md.texi (Machine Constraints): Document additional i386 constraints and fix description of "A".

        * md.texi (Machine Constraints): Document additional i386
        constraints and fix description of "A".

From-SVN: r41642

gcc/ChangeLog

+2001-04-27  Andreas Jaeger  <aj@suse.de>
+	    Richard Henderson  <rth@redhat.com>
+
+	* md.texi (Machine Constraints): Document additional i386
+	constraints and fix description of "A".
+
 Fri Apr 27 10:43:49 2001  Jeffrey A Law  (law@cygnus.com)
 
 	* tm.texi (TARGET_MEM_FUNCTIONS): Update text.
@@ -31,7 +37,7 @@ Thu Apr 26 19:20:28 CEST 2001  Jan Hubicka  <jh@suse.cz>
 2001-04-26  Andrew Haley  <aph@cambridge.redhat.com>
 
 	* except.c (expand_eh_region_end_cleanup): Force pending stack
-	adjust before emitting label that branches around cleanup code. 
+	adjust before emitting label that branches around cleanup code.
 
 2001-04-26  H.J. Lu  (hjl@gnu.org)
 
@@ -296,7 +302,7 @@ Mon Apr 23 14:32:12 CEST 2001  Jan Hubicka  <jh@suse.cz>
 	(loop_delete_insns): New function.
 	* unroll.c (initial_reg_note_copy): Copy INSN_LIST notes, even if
 	we're not substituting into them yet.
-	
+
 2001-04-21  Kazu Hirata  <kazu@hxi.com>
 
 	* config/h8300/h8300.c (general_operand_src): Fix a comment typo.
@@ -404,7 +410,7 @@ Thu Apr 19 19:15:26 2001  Jeffrey A Law  (law@cygnus.com)
 	instead of OBJECT_SUFFIX.
 	* collect2.c (find_a_file): Look for files matching the extension
 	HOST_EXECUTABLE_SUFFIX instead of EXECUTABLE_SUFFIX.
-	* gcc.c (DEFAULT_SWITCH_CURTAILS_COMPILATION): Depend on 
+	* gcc.c (DEFAULT_SWITCH_CURTAILS_COMPILATION): Depend on
 	TARGET_EXECUTABLE_SUFFIX.
 	(find_a_file): Use HOST_EXECUTABLE_SUFFIX.
 	(make_relative_prefix): Likewise.

gcc/md.texi

@@ -1539,7 +1539,7 @@ System V Release 4 small data area reference
 @table @code
 @item q
 @samp{a}, @code{b}, @code{c}, or @code{d} register for the i386.
-For x86-64 it is equivalent to @samp{r} class. (for 8bit instrucitons that
+For x86-64 it is equivalent to @samp{r} class. (for 8bit instructions that
 do not use upper halves)
 
 @item Q
@@ -1552,7 +1552,10 @@ Legacy register --- equivalent to @code{r} class in i386 mode.
 instruction)
 
 @item A
-@samp{a}, or @code{d} register (for 64-bit ints)
+Specifies the @samp{a} or @samp{d} registers.  This is primarily useful
+for 64-bit integer values (when in 32-bit mode) intended to be returned
+with the @samp{d} register holding the most significant bits and the
+@samp{a} register holding the least significant bits.
 
 @item f
 Floating point register
@@ -1581,6 +1584,12 @@ Second floating point register
 @item S
 @samp{si} register
 
+@item x
+@samp{xmm} SSE register
+
+@item y
+MMX register
+
 @item I
 Constant in range 0 to 31 (for 32 bit shifts)