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authorJakub Jelinek <jakub@redhat.com>2018-07-24 16:23:18 +0200
committerJakub Jelinek <jakub@gcc.gnu.org>2018-07-24 16:23:18 +0200
commitebac3c0236c626f80b005af53505de5b79cba99d (patch)
tree72d98ce93aebf63b039d8879a807402db7e0c088 /gcc/expmed.c
parent337dc307549968ed56e0ef7a60331e8a69e25b56 (diff)
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re PR middle-end/86627 (Signed 128-bit division by 2 no longer expanded to RTL)
PR middle-end/86627 * expmed.c (expand_divmod): Punt if d == HOST_WIDE_INT_MIN and size > HOST_BITS_PER_WIDE_INT. For size > HOST_BITS_PER_WIDE_INT and abs_d == d, do the power of two handling if profitable. * gcc.target/i386/pr86627.c: New test. From-SVN: r262948
Diffstat (limited to 'gcc/expmed.c')
-rw-r--r--gcc/expmed.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c
index f114eb4..101e7b8 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -4480,6 +4480,11 @@ expand_divmod (int rem_flag, enum tree_code code, machine_mode mode,
HOST_WIDE_INT d = INTVAL (op1);
unsigned HOST_WIDE_INT abs_d;
+ /* Not prepared to handle division/remainder by
+ 0xffffffffffffffff8000000000000000 etc. */
+ if (d == HOST_WIDE_INT_MIN && size > HOST_BITS_PER_WIDE_INT)
+ break;
+
/* Since d might be INT_MIN, we have to cast to
unsigned HOST_WIDE_INT before negating to avoid
undefined signed overflow. */
@@ -4522,9 +4527,7 @@ expand_divmod (int rem_flag, enum tree_code code, machine_mode mode,
|| (optab_handler (sdivmod_optab, int_mode)
!= CODE_FOR_nothing)))
;
- else if (EXACT_POWER_OF_2_OR_ZERO_P (abs_d)
- && (size <= HOST_BITS_PER_WIDE_INT
- || abs_d != (unsigned HOST_WIDE_INT) d))
+ else if (EXACT_POWER_OF_2_OR_ZERO_P (abs_d))
{
if (rem_flag)
{