re PR target/91323 (LTGT rtx produces UCOMISS instead of COMISS)

	PR target/91323
	* config/i386/i386-expand.c (ix86_unordered_fp_compare) <case LTGT>:
	Return false.

testsuite/ChangeLog:

	PR target/91323
	* gcc.dg/torture/pr91323.c: New test.

From-SVN: r274005

gcc/ChangeLog

+2019-08-02  Uroš Bizjak  <ubizjak@gmail.com>
+
+	PR target/91323
+	* config/i386/i386-expand.c (ix86_unordered_fp_compare) <case LTGT>:
+	Return false.
+
 2019-08-02  Richard Biener  <rguenther@suse.de>
 
 	* vec.h (vec::sort): Add gcc_qsort_r support.

gcc/config/i386/i386-expand.c

@@ -2286,16 +2286,16 @@ ix86_unordered_fp_compare (enum rtx_code code)
 
   switch (code)
     {
-    case GT:
-    case GE:
     case LT:
     case LE:
+    case GT:
+    case GE:
+    case LTGT:
       return false;
 
     case EQ:
     case NE:
 
-    case LTGT:
     case UNORDERED:
     case ORDERED:
     case UNLT:

gcc/testsuite/ChangeLog

+2019-08-02  Uroš Bizjak  <ubizjak@gmail.com>
+
+	PR target/91323
+	* gcc.dg/torture/pr91323.c: New test.
+
 2019-08-02  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* g++.dg/cpp1z/nodiscard6.C: New.

gcc/testsuite/gcc.dg/torture/pr91323.c

+/* { dg-do run } */
+/* { dg-add-options ieee } */
+/* { dg-require-effective-target fenv_exceptions } */
+
+#include <fenv.h>
+
+int
+__attribute__ ((noinline, noclone))
+f1 (float a, float b)
+{
+  return __builtin_isless (a, b) || __builtin_isgreater (a, b);
+}
+
+int
+__attribute__ ((noinline, noclone))
+f2 (float a, float b)
+{
+  return __builtin_islessgreater (a, b);
+}
+
+int
+__attribute__ ((noinline, noclone))
+f3 (float a, float b)
+{
+  return a < b || a > b;
+}
+
+int
+main (void)
+{
+  volatile int r;
+
+  float nanf = __builtin_nanf ("");
+  float argf = 1.0f;
+
+  feclearexcept (FE_INVALID);
+
+  r = f1 (nanf, argf);
+  if (fetestexcept (FE_INVALID))
+    __builtin_abort ();
+
+  r = f2 (nanf, argf);
+  if (fetestexcept (FE_INVALID))
+    __builtin_abort ();
+
+  r = f3 (nanf, argf);
+  if (!fetestexcept (FE_INVALID))
+    __builtin_abort ();
+
+  return 0;
+}