From 7c3fadc1496d4b9ebb2668d300bc7cb9be11b459 Mon Sep 17 00:00:00 2001
From: MESYETI <mesyeti@protonmail.com>
Date: Fri, 22 Nov 2024 14:08:55 +0000
Subject: [PATCH] fix alignment on C interop in x86_64 backend

---
 source/backends/x86_64.d | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/source/backends/x86_64.d b/source/backends/x86_64.d
index bf36615..2e4f578 100644
--- a/source/backends/x86_64.d
+++ b/source/backends/x86_64.d
@@ -515,6 +515,17 @@ class BackendX86_64 : CompilerBackend {
 					output ~= "mov rbp, rsp\n";
 					output ~= "and rsp, 0xFFFFFFFFFFFFFFF0\n";
 
+					size_t alignSize = word.params.length * 8;
+
+					while (alignSize % 16 != 0) {
+						alignSize += 8;
+					}
+					alignSize -= word.params.length * 8;
+
+					if (alignSize > 0) {
+						output ~= format("sub rsp, %d\n", alignSize);
+					}
+
 					if (word.params.length > 6) {
 						// push parameters
 						foreach_reverse (i ; 6 .. word.params.length) {