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Add comments that Solaris Sun compiler only supports sparc9 ASM,

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This commit is contained in:
Bruce Momjian
2006-05-17 23:57:03 +00:00
parent 0d02ef4be4
commit 407885ea3b
2 changed files with 22 additions and 1 deletions
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17
src/backend/port/tas/solaris_sparc.s
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@@ -16,6 +16,23 @@
.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. If this fails on existing Solaris
! systems, we need to use a !defined(__sparcv9) test
! to fall back to the old "ldstub" call for sparcv8 compiles.
! gcc continues to use "ldstub" because there is no indication
! which sparc version it is targeting.
!
! There actually is a trick for embedding "cas" for a compiler
! that is targeting sparcv8:
!
! http://cvs.opensolaris.org/source/xref/on/usr/src/lib/libc/sparc/threads/sparc.il
!
! This might work for sparc8:
! ldstub [%o0],%o1 ! moves only a byte
cas [%o0],%o2,%o1
mov %o1,%o0
retl