[PATCH v3 2/5] [ARC] Update command line option documentation

[Graham Markall]

Adds documentation for the new -mnps400 flag and several other
already extant flags.

gas/ChangeLog:

        * config/tc-arc.c (md_show_usage): Document flags for NPS-400 and
        add some other undocumented flags.
        * doc/c-arc.texi: Document the -mnps400, -mspfp, -mdpfp, and -fpuda
        flags.
---
 gas/ChangeLog       |  7 +++++++
 gas/config/tc-arc.c | 43 +++++++++++++++++++++++++++++++++++++++++--
 gas/doc/c-arc.texi  | 20 +++++++++++++++++---
 3 files changed, 65 insertions(+), 5 deletions(-)

diff --git a/gas/config/tc-arc.c b/gas/config/tc-arc.c
index 10fee83..174fb69 100644
--- a/gas/config/tc-arc.c
+++ b/gas/config/tc-arc.c
@@ -3401,6 +3401,17 @@ md_show_usage (FILE *stream)
   fprintf (stream, _("ARC-specific assembler options:\n"));
 
   fprintf (stream, "  -mcpu=<cpu name>\t  assemble for CPU <cpu name>\n");
+  fprintf (stream, "  -mA6/-mARC600/-mARC601  same as -mcpu=arc600\n");
+  fprintf (stream, "  -mA7/-mARC700\t\t  same as -mcpu=arc700\n");
+  fprintf (stream, "  -mEM\t\t\t  same as -mcpu=arcem\n");
+  fprintf (stream, "  -mHS\t\t\t  same as -mcpu=archs\n");
+
+  fprintf (stream, "  -mnps400\t\t  enable NPS-400 extended instructions\n");
+  fprintf (stream, "  -mspfp\t\t  enable single-precision floating point instructions\n");
+  fprintf (stream, "  -mdpfp\t\t  enable double-precision floating point instructions\n");
+  fprintf (stream, "  -mfpuda\t\t  enable double-precision assist floating "
+                   "point\n\t\t\t  instructions for ARC EM\n");
+
   fprintf (stream,
 	   "  -mcode-density\t  enable code density option for ARC EM\n");
 
@@ -3409,8 +3420,36 @@ md_show_usage (FILE *stream)
   fprintf (stream, _("\
   -EL                     assemble code for a little-endian cpu\n"));
   fprintf (stream, _("\
-  -mrelax                  Enable relaxation\n"));
-
+  -mrelax                 enable relaxation\n"));
+
+  fprintf (stream, _("The following ARC-specific assembler options are "
+                     "deprecated and are accepted\nfor compatibility only:\n"));
+
+  fprintf (stream, _("  -muser-mode-only\n"
+                     "  -mld-extension-reg-mask\n"
+                     "  -mswap\n"
+                     "  -mnorm\n"
+                     "  -mbarrel-shifter\n"
+                     "  -mbarrel_shifter\n"
+                     "  -mmin-max\n"
+                     "  -mmin_max\n"
+                     "  -mno-mpy\n"
+                     "  -mEA\n"
+                     "  -mmul64\n"
+                     "  -msimd\n"
+                     "  -mmac-d16\n"
+                     "  -mmac_d16\n"
+                     "  -mmac-24\n"
+                     "  -mmac_24\n"
+                     "  -mdsp-packa\n"
+                     "  -mdsp_packa\n"
+                     "  -mcrc\n"
+                     "  -mdvbf\n"
+                     "  -mtelephony\n"
+                     "  -mxy\n"
+                     "  -mlock\n"
+                     "  -mswape\n"
+                     "  -mrtsc\n"));
 }
 
 /* Find the proper relocation for the given opcode.  */
diff --git a/gas/doc/c-arc.texi b/gas/doc/c-arc.texi
index 4852c3d..4969795 100644
--- a/gas/doc/c-arc.texi
+++ b/gas/doc/c-arc.texi
@@ -56,9 +56,6 @@ Assemble for ARC 601.  Alias: @code{-mARC601}.
 @cindex @code{mARC700} command line option, ARC
 Assemble for ARC 700.  Aliases: @code{-mA7}, @code{-mARC700}.
 
-@item nps400
-Assemble for NPS400.
-
 @item arcem
 @cindex @code{mEM} command line option, ARC
 Assemble for ARC EM.  Aliases: @code{-mEM}
@@ -94,6 +91,23 @@ Enable support for assembly-time relaxation.  The assembler will
 replace a longer version of an instruction with a shorter one,
 whenever it is possible.
 
+@cindex @code{-mnps400} command line option, ARC
+@item -mnps400
+Enable support for NPS-400 extended instructions.
+
+@cindex @code{-mspfp} command line option, ARC
+@item -mspfp
+Enable support for single-precision floating point instructions.
+
+@cindex @code{-mdpfp} command line option, ARC
+@item -mdpfp
+Enable support for double-precision floating point instructions.
+
+@cindex @code{-mfpuda} command line option, ARC
+@item -mfpuda
+Enable support for double-precision assist floating point instructions.
+Only valid for ARC EM processors.
+
 @end table
 
 @node ARC Syntax
-- 
2.5.5