Merge pull request #5307 from ziglang/self-hosted-incremental-compilation

rework self-hosted compiler for incremental builds

1 files changed, 30 insertions, 0 deletions

diff --git a/src-self-hosted/codegen/x86.zig b/src-self-hosted/codegen/x86.zig
new file mode 100644
index 0000000000..60872dedb9
--- /dev/null
+++ b/src-self-hosted/codegen/x86.zig
@@ -0,0 +1,30 @@
+// zig fmt: off
+pub const Register = enum(u8) {
+    // 0 through 7, 32-bit registers. id is int value
+    eax, ecx, edx, ebx, esp, ebp, esi, edi, 
+
+    // 8-15, 16-bit registers. id is int value - 8.
+    ax, cx, dx, bx, sp, bp, si, di,
+    
+    // 16-23, 8-bit registers. id is int value - 16.
+    al, bl, cl, dl, ah, ch, dh, bh,
+
+    /// Returns the bit-width of the register.
+    pub fn size(self: @This()) u7 {
+        return switch (@enumToInt(self)) {
+            0...7 => 32,
+            8...15 => 16,
+            16...23 => 8,
+            else => unreachable,
+        };
+    }
+
+    /// Returns the register's id. This is used in practically every opcode the
+    /// x86 has. It is embedded in some instructions, such as the `B8 +rd` move
+    /// instruction, and is used in the R/M byte.
+    pub fn id(self: @This()) u3 {
+        return @truncate(u3, @enumToInt(self));
+    }
+};
+
+// zig fmt: on