[Bug tree-optimization/66828] [5/6 Regression] gcc/tree-ssa-math-opts.c:2182:38: runtime error: left shift of 72057594037927936 by 8 places cannot be represented in type 'long int'
thopre01 at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Mon Jul 13 06:16:00 GMT 2015
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66828
Thomas Preud'homme <thopre01 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2015-07-13
Ever confirmed|0 |1
--- Comment #1 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
I'm having trouble to reproduce the bug. I do encounter some ubsan errors but
in other files (most notably in hwint.h). This might hide the errors in
tree-ssa-math-opts.c
Anyway, according to the line number the issue seems to come from the following
line:
for (i = 0; i < size; i++, inc <<= BITS_PER_MARKER)
size is guaranteed to be less or equal to 64 / BITS_PER_MARKER as per checks in
find_bswap_or_nop_1 (CASE_CONVERT) and in init_symbolic_number. However, this
means after the last execution of the body, inc is shift by more than 63 bits
in total.
I'm now testing a patch via bootstrap + regression testsuite.
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