From 8ea8305199496ba29b6d0da2de07aea4441844aa Mon Sep 17 00:00:00 2001
From: Shinichiro Hamaji <shinichiro.hamaji _at_ gmail.com>
Date: Tue, 9 Jun 2009 03:23:08 +0900
Subject: x86-64: Add alloca.

---
 lib/alloca86_64.S | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 lib/alloca86_64.S

(limited to 'lib/alloca86_64.S')

diff --git a/lib/alloca86_64.S b/lib/alloca86_64.S
new file mode 100644
index 0000000..1751d37
--- /dev/null
+++ b/lib/alloca86_64.S
@@ -0,0 +1,33 @@
+/* ---------------------------------------------- */
+/* alloca86_64.S */
+
+#include "../config.h"
+
+.globl alloca
+
+alloca:
+    pop     %rdx
+    mov     %rdi,%rax
+    add     $3,%rax
+    and     $-4,%rax
+    jz      p3
+
+#ifdef TCC_TARGET_PE
+    /* XXX: not tested */
+p1:
+    cmp     $4096,%rax
+    jle     p2
+    sub     $4096,%rsp
+    sub     $4096,%rax
+    test    %rax,(%rsp)
+    jmp p1
+p2:
+#endif
+
+    sub     %rax,%rsp
+    mov     %rsp,%rax
+p3:
+    push    %rdx
+    ret
+
+/* ---------------------------------------------- */
-- 
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