Add simplified sparc8 ASM for solaris_sparc.s, from Alan Stange.

diff --git a/src/backend/port/tas/solaris_sparc.s b/src/backend/port/tas/solaris_sparc.s
index 59c4487..51ba569 100644 (file)
--- a/src/backend/port/tas/solaris_sparc.s
+++ b/src/backend/port/tas/solaris_sparc.s
@@ -19,21 +19,19 @@ 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.
+       ! by a sparcv8 CPU.  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
 
+#ifdef __sparcv9
        cas     [%o0],%o2,%o1
+#else
+       ldstub [%o0],%o1
+#endif
        mov     %o1,%o0
        retl
        nop