From d8ad916c80ce1e1dcfeabb8441896e94f7f00568 Mon Sep 17 00:00:00 2001
From: Frederick Yin <fkfd@fkfd.me>
Date: Mon, 22 Aug 2022 17:33:07 +0800
Subject: hack-vm: optimize pop by one instruction

---
 projects/hack-vm/memory.py | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/projects/hack-vm/memory.py b/projects/hack-vm/memory.py
index ad22482..84f4a53 100644
--- a/projects/hack-vm/memory.py
+++ b/projects/hack-vm/memory.py
@@ -44,8 +44,7 @@ D=A
 @{segment}
 M=M+D
 @SP
-M=M-1
-A=M
+AM=M-1
 D=M
 @{segment}
 A=M
@@ -58,8 +57,7 @@ M=M-D
 
 # when <segment> is one of static, temp and pointer
 POP_FIXED_ASM = """@SP
-M=M-1
-A=M
+AM=M-1
 D=M
 @{addr}
 M=D
-- 
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