vdt: simplified recipe by removing SIMD variants (#12954)

Now the support for SSE3 or AVX is tested on the selected target

var/spack/repos/builtin/packages/vdt/package.py

@@ -3,16 +3,14 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from spack import *
-from spack.spec import ConflictsInSpecError
-
 
 class Vdt(CMakePackage):
     """Vectorised math. A collection of fast and inline implementations of
-    mathematical functions."""
+    mathematical functions.
+    """
 
     homepage = "https://github.com/dpiparo/vdt"
-    url      = "https://github.com/dpiparo/vdt/archive/v0.3.9.tar.gz"
+    url = "https://github.com/dpiparo/vdt/archive/v0.3.9.tar.gz"
 
     version('0.4.3', sha256='705674612ebb5c182b65a8f61f4d173eb7fe7cdeee2235b402541a492e08ace1')
     version('0.3.9', '80a2d73a82f7ef8257a8206ca22dd145')
@@ -20,50 +18,6 @@ class Vdt(CMakePackage):
     version('0.3.7', 'd2621d4c489894fd1fe8e056d9a0a67c')
     version('0.3.6', '6eaff3bbbd5175332ccbd66cd71a741d')
 
-    simd_x86 = ('sse', 'avx', 'avx2', 'fma')
-    simd_all = ('sse', 'avx', 'avx2', 'fma', 'neon')
-    variant(
-        'simd',
-        default='None',
-        values=simd_all,
-        description='USE simd instruction set',
-        multi=True
-    )
-
-    def flag_handler(self, name, flags):
-        arch = ''
-        spec = self.spec
-        if spec.satisfies("platform=cray"):
-            # FIXME; It is assumed that cray is x86_64.
-            # If you support arm on cray, you need to fix it.
-            arch = 'x86_64'
-        if arch != 'x86_64' and not spec.satisfies("target=x86_64:"):
-            for s in self.simd_x86:
-                if (spec.satisfies("simd={0}".format(s))):
-                    raise ConflictsInSpecError(
-                        spec,
-                        [(
-                            spec,
-                            spec.architecture.target,
-                            spec.variants['simd'],
-                            'simd=sse,avx,avx2 and fma are valid'
-                            ' only on x86_64'
-                        )]
-                    )
-        # FIXME: It is assumed that arm 32 bit target is arm.
-        if arch != 'arm' and not spec.satisfies("target=arm"):
-            if spec.satisfies("simd=neon"):
-                raise ConflictsInSpecError(
-                    spec,
-                    [(
-                        spec,
-                        spec.architecture.target,
-                        spec.variants['simd'],
-                        'simd=neon is valid only on arm 32 bit'
-                    )]
-                )
-        return (flags, None, None)
-
     @property
     def build_directory(self):
         d = join_path(self.stage.path, 'spack-build')
@@ -73,10 +27,9 @@ def build_directory(self):
 
     def cmake_args(self):
         options = []
-
-        for s in self.simd_all:
-            options.append(
-                "-D{0}=".format(s.upper()) +
-                ("ON" if (s in self.spec.variants['simd'].value) else "OFF")
-            )
+        for simd_feature in ('sse', 'avx', 'avx2', 'fma', 'neon'):
+            options.append("-D{0}={1}".format(
+                simd_feature.upper(),
+                "ON" if simd_feature in self.spec.target else "OFF"
+            ))
         return options