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Small optimizations in range checks

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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.
This commit is contained in:
Roberto Ierusalimschy 2019-03-27 14:56:10 -03:00
parent 0443ad9e28
commit d12262068d
4 changed files with 20 additions and 11 deletions
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3
testes/utf8.lua
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@ -123,6 +123,9 @@ checkerror("continuation byte", utf8.offset, "𦧺", 1, 2)
checkerror("continuation byte", utf8.offset, "𦧺", 1, 2)
checkerror("continuation byte", utf8.offset, "\x80", 1)
-- error in indices for len
checkerror("out of string", utf8.len, "abc", 0, 2)
checkerror("out of string", utf8.len, "abc", 1, 4)
local s = "hello World"