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This patch set introduces optimized string, wcsmbs and memory functions for S390/S390x. The functions are accelerated by the usage of the new z13 vector instructions. The Principles of Operations manual for IBM z13 is publically available: http://publibfi.boulder.ibm.com/epubs/pdf/dz9zr010.pdf The support for these instructions in assembler was introduced by commits: -"[Committed] S/390: Add support for IBM z13." (https://sourceware.org/ml/binutils/2015-01/msg00197.html) -"[Committed] S/390: Add more IBM z13 instructions" (https://sourceware.org/ml/binutils/2015-03/msg00088.html) The first patches do preparation for the latter optimization patches. The floating point exception handling - fetestexcept(), ... - is fixed and the platform and hwcap strings are extended. The current ifunc routines memset, memcpy and memcmp are refactored and the ifunc test-framework is now enabled. A S390 specific configure-check tests if the used binutils supports the new vector instructions. The optimized functions are provided via ifunc if the binutils supports the vector instructions. Otherwise a message is dumped to configure output and only the currently used common code functions are available. The optimized functions are implemented in common for s390-32 and s390-64 and the few differences are handled via #ifdef. The ifunc-resolvers are defined in files sysdeps/s390/multiarch/<func>.c, which choose either the current implementation __<func>_c() or the vector implementation __<func>_vx() depending on the HWCAP_S390_VX flag bit in AT_HWCAP field. If the bit is set, the hardware and the kernel are supporting vector registers and instructions. If the used binutils lacks vector-support, then the default implementation in string or wcsmbs directory is included here instead. The file sysdeps/s390/multiarch/<func>-c.c includes the current implementation and defines the function name __<func>_c. The assembler files sysdeps/s390/multiarch/<func>-vx.S with the vector instructions are using the directive '.machine "z13"' to allow building glibc without option '-march=z13'. Additionally the directive '.machinemode "zarch_nohighgprs"' is needed for the 31bit glibc. This mode does not set the highgprs flag in ELF header, which would lead to an unloadable libc on a 31bit kernel. The most optimized string functions are structured in the same way: The first 16 bytes of the string is loaded unaligned via vlbb - vector load to block boundary (e.g. 4k). This instruction loads 16 bytes if possible. In case of a page cross, it only loads the last bytes of the current page without a segmentation fault. Afterwards these first part of string is processed. If e.g. for strlen the end of string is reached within this first part, the function returns. Otherwise the pointer is aligned to 16 byte, so i can load a full vector register with vl without checking for a page cross. Afterwards the first part of string is processed. If e.g. for strlen the end of string is reached within this first part, the function returns. Otherwise the pointer is aligned to 16 byte, so a full vector register can be loaded with vl - vector load - without checking for a page cross. The remaining string is processed in a four times unrolled loop, because benchmark results measured improvements compared to a non unrolled loop. The optimized wide string functions can only handle 4byte aligned string pointers. Although a wchar_t pointer should always be 4byte aligned, the most current common code wide string functions can handle non aligned strings. Thus the optimized functions will fall back to the common code functions in case of a non aligned wide string to behave the same as before this patch. Some string tests can test the string and the wide string version of a function. The remaining ones are extended and new wide string tests are added. This is the same in case of the benchtests. ChangeLog: * NEWS: New item for IBM z13 string optimizations. |
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| bits | ||
| catgets | ||
| conf | ||
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| debug | ||
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| string | ||
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| sysdeps | ||
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| time | ||
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| ChangeLog | ||
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| config.h.in | ||
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| configure | ||
| configure.ac | ||
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| NAMESPACE | ||
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| README | ||
| Rules | ||
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| version.h | ||
| WUR-REPORT | ||
This directory contains the sources of the GNU C Library. See the file "version.h" for what release version you have. The GNU C Library is the standard system C library for all GNU systems, and is an important part of what makes up a GNU system. It provides the system API for all programs written in C and C-compatible languages such as C++ and Objective C; the runtime facilities of other programming languages use the C library to access the underlying operating system. In GNU/Linux systems, the C library works with the Linux kernel to implement the operating system behavior seen by user applications. In GNU/Hurd systems, it works with a microkernel and Hurd servers. The GNU C Library implements much of the POSIX.1 functionality in the GNU/Hurd system, using configurations i[4567]86-*-gnu. The current GNU/Hurd support requires out-of-tree patches that will eventually be incorporated into an official GNU C Library release. When working with Linux kernels, this version of the GNU C Library requires Linux kernel version 2.6.32 or later. Also note that the shared version of the libgcc_s library must be installed for the pthread library to work correctly. The GNU C Library supports these configurations for using Linux kernels: aarch64*-*-linux-gnu alpha*-*-linux-gnu arm-*-linux-gnueabi hppa-*-linux-gnu Not currently functional without patches. i[4567]86-*-linux-gnu x86_64-*-linux-gnu Can build either x86_64 or x32 ia64-*-linux-gnu m68k-*-linux-gnu microblaze*-*-linux-gnu mips-*-linux-gnu mips64-*-linux-gnu powerpc-*-linux-gnu Hardware or software floating point, BE only. powerpc64*-*-linux-gnu Big-endian and little-endian. s390-*-linux-gnu s390x-*-linux-gnu sh[34]-*-linux-gnu sparc*-*-linux-gnu sparc64*-*-linux-gnu tilegx-*-linux-gnu tilepro-*-linux-gnu If you are interested in doing a port, please contact the glibc maintainers; see http://www.gnu.org/software/libc/ for more information. See the file INSTALL to find out how to configure, build, and install the GNU C Library. You might also consider reading the WWW pages for the C library at http://www.gnu.org/software/libc/. The GNU C Library is (almost) completely documented by the Texinfo manual found in the `manual/' subdirectory. The manual is still being updated and contains some known errors and omissions; we regret that we do not have the resources to work on the manual as much as we would like. For corrections to the manual, please file a bug in the `manual' component, following the bug-reporting instructions below. Please be sure to check the manual in the current development sources to see if your problem has already been corrected. Please see http://www.gnu.org/software/libc/bugs.html for bug reporting information. We are now using the Bugzilla system to track all bug reports. This web page gives detailed information on how to report bugs properly. The GNU C Library is free software. See the file COPYING.LIB for copying conditions, and LICENSES for notices about a few contributions that require these additional notices to be distributed. License copyright years may be listed using range notation, e.g., 1996-2015, indicating that every year in the range, inclusive, is a copyrightable year that would otherwise be listed individually.