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fold-const.c (tree_expr_nonnegative_p): Handle *_DIV_EXPR, *_MOD_EXPR, SAVE_EXPR and NON_LVALUE_EXPR.

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* fold-const.c (tree_expr_nonnegative_p): Handle *_DIV_EXPR,
	*_MOD_EXPR, SAVE_EXPR and NON_LVALUE_EXPR.

testsuite:
	* gcc.dg/compare5.c: New testcase.

From-SVN: r45148
This commit is contained in:
Kaveh R. Ghazi 2001-08-24 12:18:45 +00:00 committed by Kaveh Ghazi
parent 271e349bc3
commit ada1133554
4 changed files with 65 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-08-24 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* fold-const.c (tree_expr_nonnegative_p): Handle *_DIV_EXPR,
*_MOD_EXPR, SAVE_EXPR and NON_LVALUE_EXPR.
2001-08-23 Jason Merrill <jason_merrill@redhat.com>
* c-pragma.h: Move weak_syms and weak_decls...

15
gcc/fold-const.c
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@ -7397,6 +7397,17 @@ tree_expr_nonnegative_p (t)
return 1;
case INTEGER_CST:
return tree_int_cst_sgn (t) >= 0;
case TRUNC_DIV_EXPR:
case CEIL_DIV_EXPR:
case FLOOR_DIV_EXPR:
case ROUND_DIV_EXPR:
return tree_expr_nonnegative_p (TREE_OPERAND (t, 0))
&& tree_expr_nonnegative_p (TREE_OPERAND (t, 1));
case TRUNC_MOD_EXPR:
case CEIL_MOD_EXPR:
case FLOOR_MOD_EXPR:
case ROUND_MOD_EXPR:
return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
case COND_EXPR:
return tree_expr_nonnegative_p (TREE_OPERAND (t, 1))
&& tree_expr_nonnegative_p (TREE_OPERAND (t, 2));
@ -7412,6 +7423,10 @@ tree_expr_nonnegative_p (t)
return tree_expr_nonnegative_p (TREE_OPERAND (t, 1));
case BIND_EXPR:
return tree_expr_nonnegative_p (TREE_OPERAND (t, 1));
case SAVE_EXPR:
return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
case NON_LVALUE_EXPR:
return tree_expr_nonnegative_p (TREE_OPERAND (t, 0));
case RTL_EXPR:
return rtl_expr_nonnegative_p (RTL_EXPR_RTL (t));

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2001-08-24 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* gcc.dg/compare5.c: New testcase.
2001-08-23 Jason Merrill <jason_merrill@redhat.com>
* lib/prune.exp (prune_gcc_output): Also ignore "In constructor"

41
gcc/testsuite/gcc.dg/compare5.c Normal file
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@ -0,0 +1,41 @@
/* Test for a bogus warning on comparison between signed and unsigned.
Origin: Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 8/21/2001. */
/* { dg-do compile } */
/* { dg-options "-Wsign-compare" } */
extern void bar(void);
int foo(int x, int y, unsigned u)
{
/* A *_DIV_EXPR is non-negative if both operands are. */
if (u < ((x=-22)/33)) /* { dg-warning "signed and unsigned" "DIV_EXPR" } */
return x;
if (u < ((x=22)/33))
return x;
if (u < ((x=22)/(y=33)))
return x;
if (u < (((x&0x10000)?128:64) / ((y&0x10000)?8:4)))
return x;
/* A *_MOD_EXPR is non-negative if the first operand is. */
if (u < ((x=-22)%33)) /* { dg-warning "signed and unsigned" "MOD_EXPR" } */
return x;
if (u < ((x=22)%-33))
return x;
if (u < ((x==y)%-33))
return x;
if (u < (((x=22)/33)%-33))
return x;
return 0;
}