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authorNoah Goldstein <goldstein.w.n@gmail.com>2021-10-21 15:54:57 -0500
committerNoah Goldstein <goldstein.w.n@gmail.com>2021-10-26 16:51:29 -0500
commit44829b3ddb64e99e37343a0f25b2c082387d31a5 (patch)
treeba9565215210f530296dd4456816fc69f593e542 /sysdeps/unix/sysv/linux/aarch64
parent8438135d3481853e300e1043cfee3946dadb28b3 (diff)
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String: Add support for __memcmpeq() ABI on all targets
No bug. This commit adds support for __memcmpeq() as a new ABI for all targets. In this commit __memcmpeq() is implemented only as an alias to the corresponding targets memcmp() implementation. __memcmpeq() is added as a new symbol starting with GLIBC_2.35 and defined in string.h with comments explaining its behavior. Basic tests that it is callable and works where added in string/tester.c As discussed in the proposal "Add new ABI '__memcmpeq()' to libc" __memcmpeq() is essentially a reserved namespace for bcmp(). The means is shares the same specifications as memcmp() except the return value for non-equal byte sequences is any non-zero value. This is less strict than memcmp()'s return value specification and can be better optimized when a boolean return is all that is needed. __memcmpeq() is meant to only be called by compilers if they can prove that the return value of a memcmp() call is only used for its boolean value. All tests in string/tester.c passed. As well build succeeds on x86_64-linux-gnu target.
Diffstat (limited to 'sysdeps/unix/sysv/linux/aarch64')
-rw-r--r--sysdeps/unix/sysv/linux/aarch64/libc.abilist1
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index 21a2e50..f227ae6 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2612,3 +2612,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F