Allow sparcv8plus to use "cas".

Theo Schlossnagle

diff --git a/src/backend/port/tas/solaris_sparc.s b/src/backend/port/tas/solaris_sparc.s
index 2f273cc..183cea1 100644 (file)
--- a/src/backend/port/tas/solaris_sparc.s
+++ b/src/backend/port/tas/solaris_sparc.s
@@ -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