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Object addresses as non-NULL for comparison with NULL.

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acqn 2020-08-20 07:52:22 +08:00 committed by Oliver Schmidt
parent 8e0b2f0833
commit f849de6769
1 changed files with 33 additions and 6 deletions
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39
src/cc65/expr.c
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@ -2428,6 +2428,33 @@ static void hie_compare (const GenDesc* Ops, /* List of generators */
*/
WarnConstCompareResult (Expr);
} else if (ED_CodeRangeIsEmpty (&Expr2) &&
((ED_IsAddrExpr (Expr) && ED_IsNullPtr (&Expr2)) ||
(ED_IsNullPtr (Expr) && (ED_IsAddrExpr (&Expr2))))) {
/* Object addresses are inequal to null pointer */
Expr->IVal = (Tok != TOK_EQ);
if (ED_IsNullPtr (&Expr2)) {
if (Tok == TOK_LT || Tok == TOK_LE) {
Expr->IVal = 0;
}
} else {
if (Tok == TOK_GT || Tok == TOK_GE) {
Expr->IVal = 0;
}
}
/* Get rid of unwanted flags */
ED_MakeConstBool (Expr, Expr->IVal);
/* If the result is constant, this is suspicious when not in
** preprocessor mode.
*/
WarnConstCompareResult (Expr);
/* Both operands are static, remove the generated code */
RemoveCode (&Mark1);
} else {
/* Determine the signedness of the operands */
@ -2485,7 +2512,7 @@ static void hie_compare (const GenDesc* Ops, /* List of generators */
case TOK_EQ:
if (Expr2.IVal < LeftMin || Expr2.IVal > LeftMax) {
ED_MakeConstAbsInt (Expr, 0);
ED_MakeConstBool (Expr, 0);
WarnConstCompareResult (Expr);
goto Done;
}
@ -2493,7 +2520,7 @@ static void hie_compare (const GenDesc* Ops, /* List of generators */
case TOK_NE:
if (Expr2.IVal < LeftMin || Expr2.IVal > LeftMax) {
ED_MakeConstAbsInt (Expr, 1);
ED_MakeConstBool (Expr, 1);
WarnConstCompareResult (Expr);
goto Done;
}
@ -2501,7 +2528,7 @@ static void hie_compare (const GenDesc* Ops, /* List of generators */
case TOK_LT:
if (Expr2.IVal <= LeftMin || Expr2.IVal > LeftMax) {
ED_MakeConstAbsInt (Expr, Expr2.IVal > LeftMax);
ED_MakeConstBool (Expr, Expr2.IVal > LeftMax);
WarnConstCompareResult (Expr);
goto Done;
}
@ -2509,7 +2536,7 @@ static void hie_compare (const GenDesc* Ops, /* List of generators */
case TOK_LE:
if (Expr2.IVal < LeftMin || Expr2.IVal >= LeftMax) {
ED_MakeConstAbsInt (Expr, Expr2.IVal >= LeftMax);
ED_MakeConstBool (Expr, Expr2.IVal >= LeftMax);
WarnConstCompareResult (Expr);
goto Done;
}
@ -2517,7 +2544,7 @@ static void hie_compare (const GenDesc* Ops, /* List of generators */
case TOK_GE:
if (Expr2.IVal <= LeftMin || Expr2.IVal > LeftMax) {
ED_MakeConstAbsInt (Expr, Expr2.IVal <= LeftMin);
ED_MakeConstBool (Expr, Expr2.IVal <= LeftMin);
WarnConstCompareResult (Expr);
goto Done;
}
@ -2525,7 +2552,7 @@ static void hie_compare (const GenDesc* Ops, /* List of generators */
case TOK_GT:
if (Expr2.IVal < LeftMin || Expr2.IVal >= LeftMax) {
ED_MakeConstAbsInt (Expr, Expr2.IVal < LeftMin);
ED_MakeConstBool (Expr, Expr2.IVal < LeftMin);
WarnConstCompareResult (Expr);
goto Done;
}