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Disabling too-aggressive optimization in OptCmp8

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Generates incorrect code for some 16-bit cases. See: #895
This commit is contained in:
bbbradsmith 2019-05-14 22:47:18 -04:00 committed by Oliver Schmidt
parent 448aa35f50
commit 3a3107b244
1 changed files with 10 additions and 5 deletions
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15
src/cc65/coptcmp.c
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@ -885,11 +885,16 @@ unsigned OptCmp8 (CodeSeg* S)
++Changes;
}
/* If we have made changes above, we may also remove the compare */
if (JumpsChanged) {
CS_DelEntry (S, I);
}
/* "If we have made changes above, we may also remove the compare."
**
** Removing the compare was too aggressive. E.g. for 16-bit compares the compiler
** may generate a branch to a second shared branch that still requires the flag
** result of the first compare instruction.
**
**if (JumpsChanged) {
** CS_DelEntry (S, I);
**}
*/
}
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