1 files changed, 62 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/math/tanl.asm b/src/VBox/Runtime/common/math/tanl.asm
new file mode 100644
index 00000000..5b3a954c
--- /dev/null
+++ b/src/VBox/Runtime/common/math/tanl.asm
@@ -0,0 +1,62 @@
+; $Id: tanl.asm $
+;; @file
+; IPRT - No-CRT tanl - AMD64 & X86.
+;
+
+;
+; Copyright (C) 2006-2019 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+%include "iprt/asmdefs.mac"
+
+BEGINCODE
+
+;;
+; Compute the sine of lrd
+; @returns st(0)
+; @param    lrd     [xSP + xCB*2]
+BEGINPROC RT_NOCRT(tanl)
+    push    xBP
+    mov     xBP, xSP
+    sub     xSP, 10h
+
+    fld     tword [xBP + xCB*2]
+    fptan
+    fnstsw  ax
+    test    ah, 04h                     ; check for C2
+    jz      .done
+
+    fldpi
+    fadd    st0
+    fxch    st1
+.again:
+    fprem1
+    fnstsw  ax
+    test    ah, 04h
+    jnz     .again
+    fstp    st1
+    fptan
+
+.done:
+    fstp    st0
+    leave
+    ret
+ENDPROC   RT_NOCRT(tanl)
+