compiler: change canonical path for backend ABI source files

1 files changed, 84 insertions, 0 deletions

diff --git a/src/codegen/mips/abi.zig b/src/codegen/mips/abi.zig
new file mode 100644
index 0000000000..02c4c637a4
--- /dev/null
+++ b/src/codegen/mips/abi.zig
@@ -0,0 +1,84 @@
+const std = @import("std");
+const Type = @import("../../Type.zig");
+const Zcu = @import("../../Zcu.zig");
+const assert = std.debug.assert;
+
+pub const Class = union(enum) {
+    memory,
+    byval,
+    i32_array: u8,
+};
+
+pub const Context = enum { ret, arg };
+
+pub fn classifyType(ty: Type, zcu: *Zcu, ctx: Context) Class {
+    const target = zcu.getTarget();
+    std.debug.assert(ty.hasRuntimeBitsIgnoreComptime(zcu));
+
+    const max_direct_size = target.ptrBitWidth() * 2;
+    switch (ty.zigTypeTag(zcu)) {
+        .@"struct" => {
+            const bit_size = ty.bitSize(zcu);
+            if (ty.containerLayout(zcu) == .@"packed") {
+                if (bit_size > max_direct_size) return .memory;
+                return .byval;
+            }
+            if (bit_size > max_direct_size) return .memory;
+            // TODO: for bit_size <= 32 using byval is more correct, but that needs inreg argument attribute
+            const count = @as(u8, @intCast(std.mem.alignForward(u64, bit_size, 32) / 32));
+            return .{ .i32_array = count };
+        },
+        .@"union" => {
+            const bit_size = ty.bitSize(zcu);
+            if (ty.containerLayout(zcu) == .@"packed") {
+                if (bit_size > max_direct_size) return .memory;
+                return .byval;
+            }
+            if (bit_size > max_direct_size) return .memory;
+
+            return .byval;
+        },
+        .bool => return .byval,
+        .float => return .byval,
+        .int, .@"enum", .error_set => {
+            return .byval;
+        },
+        .vector => {
+            const elem_type = ty.elemType2(zcu);
+            switch (elem_type.zigTypeTag(zcu)) {
+                .bool, .int => {
+                    const bit_size = ty.bitSize(zcu);
+                    if (ctx == .ret and bit_size > 128) return .memory;
+                    if (bit_size > 512) return .memory;
+                    // TODO: byval vector arguments with non power of 2 size need inreg attribute
+                    return .byval;
+                },
+                .float => return .memory,
+                else => unreachable,
+            }
+        },
+        .optional => {
+            std.debug.assert(ty.isPtrLikeOptional(zcu));
+            return .byval;
+        },
+        .pointer => {
+            std.debug.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,
+    }
+}