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For bit fields contained within single bytes, try to do character operations

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instead of word sized ops.


git-svn-id: svn://svn.cc65.org/cc65/trunk@4089 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2009-08-30 09:01:04 +00:00
parent 0b0353de13
commit 45d4771584
1 changed files with 18 additions and 3 deletions
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21
src/cc65/assignment.c
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@ -161,12 +161,22 @@ void Assignment (ExprDesc* Expr)
} else if (ED_IsBitField (Expr)) { } else if (ED_IsBitField (Expr)) {
unsigned Mask; unsigned Mask;
unsigned Flags = TypeOf (Expr->Type); unsigned Flags;
/* If the bit-field fits within one byte, do the following operations
* with bytes.
*/
if (Expr->BitOffs / CHAR_BITS == (Expr->BitOffs + Expr->BitWidth - 1) / CHAR_BITS) {
Expr->Type = type_uchar;
}
/* Determine code generator flags */
Flags = TypeOf (Expr->Type);
/* Assignment to a bit field. Get the address on stack for the store. */ /* Assignment to a bit field. Get the address on stack for the store. */
PushAddr (Expr); PushAddr (Expr);
/* Load the value from the location as an unsigned */ /* Load the value from the location */
Expr->Flags &= ~E_BITFIELD; Expr->Flags &= ~E_BITFIELD;
LoadExpr (CF_NONE, Expr); LoadExpr (CF_NONE, Expr);
@ -180,7 +190,9 @@ void Assignment (ExprDesc* Expr)
/* Read the expression on the right side of the '=' */ /* Read the expression on the right side of the '=' */
hie1 (&Expr2); hie1 (&Expr2);
/* Do type conversion if necessary */ /* Do type conversion if necessary. Beware: Do not use char type
* here!
*/
TypeConversion (&Expr2, ltype); TypeConversion (&Expr2, ltype);
/* If necessary, load the value into the primary register */ /* If necessary, load the value into the primary register */
@ -198,6 +210,9 @@ void Assignment (ExprDesc* Expr)
/* Generate a store instruction */ /* Generate a store instruction */
Store (Expr, 0); Store (Expr, 0);
/* Restore the expression type */
Expr->Type = ltype;
} else { } else {
/* Get the address on stack if needed */ /* Get the address on stack if needed */