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[sfnt] Support Intel compilers.

* src/sfnt/pngshim.c (premultiply_data): Intel compilers do not
currently support `__builtin_shuffle'.

git/fs: mount .git/fs: mount/attach disallowed

--- a/ChangeLog

+++ b/ChangeLog

@@ -1,3 +1,10 @@

+2020-06-19  Stephen McDowell  <svenevs.dev@gmail.com>

+

+	[sfnt] Support Intel compilers.

+

+	* src/sfnt/pngshim.c (premultiply_data): Intel compilers do not

+	currently support `__builtin_shuffle'.

+

 2020-06-19  Sebastian Rasmussen  <sebras@gmail.com>

 	[base] Fix memory leak (#58611).

--- a/src/sfnt/pngshim.c

+++ b/src/sfnt/pngshim.c

@@ -60,7 +60,12 @@

     /* predates clang; the `__BYTE_ORDER__' preprocessor symbol was */

     /* introduced in gcc 4.6 and clang 3.2, respectively.           */

     /* `__builtin_shuffle' for gcc was introduced in gcc 4.7.0.     */

-#if ( ( defined( __GNUC__ )                                &&             \

+    /*                                                              */

+    /* Intel compilers do not currently support __builtin_shuffle;  */

+

+    /* The Intel check must be first. */

+#if !defined( __INTEL_COMPILER )                                       && \

+    ( ( defined( __GNUC__ )                                &&             \

         ( ( __GNUC__ >= 5 )                              ||               \

         ( ( __GNUC__ == 4 ) && ( __GNUC_MINOR__ >= 7 ) ) ) )         ||   \

       ( defined( __clang__ )                                       &&     \