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use super::*;
pub(super) fn apply_top_op() -> Vec<Node> {
let mut nodes = Vec::new();
nodes.push(Node::let_bind("apply_op", Expr::u32(0)));
nodes.extend(pop_stack("op_stack", "osp", "apply_op"));
// Always pop one value (the unary operand or the binary RHS).
nodes.push(Node::let_bind("apply_rhs", Expr::u32(0)));
nodes.extend(pop_stack("val_stack", "vsp", "apply_rhs"));
// Pop a second value only for binary opcodes. Unary opcodes
// are >= 100; for those `apply_lhs` stays 0 and is unused
// because the unary result is computed solely from
// `apply_rhs` (the operand) below.
nodes.push(Node::let_bind("apply_lhs", Expr::u32(0)));
nodes.push(Node::if_then(
Expr::lt(Expr::var("apply_op"), Expr::u32(100)),
pop_stack("val_stack", "vsp", "apply_lhs"),
));
// Unary computation overrides apply_result for unary ops.
nodes.push(Node::let_bind(
"unary_result",
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_UN_NOT)),
Expr::select(
Expr::eq(Expr::var("apply_rhs"), Expr::u32(0)),
Expr::u32(1),
Expr::u32(0),
),
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_UN_BNOT)),
Expr::sub(Expr::u32(0xFFFF_FFFF), Expr::var("apply_rhs")),
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_UN_NEG)),
Expr::sub(Expr::u32(0), Expr::var("apply_rhs")),
Expr::var("apply_rhs"),
),
),
),
));
// Compute result based on apply_op. Division/modulo use guarded IR
// arithmetic so kernels never issue undefined divide instructions.
nodes.push(Node::if_then(
Expr::and(
Expr::or(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_DIV)),
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_MOD)),
),
Expr::eq(Expr::var("apply_rhs"), Expr::u32(0)),
),
vec![Node::assign("expr_invalid", Expr::u32(1))],
));
nodes.push(Node::let_bind(
"apply_result",
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_ADD)),
Expr::add(Expr::var("apply_lhs"), Expr::var("apply_rhs")),
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_SUB)),
Expr::sub(Expr::var("apply_lhs"), Expr::var("apply_rhs")),
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_MUL)),
Expr::mul(Expr::var("apply_lhs"), Expr::var("apply_rhs")),
Expr::select(
Expr::and(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_DIV)),
Expr::ne(Expr::var("apply_rhs"), Expr::u32(0)),
),
Expr::div(Expr::var("apply_lhs"), Expr::var("apply_rhs")),
Expr::select(
Expr::and(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_MOD)),
Expr::ne(Expr::var("apply_rhs"), Expr::u32(0)),
),
Expr::rem(Expr::var("apply_lhs"), Expr::var("apply_rhs")),
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_BAND)),
Expr::bitand(Expr::var("apply_lhs"), Expr::var("apply_rhs")),
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_BOR)),
Expr::bitor(Expr::var("apply_lhs"), Expr::var("apply_rhs")),
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_BXOR)),
Expr::bitxor(
Expr::var("apply_lhs"),
Expr::var("apply_rhs"),
),
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_LAND)),
Expr::select(
Expr::and(
Expr::ne(
Expr::var("apply_lhs"),
Expr::u32(0),
),
Expr::ne(
Expr::var("apply_rhs"),
Expr::u32(0),
),
),
Expr::u32(1),
Expr::u32(0),
),
Expr::select(
Expr::eq(Expr::var("apply_op"), Expr::u32(OP_LOR)),
Expr::select(
Expr::or(
Expr::ne(
Expr::var("apply_lhs"),
Expr::u32(0),
),
Expr::ne(
Expr::var("apply_rhs"),
Expr::u32(0),
),
),
Expr::u32(1),
Expr::u32(0),
),
Expr::select(
Expr::eq(
Expr::var("apply_op"),
Expr::u32(OP_EQ),
),
Expr::select(
Expr::eq(
Expr::var("apply_lhs"),
Expr::var("apply_rhs"),
),
Expr::u32(1),
Expr::u32(0),
),
Expr::select(
Expr::eq(
Expr::var("apply_op"),
Expr::u32(OP_NE),
),
Expr::select(
Expr::ne(
Expr::var("apply_lhs"),
Expr::var("apply_rhs"),
),
Expr::u32(1),
Expr::u32(0),
),
Expr::select(
Expr::eq(
Expr::var("apply_op"),
Expr::u32(OP_LT),
),
Expr::select(
Expr::lt(
Expr::var("apply_lhs"),
Expr::var("apply_rhs"),
),
Expr::u32(1),
Expr::u32(0),
),
Expr::select(
Expr::eq(
Expr::var("apply_op"),
Expr::u32(OP_LE),
),
Expr::select(
Expr::le(
Expr::var("apply_lhs"),
Expr::var("apply_rhs"),
),
Expr::u32(1),
Expr::u32(0),
),
Expr::select(
Expr::eq(
Expr::var("apply_op"),
Expr::u32(OP_GT),
),
Expr::select(
Expr::gt(
Expr::var("apply_lhs"),
Expr::var("apply_rhs"),
),
Expr::u32(1),
Expr::u32(0),
),
Expr::select(
Expr::eq(
Expr::var("apply_op"),
Expr::u32(OP_GE),
),
Expr::select(
Expr::ge(
Expr::var("apply_lhs"),
Expr::var("apply_rhs"),
),
Expr::u32(1),
Expr::u32(0),
),
Expr::select(
Expr::eq(
Expr::var(
"apply_op",
),
Expr::u32(OP_SHL),
),
Expr::shl(
Expr::var(
"apply_lhs",
),
Expr::bitand(
Expr::var(
"apply_rhs",
),
Expr::u32(31),
),
),
Expr::select(
Expr::eq(
Expr::var(
"apply_op",
),
Expr::u32(OP_SHR),
),
Expr::shr(
Expr::var(
"apply_lhs",
),
Expr::bitand(
Expr::var(
"apply_rhs",
),
Expr::u32(
31,
),
),
),
Expr::u32(0),
),
),
),
),
),
),
),
),
),
),
),
),
),
),
),
),
),
),
));
// Final result: unary opcodes use the unary path; binary use
// the apply_result cascade above.
nodes.push(Node::let_bind(
"final_result",
Expr::select(
Expr::ge(Expr::var("apply_op"), Expr::u32(100)),
Expr::var("unary_result"),
Expr::var("apply_result"),
),
));
nodes.extend(push_stack("val_stack", "vsp", Expr::var("final_result")));
nodes
}