On Wed, 30 Oct 2013 15:48:58 -0400, Gord Tomlin wrote: >On 2013-10-30 12:18, John Gilmore wrote: >> What are deleted are blocks of 'unreachable' code. > >Some compilers issue a warning or error message if they encounter >unreachable statements. For example, see messages CCN3472, CCN3520, >CCN6274 and CCN7640 in "z/OS V1R13.0 XL C/C++ Messages". > In FORTRAN II it was simply fatal. I understand it was because the optimization pass couldn't deal with the situation. (Perhaps it divided by zero when it tried to weight the paths.) PITA when, for testing, one wanted to branch unconditionally around a statement.
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