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!-------------------------------------------------------------------------
!
! sunstudio_sparc.s
! compare and swap for Sun Studio on Sparc
!
! Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
! Portions Copyright (c) 1994, Regents of the University of California
!
! IDENTIFICATION
! src/backend/port/tas/sunstudio_sparc.s
!
!-------------------------------------------------------------------------
! Fortunately the Sun compiler can process cpp conditionals with -P
! '/' is the comment for x86, while '!' is the comment for Sparc
#if defined(__sparcv9) || defined(__sparc)
.section ".text"
.align 8
.skip 24
.align 4
.global pg_atomic_cas
pg_atomic_cas:
! "cas" only works on sparcv9 and sparcv8plus chips, and
! requires a compiler targeting these CPUs. It will fail
! on a compiler targeting sparcv8, and of course will not
! be understood by a sparcv8 CPU. gcc continues to use
! "ldstub" because it targets sparcv7.
!
! There is actually a trick for embedding "cas" in a
! sparcv8-targeted compiler, but it can only be run
! on a sparcv8plus/v9 cpus:
!
! http://cvs.opensolaris.org/source/xref/on/usr/src/lib/libc/sparc/threads/sparc.il
!
! NB: We're assuming we're running on a TSO system here - solaris
! userland luckily always has done so.
#if defined(__sparcv9) || defined(__sparcv8plus)
cas [%o0],%o2,%o1
#else
ldstub [%o0],%o1
#endif
mov %o1,%o0
retl
nop
.type pg_atomic_cas,2
.size pg_atomic_cas,(.-pg_atomic_cas)
#endif
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