tree 2a6b0f6c1c2eb962bb383175eb0a67ea81a4564d
parent 1e0c73d5b643707335b06abd2546a83d9439d14c
author Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1553003598 -0300
committer Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1553003598 -0300

New semantics for the integer 'for' loop

The numerical 'for' loop over integers now uses a precomputed counter
to control its number of iteractions. This change eliminates several
weird cases caused by overflows (wrap-around) in the control variable.
(It also ensures that every integer loop halts.)

Also, the special opcodes for the usual case of step==1 were removed.
(The new code is already somewhat complex for the usual case,
but efficient.)