FPC(3C)								       FPC(3C)

NAME    [Toc]    [Back]

     fpc: get_fpc_csr, set_fpc_csr, get_fpc_irr, swapRM, swapINX - floatingpoint
 control registers

SYNOPSIS    [Toc]    [Back]

     #include <sys/fpu.h>

     int get_fpc_csr(void);

     int set_fpc_csr(int csr);

     int get_fpc_irr(void);

     int swapRM(int x);

     int swapINX(int x);

DESCRIPTION    [Toc]    [Back]

     These routines are	to get and set the floating-point control registers of
     MIPS floating-point units.	 All of	these routines take and	or return
     their values as 32	bit integers.

     The file <sys/fpu.h> contains unions for each of the control registers.
     Each union	contains a structure that breaks out the bit fields into the
     logical parts for each control register.  This file also contains
     constants for fields of the control registers.

     All implementations of MIPS floating-point	have a control and status
     register and a implementation revision register.  The control and status
     register is returned by get_fpc_csr. The routine set_fpc_csr sets the
     control and status	register and returns the old value.  The
     implementation revision register is read-only and is returned by the
     routine get_fpc_irr.

     The routine swapRM	sets only the rounding mode and	returns	the old
     rounding mode.  The routine swapINX sets only the sticky inexact bit and
     returns the old one.  The bits in the arguments and return	values to
     swapRM and	swapINX	are right justified.

NOTES    [Toc]    [Back]

     swapRM and	swapINX	are in libm.a .	The link editor	searches this library
     under the "-lm" option.

ALSO SEE    [Toc]    [Back]

     R4000 Microprocessor User's Manual


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