[PATCH] i386: Add missing vector truncate patterns [PR92658].

[liuhongt via Gcc-patches]

Add missing insn patterns for v2si -> v2hi/v2qi and v2hi-> v2qi vector
truncate.

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

gcc/ChangeLog:

        PR target/92658
        * config/i386/mmx.md (truncv2hiv2qi2): New define_insn.
        (truncv2si<mode>2): Ditto.

gcc/testsuite/ChangeLog:

        * gcc.target/i386/pr92658-avx512bw-trunc-2.c: New test.
---
 gcc/config/i386/mmx.md                        | 21 +++++++++++++++
 .../i386/pr92658-avx512bw-trunc-2.c           | 27 +++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/i386/pr92658-avx512bw-trunc-2.c

diff --git a/gcc/config/i386/mmx.md b/gcc/config/i386/mmx.md
index dbcb850ffde..bb45098f797 100644
--- a/gcc/config/i386/mmx.md
+++ b/gcc/config/i386/mmx.md
@@ -3667,6 +3667,27 @@ (define_expand "<insn>v2qiv2hi2"
   DONE;
 })
 
+(define_insn "truncv2hiv2qi2"
+  [(set (match_operand:V2QI 0 "register_operand" "=v")
+       (truncate:V2QI
+         (match_operand:V2HI 1 "register_operand" "v")))]
+  "TARGET_AVX512VL && TARGET_AVX512BW"
+  "vpmovwb\t{%1, %0|%0, %1}"
+  [(set_attr "type" "ssemov")
+   (set_attr "prefix" "evex")
+   (set_attr "mode" "TI")])
+
+(define_mode_iterator V2QI_V2HI [V2QI V2HI])
+(define_insn "truncv2si<mode>2"
+  [(set (match_operand:V2QI_V2HI 0 "register_operand" "=v")
+       (truncate:V2QI_V2HI
+         (match_operand:V2SI 1 "register_operand" "v")))]
+  "TARGET_AVX512VL && TARGET_MMX_WITH_SSE"
+  "vpmovd<mmxvecsize>\t{%1, %0|%0, %1}"
+  [(set_attr "type" "ssemov")
+   (set_attr "prefix" "evex")
+   (set_attr "mode" "TI")])
+
 ;; Pack/unpack vector modes
 (define_mode_attr mmxpackmode
   [(V4HI "V8QI") (V2SI "V4HI")])
diff --git a/gcc/testsuite/gcc.target/i386/pr92658-avx512bw-trunc-2.c 
b/gcc/testsuite/gcc.target/i386/pr92658-avx512bw-trunc-2.c
new file mode 100644
index 00000000000..2f5b7dc5668
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr92658-avx512bw-trunc-2.c
@@ -0,0 +1,27 @@
+/* PR target/92658 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx512bw -mavx512vl" } */
+/* { dg-final { scan-assembler-times "vpmovwb" 1 } } */
+/* { dg-final { scan-assembler-times "vpmovdb" 1 { target { ! ia32 } } } } */
+/* { dg-final { scan-assembler-times "vpmovdw" 1 { target { ! ia32 } } } } */
+
+void
+foo (int* __restrict a, char* b)
+{
+    b[0] = a[0];
+    b[1] = a[1];
+}
+
+void
+foo2 (short* __restrict a, char* b)
+{
+    b[0] = a[0];
+    b[1] = a[1];
+}
+
+void
+foo3 (int* __restrict a, short* b)
+{
+    b[0] = a[0];
+    b[1] = a[1];
+}
-- 
2.39.1.388.g2fc9e9ca3c