cmake: only display the result of checking nasm once

if nasm is able to emit AVX512 instructions, we can assume that it's
able to generate AVX2 instructions as well. so no need to print "Found
nasm" multiple times.

and by chaining mutual exclusive branches with "elseif", we can have
better readability.

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/cmake/modules/CheckNasm.cmake b/cmake/modules/CheckNasm.cmake
index 8ec728edc2fd8f69fc937c64e75dfef40c82adba..8a45bf38bfbc5c94d5d92368672e04c05e84ee25 100644 (file)
--- a/cmake/modules/CheckNasm.cmake
+++ b/cmake/modules/CheckNasm.cmake
@@ -26,7 +26,7 @@ macro(check_nasm_support _object_format _support_x64 _support_x64_and_avx2 _supp
           ERROR_QUIET)
         if(NOT rc)
           set(${_support_x64_and_avx2} TRUE)
-        endif(NOT rc)
+        endif()
         execute_process(COMMAND nasm -D HAVE_AS_KNOWS_AVX512 -f ${object_format}
           -i ${CMAKE_SOURCE_DIR}/src/isa-l/include/
           ${CMAKE_SOURCE_DIR}/src/isa-l/erasure_code/gf_vect_dot_prod_avx512.asm
@@ -36,7 +36,7 @@ macro(check_nasm_support _object_format _support_x64 _support_x64_and_avx2 _supp
           ERROR_QUIET)
         if(NOT rt)
           set(${_support_x64_and_avx512} TRUE)
-        endif(NOT rt)
+        endif()
       endif(${_support_x64})
     endif(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64")
   endif(NOT no_nasm)
@@ -44,14 +44,11 @@ macro(check_nasm_support _object_format _support_x64 _support_x64_and_avx2 _supp
     message(STATUS "Could NOT find nasm")
   elseif(NOT ${_support_x64})
     message(STATUS "Found nasm: but x86_64 with x32 ABI is not supported")
-  endif()
-  if(${_support_x64_and_avx512})
+  elseif(${_support_x64_and_avx512})
     message(STATUS "Found nasm: best -- capable of assembling AVX512")
-  endif()
-  if(${_support_x64_and_avx2})
+  elseif(${_support_x64_and_avx2})
     message(STATUS "Found nasm: better -- capable of assembling AVX2")
-  endif()
-  if(${_support_x64})
+  elseif(${_support_x64})
     message(STATUS "Found nasm: good -- capable of assembling x86_64")
   endif()
 endmacro()