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Simplify TLS and reduce startup latency

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This change simplifies the thread-local storage support code. On Windows
and Mac OS X the startup latency of __enable_tls() has been reduced from
30ms to 1ms. On Windows, TLS memory accesses will now go much faster due
to better self-modifying code that prevents a function call and acquires
our thread information block pointer in a single instruction.
This commit is contained in:
Justine Tunney 2022-07-18 03:33:32 -07:00
parent 38c3fa63fe
commit b1d9d11be1
15 changed files with 136 additions and 312 deletions
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2
libc/sysv/sysv.mk
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@ -39,8 +39,6 @@ LIBC_SYSV_A_FILES := \
libc/sysv/systemfive.S \
libc/sysv/errno_location.greg.c \
libc/sysv/errno.c \
libc/sysv/gettls.greg.c \
libc/sysv/tlspolyfill.S \
libc/sysv/errfun.S \
libc/sysv/strace.greg.c \
libc/sysv/describeos.greg.c \