[AVX-512ER] vrcp28ps auto generation

gcc/
	* config/i386/i386.c (ix86_emit_swdivsf): Emit vrcp28ps.
gcc/testsuite/
	* gcc.target/i386/avx512er-vrcp28ps-3.c: New test.
	* gcc.target/i386/avx512er-vrcp28ps-4.c: New test.

From-SVN: r237648

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 26e8057db25bdd8a7159405ad0e7d59abf0715e4..dacf8c16fe989312b5f2ea585c62584222ef1731 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2016-06-21  Ilya Verbin  <ilya.verbin@intel.com>
+
+       * config/i386/i386.c (ix86_emit_swdivsf): Emit vrcp28ps.
+
 2016-06-21  H.J. Lu  <hongjiu.lu@intel.com>
            Ilya Enkovich  <ilya.enkovich@intel.com>
 

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 17664ff9f17af9f439001fa6155cb1b5148d08e4..8139807512b50932c3011fcb121e50c89e1c626c 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -48726,8 +48726,19 @@ void ix86_emit_swdivsf (rtx res, rtx a, rtx b, machine_mode mode)
 
   /* x0 = rcp(b) estimate */
   if (mode == V16SFmode || mode == V8DFmode)
-    emit_insn (gen_rtx_SET (x0, gen_rtx_UNSPEC (mode, gen_rtvec (1, b),
-                                               UNSPEC_RCP14)));
+    {
+      if (TARGET_AVX512ER)
+       {
+         emit_insn (gen_rtx_SET (x0, gen_rtx_UNSPEC (mode, gen_rtvec (1, b),
+                                                     UNSPEC_RCP28)));
+         /* res = a * x0 */
+         emit_insn (gen_rtx_SET (res, gen_rtx_MULT (mode, a, x0)));
+         return;
+       }
+      else
+       emit_insn (gen_rtx_SET (x0, gen_rtx_UNSPEC (mode, gen_rtvec (1, b),
+                                                   UNSPEC_RCP14)));
+    }
   else
     emit_insn (gen_rtx_SET (x0, gen_rtx_UNSPEC (mode, gen_rtvec (1, b),
                                                UNSPEC_RCP)));

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index cfee40b7572cf5f567944e34bfa8eed649aa7602..cff25cc1979873d7970a96da4edb9d6beff2e1f0 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-06-21  Ilya Verbin  <ilya.verbin@intel.com>
+
+       * gcc.target/i386/avx512er-vrcp28ps-3.c: New test.
+       * gcc.target/i386/avx512er-vrcp28ps-4.c: New test.
+
 2016-06-21  H.J. Lu  <hongjiu.lu@intel.com>
 
        PR target/71549

diff --git a/gcc/testsuite/gcc.target/i386/avx512er-vrcp28ps-3.c b/gcc/testsuite/gcc.target/i386/avx512er-vrcp28ps-3.c
new file mode 100644 (file)
index 0000000..e08bea4
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/avx512er-vrcp28ps-3.c
@@ -0,0 +1,50 @@
+/* { dg-do run } */
+/* { dg-require-effective-target avx512er } */
+/* { dg-options "-O2 -ffast-math -ftree-vectorize -mavx512er" } */
+
+#include "avx512er-check.h"
+
+#define MAX 1000
+#define EPS 0.00001
+
+__attribute__ ((noinline, optimize (0)))
+void static
+compute_rcp_ref (float *a, float *b, float *r)
+{
+  for (int i = 0; i < MAX; i++)
+    r[i] = a[i] / b[i];
+}
+
+__attribute__ ((noinline))
+void static
+compute_rcp_exp (float *a, float *b, float *r)
+{
+  for (int i = 0; i < MAX; i++)
+    r[i] = a[i] / b[i];
+}
+
+void static
+avx512er_test (void)
+{
+  float a[MAX];
+  float b[MAX];
+  float ref[MAX];
+  float exp[MAX];
+
+  for (int i = 0; i < MAX; i++)
+    {
+      a[i] = 179.345 - 6.5645 * i;
+      b[i] = 8765.987 - 8.6756 * i;
+    }
+
+  compute_rcp_ref (a, b, ref);
+  compute_rcp_exp (a, b, exp);
+
+  for (int i = 0; i < MAX; i++)
+    {
+      float rel_err = (ref[i] - exp[i]) / ref[i];
+      rel_err = rel_err > 0.0 ? rel_err : -rel_err;
+      if (rel_err > EPS)
+       abort ();
+    }
+}

diff --git a/gcc/testsuite/gcc.target/i386/avx512er-vrcp28ps-4.c b/gcc/testsuite/gcc.target/i386/avx512er-vrcp28ps-4.c
new file mode 100644 (file)
index 0000000..2c76d96
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/avx512er-vrcp28ps-4.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ffast-math -ftree-vectorize -mavx512er" } */
+
+#include "avx512er-vrcp28ps-3.c"
+
+/* { dg-final { scan-assembler-times "vrcp28ps\[^\n\r\]*zmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 } } */