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Allow sparcv8plus to use "cas".

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Theo Schlossnagle
This commit is contained in:
Bruce Momjian 2006-05-18 18:51:50 +00:00
parent d8f940f281
commit 8d988c7d1c
1 changed files with 9 additions and 10 deletions
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19
src/backend/port/tas/solaris_sparc.s
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@ -16,21 +16,20 @@
.global pg_atomic_cas
pg_atomic_cas:
! "cas" only works on sparcv9 chips, and requies a compiler
! that is targeting sparcv9. 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
! there is no indication which sparc version it is targeting.
! "cas" only works on sparcv9 and sparcv8plus chips, and
! requies 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.
!
! It is actually possible to use "cas" for sparcv8 binaries if
! -xarch=v8plus is used for compilation. There is actually a
! trick for embedding "cas" in a sparcv8-targeted compiler, but
! it can only be run on a sparcv8plus cpus:
! 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
!
#ifdef __sparcv9
#if defined(__sparcv9) || defined(__sparcv8plus)
cas [%o0],%o2,%o1
#else
ldstub [%o0],%o1