1 files changed, 89 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/math/ldexp.asm b/src/VBox/Runtime/common/math/ldexp.asm
new file mode 100644
index 00000000..257c4172
--- /dev/null
+++ b/src/VBox/Runtime/common/math/ldexp.asm
@@ -0,0 +1,89 @@
+; $Id: ldexp.asm $
+;; @file
+; IPRT - No-CRT ldexp - AMD64 & X86.
+;
+
+;
+; Copyright (C) 2006-2023 Oracle and/or its affiliates.
+;
+; This file is part of VirtualBox base platform packages, as
+; available from https://www.virtualbox.org.
+;
+; This program is free software; you can redistribute it and/or
+; modify it under the terms of the GNU General Public License
+; as published by the Free Software Foundation, in version 3 of the
+; License.
+;
+; This program is distributed in the hope that it will be useful, but
+; WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+; General Public License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with this program; if not, see <https://www.gnu.org/licenses>.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+; in the VirtualBox 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.
+;
+; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+;
+
+
+%define RT_ASM_WITH_SEH64
+%include "iprt/asmdefs.mac"
+
+
+BEGINCODE
+
+;;
+; Computes rd * 2^exp
+; @returns st(0) / xmm0
+; @param    rd      [rbp + xCB*2] / xmm0
+; @param    exp     [ebp + 10h]  gcc:edi  msc:edx
+RT_NOCRT_BEGINPROC ldexp
+        push    xBP
+        SEH64_PUSH_xBP
+        mov     xBP, xSP
+        SEH64_SET_FRAME_xBP 0
+        sub     xSP, 10h
+        SEH64_ALLOCATE_STACK 10h
+        SEH64_END_PROLOGUE
+
+        ;
+        ; Load the value and scaling factor.
+        ;
+%ifdef RT_ARCH_AMD64
+ %ifdef ASM_CALL64_GCC
+        mov     [rbp - 8h], edi
+ %else
+        mov     [rbp - 8h], edx
+ %endif
+        fild    dword [rbp - 8h]
+        movsd   [rbp - 10h], xmm0
+        fld     qword [rbp - 10h]
+%else
+        fild    dword [xBP + xCB*2 + 8]
+        fld     qword [xBP + xCB*2]
+%endif
+
+        ;
+        ; Do the scaling and return the result.
+        ;
+        fscale
+
+        fstp    st1
+%ifdef RT_ARCH_AMD64
+        fstp    qword [rbp - 10h]
+        movsd   xmm0, [rbp - 10h]
+%endif
+
+        leave
+        ret
+ENDPROC   RT_NOCRT(ldexp)
+