[PATCH] D11753: [X86] Add support for _MM_ALIGN16

[Michael Kuperstein]

mkuper created this revision.
mkuper added reviewers: majnemer, echristo.
mkuper added a subscriber: cfe-commits.

Both MSVC and ICC define this in xmmintrin.h, so, in terms of compatibility, I'd prefer to have it there in clang as well, even though it's MS-specific.

http://reviews.llvm.org/D11753

Files:
  lib/Headers/xmmintrin.h
  test/CodeGen/ms-mm-align.c
  test\CodeGen\ms-mm-align.c

Index: lib/Headers/xmmintrin.h
===================================================================
--- lib/Headers/xmmintrin.h
+++ lib/Headers/xmmintrin.h
@@ -924,6 +924,11 @@
   return __builtin_ia32_movmskps(__a);
 }
 
+
+#ifdef _MSC_VER
+#define _MM_ALIGN16 __declspec(align(16))
+#endif
+
 #define _MM_SHUFFLE(z, y, x, w) (((z) << 6) | ((y) << 4) | ((x) << 2) | (w))
 
 #define _MM_EXCEPT_INVALID    (0x0001)
Index: test/CodeGen/ms-mm-align.c
===================================================================
--- test/CodeGen/ms-mm-align.c
+++ test/CodeGen/ms-mm-align.c
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -ffreestanding -fms-extensions -fms-compatibility -fms-compatibility-version=17.00 \
+// RUN:         -triple i686--windows -Oz -emit-llvm %s -o - \
+// RUN:         | FileCheck %s -check-prefix CHECK
+
+// Intrin.h needs size_t, but -ffreestanding prevents us from getting it from
+// stddef.h.  Work around it with this typedef.
+typedef __SIZE_TYPE__ size_t;
+#include <Intrin.h>
+
+void capture_ptr(int* i);
+void test_mm_align16(int p) {
+  _MM_ALIGN16 int i;
+  capture_ptr(&i);
+}
+
+// CHECK: alloca i32, align 16


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