From d29dd5834b9d7386bb88e44bd2852428863cae81 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 15 Jul 2020 22:36:35 -0700
Subject: stage2: local consts

These are now supported enough that this example code hits the
limitations of the register allocator:

fn add(a: u32, b: u32) void {
    const c = a + b; // 7
    const d = a + c; // 10
    const e = d + b; // 14
    assert(e == 14);
}
// error: TODO implement copyToNewRegister

So now the next step is to implement register allocation as planned.
---
 src-self-hosted/codegen.zig | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src-self-hosted/codegen.zig')

diff --git a/src-self-hosted/codegen.zig b/src-self-hosted/codegen.zig
index 314d497808..e78ee28b5d 100644
--- a/src-self-hosted/codegen.zig
+++ b/src-self-hosted/codegen.zig
@@ -73,6 +73,7 @@ pub fn generateSymbol(
                 .code = code,
                 .err_msg = null,
                 .args = mc_args,
+                .arg_index = 0,
                 .branch_stack = &branch_stack,
                 .src = src,
             };
@@ -255,6 +256,7 @@ const Function = struct {
     code: *std.ArrayList(u8),
     err_msg: ?*ErrorMsg,
     args: []MCValue,
+    arg_index: usize,
     src: usize,
 
     /// Whenever there is a runtime branch, we push a Branch onto this stack,
@@ -603,7 +605,9 @@ const Function = struct {
     }
 
     fn genArg(self: *Function, inst: *ir.Inst.Arg) !MCValue {
-        return self.args[inst.args.index];
+        const i = self.arg_index;
+        self.arg_index += 1;
+        return self.args[i];
     }
 
     fn genBreakpoint(self: *Function, src: usize, comptime arch: std.Target.Cpu.Arch) !MCValue {
-- 
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