From ae782b3d1db7a9b2dea744d2a718bec94ac57677 Mon Sep 17 00:00:00 2001
From: Thomas Schwinge <thomas@codesourcery.com>
Date: Sat, 11 Jun 2022 12:28:36 +0200
Subject: [PATCH 1/3] nvptx: Make default '-misa=sm_30' explicit

... primarily in preparation for later changes.
---
 gcc/config.gcc             | 16 ++++++++++++++++
 gcc/config/nvptx/nvptx.cc  |  4 ++++
 gcc/config/nvptx/nvptx.h   |  4 ++++
 gcc/config/nvptx/nvptx.opt |  2 +-
 4 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 16d304286d7..3b1bde78391 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -4043,6 +4043,9 @@ if test x$with_arch = x ; then
     mips*-*-vxworks)
       with_arch=mips2
       ;;
+    nvptx-*)
+      with_arch=sm_30
+      ;;
   esac
 
   # Avoid overriding --with-arch-32 and --with-arch-64 values.
@@ -5436,6 +5439,19 @@ case "${target}" in
 			esac
 		;;
 
+	nvptx-*)
+		supported_defaults=arch
+		case $with_arch in
+			sm_30 )
+				# OK; default.
+				;;
+			* )
+				echo "Unknown arch used in --with-arch=$with_arch" 1>&2
+				exit 1
+				;;
+		esac
+		;;
+
 	powerpc*-*-* | rs6000-*-*)
 		supported_defaults="abi cpu cpu_32 cpu_64 float tune tune_32 tune_64 advance_toolchain"
 
diff --git a/gcc/config/nvptx/nvptx.cc b/gcc/config/nvptx/nvptx.cc
index e4297e2d6c3..071759b9582 100644
--- a/gcc/config/nvptx/nvptx.cc
+++ b/gcc/config/nvptx/nvptx.cc
@@ -335,6 +335,10 @@ nvptx_option_override (void)
 {
   init_machine_status = nvptx_init_machine_status;
 
+  /* Via nvptx 'OPTION_DEFAULT_SPECS', '-misa' always appears on the command
+     line.  */
+  gcc_checking_assert (OPTION_SET_P (ptx_isa_option));
+
   handle_ptx_version_option ();
 
   /* Set toplevel_reorder, unless explicitly disabled.  We need
diff --git a/gcc/config/nvptx/nvptx.h b/gcc/config/nvptx/nvptx.h
index b184f1d0150..629d4a5d8bc 100644
--- a/gcc/config/nvptx/nvptx.h
+++ b/gcc/config/nvptx/nvptx.h
@@ -27,6 +27,10 @@
 
 /* Run-time Target.  */
 
+/* Use '--with-arch' for default '-misa'.  */
+#define OPTION_DEFAULT_SPECS \
+  { "arch", "%{!misa=*:-misa=%(VALUE)}" }, \
+
 /* Assembler supports '-v' option; handle similar to
    '../../gcc.cc:asm_options', 'HAVE_GNU_AS'.  */
 #define ASM_SPEC "%{v}"
diff --git a/gcc/config/nvptx/nvptx.opt b/gcc/config/nvptx/nvptx.opt
index c5a5668fce5..71d3b68510b 100644
--- a/gcc/config/nvptx/nvptx.opt
+++ b/gcc/config/nvptx/nvptx.opt
@@ -53,7 +53,7 @@ Target Mask(GOMP)
 Generate code for OpenMP offloading: enables -msoft-stack and -muniform-simt.
 
 misa=
-Target RejectNegative ToLower Joined Enum(ptx_isa) Var(ptx_isa_option) Init(PTX_ISA_SM30)
+Target RejectNegative ToLower Joined Enum(ptx_isa) Var(ptx_isa_option)
 Specify the PTX ISA target architecture to use.
 
 march=
-- 
2.25.1