i386: Fix <rounding_insn><mode>2 expander [PR95255]

2020-05-22  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:
	PR target/95255
	* config/i386/i386.md (<rounding_insn><mode>2): Do not try to
	expand non-sse4 ROUND_ROUNDEVEN rounding via SSE support routines.

gcc/testsuite/ChangeLog:
	PR target/95255
	* gcc.target/i386/pr95255.c: New test.

gcc/ChangeLog

+2020-05-22  Uroš Bizjak  <ubizjak@gmail.com>
+
+	PR target/95255
+	* config/i386/i386.md (<rounding_insn><mode>2): Do not try to
+	expand non-sse4 ROUND_ROUNDEVEN rounding via SSE support routines.
+
 2020-05-22  Jan Hubicka  <hubicka@ucw.cz>
 	* lto-streamer-out.c (lto_output_tree): Do not stream final ref if

gcc/config/i386/i386.md

@@ -17115,16 +17115,18 @@
     && (flag_fp_int_builtin_inexact || !flag_trapping_math))
    || (SSE_FLOAT_MODE_P (<MODE>mode) && TARGET_SSE_MATH
        && (TARGET_SSE4_1
-	  || (ROUND_<ROUNDING> != ROUND_ROUNDEVEN
-	      && (flag_fp_int_builtin_inexact || !flag_trapping_math))))"
+	   || (ROUND_<ROUNDING> != ROUND_ROUNDEVEN
+	       && (flag_fp_int_builtin_inexact || !flag_trapping_math))))"
 {
   if (SSE_FLOAT_MODE_P (<MODE>mode) && TARGET_SSE_MATH
-      && (TARGET_SSE4_1 || flag_fp_int_builtin_inexact || !flag_trapping_math))
+      && (TARGET_SSE4_1
+	  || (ROUND_<ROUNDING> != ROUND_ROUNDEVEN
+	      && (flag_fp_int_builtin_inexact || !flag_trapping_math))))
     {
       if (TARGET_SSE4_1)
 	emit_insn (gen_sse4_1_round<mode>2
-		   (operands[0], operands[1], GEN_INT (ROUND_<ROUNDING>
-						       | ROUND_NO_EXC)));
+		   (operands[0], operands[1],
+		    GEN_INT (ROUND_<ROUNDING> | ROUND_NO_EXC)));
       else if (TARGET_64BIT || (<MODE>mode != DFmode))
 	{
 	  if (ROUND_<ROUNDING> == ROUND_FLOOR)

gcc/testsuite/ChangeLog

+2020-05-22  Uroš Bizjak  <ubizjak@gmail.com>
+
+	PR target/95255
+	* gcc.target/i386/pr95255.c: New test.
+
 2020-05-22  Hongtao.liu  <hongtao.liu@intel.com>
 	* gcc.target/i386/pr92658-avx512f.c: New test.

gcc/testsuite/gcc.target/i386/pr95255.c

+/* PR target/95255 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -msse2 -mno-sse4.1 -mfpmath=both" } */
+
+double foo (double x)
+{
+  return __builtin_roundeven (x);
+}