[gcc r12-7914] [nvptx, doc] Update misa and mptx, add march and march-map

[gcc r12-7914] [nvptx, doc] Update misa and mptx, add march and march-map

[Tom de Vries]

https://gcc.gnu.org/g:9778a7dc0b3000813a1d25669bf2735f38219650

commit r12-7914-g9778a7dc0b3000813a1d25669bf2735f38219650
Author: Tom de Vries <tdevries@suse.de>
Date:   Tue Mar 29 15:24:07 2022 +0200

    [nvptx, doc] Update misa and mptx, add march and march-map
    
    Update nvptx documentation:
    - Use meaningful terms: "PTX ISA target architecture" and "PTX ISA version".
    - Remove invalid claim that "ISA strings must be lower-case".
    - Add missing sm_xx entries.
    - Fix misa default.
    - Add march, copying misa doc.
    - Declare misa an march alias.
    - Add march-map.
    - Fix "for given the specified" typo.
    
    gcc/ChangeLog:
    
    2022-03-29  Tom de Vries  <tdevries@suse.de>
    
            * doc/invoke.texi (misa, mptx): Update.
            (march, march-map): Add.

Diff:
---
 gcc/doc/invoke.texi | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 554e04ecbf3..43b75132c91 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -27540,18 +27540,31 @@ These options are defined for Nvidia PTX:
 Ignored, but preserved for backward compatibility.  Only 64-bit ABI is
 supported.
 
-@item -misa=@var{ISA-string}
+@item -march=@var{architecture-string}
 @opindex march
-Generate code for given the specified PTX ISA (e.g.@: @samp{sm_35}).  ISA
-strings must be lower-case.  Valid ISA strings include @samp{sm_30} and
-@samp{sm_35}.  The default ISA is sm_35.
+Generate code for the specified PTX ISA target architecture
+(e.g.@: @samp{sm_35}).  Valid architecture strings are @samp{sm_30},
+@samp{sm_35}, @samp{sm_53}, @samp{sm_70}, @samp{sm_75} and
+@samp{sm_80}.  The default target architecture is sm_30.
+
+@item -misa=@var{architecture-string}
+@opindex misa
+Alias of @option{-march=}.
+
+@item -march-map=@var{architecture-string}
+@opindex march
+Select the closest available @option{-march=} value that is not more
+capable.  For instance, for @option{-march-map=sm_50} select
+@option{-march=sm_35}, and for @option{-march-map=sm_53} select
+@option{-march=sm_53}.
 
 @item -mptx=@var{version-string}
 @opindex mptx
-Generate code for given the specified PTX version (e.g.@: @samp{7.0}).
+Generate code for the specified PTX ISA version (e.g.@: @samp{7.0}).
 Valid version strings include @samp{3.1}, @samp{6.0}, @samp{6.3}, and
-@samp{7.0}.  The default PTX version is 6.0, unless a higher minimal
-version is required for specified PTX ISA via option @option{-misa=}.
+@samp{7.0}.  The default PTX ISA version is 6.0, unless a higher
+version is required for specified PTX ISA target architecture via
+option @option{-march=}.
 
 @item -mmainkernel
 @opindex mmainkernel