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write_rnd(3) Library Functions Manual write_rnd(3) NAME write_rnd, read_rnd - Sets and returns IEEE dynamic rounding mode for floating-point operations LIBRARY 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 specifying -fprm d 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 tab(@); lfHB lfHB l l. _ Constant@Meaning _ FP_RND_RZ@T{ Round toward zero (chopped rounding) T} FP_RND_RN@T{ Round toward nearest (normal rounding) T} FP_RND_RP@T{ Round toward plus infinity T} FP_RND_RM@T{ Round toward minus infinity T} _ 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 round- ing 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)