* 0 if e1 == e2
* -1 if e1 < e2
* -2 if the relationship could not be determined
- * -3 if e1 /= e2, but we cannot tell which one is larger. */
+ * -3 if e1 /= e2, but we cannot tell which one is larger.
+ REAL and COMPLEX constants are only compared for equality
+ or inequality; if they are unequal, -2 is returned in all cases. */
int
gfc_dep_compare_expr (gfc_expr *e1, gfc_expr *e2)
if (e1->expr_type == EXPR_OP && e1->value.op.op == INTRINSIC_PLUS)
{
- /* Compare X+C vs. X. */
+ /* Compare X+C vs. X, for INTEGER only. */
if (e1->value.op.op2->expr_type == EXPR_CONSTANT
&& e1->value.op.op2->ts.type == BT_INTEGER
&& gfc_dep_compare_expr (e1->value.op.op1, e2) == 0)
}
}
- /* Compare X vs. X+C. */
+ /* Compare X vs. X+C, for INTEGER only. */
if (e2->expr_type == EXPR_OP && e2->value.op.op == INTRINSIC_PLUS)
{
if (e2->value.op.op2->expr_type == EXPR_CONSTANT
return -mpz_sgn (e2->value.op.op2->value.integer);
}
- /* Compare X-C vs. X. */
+ /* Compare X-C vs. X, for INTEGER only. */
if (e1->expr_type == EXPR_OP && e1->value.op.op == INTRINSIC_MINUS)
{
if (e1->value.op.op2->expr_type == EXPR_CONSTANT
}
}
- /* Compare X vs. X-C. */
+ /* Compare X vs. X-C, for INTEGER only. */
if (e2->expr_type == EXPR_OP && e2->value.op.op == INTRINSIC_MINUS)
{
if (e2->value.op.op2->expr_type == EXPR_CONSTANT
if (e1->ts.type == BT_CHARACTER && e2->ts.type == BT_CHARACTER)
return gfc_compare_string (e1, e2);
+ /* Compare REAL and COMPLEX constants. Because of the
+ traps and pitfalls associated with comparing
+ a + 1.0 with a + 0.5, check for equality only. */
+ if (e2->expr_type == EXPR_CONSTANT)
+ {
+ if (e1->ts.type == BT_REAL && e2->ts.type == BT_REAL)
+ {
+ if (mpfr_cmp (e1->value.real, e2->value.real) == 0)
+ return 0;
+ else
+ return -2;
+ }
+ else if (e1->ts.type == BT_COMPLEX && e2->ts.type == BT_COMPLEX)
+ {
+ if (mpc_cmp (e1->value.complex, e2->value.complex) == 0)
+ return 0;
+ else
+ return -2;
+ }
+ }
+
if (e1->ts.type != BT_INTEGER || e2->ts.type != BT_INTEGER)
return -2;
+ /* For INTEGER, all cases where e2 is not constant should have
+ been filtered out above. */
+ gcc_assert (e2->expr_type == EXPR_CONSTANT);
+
i = mpz_cmp (e1->value.integer, e2->value.integer);
if (i == 0)
return 0;
else if (e1->value.op.op == INTRINSIC_TIMES
&& gfc_dep_compare_expr (e1->value.op.op1, e2->value.op.op2) == 0
&& gfc_dep_compare_expr (e1->value.op.op2, e2->value.op.op1) == 0)
- /* Commutativity of multiplication. */
+ /* Commutativity of multiplication; addition is handled above. */
return 0;
return -2;
--- /dev/null
+! { dg-do compile }
+! { dg-options "-O -fdump-tree-original" }
+program main
+ integer, parameter :: n=100
+ real, parameter :: pi=4*atan(1.)
+ real, parameter :: tmax=20.
+ real, parameter :: dt = tmax/(2*pi)/real(n)
+ real, parameter :: t0 = dt/30.
+ integer :: i
+ interface
+ pure function purefunc(x)
+ real :: purefunc
+ real, intent(in) :: x
+ end function purefunc
+ end interface
+ real :: a(n)
+ do i=1,n
+ a(i) = purefunc(dt*i + t0) * 3. + 2 * purefunc(t0 + i*dt)
+ end do
+ print *,a
+end program main
+! { dg-final { scan-tree-dump-times "purefunc" 1 "original" } }
+! { dg-final { cleanup-tree-dump "original" } }