RX Built-in Functions#

GCC supports some of the RX instructions which cannot be expressed in the C programming language via the use of built-in functions. The following functions are supported:

void __builtin_rx_brk(void)#: Generates the brk machine instruction.

void __builtin_rx_clrpsw(int)#: Generates the clrpsw machine instruction to clear the specified bit in the processor status word.

void __builtin_rx_int(int)#: Generates the int machine instruction to generate an interrupt with the specified value.

void __builtin_rx_machi(int, int)#: Generates the machi machine instruction to add the result of multiplying the top 16 bits of the two arguments into the accumulator.

void __builtin_rx_maclo(int, int)#: Generates the maclo machine instruction to add the result of multiplying the bottom 16 bits of the two arguments into the accumulator.

void __builtin_rx_mulhi(int, int)#: Generates the mulhi machine instruction to place the result of multiplying the top 16 bits of the two arguments into the accumulator.

void __builtin_rx_mullo(int, int)#: Generates the mullo machine instruction to place the result of multiplying the bottom 16 bits of the two arguments into the accumulator.

int __builtin_rx_mvfachi(void)#: Generates the mvfachi machine instruction to read the top 32 bits of the accumulator.

int __builtin_rx_mvfacmi(void)#: Generates the mvfacmi machine instruction to read the middle 32 bits of the accumulator.

int __builtin_rx_mvfc(int)#: Generates the mvfc machine instruction which reads the control register specified in its argument and returns its value.

void __builtin_rx_mvtachi(int)#: Generates the mvtachi machine instruction to set the top 32 bits of the accumulator.

void __builtin_rx_mvtaclo(int)#: Generates the mvtaclo machine instruction to set the bottom 32 bits of the accumulator.

void __builtin_rx_mvtc(int reg, int val)#: Generates the mvtc machine instruction which sets control register number reg to val.

void __builtin_rx_mvtipl(int)#: Generates the mvtipl machine instruction set the interrupt priority level.

void __builtin_rx_racw(int)#: Generates the racw machine instruction to round the accumulator according to the specified mode.

int __builtin_rx_revw(int)#: Generates the revw machine instruction which swaps the bytes in the argument so that bits 0–7 now occupy bits 8–15 and vice versa, and also bits 16–23 occupy bits 24–31 and vice versa.

void __builtin_rx_rmpa(void)#: Generates the rmpa machine instruction which initiates a repeated multiply and accumulate sequence.

void __builtin_rx_round(float)#: Generates the round machine instruction which returns the floating-point argument rounded according to the current rounding mode set in the floating-point status word register.

int __builtin_rx_sat(int)#: Generates the sat machine instruction which returns the saturated value of the argument.

void __builtin_rx_setpsw(int)#: Generates the setpsw machine instruction to set the specified bit in the processor status word.

void __builtin_rx_wait(void)#: Generates the wait machine instruction.