re PR target/84827 (ICE in extract_insn, at recog.c:2311)

	PR target/84827
	* config/i386/i386.md (round<mode>2): For 387 fancy math, disable
	pattern if -ftrapping-math -fno-fp-int-builtin-inexact.

	* gcc.target/i386/pr84827.c: New test.

From-SVN: r258477

gcc/ChangeLog

 2018-03-13  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/84827
+	* config/i386/i386.md (round<mode>2): For 387 fancy math, disable
+	pattern if -ftrapping-math -fno-fp-int-builtin-inexact.
+
 	PR target/84828
 	* reg-stack.c (change_stack): Change update_end var from int to
 	rtx_insn *, if non-NULL don't update just BB_END (current_block), but

gcc/config/i386/i386.md

@@ -16311,7 +16311,8 @@
   "(TARGET_USE_FANCY_MATH_387
     && (!(SSE_FLOAT_MODE_P (<MODE>mode) && TARGET_SSE_MATH)
 	|| TARGET_MIX_SSE_I387)
-    && flag_unsafe_math_optimizations)
+    && flag_unsafe_math_optimizations
+    && (flag_fp_int_builtin_inexact || !flag_trapping_math))
    || (SSE_FLOAT_MODE_P (<MODE>mode) && TARGET_SSE_MATH
        && !flag_trapping_math && !flag_rounding_math)"
 {

gcc/testsuite/ChangeLog

 2018-03-13  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/84827
+	* gcc.target/i386/pr84827.c: New test.
+
 	PR target/84828
 	* g++.dg/ext/pr84828.C: New test.
 

gcc/testsuite/gcc.target/i386/pr84827.c

+/* PR target/84827 */
+/* { dg-do compile } */
+/* { dg-options "-Ofast -fno-fp-int-builtin-inexact -ftrapping-math -fno-associative-math -mfpmath=387" } */
+
+double
+f1 (double a)
+{
+  return __builtin_round (a);
+}
+
+float
+f2 (float a)
+{
+  return __builtin_roundf (a);
+}
+
+long double
+f3 (long double a)
+{
+  return __builtin_roundl (a);
+}