Provide a frontend based error for always_inline functions that require

target features that the caller function doesn't provide. This matches
the existing backend failure to inline functions that don't have
matching target features - and diagnoses earlier in the case of
always_inline.

Fix up a few test cases that were, in fact, invalid if you tried
to generate code from the backend with the specified target features
and add a couple of tests to illustrate what's going on.

This should fix PR25246.

llvm-svn: 252834

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/test/CodeGen/target-features-error-2.c b/clang/test/CodeGen/target-features-error-2.c
new file mode 100644
index 00000000000..66b8a46a4df
--- /dev/null
+++ b/clang/test/CodeGen/target-features-error-2.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 %s -triple=x86_64-linux-gnu -S -verify -o -
+#define __MM_MALLOC_H
+#include <x86intrin.h>
+
+int baz(__m256i a) {
+  return _mm256_extract_epi32(a, 3); // expected-error {{function 'baz' and always_inline callee function '_mm256_extract_epi32' are required to have matching target features}}
+}