[PATCH] [avx512fp16] Refine HImode movement for "v" to "v".

[liuhongt via Gcc-patches]

Set attr from HImode to HFmode which uses vmovsh instead of vmovw for
movment between sse registers.

Bootstrapped and regstested on x86_64-pc-linux-gnu{-m32,}.
Ok for main trunk?

gcc/ChangeLog:

        PR target/104974
        * config/i386/i386.md (*movhi_internal): Set attr type from HI
        to HF for alternative 12 under TARGET_AVX512FP16.

gcc/testsuite/ChangeLog:

        * gcc.target/i386/pr104974.c: New test.
---
 gcc/config/i386/i386.md                  |  2 +-
 gcc/testsuite/gcc.target/i386/pr104974.c | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/pr104974.c

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index c8fbf605e41..42aa0e1d998 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -2658,7 +2658,7 @@ (define_insn "*movhi_internal"
                    (const_string "TI"))
            (eq_attr "alternative" "12")
              (cond [(match_test "TARGET_AVX512FP16")
-                      (const_string "HI")
+                      (const_string "HF")
                     (match_test "TARGET_AVX")
                       (const_string "TI")
                     (ior (not (match_test "TARGET_SSE2"))
diff --git a/gcc/testsuite/gcc.target/i386/pr104974.c 
b/gcc/testsuite/gcc.target/i386/pr104974.c
new file mode 100644
index 00000000000..d1f2b1a9722
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr104974.c
@@ -0,0 +1,12 @@
+/* { dg-do assemble { target avx512fp16 } } */
+/* { dg-options "-mavx512fp16 -O2" } */
+
+short
+foo (short a)
+{
+  register short b __asm ("%xmm1") = a;
+  asm volatile ("": "+v" (b));
+  register short c __asm ("%xmm2") = b;
+  asm volatile ("": "+v" (c));
+  return a;
+}
-- 
2.18.1