S/390: Add alternate processor names.

This patch adds alternate CPU names which adhere to the number of the
architecture document.  So instead of having z196, zEC12, and z13 you
can use arch9, arch10, and arch11.  The old cpu names stay valid and
should primarily be used.

The alternate names are supposed to improve compatibility with the IBM
XL compiler toolchain which uses the arch numbering.

opcodes/ChangeLog:

2016-09-12  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* s390-mkopc.c (main): Support alternate arch strings.

gas/ChangeLog:

2016-09-12  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* config/tc-s390.c (s390_parse_cpu): Support alternate arch
	strings.
	* doc/as.texinfo: Document new arch strings.
	* doc/c-s390.texi: Likewise.

2 files changed, 32 insertions, 16 deletions

diff --git a/gas/doc/as.texinfo b/gas/doc/as.texinfo
index 9ebfda0..d09e0d4 100644
--- a/gas/doc/as.texinfo
+++ b/gas/doc/as.texinfo
@@ -1654,9 +1654,11 @@ Select the word size, either 31/32 bits or 64 bits.
 Select the architecture mode, either the Enterprise System
 Architecture (esa) or the z/Architecture mode (zarch).
 @item -march=@var{processor}
-Specify which s390 processor variant is the target, @samp{g6}, @samp{g6},
-@samp{z900}, @samp{z990}, @samp{z9-109}, @samp{z9-ec}, @samp{z10},
-@samp{z196}, @samp{zEC12}, or @samp{z13}.
+Specify which s390 processor variant is the target, @samp{g5} (or
+@samp{arch3}), @samp{g6}, @samp{z900} (or @samp{arch5}), @samp{z990} (or
+@samp{arch6}), @samp{z9-109}, @samp{z9-ec} (or @samp{arch7}), @samp{z10} (or
+@samp{arch8}), @samp{z196} (or @samp{arch9}), @samp{zEC12} (or @samp{arch10}),
+or @samp{z13} (or @samp{arch11}).
 @item -mregnames
 @itemx -mno-regnames
 Allow or disallow symbolic names for registers.
diff --git a/gas/doc/c-s390.texi b/gas/doc/c-s390.texi
index e3277cb..1cbf308 100644
--- a/gas/doc/c-s390.texi
+++ b/gas/doc/c-s390.texi
@@ -14,9 +14,11 @@
 @cindex s390 support
 
 The s390 version of @code{@value{AS}} supports two architectures modes
-and seven chip levels. The architecture modes are the Enterprise System
+and ten chip levels. The architecture modes are the Enterprise System
 Architecture (ESA) and the newer z/Architecture mode. The chip levels
-are g5, g6, z900, z990, z9-109, z9-ec, z10, z196, zEC12, and z13.
+are g5 (or arch3), g6, z900 (or arch5), z990 (or arch6), z9-109, z9-ec
+(or arch7), z10 (or arch8), z196 (or arch9), zEC12 (or arch10), and
+z13 (or arch11).
 
 @menu
 * s390 Options::                Command-line Options.
@@ -58,19 +60,31 @@ message.
 @item -march=@var{CPU}
 This option specifies the target processor. The following processor names
 are recognized:
-@code{g5},
+@code{g5} (or @code{arch3}),
 @code{g6},
-@code{z900},
-@code{z990},
+@code{z900} (or @code{arch5}),
+@code{z990} (or @code{arch6}),
 @code{z9-109},
-@code{z9-ec},
-@code{z10},
-@code{z196},
-@code{zEC12}, and
-@code{z13}.
-Assembling an instruction that is not supported on the target processor
-results in an error message. Do not specify @code{g5} or @code{g6}
-with @samp{-mzarch}.
+@code{z9-ec} (or @code{arch7}),
+@code{z10} (or @code{arch8}),
+@code{z196} (or @code{arch9}),
+@code{zEC12} (or @code{arch10}) and
+@code{z13} (or @code{arch11}).
+
+Assembling an instruction that is not supported on the target
+processor results in an error message.
+
+The processor names starting with @code{arch} refer to the edition
+number in the Principle of Operations manual.  They can be used as
+alternate processor names and have been added for compatibility with
+the IBM XL compiler.
+
+@code{arch3}, @code{g5} and @code{g6} cannot be used with the
+@samp{-mzarch} option since the z/Architecture mode is not supported
+on these processor levels.
+
+There is no @code{arch4} option supported. @code{arch4} matches
+@code{-march=arch5 -mesa}.
 
 @cindex @samp{-mregnames} option, s390
 @item -mregnames