[llvm] bb09588 - [Support/BLAKE3] Do a CMake check for the `-mavx512vl` flag before applying it

[Argyrios Kyrtzidis via llvm-commits]

Author: Argyrios Kyrtzidis
Date: 2022-06-20T22:04:14-07:00
New Revision: bb095880f87d6b9c2aadc3aaaf159e25b739f29d

URL: https://github.com/llvm/llvm-project/commit/bb095880f87d6b9c2aadc3aaaf159e25b739f29d
DIFF: https://github.com/llvm/llvm-project/commit/bb095880f87d6b9c2aadc3aaaf159e25b739f29d.diff

LOG: [Support/BLAKE3] Do a CMake check for the `-mavx512vl` flag before applying it

Added: 
    

Modified: 
    llvm/lib/Support/BLAKE3/CMakeLists.txt

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Support/BLAKE3/CMakeLists.txt b/llvm/lib/Support/BLAKE3/CMakeLists.txt
index 142e8c68d052..df1805918587 100644
--- a/llvm/lib/Support/BLAKE3/CMakeLists.txt
+++ b/llvm/lib/Support/BLAKE3/CMakeLists.txt
@@ -70,10 +70,13 @@ if (CAN_USE_ASSEMBLER)
         blake3_avx2_x86-64_unix.S
         blake3_avx512_x86-64_unix.S
       )
-      # Clang-6 needs this flag. We also suppress '-Wunused-command-line-argument'
-      # in case the file is included with arm architecture.
-      set_source_files_properties(blake3_avx512_x86-64_unix.S
-        PROPERTIES COMPILE_OPTIONS "-mavx512vl;-Wno-unused-command-line-argument")
+      check_c_compiler_flag("-mavx512vl" SUPPORTS_avx512vl)
+      if (SUPPORTS_avx512vl)
+        # Clang-6 needs this flag. We also suppress '-Wunused-command-line-argument'
+        # in case the file is included with arm architecture.
+        set_source_files_properties(blake3_avx512_x86-64_unix.S
+          PROPERTIES COMPILE_OPTIONS "-mavx512vl;-Wno-unused-command-line-argument")
+      endif()
     endif()
   endif()
 else()