b68cfb3330
Upstream commit: b2f32e746492615a6eb3e66fac1e766e32e8deb1
- malloc: Simplify implementation of __malloc_assert
- Update syscall-names.list for Linux 5.18
- x86: Add missing IS_IN (libc) check to strncmp-sse4_2.S
- x86: Move mem{p}{mov|cpy}_{chk_}erms to its own file
- x86: Move and slightly improve memset_erms
- x86: Add definition for __wmemset_chk AVX2 RTM in ifunc impl list
- x86: Put wcs{n}len-sse4.1 in the sse4.1 text section
- x86: Align entry for memrchr to 64-bytes.
- x86: Add BMI1/BMI2 checks for ISA_V3 check
- x86: Cleanup bounds checking in large memcpy case
- x86: Add bounds `x86_non_temporal_threshold`
- x86: Add sse42 implementation to strcmp's ifunc
- x86: Fix misordered logic for setting `rep_movsb_stop_threshold`
- x86: Align varshift table to 32-bytes
- x86: ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST expect no transactions
- x86: Shrink code size of memchr-evex.S
- x86: Shrink code size of memchr-avx2.S
- x86: Optimize memrchr-avx2.S
- x86: Optimize memrchr-evex.S
- x86: Optimize memrchr-sse2.S
- x86: Add COND_VZEROUPPER that can replace vzeroupper if no `ret`
- x86: Create header for VEC classes in x86 strings library
- x86_64: Add strstr function with 512-bit EVEX
- x86-64: Ignore r_addend for R_X86_64_GLOB_DAT/R_X86_64_JUMP_SLOT
- x86_64: Implement evex512 version of strlen, strnlen, wcslen and wcsnlen
- x86_64: Remove bzero optimization
- x86_64: Remove end of line trailing spaces
- nptl: Fix ___pthread_unregister_cancel_restore asynchronous restore
- linux: Fix mq_timereceive check for 32 bit fallback code (BZ 29304)
34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
commit 820504e3edd7276bf869d543ad5b57187ff9c9b6
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Author: Noah Goldstein <goldstein.w.n@gmail.com>
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Date: Fri Jun 3 18:52:37 2022 -0500
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x86: ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST expect no transactions
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Give fall-through path to `vzeroupper` and taken-path to `vzeroall`.
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Generally even on machines with RTM the expectation is the
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string-library functions will not be called in transactions.
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Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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(cherry picked from commit c28db9cb29a7d6cf3ce08fd8445e6b7dea03f35b)
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diff --git a/sysdeps/x86_64/sysdep.h b/sysdeps/x86_64/sysdep.h
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index 93e44be22e2275f1..04478b097cdffe20 100644
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--- a/sysdeps/x86_64/sysdep.h
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+++ b/sysdeps/x86_64/sysdep.h
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@@ -99,11 +99,11 @@ lose: \
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to avoid RTM abort triggered by VZEROUPPER inside transactionally. */
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#define ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST \
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xtest; \
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- jz 1f; \
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- vzeroall; \
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+ jnz 1f; \
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+ vzeroupper; \
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ret; \
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1: \
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- vzeroupper; \
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+ vzeroall; \
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ret
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/* Can be used to replace vzeroupper that is not directly before a
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