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re PR tree-optimization/64807 (Wrong-code because of wide-int division)

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PR tree-optimization/64807
	* wide-int.cc (wi::divmod_internal): Clear
	b_dividend[dividend_blocks_needed].

	* gcc.dg/pr64807.c: New test.

From-SVN: r220153
This commit is contained in:
Jakub Jelinek 2015-01-27 09:26:13 +01:00 committed by Jakub Jelinek
parent dea63e49fa
commit b30ea1387f
4 changed files with 29 additions and 0 deletions

6
gcc/ChangeLog

@ -1,3 +1,9 @@
2015-01-27 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/64807
* wide-int.cc (wi::divmod_internal): Clear
b_dividend[dividend_blocks_needed].
2015-01-26 DJ Delorie <dj@redhat.com>
* config/rl78/rl78.c (move_elim_pass): Don't optimize away

3
gcc/testsuite/ChangeLog

@ -1,5 +1,8 @@
2015-01-27 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/64807
* gcc.dg/pr64807.c: New test.
PR c/64766
* gcc.dg/pr64766.c: New test.

19
gcc/testsuite/gcc.dg/pr64807.c Normal file

@ -0,0 +1,19 @@
/* PR tree-optimization/64807 */
/* { dg-do run { target int128 } } */
/* { dg-options "-O2" } */
__uint128_t
foo (void)
{
__uint128_t a = -1;
__uint128_t b = -1;
return a / b;
}
int
main ()
{
if (foo () != 1)
__builtin_abort ();
return 0;
}

1
gcc/wide-int.cc

@ -1819,6 +1819,7 @@ wi::divmod_internal (HOST_WIDE_INT *quotient, unsigned int *remainder_len,
divisor_blocks_needed, divisor_prec, sgn);
m = dividend_blocks_needed;
b_dividend[m] = 0;
while (m > 1 && b_dividend[m - 1] == 0)
m--;