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| author | Jakub Jelinek <jakub@redhat.com> | 2015-01-27 09:26:13 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2015-01-27 09:26:13 +0100 |
| commit | b30ea1387f8e26ad60bd4d71ba2006ea7e11a6ee (patch) | |
| tree | efd1cdf9e7ff72e23d172b15b2d7aa785d5a4b43 | |
| parent | dea63e49fa986d91885d192fae0a5c19fea77aa1 (diff) | |
| download | gcc-b30ea1387f8e26ad60bd4d71ba2006ea7e11a6ee.zip gcc-b30ea1387f8e26ad60bd4d71ba2006ea7e11a6ee.tar.gz gcc-b30ea1387f8e26ad60bd4d71ba2006ea7e11a6ee.tar.bz2 | |
re PR tree-optimization/64807 (Wrong-code because of wide-int division)
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
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 3 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/pr64807.c | 19 | ||||
| -rw-r--r-- | gcc/wide-int.cc | 1 |
4 files changed, 29 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 5add607..05b5f74 100644 --- a/gcc/ChangeLog +++ b/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 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 57a58b4..f148ca1 100644 --- a/gcc/testsuite/ChangeLog +++ b/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. diff --git a/gcc/testsuite/gcc.dg/pr64807.c b/gcc/testsuite/gcc.dg/pr64807.c new file mode 100644 index 0000000..e1bd604 --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr64807.c @@ -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; +} diff --git a/gcc/wide-int.cc b/gcc/wide-int.cc index 1143b48..fd7cbb4 100644 --- a/gcc/wide-int.cc +++ b/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--; |