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| author | CoprDistGit <infra@openeuler.org> | 2024-10-15 06:24:53 +0000 |
|---|---|---|
| committer | CoprDistGit <infra@openeuler.org> | 2024-10-15 06:24:53 +0000 |
| commit | 2fb6e0cf79df2056e9750e29669c4633555e74b8 (patch) | |
| tree | a1ad5fd201e579ad1245110c036501053a8794b3 /Fix-avx2-strncmp-offset-compare-condition-check-BZ-2.patch | |
| parent | 711949a2ac2288db2115787d9d9cca9cef093ccf (diff) | |
automatic import of glibcopeneuler22.03_LTS_SP3
Diffstat (limited to 'Fix-avx2-strncmp-offset-compare-condition-check-BZ-2.patch')
| -rw-r--r-- | Fix-avx2-strncmp-offset-compare-condition-check-BZ-2.patch | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/Fix-avx2-strncmp-offset-compare-condition-check-BZ-2.patch b/Fix-avx2-strncmp-offset-compare-condition-check-BZ-2.patch new file mode 100644 index 0000000..a613744 --- /dev/null +++ b/Fix-avx2-strncmp-offset-compare-condition-check-BZ-2.patch @@ -0,0 +1,52 @@ +From 75870237ff3bb363447b03f4b0af100227570910 Mon Sep 17 00:00:00 2001 +From: Sunil K Pandey <skpgkp1@gmail.com> +Date: Fri, 12 Jun 2020 08:57:16 -0700 +Subject: [PATCH] Fix avx2 strncmp offset compare condition check [BZ #25933] + +strcmp-avx2.S: In avx2 strncmp function, strings are compared in +chunks of 4 vector size(i.e. 32x4=128 byte for avx2). After first 4 +vector size comparison, code must check whether it already passed +the given offset. This patch implement avx2 offset check condition +for strncmp function, if both string compare same for first 4 vector +size. +--- + sysdeps/x86_64/multiarch/strcmp-avx2.S | 15 +++++++++++++++ + 1 file changed, 15 insertions(+) + +diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S +index 5f88a68262..d42b04b54f 100644 +--- a/sysdeps/x86_64/multiarch/strcmp-avx2.S ++++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S +@@ -591,7 +591,14 @@ L(loop_cross_page_2_vec): + movl $(PAGE_SIZE / (VEC_SIZE * 4) - 1), %esi + + testq %rdi, %rdi ++# ifdef USE_AS_STRNCMP ++ /* At this point, if %rdi value is 0, it already tested ++ VEC_SIZE*4+%r10 byte starting from %rax. This label ++ checks whether strncmp maximum offset reached or not. */ ++ je L(string_nbyte_offset_check) ++# else + je L(back_to_loop) ++# endif + tzcntq %rdi, %rcx + addq %r10, %rcx + /* Adjust for number of bytes skipped. */ +@@ -627,6 +634,14 @@ L(loop_cross_page_2_vec): + VZEROUPPER + ret + ++# ifdef USE_AS_STRNCMP ++L(string_nbyte_offset_check): ++ leaq (VEC_SIZE * 4)(%r10), %r10 ++ cmpq %r10, %r11 ++ jbe L(zero) ++ jmp L(back_to_loop) ++# endif ++ + .p2align 4 + L(cross_page_loop): + /* Check one byte/dword at a time. */ +-- +2.19.1 + |