[gcc r15-6029] nvptx: Switch default from '-march=sm_30' to '-march=sm_52'

[Thomas Schwinge via Gcc-cvs]

https://gcc.gnu.org/g:d4e1f7cfdb8375c2a0076d4227a220b5e2682834

commit r15-6029-gd4e1f7cfdb8375c2a0076d4227a220b5e2682834
Author: Thomas Schwinge <tschwi...@baylibre.com>
Date:   Mon Nov 11 13:20:46 2024 +0100

    nvptx: Switch default from '-march=sm_30' to '-march=sm_52'
    
    In preparation of GCC/nvptx code changes that require sm_52 features, this
    commit raises nvptx code generation from sm_30 "Kepler" to sm_52 "Maxwell".
    The latter has been supported as of CUDA 6.5 (2014-08), and is thus 
supported
    by most Nvidia GPUs of the last decade, approximately.  (This commit doesn't
    change the use of PTX ISA 6.0, which already requires CUDA 9.0 anyway.)
    
    To continue building sm_30 multilib variants (for use via building/linking 
with
    '-march=sm_30'), specify '--with-multilib-list=default,sm_30', for example. 
 Or,
    to continue defaulting to sm_30 multilib variants, specify 
'--with-arch=sm_30'
    (plus '--without-multilib-list', if applicable).  See the documentation,
    <https://gcc.gnu.org/install/specific.html#nvptx-x-none>.
    
    (Note that after a long deprecation time, eventually the
    sm_3x "Kepler architecture support is removed from CUDA 12.0", 2022-12.)
    
            gcc/
            * config.gcc [nvptx-*]: Switch default from '-march=sm_30' to
            '-march=sm_52'.
            * doc/install.texi (Nvidia PTX Options): Update.

Diff:
---
 gcc/config.gcc       | 4 ++--
 gcc/doc/install.texi | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index a2d21b5f3436..262b38cf0e36 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -4133,7 +4133,7 @@ if test x$with_arch = x ; then
       with_arch=mips2
       ;;
     nvptx-*)
-      with_arch=sm_30
+      with_arch=sm_52
       ;;
   esac
 
@@ -5596,7 +5596,7 @@ case "${target}" in
        nvptx-*)
                supported_defaults=arch
 
-               nvptx_multilibs_default=sm_30
+               nvptx_multilibs_default=sm_52
 
                case "x${with_multilib_list}" in
                x | xno)
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index f3a0700ced43..feabf4cbe20b 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -1422,7 +1422,7 @@ is specified, then no additional multilibs are built.
 Otherwise, @var{list} is a comma separated list specifying which
 multilibs to build.
 List items are either @samp{sm_SM}, or @samp{default}, which is a
-placeholder specifying a default set of multilibs: @samp{sm_30}.
+placeholder specifying a default set of multilibs: @samp{sm_52}.
 Any duplicates are filtered out.
 If @option{--with-multilib-list} is not specified, then
 @option{--with-multilib-list=default} is assumed.
@@ -4628,7 +4628,7 @@ Use the @option{--disable-sjlj-exceptions} and
 The @option{--with-arch} option may be specified to override the
 default value for the @option{-march} option, and to also build
 corresponding target libraries.
-The default is @option{--with-arch=sm_30}.
+The default is @option{--with-arch=sm_52}.
 
 For example, if @option{--with-arch=sm_70} is specified,
 code generation defaults to @option{-march=sm_70} and