Source code of Windows XP (NT5)
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//##########################################################################
//**
//** Copyright (C) 1996-2000 Intel Corporation. All rights reserved.
//**
//** The information and source code contained herein is the exclusive
//** property of Intel Corporation and may not be disclosed, examined
//** or reproduced in whole or in part without explicit written authorization
//** from the company.
//**
//###########################################################################
.file "fpsr.s"
.section .text
.align 32
.proc __set_fpsr#
.global __set_fpsr#
__set_fpsr:
alloc r31=ar.pfs,1,1,0,0 // r32, r33
// &fpsr is in r32
// load new fpsr in r33
ld8 r33 = [r32];;
// set new value of FPSR
mov ar40 = r33;;
// return
br.ret.sptk b0
.endp __set_fpsr
.proc __get_fpsr#
.global __get_fpsr#
__get_fpsr:
alloc r31=ar.pfs,1,1,0,0 // r32, r33
// &fpsr is in r32
// get old value of FPSR
mov r33 = ar40;;
// store new fpsr from r33
st8 [r32] = r33;;
// return
br.ret.sptk b0
.endp __get_fpsr