patch-r266674-clang-r209489-fix-xmmintrin.diff revision 283015 
1Pull in r209489 from upstream clang trunk (by Akira Hatanaka):
2
3  Fix a bug in xmmintrin.h.
4
5  The last step of _mm_cvtps_pi16 should use _mm_packs_pi32, which is a function
6  that reads two __m64 values and packs four 32-bit values into four 16-bit
7  values.  
8
9  <rdar://problem/16873717>
10
11Pull in r209559 from upstream clang trunk (by Akira Hatanaka):
12
13  Recommit r209532 with -ffreestanding.
14
15  This is a test case for r209489.
16
17Introduced here: http://svnweb.freebsd.org/changeset/base/266674
18
19Index: tools/clang/lib/Headers/xmmintrin.h
20===================================================================
21--- tools/clang/lib/Headers/xmmintrin.h
22+++ tools/clang/lib/Headers/xmmintrin.h
23@@ -903,7 +903,7 @@ _mm_cvtps_pi16(__m128 __a)
24   __a = _mm_movehl_ps(__a, __a);
25   __c = _mm_cvtps_pi32(__a);
26   
27-  return _mm_packs_pi16(__b, __c);
28+  return _mm_packs_pi32(__b, __c);
29 }
30 
31 static __inline__ __m64 __attribute__((__always_inline__, __nodebug__))
32Index: tools/clang/test/Headers/xmmintrin.c
33===================================================================
34--- tools/clang/test/Headers/xmmintrin.c
35+++ tools/clang/test/Headers/xmmintrin.c
36@@ -0,0 +1,13 @@
37+// RUN: %clang_cc1 %s -ffreestanding -triple x86_64-apple-macosx10.9.0 -emit-llvm -o - | FileCheck %s
38+
39+#include <xmmintrin.h>
40+
41+// Make sure the last step of _mm_cvtps_pi16 converts <4 x i32> to <4 x i16> by
42+// checking that clang emits PACKSSDW instead of PACKSSWB.
43+
44+// CHECK: define i64 @test_mm_cvtps_pi16
45+// CHECK: call x86_mmx @llvm.x86.mmx.packssdw
46+
47+__m64 test_mm_cvtps_pi16(__m128 a) {
48+  return _mm_cvtps_pi16(a);
49+}
50