[gcc r12-7889] [nvptx] Add march alias for misa

[gcc r12-7889] [nvptx] Add march alias for misa

[Tom de Vries]

https://gcc.gnu.org/g:c5db32a143604f44672cfe312ffc6edfd5c86a4a

commit r12-7889-gc5db32a143604f44672cfe312ffc6edfd5c86a4a
Author: Tom de Vries <tdevries@suse.de>
Date:   Tue Mar 29 10:31:51 2022 +0200

    [nvptx] Add march alias for misa
    
    The target option misa has the following description:
    ...
    $ gcc --target-help 2>&1 | grep misa
      -misa=                      Specify the PTX ISA target architecture to use.
    ...
    
    The name misa is somewhat poorly chosen.  It suggests that for a use
    -misa=sm_30, sm_30 is the name of a specific Instruction Set Architecture.
    Instead, sm_30 is the name of a specific target architecture in the generic
    PTX Instruction Set Architecture.
    
    Futhermore, there's mptx, which also has ISA in the description:
    ...
      -mptx=                      Specify the PTX ISA version to use.
    ...
    
    Add the more intuitive alias march for misa:
    ...
    $ gcc --target-help 2>&1 | grep march
      -march=                     Alias:  Same as -misa=.
    ...
    
    Tested on nvptx.
    
    gcc/ChangeLog:
    
    2022-03-29  Tom de Vries  <tdevries@suse.de>
    
            * config/nvptx/nvptx.opt (march): Add alias of misa.
    
    gcc/testsuite/ChangeLog:
    
    2022-03-29  Tom de Vries  <tdevries@suse.de>
    
            * gcc.target/nvptx/main.c: New test.
            * gcc.target/nvptx/march.c: New test.

Diff:
---
 gcc/config/nvptx/nvptx.opt             | 4 ++++
 gcc/testsuite/gcc.target/nvptx/main.c  | 7 +++++++
 gcc/testsuite/gcc.target/nvptx/march.c | 5 +++++
 3 files changed, 16 insertions(+)

diff --git a/gcc/config/nvptx/nvptx.opt b/gcc/config/nvptx/nvptx.opt
index 1f684ed8860..b5d0170e9e9 100644
--- a/gcc/config/nvptx/nvptx.opt
+++ b/gcc/config/nvptx/nvptx.opt
@@ -56,6 +56,10 @@ misa=
 Target RejectNegative ToLower Joined Enum(ptx_isa) Var(ptx_isa_option) Init(PTX_ISA_SM30)
 Specify the PTX ISA target architecture to use.
 
+march=
+Target RejectNegative Joined Alias(misa=)
+Alias:
+
 Enum
 Name(ptx_version) Type(int)
 Known PTX ISA versions (for use with the -mptx= option):
diff --git a/gcc/testsuite/gcc.target/nvptx/main.c b/gcc/testsuite/gcc.target/nvptx/main.c
new file mode 100644
index 00000000000..3af2b575842
--- /dev/null
+++ b/gcc/testsuite/gcc.target/nvptx/main.c
@@ -0,0 +1,7 @@
+/* { dg-do link } */
+
+int
+main (void)
+{
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/nvptx/march.c b/gcc/testsuite/gcc.target/nvptx/march.c
new file mode 100644
index 00000000000..ec91f21c903
--- /dev/null
+++ b/gcc/testsuite/gcc.target/nvptx/march.c
@@ -0,0 +1,5 @@
+/* { dg-options "-march=sm_30"} */
+
+#include "main.c"
+
+/* { dg-final { scan-assembler-times "\\.target\tsm_30" 1 } } */