simde: New package (#19992)

* simde: New package

* remove 0.5.0.

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

@@ -0,0 +1,25 @@
+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class Simde(MesonPackage):
+    """The SIMDe header-only library provides fast, portable
+       implementations of SIMD intrinsics on hardware which doesn't
+       natively support them, such as calling SSE functions on ARM.
+       There is no performance penalty if the hardware supports the
+       native implementation (e.g., SSE/AVX runs at full speed on x86,
+       NEON on ARM, etc.)."""
+
+    homepage = "https://github.com/simd-everywhere/simde"
+    url      = "https://github.com/simd-everywhere/simde/archive/v0.6.0.tar.gz"
+    git      = "https://github.com/simd-everywhere/simde.git"
+
+    version('0.6.0', sha256='25a8b8c69c17ddc2f6209e86caa6b12d4ed91c0f841617efc56e5675eea84915')
+
+    patch('sve-gcc.patch', when='@0.6.0 %gcc')
+    conflicts('%gcc@8', when='target=a64fx',
+              msg='Internal compiler error with gcc8 and a64fx')

var/spack/repos/builtin/packages/simde/sve-gcc.patch

@@ -0,0 +1,18 @@
+diff --git a/simde/simde-features.h b/simde/simde-features.h
+index 2a3ce9c..5cfcf48 100644
+--- a/simde/simde-features.h
++++ b/simde/simde-features.h
+@@ -252,8 +252,10 @@
+ 
+ #if !defined(SIMDE_ARM_SVE_NATIVE) && !defined(SIMDE_ARM_SVE_NO_NATIVE) && !defined(SIMDE_NO_NATIVE)
+   #if defined(SIMDE_ARCH_ARM_SVE)
+-    #define SIMDE_ARM_SVE_NATIVE
+-    #include <arm_sve.h>
++    #if !defined(HEDLEY_GCC_VERSION) || HEDLEY_GCC_VERSION_CHECK(10,0,0)
++      #define SIMDE_ARM_SVE_NATIVE
++      #include <arm_sve.h>
++    #endif
+   #endif
+ #endif
+ 
+