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(fold, case EQ_EXPR): Remove code that converts mod to unsigned mod;

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it isn't correct for negative operands.

From-SVN: r4995
This commit is contained in:
Richard Kenner 1993-07-26 20:26:20 -04:00
parent 437b3c097d
commit e507581872
1 changed files with 5 additions and 0 deletions
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5
gcc/fold-const.c
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@ -4203,6 +4203,10 @@ fold (expr)
arg1)); arg1));
} }
/* It would be nice to do this since it generates better code.
Unfortunately, it doesn't produce the correct result if the
first operand is negative. */
#if 0
/* If this is an NE or EQ comparison of zero against the result of a /* If this is an NE or EQ comparison of zero against the result of a
signed MOD operation, make the MOD operation unsigned since it signed MOD operation, make the MOD operation unsigned since it
is simpler and equivalent. */ is simpler and equivalent. */
@ -4221,6 +4225,7 @@ fold (expr)
return build (code, type, newmod, convert (newtype, arg1)); return build (code, type, newmod, convert (newtype, arg1));
} }
#endif
/* If this is an NE comparison of zero with an AND of one, remove the /* If this is an NE comparison of zero with an AND of one, remove the
comparison since the AND will give the correct value. */ comparison since the AND will give the correct value. */