From 07e489dc05a71fc5d96478c02a64ff93f7279551 Mon Sep 17 00:00:00 2001
From: Dimitar Trendafilov <dimitar@coherent-labs.com>
Date: Sat, 19 Dec 2020 15:38:35 +0200
Subject: Fix usage of registers in assembler demo

---
 demo/asm/add_answer.asm | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/demo/asm/add_answer.asm b/demo/asm/add_answer.asm
index 2864c3c..3bcda83 100644
--- a/demo/asm/add_answer.asm
+++ b/demo/asm/add_answer.asm
@@ -19,12 +19,16 @@ add_answer:
     push    rcx
     push    rdx
     push    rsi
-; Handle Win64 calling convention
+; "Handle" Win64 calling convention
 ;    push    rdi ; used by System V
     push    rcx ; used by Win64
     push    1
     mov     rdi, rsp
 
+    ; Make sure that we commit the stack space we are going to use with the
+    ; registers
+    sub rsp, 24
+
     mov [rdi - 8], byte 42
 
     mov r8, [rdi + 8]
@@ -33,9 +37,9 @@ add_answer:
     mov rcx, r8
     add rcx, r9
 
-    mov [rdi + 16], rcx
+    mov [rdi - 16], rcx
 
-    mov eax, [rdi + 16]
+    mov eax, [rdi - 16]
     mov rsp, r15
     pop r15
     pop rbp
-- 
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