floorl.asm revision 7db630a55be9d955c8ac125da609b304cbcc6010
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync; IPRT - No-CRT floorl - AMD64 & X86.
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync; Copyright (C) 2006-2007 Sun Microsystems, Inc.
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync; This file is part of VirtualBox Open Source Edition (OSE), as
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a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync; Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync; additional information or have any questions.
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync%ifdef RT_ARCH_AMD64
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync %define _SP rsp
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync %define _BP rbp
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync %define _S 8
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync %define _SP esp
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync %define _BP ebp
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync %define _S 4
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync; Compute the largest integral value not greater than lrd.
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync; @returns st(0)
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync; @param lrd [rbp + 8]
7db630a55be9d955c8ac125da609b304cbcc6010vboxsyncBEGINPROC RT_NOCRT(floorl)
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync mov _BP, _SP
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync sub _SP, 10h
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync fld tword [_BP + _S*2]
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync ; Make it round down by modifying the fpu control word.
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync fstcw [_BP - 10h]
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync mov eax, [_BP - 10h]
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync or eax, 00400h
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync and eax, 0f7ffh
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync mov [_BP - 08h], eax
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync fldcw [_BP - 08h]
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync ; Round ST(0) to integer.
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync ; Restore the fpu control word.
7db630a55be9d955c8ac125da609b304cbcc6010vboxsync fldcw [_BP - 10h]
7db630a55be9d955c8ac125da609b304cbcc6010vboxsyncENDPROC RT_NOCRT(floorl)