tree d3e839cd1ddf3daf5e12c8f472c10a980b7d9d8c
parent 0443ad9e288825b6e4441eb11104bcdb4ff4593a
author Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1553709370 -0300
committer Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1553709370 -0300

Small optimizations in range checks

Checks of the form '1 <= x && x <= M' were rewritten in the form
'(unsigned)x - 1 < (unsigned)M', which is usually more efficient.
(Other similar checks have similar translations.) Although
some compilers do these optimizations, that does not happen
for all compilers or all cases.