Add more sparcv8plus comments.

diff --git a/src/backend/port/tas/solaris_sparc.s b/src/backend/port/tas/solaris_sparc.s
index 891e248736bd2cdfd070b08f59983e3d5713dc38..2f273cce583b505d9abbf16044e85380b8e5bb86 100644 (file)
--- a/src/backend/port/tas/solaris_sparc.s
+++ b/src/backend/port/tas/solaris_sparc.s
@@ -22,13 +22,13 @@ pg_atomic_cas:
    ! 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:
+   ! 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:
    !
    !   http://cvs.opensolaris.org/source/xref/on/usr/src/lib/libc/sparc/threads/sparc.il
    !
-   ! It is actually possible to use "cas" for sparcv8 binaries if 
-   ! -xarch=v8plus is used for compilation.
 
 #ifdef __sparcv9
    cas     [%o0],%o2,%o1