re PR tree-optimization/61335 (wrong code with -O2 -fbounds-check)

2014-05-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/61335
	* tree-vrp.c (vrp_visit_phi_node): If the compare of old and
	new range fails, drop to varying.

	* gfortran.dg/pr61335.f90: New testcase.

From-SVN: r211012

gcc/ChangeLog

+2014-05-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/61335
+	* tree-vrp.c (vrp_visit_phi_node): If the compare of old and
+	new range fails, drop to varying.
+
 2014-05-28  Tom de Vries  <tom@codesourcery.com>
 
 	* lra-int.h (struct lra_reg): Add field actual_call_used_reg_set.

gcc/testsuite/ChangeLog

+2014-05-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/61335
+	* gfortran.dg/pr61335.f90: New testcase.
+
 2014-05-27  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/aliasing1.adb (dg-final): Robustify pattern matching.

gcc/testsuite/gfortran.dg/pr61335.f90

+! { dg-do run }
+! { dg-additional-options "-fbounds-check" }
+MODULE cp_units
+
+  INTEGER, PARAMETER :: default_string_length=80, dp=KIND(0.0D0)
+
+  LOGICAL, PRIVATE, PARAMETER          :: debug_this_module=.TRUE.
+  CHARACTER(len=*), PARAMETER, PRIVATE :: moduleN = 'cp_units'
+  INTEGER, SAVE, PRIVATE               :: last_unit_id=0, last_unit_set_id=0
+
+  INTEGER, PARAMETER, PUBLIC :: cp_unit_max_kinds=8, cp_unit_basic_desc_length=15,&
+       cp_unit_desc_length=cp_unit_max_kinds*cp_unit_basic_desc_length, cp_ukind_max=9
+
+CONTAINS
+
+  FUNCTION cp_to_string(i) RESULT(res)
+    INTEGER, INTENT(in)                      :: i
+    CHARACTER(len=6)                         :: res
+
+    INTEGER                                  :: iostat
+    REAL(KIND=dp)                            :: tmp_r
+
+    IF (i>999999 .OR. i<-99999) THEN
+       tmp_r=i
+       WRITE (res,fmt='(es6.1)',iostat=iostat) tmp_r
+    ELSE
+       WRITE (res,fmt='(i6)',iostat=iostat) i
+    END IF
+    IF (iostat/=0) THEN
+       STOP 7
+    END IF
+  END FUNCTION cp_to_string
+
+  SUBROUTINE cp_unit_create(string)
+    CHARACTER(len=*), INTENT(in)             :: string
+
+    CHARACTER(len=*), PARAMETER :: routineN = 'cp_unit_create', &
+      routineP = moduleN//':'//routineN
+
+    CHARACTER(default_string_length)         :: desc
+    CHARACTER(LEN=40)                        :: formatstr
+    INTEGER                                  :: i_high, i_low, i_unit, &
+                                                len_string, next_power
+    INTEGER, DIMENSION(cp_unit_max_kinds)    :: kind_id, power, unit_id
+    LOGICAL                                  :: failure
+
+    failure=.FALSE.
+    unit_id=cp_units_none
+    kind_id=cp_ukind_none
+    power=0
+    i_low=1
+    i_high=1
+    len_string=LEN(string)
+    i_unit=0
+    next_power=1
+    DO WHILE(i_low<len_string)
+       IF (string(i_low:i_low)/=' ') EXIT
+       i_low=i_low+1
+    END DO
+    i_high=i_low
+    DO WHILE(i_high<=len_string)
+       IF ( string(i_high:i_high)==' '.OR.string(i_high:i_high)=='^'.OR.&
+            string(i_high:i_high)=='*'.OR.string(i_high:i_high)=='/') EXIT
+       i_high=i_high+1
+    END DO
+    DO WHILE(.NOT.failure)
+       IF (i_high<=i_low.OR.i_low>len_string) EXIT
+       i_unit=i_unit+1
+       IF (i_unit>cp_unit_max_kinds) THEN
+          EXIT
+       END IF
+       power(i_unit)=next_power
+       ! parse op
+       i_low=i_high
+       DO WHILE(i_low<=len_string)
+          IF (string(i_low:i_low)/=' ') EXIT
+          i_low=i_low+1
+       END DO
+       i_high=i_low
+       DO WHILE(i_high<=len_string)
+          IF ( string(i_high:i_high)==' '.OR.string(i_high:i_high)=='^'.OR.&
+               string(i_high:i_high)=='*'.OR.string(i_high:i_high)=='/') EXIT
+          i_high=i_high+1
+       END DO
+       IF (i_high<i_low.OR.i_low>len_string) EXIT
+
+       IF (i_high<=len_string) THEN
+          IF (string(i_low:i_high)=='^') THEN
+             i_low=i_high+1
+             DO WHILE(i_low<=len_string)
+                IF (string(i_low:i_low)/=' ') EXIT
+                i_low=i_low+1
+             END DO
+             i_high=i_low
+             DO WHILE(i_high<=len_string)
+                SELECT CASE(string(i_high:i_high))
+                CASE('+','-','0','1','2','3','4','5','6','7','8','9')
+                   i_high=i_high+1
+                CASE default
+                   EXIT
+                END SELECT
+             END DO
+             IF (i_high<=i_low.OR.i_low>len_string) THEN
+                write(6,*) "BUG : XXX"//string//"XXX integer expected"
+                STOP 1
+                EXIT
+             END IF
+          END IF
+       ENDIF
+    END DO
+  END SUBROUTINE cp_unit_create
+
+END MODULE cp_units
+
+USE cp_units
+CALL cp_unit_create("fs^-1")
+END

gcc/tree-vrp.c

@@ -8323,8 +8323,14 @@ vrp_visit_phi_node (gimple phi)
       && edges == old_edges
       && lhs_vr->type != VR_UNDEFINED)
     {
+      /* Compare old and new ranges, fall back to varying if the
+         values are not comparable.  */
       int cmp_min = compare_values (lhs_vr->min, vr_result.min);
+      if (cmp_min == -2)
+	goto varying;
       int cmp_max = compare_values (lhs_vr->max, vr_result.max);
+      if (cmp_max == -2)
+	goto varying;
 
       /* For non VR_RANGE or for pointers fall back to varying if
 	 the range changed.  */