# write_rnd(3) [osf1 man page]

write_rnd(3) Library Functions Manual write_rnd(3)NAME

write_rnd, read_rnd - Sets and returns IEEE dynamic rounding mode for floating-point operationsLIBRARY

Standard C Library (libc.so, libc.a)SYNOPSIS

#include <float.h> unsigned int write_rnd( unsigned int rnd); unsigned int read_rnd();DESCRIPTION

The write_rnd function sets the dynamic rounding mode in the floating-point control register (fpcr) for IEEE floating-point operations and returns the previous dynamic rounding mode. Dynamic rounding mode for IEEE floating-point operations is enabled for code generated by the C compiler by specifyingd to cc(1), and by using the d floating-point instruction operator in assembly language code. Specify rnd as one of the following constants defined in float.h-fprmConstant Meaning---------------------------------------------------FP_RND_RZ Round toward zero (chopped rounding) FP_RND_RN Round toward nearest (normal rounding) FP_RND_RP Round toward plus infinity FP_RND_RM Round toward minus infinity---------------------------------------------------The read_rnd function returns the current dynamic rounding mode for floating-point operations.---------------------------------------------------RETURN VALUES

The write_rnd function returns the previous IEEE floating-point rounding mode. The read_rnd function returns the current IEEE floating- point rounding mode.RELATED INFORMATION

Commands: cc(1). Files: float.h. Assembly Language Programmer's Guide. Alpha Architecture Reference Manual. IEEE Standard for Binary Floating-Point Arithmetic delim off write_rnd(3)

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NAME

write_rnd, read_rnd - Sets and returns IEEE dynamic rounding mode for floating-point operationsLIBRARY

Standard C Library (libc.so, libc.a)SYNOPSIS

#include <float.h> unsigned int write_rnd( unsigned int rnd); unsigned int read_rnd();DESCRIPTION

The write_rnd function sets the dynamic rounding mode in the floating-point control register (fpcr) for IEEE floating-point operations and returns the previous dynamic rounding mode. Dynamic rounding mode for IEEE floating-point operations is enabled for code generated by the C compiler by specifyingd to cc(1), and by using the d floating-point instruction operator in assembly language code. Specify rnd as one of the following constants defined in float.h-fprmConstant Meaning---------------------------------------------------FP_RND_RZ Round toward zero (chopped rounding) FP_RND_RN Round toward nearest (normal rounding) FP_RND_RP Round toward plus infinity FP_RND_RM Round toward minus infinity---------------------------------------------------The read_rnd function returns the current dynamic rounding mode for floating-point operations.---------------------------------------------------RETURN VALUES

The write_rnd function returns the previous IEEE floating-point rounding mode. The read_rnd function returns the current IEEE floating- point rounding mode.RELATED INFORMATION

Commands: cc(1). Files: float.h. Assembly Language Programmer's Guide. Alpha Architecture Reference Manual. IEEE Standard for Binary Floating-Point Arithmetic delim off write_rnd(3)