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re PR target/70450 (Wrong code with -O0 and -O1.)

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2016-03-30  Richard Biener  <rguenther@suse.de>

	PR middle-end/70450
	* fold-const.c (extract_muldiv_1): Fix thinko in wide_int::from
	usage.

	* gcc.dg/torture/pr70450.c: New testcase.

From-SVN: r234571
This commit is contained in:
Richard Biener 2016-03-30 14:18:28 +00:00 committed by Richard Biener
parent d43242b9b9
commit f6d2d066c2
4 changed files with 34 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-03-30 Richard Biener <rguenther@suse.de>
PR middle-end/70450
* fold-const.c (extract_muldiv_1): Fix thinko in wide_int::from
usage.
2016-03-30 Jakub Jelinek <jakub@redhat.com>
PR target/70421

6
gcc/fold-const.c
View File

@ -6375,8 +6375,10 @@ extract_muldiv_1 (tree t, tree c, enum tree_code code, tree wide_type,
bool overflow_mul_p;
signop sign = TYPE_SIGN (ctype);
unsigned prec = TYPE_PRECISION (ctype);
wide_int mul = wi::mul (wide_int::from (op1, prec, sign),
wide_int::from (c, prec, sign),
wide_int mul = wi::mul (wide_int::from (op1, prec,
TYPE_SIGN (TREE_TYPE (op1))),
wide_int::from (c, prec,
TYPE_SIGN (TREE_TYPE (c))),
sign, &overflow_mul_p);
overflow_p = TREE_OVERFLOW (c) | TREE_OVERFLOW (op1);
if (overflow_mul_p

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-03-30 Richard Biener <rguenther@suse.de>
PR middle-end/70450
* gcc.dg/torture/pr70450.c: New testcase.
2016-03-30 Jakub Jelinek <jakub@redhat.com>
PR target/70421

19
gcc/testsuite/gcc.dg/torture/pr70450.c Normal file
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@ -0,0 +1,19 @@
/* { dg-do run } */
/* { dg-require-effective-target lp64 } */
unsigned long int a = 2UL;
int b = 2;
unsigned long int c = 2UL;
void foo ()
{
c = 2 * ((2 * a) * (2 * (-b)));
}
int main ()
{
foo();
if (c != 18446744073709551584UL)
__builtin_abort();
return 0;
}