diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2016-01-27 12:40:04 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2016-01-27 12:40:04 +0100 |
| commit | b1652ddea99943a7a6df4be25e3a35e4eeeeb86d (patch) | |
| tree | bce699e60643f9feadb835a3de8da891519c2eca | |
| parent | dfa654c8cf28dc2f85ccb45b85de3ee26edcc580 (diff) | |
| download | gcc-b1652ddea99943a7a6df4be25e3a35e4eeeeb86d.zip gcc-b1652ddea99943a7a6df4be25e3a35e4eeeeb86d.tar.gz gcc-b1652ddea99943a7a6df4be25e3a35e4eeeeb86d.tar.bz2 | |
re PR tree-optimization/69399 (wrong code with -O and int128)
PR tree-optimization/69399
* wide-int.h (wi::lrshift): For larger precisions, only
use fast path if shift is known to be < HOST_BITS_PER_WIDE_INT.
* gcc.dg/torture/pr69399.c: New test.
From-SVN: r232869
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/torture/pr69399.c | 18 | ||||
| -rw-r--r-- | gcc/wide-int.h | 4 |
4 files changed, 32 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a66eee5..12a2583 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2016-01-27 Jakub Jelinek <jakub@redhat.com> + + PR tree-optimization/69399 + * wide-int.h (wi::lrshift): For larger precisions, only + use fast path if shift is known to be < HOST_BITS_PER_WIDE_INT. + 2016-01-27 Claudiu Zissulescu <claziss@synopsys.com> * config/arc/predicates.md (proper_comparison_operator): Reject diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index b7e6dac..aa3d51b 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2016-01-27 Jakub Jelinek <jakub@redhat.com> + + PR tree-optimization/69399 + * gcc.dg/torture/pr69399.c: New test. + 2016-01-27 Eric Botcazou <ebotcazou@adacore.com> * gcc.dg/tree-ssa/ssa-dom-cse-2.c: XFAIL on SPARC 64-bit. diff --git a/gcc/testsuite/gcc.dg/torture/pr69399.c b/gcc/testsuite/gcc.dg/torture/pr69399.c new file mode 100644 index 0000000..24fa48c --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr69399.c @@ -0,0 +1,18 @@ +/* { dg-do run { target int128 } } */ + +static unsigned __attribute__((noinline, noclone)) +foo (unsigned long long u) +{ + unsigned __int128 v = u | 0xffffff81U; + v >>= 64; + return v; +} + +int +main () +{ + unsigned x = foo (27); + if (x != 0) + __builtin_abort (); + return 0; +} diff --git a/gcc/wide-int.h b/gcc/wide-int.h index 56cf582..fa133f0 100644 --- a/gcc/wide-int.h +++ b/gcc/wide-int.h @@ -2909,7 +2909,9 @@ wi::lrshift (const T1 &x, const T2 &y) For variable-precision integers like wide_int, handle HWI and sub-HWI integers inline. */ if (STATIC_CONSTANT_P (xi.precision > HOST_BITS_PER_WIDE_INT) - ? xi.len == 1 && xi.val[0] >= 0 + ? (shift < HOST_BITS_PER_WIDE_INT + && xi.len == 1 + && xi.val[0] >= 0) : xi.precision <= HOST_BITS_PER_WIDE_INT) { val[0] = xi.to_uhwi () >> shift; |