Binary floating-Point instructions

These functions are intended to generate binary floating-point instructions. These instructions will only be generated if the FLOAT(IEEE) option is in effect. For more information about the instructions themselves, see the topic of z/Architecture Principles of Operation.

If you want to use any of the following functions, your program must include builtins.h and be compiled with either the LANGLVL(EXTENDED) option or the LANGLVL(LIBEXT) and FLOAT(IEEE) options.

Table 1. Binary floating-point instruction prototypes
PROTOTYPE and Notes	Sample Pseudo Assembly	MIN ARCH
`int __cfdbr(int *Op1, int M3, double Op2)` The return value is the condition code.	`CFDBR R2,M3,Op2 LR *Op3,R2`	`ARCH(3)`
`int __cfebr(int *Op1, int M3, float Op2)` The return value is the condition code.	`CFEBR R2,M3,Op2 LR *Op3,R2`	`ARCH(3)`
`int __cfxbr(int *Op1, int M3, long double Op2)` The return value is the condition code.	`CFXBR R2,M3,Op2 LR *Op3,R2`	`ARCH(3)`
`int __efpc(void)` The return value is the z/Architecture FPC. Note: Also see functions that get and set FPC rounding modes and Definitions that support FPC register-rounding macros.	`EFPC R1`	`ARCH(3)`
`float __fiebr(int M3, float Op2)` The return value is the result.	`FIEBR F1,M3,Op2`	`ARCH(3)`
`float __fmadds(float Op1, float Op2, float Op3)` The return value is the result.	`FMADDS Op1,Op3,Op2`	`ARCH(3)`
`double __fidbr(int M3, double Op2)` The return value is the result.	`FIDBR F1,M3,Op2`	`ARCH(3)`
`long double __fixbr(int M3, long double Op2)` The return value is the result.	`FIXBR F1,M3,Op2`	`ARCH(3)`
`int __didbr(double rem, double quotient, double Op3, double Op4 int M4)` The return value is the condition code.	`LDR F1,Op3 DIDBR F1,F3,Op4,M4 LDR rem,F1 LDR quotient,F3`	`ARCH(3)`
`int __lndbr(double *Op1, double Op2)` The return value is the condition code.	`LDR F1,Op1 LNDBR F1,Op2 LDR Op1,F1`	`ARCH(3)`
`int __lnxbr(long double *Op1, long double Op2)` The return value is the condition code.	`LDR F1,Op1 LNXBR F1,Op2 LDR Op1,F1`	`ARCH(3)`
`int __lpdbr(double *Op1, double Op2)` The return value is the condition code.	`LDR F1,Op1 LPDBR F1,Op2 LDR Op1,F1`	`ARCH(3)`
`int __lpxbr(long double *Op1, long double Op2)` The return value is the condition code.	`LDR F1,Op1 LPXBR F1,Op2 LDR Op1,F1`	`ARCH(3)`
`int __diebr(float rem, float quotient, float Op3, float Op4, int M4)` The return value is the condition code.	`LER F1,Op3 DIEBR F1,F3,Op4,M4 LER rem,F1 LER quotient,F3`	`ARCH(3)`
`int __lnebr(float *Op1, float Op2)` The return value is the condition code.	`LER F1,Op1 LNEBR F1,Op2 LER Op1,F1`	`ARCH(3)`
`int __lpebr(float *Op1, float Op2)` The return value is the condition code.	`LER F1,Op1 LPEBR F1,Op2 LER Op1,F1`	`ARCH(3)`
`double __madbr(double Op1, double Op2, double Op3)` The return value is the result.	`MADBR Op1,Op3,Op2`	`ARCH(3)`
`float __maebr(float Op1, float Op2, float Op3)` The return value is the result.	`MAEBR Op1,Op3,Op2`	`ARCH(3)`
`double __msdbr(double Op1, double Op2, double Op3)` The return value is the condition code.	`MSDBR Op1,Op3,Op2`	`ARCH(3)`
`float __msebr(float Op1, float Op2, float Op3)` The return value is the result.	`MSEBR Op1,Op3,Op2`	`ARCH(3)`
`void __sfpc(int Op1)` Only a constant literal can be passed to this built-in function. Note: See Definitions that support FPC register-rounding macros.	`SFPC Op1`	`ARCH(3)`
`float __sqebr(float Op2)` The return value is the square root.	`SQEBR F1,Op2`	`ARCH(3)`
`double __sqdbr(double Op2)` The return value is the square root.	`SQDBR F1,Op2`	`ARCH(3)`
`long double __sqxbr(long double Op2)` The return value is the square root.	`SQXBR F1,Op2`	`ARCH(3)`
`void __srnm(int Op1)`	`SRNM Op1`	`ARCH(3)`
`int __tceb(float Op1, int Op2)` The return value is the condition code.	`TCEB Op1,Op2(0,0)`	`ARCH(3)`
`int __tcdb(double Op1, int Op2)` The return value is the condition code.	`TCDB Op1,Op2(0,0)`	`ARCH(3)`
`int __tcxb(long double Op1, int Op2)` The return value is the condition code.	`TCXB Op1,Op2(0,0)`	`ARCH(3)`