https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99202
Bug ID: 99202 Summary: Undefined behaviour in libquadmath file rem_pio2q.c function __quadmath_rem_pio2q Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libquadmath Assignee: unassigned at gcc dot gnu.org Reporter: zeccav at gmail dot com Target Milestone: --- ! from dec_math.f90 ! must be compiled and run ! gfortran compiler needs not be sanitized ! must load sanitized libquadmath.so.0 as in ldd a.out -> libquadmath.so.0 => /home/vitti/local/gcc-150221-undefined/lib64/libquadmath.so.0 ! ../../../gcc-150221/libquadmath/math/rem_pio2q.c:562:26: runtime error: left shift of 4612846647631955497 by 23 places cannot be represented in type 'long int' ! rem_pio2q.c:562 -> "tx [2] = (double)(((ix << 23) | (lx >> 41)) & 0xffffff);" real(16) :: q_i1, q_oa q_i1 = 34.3774677078493908766176900826395_16 q_oa = cotan (q_i1) end