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const assert = @import("std").debug.assert;
const std = @import("std");
const Type = @import("../../Type.zig");
const Zcu = @import("../../Zcu.zig");
pub const Class = union(enum) {
memory,
byval,
integer,
double_integer,
float_array: u8,
};
/// For `float_array` the second element will be the amount of floats.
pub fn classifyType(ty: Type, zcu: *Zcu) Class {
assert(ty.hasRuntimeBitsIgnoreComptime(zcu));
var maybe_float_bits: ?u16 = null;
switch (ty.zigTypeTag(zcu)) {
.@"struct" => {
if (ty.containerLayout(zcu) == .@"packed") return .byval;
const float_count = countFloats(ty, zcu, &maybe_float_bits);
if (float_count <= sret_float_count) return .{ .float_array = float_count };
const bit_size = ty.bitSize(zcu);
if (bit_size > 128) return .memory;
if (bit_size > 64) return .double_integer;
return .integer;
},
.@"union" => {
if (ty.containerLayout(zcu) == .@"packed") return .byval;
const float_count = countFloats(ty, zcu, &maybe_float_bits);
if (float_count <= sret_float_count) return .{ .float_array = float_count };
const bit_size = ty.bitSize(zcu);
if (bit_size > 128) return .memory;
if (bit_size > 64) return .double_integer;
return .integer;
},
.int, .@"enum", .error_set, .float, .bool => return .byval,
.vector => {
const bit_size = ty.bitSize(zcu);
// TODO is this controlled by a cpu feature?
if (bit_size > 128) return .memory;
return .byval;
},
.optional => {
assert(ty.isPtrLikeOptional(zcu));
return .byval;
},
.pointer => {
assert(!ty.isSlice(zcu));
return .byval;
},
.error_union,
.frame,
.@"anyframe",
.noreturn,
.void,
.type,
.comptime_float,
.comptime_int,
.undefined,
.null,
.@"fn",
.@"opaque",
.enum_literal,
.array,
=> unreachable,
}
}
const sret_float_count = 4;
fn countFloats(ty: Type, zcu: *Zcu, maybe_float_bits: *?u16) u8 {
const ip = &zcu.intern_pool;
const target = zcu.getTarget();
const invalid = std.math.maxInt(u8);
switch (ty.zigTypeTag(zcu)) {
.@"union" => {
const union_obj = zcu.typeToUnion(ty).?;
var max_count: u8 = 0;
for (union_obj.field_types.get(ip)) |field_ty| {
const field_count = countFloats(Type.fromInterned(field_ty), zcu, maybe_float_bits);
if (field_count == invalid) return invalid;
if (field_count > max_count) max_count = field_count;
if (max_count > sret_float_count) return invalid;
}
return max_count;
},
.@"struct" => {
const fields_len = ty.structFieldCount(zcu);
var count: u8 = 0;
var i: u32 = 0;
while (i < fields_len) : (i += 1) {
const field_ty = ty.fieldType(i, zcu);
const field_count = countFloats(field_ty, zcu, maybe_float_bits);
if (field_count == invalid) return invalid;
count += field_count;
if (count > sret_float_count) return invalid;
}
return count;
},
.float => {
const float_bits = maybe_float_bits.* orelse {
maybe_float_bits.* = ty.floatBits(target);
return 1;
};
if (ty.floatBits(target) == float_bits) return 1;
return invalid;
},
.void => return 0,
else => return invalid,
}
}
pub fn getFloatArrayType(ty: Type, zcu: *Zcu) ?Type {
const ip = &zcu.intern_pool;
switch (ty.zigTypeTag(zcu)) {
.@"union" => {
const union_obj = zcu.typeToUnion(ty).?;
for (union_obj.field_types.get(ip)) |field_ty| {
if (getFloatArrayType(Type.fromInterned(field_ty), zcu)) |some| return some;
}
return null;
},
.@"struct" => {
const fields_len = ty.structFieldCount(zcu);
var i: u32 = 0;
while (i < fields_len) : (i += 1) {
const field_ty = ty.fieldType(i, zcu);
if (getFloatArrayType(field_ty, zcu)) |some| return some;
}
return null;
},
.float => return ty,
else => return null,
}
}
|
