the child not set to SIG_IGN to SIG_DFL. It allows to skip most of the sigaction calls to setup child signal handling, where previously a posix_spawn had to issue 2 times NSIG sigaction calls (one to obtain the current disposition and another to set either SIG_DFL or SIG_IGN). With POSIX_SPAWN_SETSIGDEF the child will setup the signal for the case where the disposition is SIG_IGN. The code must handle the fallback where clone3 is not available. This is done by splitting __clone_internal_fallback from __clone_internal. Checked on x86_64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* Linux: Do not align the stack for __clone3Adhemerval Zanella Netto2023-02-012-77/+0
| | | | | | | | | | All internal callers of __clone3 should provide an already aligned stack. Removing the stack alignment in __clone3 is a net gain: it simplifies the internal function contract (mask/unmask signals) along with the arch-specific code. Checked on x86_64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* linux: Extend internal clone3 documentationAdhemerval Zanella Netto2023-02-011-9/+1
| | | | | | | | | | | | Different than kernel, clone3 returns EINVAL for NULL struct clone_args or function pointer. This is similar to clone interface that return EINVAL for NULL function argument. It also clean up the Linux clone3.h interface, since it not currently exported. Checked on x86_64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* linux: Do not reset signal handler in posix_spawn if it is already SIG_DFLAdhemerval Zanella Netto2023-02-011-1/+1
| | | | | | | | There is no need to issue another sigaction if the disposition is already SIG_DFL. Checked on x86_64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* x86: Fix strncat-avx2.S reading past length [BZ #30065]Noah Goldstein2023-01-311-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Occurs when `src` has no null-term. Two cases: 1) Zero-length check is doing: ``` test %rdx, %rdx jl L(zero_len) ``` which doesn't actually check zero (was at some point `decq` and the flag never got updated). The fix is just make the flag `jle` i.e: ``` test %rdx, %rdx jle L(zero_len) ``` 2) Length check in page-cross case checking if we should continue is doing: ``` cmpq %r8, %rdx jb L(page_cross_small) ``` which means we will continue searching for null-term if length ends at the end of a page and there was no null-term in `src`. The fix is to make the flag: ``` cmpq %r8, %rdx jbe L(page_cross_small) ```
* Regenerate configure.Carlos O'Donell2023-01-312-3/+4
| | | | | | | Run using vanilla upstream autoconf 2.69. Minor whitespace change to sysdeps/loongarch/configure and sysdeps/mach/configure, and nothing else.
* sparc (64bit): Regenerate ulpsAndreas K. Hüttel2023-01-241-3/+4
| | | | | | | Linux catbus 5.15.69-gentoo #1 SMP Sat Sep 24 07:56:24 PDT 2022 sparc64 sun4v UltraSparc T5 (Niagara5) GNU/Linux gcc (Gentoo 11.3.1_p20221209 p3) 11.3.1 20221209 GNU ld (Gentoo 2.38 p4) 2.38 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* ia64: Regenerate ulpsAndreas K. Hüttel2023-01-241-2/+2
| | | | | | | Linux guppy 5.13.0-00002-gdecb01746d6c #368 SMP Sat Aug 14 20:10:13 UTC 2021 ia64 Dual-Core Intel(R) Itanium(R) Processor 9040 GenuineIntel GNU/Linux gcc (Gentoo 12.2.1_p20221231 p8) 12.2.1 20221231 GNU ld (Gentoo 2.40 p1) 2.40 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* x86: Cache computation for AMD architecture.Sajan Karumanchi2023-01-181-159/+45
| | | | | | | | All AMD architectures cache details will be computed based on __cpuid__ `0x8000_001D` and the reference to __cpuid__ `0x8000_0006` will be zeroed out for future architectures. Reviewed-by: Premachandra Mallappa <premachandra.mallappa@amd.com>
* AArch64: Improve strrchrWilco Dijkstra2023-01-171-25/+33
| | | | | | | | Use shrn for narrowing the mask which simplifies code and speeds up small strings. Unroll the first search loop to improve performance on large strings. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* AArch64: Optimize strnlenWilco Dijkstra2023-01-171-21/+18
| | | | | | | | Optimize strnlen using the shrn instruction and improve the main loop. Small strings are around 10% faster, large strings are 40% faster on modern CPUs. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* AArch64: Optimize strlenWilco Dijkstra2023-01-171-8/+12
| | | | | | | Optimize strlen by unrolling the main loop. Large strings are 64% faster on modern CPUs. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* AArch64: Optimize strcpyWilco Dijkstra2023-01-171-17/+19
| | | | | | Unroll the main loop. Large strings are around 20% faster on modern CPUs. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* AArch64: Improve strchrnulWilco Dijkstra2023-01-171-2/+10
| | | | | | Unroll the main loop, which improves performance slightly. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* AArch64: Optimize strchrWilco Dijkstra2023-01-171-28/+24
| | | | | | | Simplify calculation of the mask using shrn. Unroll the main loop. Small strings are 20% faster on modern CPUs. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* AArch64: Improve strlen_asimdWilco Dijkstra2023-01-171-12/+4
| | | | | | | Use shrn for the mask, merge tst+bne into cbnz, and tweak code alignment. Performance improves slightly as a result. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* AArch64: Optimize memrchrWilco Dijkstra2023-01-171-9/+11
| | | | | | Optimize the main loop - large strings are 43% faster on modern CPUs. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* AArch64: Optimize memchrWilco Dijkstra2023-01-171-13/+14
| | | | | | Optimize the main loop - large strings are 40% faster on modern CPUs. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* math: Suppress -O0 warnings for soft-fp fsqrt [BZ #19444]Adhemerval Zanella2023-01-111-0/+11
| | | | | | The patch suppress the same warnings from 87c266d758d29e52bfb717f90, that shows issues for microblaze, mips soft-fp, nios2, and or1k. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* Add HWCAP2_SVE_EBF16 from Linux 6.1 to AArch64 bits/hwcap.hJoseph Myers2023-01-101-0/+1
| | | | | | | Linux 6.1 adds a new AArch64 HWCAP2 value HWCAP2_SVE_EBF16; add it to the corresponding bits/hwcap.h. Tested with build-many-glibcs.py for aarch64.
* Update copyright dates with scripts/update-copyrightsJoseph Myers2023-01-067110-7110/+7110
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* Fix ldbl-128 built-in function useJoseph Myers2023-01-053-2/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | Fix the following issues with built-in function use in sysdeps/ieee754/ldbl-128 and sysdeps/ieee754/float128: * fabsl used __builtin_fabsf128 unconditionally, breaking the build with GCC 6 for several architectures; it should use __builtin_fabsl with an appropriate redirection in float128_private.h. (I'm not particularly concerned with building glibc with GCC 6; rather, I want to be able to run the tgmath.h tests with GCC 6, which is a significantly different case for tgmath.h compared to GCC 7 and later because of the lack of _FloatN / _FloatNx support in the compiler, and at present running the tests with a compiler means building glibc with that compiler.) * Some (conditional) uses of built-in functions had been added to ldbl-128 without appropriate float128_private.h remapping (there was remapping for the macros controlling whether the built-in functions are used, just not for the functions themselves). * s_llrintl.c called __builtin_round not __builtin_llrintl, which is obviously wrong. Tested with build-many-glibcs.py for aarch64-linux-gnu, GCC 6 (where it fixes the glibc build) and GCC 12, and with the glibc testsuite for x86_64.
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