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Fix for issue #735

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laubzega 2018-10-14 13:53:14 -07:00 • committed by Oliver Schmidt
parent 03e43d1fbf
commit 8eb9f4a8aa
1 changed files with 7 additions and 1 deletions
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8
src/cc65/coptind.c
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@ -2056,8 +2056,14 @@ unsigned OptPrecalc (CodeSeg* S)
** results we don't already have (including the flags), so ** results we don't already have (including the flags), so
** remove it. Something like this is generated as a result of ** remove it. Something like this is generated as a result of
** a compare where parts of the values are known to be zero. ** a compare where parts of the values are known to be zero.
** The only situation where we need to leave things as they are
** is when V flag is being tested in the next instruction,
** because ADC/SBC #0 always clears it.
*/ */
if (In->RegA == 0 && CE_IsKnownImm (E, 0x00)) { if (In->RegA == 0 && CE_IsKnownImm (E, 0x00) &&
(E = CS_GetEntry (S, I + 1)) &&
E->OPC != OP65_BVC &&
E->OPC != OP65_BVS ) {
/* 0-0 or 0+0 -> remove */ /* 0-0 or 0+0 -> remove */
CS_DelEntry (S, I); CS_DelEntry (S, I);
++Changes; ++Changes;