blob: 382dd2b4cdaf6c70477c627865a58946ccab70e7 [file] [log] [blame]
%default {"preinstr":"", "result":"a0", "chkzero":"0"}
/*
* Generic 32-bit "lit8" binary operation. Provide an "instr" line
* that specifies an instruction that performs "result = a0 op a1".
* This could be an MIPS instruction or a function call. (If the result
* comes back in a register other than a0, you can override "result".)
*
* If "chkzero" is set to 1, we perform a divide-by-zero check on
* vCC (a1). Useful for integer division and modulus.
*
* For: add-int/lit8, rsub-int/lit8, mul-int/lit8, div-int/lit8,
* rem-int/lit8, and-int/lit8, or-int/lit8, xor-int/lit8,
* shl-int/lit8, shr-int/lit8, ushr-int/lit8
*/
/* binop/lit8 vAA, vBB, +CC */
FETCH_S(a3, 1) # a3 <- ssssCCBB (sign-extended for CC)
GET_OPA(rOBJ) # rOBJ <- AA
and a2, a3, 255 # a2 <- BB
GET_VREG(a0, a2) # a0 <- vBB
sra a1, a3, 8 # a1 <- ssssssCC (sign extended)
.if $chkzero
# is second operand zero?
beqz a1, common_errDivideByZero
.endif
FETCH_ADVANCE_INST(2) # advance rPC, load rINST
$preinstr # optional op
$instr # $result <- op, a0-a3 changed
GET_INST_OPCODE(t0) # extract opcode from rINST
SET_VREG_GOTO($result, rOBJ, t0) # vAA <- $result