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author | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2019-03-19 10:53:18 -0300 |
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committer | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2019-03-19 10:53:18 -0300 |
commit | 9b37a4695ebf50b37b5b4fb279ae948f23b5b6a0 (patch) | |
tree | 2a6b0f6c1c2eb962bb383175eb0a67ea81a4564d /ljumptab.h | |
parent | 1e0c73d5b643707335b06abd2546a83d9439d14c (diff) | |
download | lua-9b37a4695ebf50b37b5b4fb279ae948f23b5b6a0.tar.gz lua-9b37a4695ebf50b37b5b4fb279ae948f23b5b6a0.tar.bz2 lua-9b37a4695ebf50b37b5b4fb279ae948f23b5b6a0.zip |
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.)
Diffstat (limited to 'ljumptab.h')
-rw-r--r-- | ljumptab.h | 2 |
1 files changed, 0 insertions, 2 deletions
@@ -99,8 +99,6 @@ static void *disptab[NUM_OPCODES] = { | |||
99 | &&L_OP_RETURN, | 99 | &&L_OP_RETURN, |
100 | &&L_OP_RETURN0, | 100 | &&L_OP_RETURN0, |
101 | &&L_OP_RETURN1, | 101 | &&L_OP_RETURN1, |
102 | &&L_OP_FORLOOP1, | ||
103 | &&L_OP_FORPREP1, | ||
104 | &&L_OP_FORLOOP, | 102 | &&L_OP_FORLOOP, |
105 | &&L_OP_FORPREP, | 103 | &&L_OP_FORPREP, |
106 | &&L_OP_TFORPREP, | 104 | &&L_OP_TFORPREP, |