[X86] Add __builtin_ia32_selectss_128 and __builtin_ia32_selectsd_128 that is suitable for use in scalar mask intrinsics.

This will convert the i8 mask argument to <8 x i1> and extract an i1 and then emit a select instruction. This replaces the '(__U & 1)" and ternary operator used in some of intrinsics. The old sequence was lowered to a scalar and and compare. The new sequence uses an i1 vector that will interoperate better with other mask intrinsics.

This removes the need to handle div_ss/sd specially in CGBuiltin.cpp. A follow up patch will add the GCCBuiltin name back in llvm and remove the custom handling.

I made some adjustments to legacy move_ss/sd intrinsics which we reused here to do a simpler extract and insert instead of 2 extracts and two inserts or a shuffle.

llvm-svn: 336622

1 files changed, 2 insertions, 1 deletions

diff --git a/clang/test/CodeGen/sse-builtins.c b/clang/test/CodeGen/sse-builtins.c
index b7c7a7fc7e4..e9801487be0 100644
--- a/clang/test/CodeGen/sse-builtins.c
+++ b/clang/test/CodeGen/sse-builtins.c
@@ -450,7 +450,8 @@ __m128 test_mm_min_ss(__m128 A, __m128 B) {
 
 __m128 test_mm_move_ss(__m128 A, __m128 B) {
   // CHECK-LABEL: test_mm_move_ss
-  // CHECK: shufflevector <4 x float> %{{.*}}, <4 x float> %{{.*}}, <4 x i32> <i32 4, i32 1, i32 2, i32 3>
+  // CHECK: extractelement <4 x float> %{{.*}}, i32 0
+  // CHECK: insertelement <4 x float> %{{.*}}, float %{{.*}}, i32 0
   return _mm_move_ss(A, B);
 }