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Add fast path for char postdec

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This commit is contained in:
Lauri Kasanen 2017-05-06 13:23:50 +03:00
parent 767f093ff8
commit ead0338c0d
1 changed files with 24 additions and 15 deletions
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39
src/cc65/expr.c
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@ -1590,26 +1590,35 @@ static void PostDec (ExprDesc* Expr)
/* Get the data type */
Flags = TypeOf (Expr->Type);
/* Push the address if needed */
PushAddr (Expr);
/* Fast path: char */
if ((Flags & CF_CHAR) == CF_CHAR && ED_GetLoc(Expr) & (E_LOC_GLOBAL | E_LOC_STATIC)) {
/* Fetch the value and save it (since it's the result of the expression) */
LoadExpr (CF_NONE, Expr);
g_save (Flags | CF_FORCECHAR);
LoadExpr (CF_NONE, Expr);
AddCodeLine ("dec %s", ED_GetLabelName(Expr, 0));
/* If we have a pointer expression, increment by the size of the type */
if (IsTypePtr (Expr->Type)) {
g_dec (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
} else {
g_dec (Flags | CF_CONST | CF_FORCECHAR, 1);
/* Push the address if needed */
PushAddr (Expr);
/* Fetch the value and save it (since it's the result of the expression) */
LoadExpr (CF_NONE, Expr);
g_save (Flags | CF_FORCECHAR);
/* If we have a pointer expression, increment by the size of the type */
if (IsTypePtr (Expr->Type)) {
g_dec (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
} else {
g_dec (Flags | CF_CONST | CF_FORCECHAR, 1);
}
/* Store the result back */
Store (Expr, 0);
/* Restore the original value in the primary register */
g_restore (Flags | CF_FORCECHAR);
}
/* Store the result back */
Store (Expr, 0);
/* Restore the original value in the primary register */
g_restore (Flags | CF_FORCECHAR);
/* The result is always an expression, no reference */
ED_MakeRValExpr (Expr);
}