https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118862
Bug ID: 118862
Summary: UBSAN: shift exponent too large since
r15-7345-gc2a0ee58865c5a
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: jamborm at gcc dot gnu.org
CC: tkoenig at gcc dot gnu.org
Blocks: 63426
Target Milestone: ---
Host: x86_64-linux
Target: x86_64-linux
With UBSAN instrumented compiler (revision ), compiling the
testcase gfortran.dg/unsigned_44.f90 at -O3 fails with:
/home/worker/buildworker/tiber-gcc-ubsan/build/gcc/fortran/trans-expr.cc:3650:44:
runtime error: shift exponent 127 is too large for 64-bit type 'long unsigned
int'
To configure the compiler with UBSAN, bootstrap it with option
--with-build-config=bootstrap-ubsan (we also only do release
checking).
I have bisected the failure to r15-7345-gc2a0ee58865c5a (Thomas
Koenig: Add modular exponentiation for UNSIGNED.)
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63426
[Bug 63426] [meta-bug] Issues found with -fsanitize=undefined
