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Implement HIGH() and LOW() operators

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They work with the 16-bit registers BC, DE and HL, returning the
corresponding 8-bit register. HIGH() works with AF as well, returning A.

They also work with any kind of constant or symbol, generating a RPN
patch in the object file if the value is not defined at assembly time.

They work with macro arguments as well.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>
This commit is contained in:
Antonio Niño Díaz
2017-04-06 22:40:34 +01:00
parent bfcef01211
commit a6a47ff66d
5 changed files with 92 additions and 17 deletions
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40
src/asm/rpn.c
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@@ -182,6 +182,46 @@ rpn_LOGAND(struct Expression * expr, struct Expression * src1,
pushbyte(expr, RPN_LOGAND);
}
void
rpn_HIGH(struct Expression * expr, struct Expression * src)
{
*expr = *src;
expr->nVal = (expr->nVal >> 8) & 0xFF;
pushbyte(expr, RPN_CONST);
pushbyte(expr, 8);
pushbyte(expr, 0);
pushbyte(expr, 0);
pushbyte(expr, 0);
pushbyte(expr, RPN_SHR);
pushbyte(expr, RPN_CONST);
pushbyte(expr, 0xFF);
pushbyte(expr, 0);
pushbyte(expr, 0);
pushbyte(expr, 0);
pushbyte(expr, RPN_AND);
}
void
rpn_LOW(struct Expression * expr, struct Expression * src)
{
*expr = *src;
expr->nVal = expr->nVal & 0xFF;
pushbyte(expr, RPN_CONST);
pushbyte(expr, 0xFF);
pushbyte(expr, 0);
pushbyte(expr, 0);
pushbyte(expr, 0);
pushbyte(expr, RPN_AND);
}
void
rpn_LOGEQU(struct Expression * expr, struct Expression * src1,
struct Expression * src2)