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fold-const.c (extract_muldiv_1): If ctype is unsigned and type signed...

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* fold-const.c (extract_muldiv_1) <case ABS_EXPR>: If ctype is
	unsigned and type signed, build ABS_EXPR with signed_type (ctype)
	and only afterwards convert to ctype.

	* gcc.c-torture/execute/20041126-1.c: New test.

From-SVN: r91373
This commit is contained in:
Jakub Jelinek 2004-11-27 11:13:56 +01:00 • committed by Jakub Jelinek
parent 87980da05e
commit 47d42ce271
4 changed files with 51 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-11-27 Jakub Jelinek <jakub@redhat.com>
* fold-const.c (extract_muldiv_1) <case ABS_EXPR>: If ctype is
unsigned and type signed, build ABS_EXPR with signed_type (ctype)
and only afterwards convert to ctype.
2004-11-27 Richard Sandiford <rsandifo@redhat.com> 2004-11-27 Richard Sandiford <rsandifo@redhat.com>
* config/mips/mips-protos.h (function_arg_boundary): Declare. * config/mips/mips-protos.h (function_arg_boundary): Declare.

16
gcc/fold-const.c
View file

@ -5127,7 +5127,21 @@ extract_muldiv_1 (tree t, tree c, enum tree_code code, tree wide_type)
return t1; return t1;
break; break;
case NEGATE_EXPR: case ABS_EXPR: case ABS_EXPR:
/* If widening the type changes it from signed to unsigned, then we
must avoid building ABS_EXPR itself as unsigned. */
if (TYPE_UNSIGNED (ctype) && !TYPE_UNSIGNED (type))
{
tree cstype = (*lang_hooks.types.signed_type) (ctype);
if ((t1 = extract_muldiv (op0, c, code, cstype)) != 0)
{
t1 = fold (build1 (tcode, cstype, fold_convert (cstype, t1)));
return fold_convert (ctype, t1);
}
break;
}
/* FALLTHROUGH */
case NEGATE_EXPR:
if ((t1 = extract_muldiv (op0, c, code, wide_type)) != 0) if ((t1 = extract_muldiv (op0, c, code, wide_type)) != 0)
return fold (build1 (tcode, ctype, fold_convert (ctype, t1))); return fold (build1 (tcode, ctype, fold_convert (ctype, t1)));
break; break;

4
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,7 @@
2004-11-27 Jakub Jelinek <jakub@redhat.com>
* gcc.c-torture/execute/20041126-1.c: New test.
2004-11-27 Richard Sandiford <rsandifo@redhat.com> 2004-11-27 Richard Sandiford <rsandifo@redhat.com>
* gcc.dg/mips-args-1.c: Don't expect _R3000 or _R4000 to be defined * gcc.dg/mips-args-1.c: Don't expect _R3000 or _R4000 to be defined

26
gcc/testsuite/gcc.c-torture/execute/20041126-1.c Normal file
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@ -0,0 +1,26 @@
extern int abs (int);
extern void abort (void);
void
check (int *p)
{
int i;
for (i = 0; i < 5; ++i)
if (p[i])
abort ();
for (; i < 10; ++i)
if (p[i] != i + 1)
abort ();
}
int
main (void)
{
int a[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int i;
for (i = -5; i < 0; i++)
a[abs (i - 10) - 11] = 0;
check (a);
return 0;
}