LoongArch Base Built-in Functions (Using the GNU Compiler Collection (GCC))

6.60.14 LoongArch Base Built-in Functions

These built-in functions are available for LoongArch.

Data Type Description:

imm0_31, a compile-time constant in range 0 to 31;
imm0_16383, a compile-time constant in range 0 to 16383;
imm0_32767, a compile-time constant in range 0 to 32767;
imm_n2048_2047, a compile-time constant in range -2048 to 2047;

The intrinsics provided are listed below:

    unsigned int __builtin_loongarch_movfcsr2gr (imm0_31)
    void __builtin_loongarch_movgr2fcsr (imm0_31, unsigned int)
    void __builtin_loongarch_cacop_d (imm0_31, unsigned long int, imm_n2048_2047)
    unsigned int __builtin_loongarch_cpucfg (unsigned int)
    void __builtin_loongarch_asrtle_d (long int, long int)
    void __builtin_loongarch_asrtgt_d (long int, long int)
    long int __builtin_loongarch_lddir_d (long int, imm0_31)
    void __builtin_loongarch_ldpte_d (long int, imm0_31)

    int __builtin_loongarch_crc_w_b_w (char, int)
    int __builtin_loongarch_crc_w_h_w (short, int)
    int __builtin_loongarch_crc_w_w_w (int, int)
    int __builtin_loongarch_crc_w_d_w (long int, int)
    int __builtin_loongarch_crcc_w_b_w (char, int)
    int __builtin_loongarch_crcc_w_h_w (short, int)
    int __builtin_loongarch_crcc_w_w_w (int, int)
    int __builtin_loongarch_crcc_w_d_w (long int, int)

    unsigned int __builtin_loongarch_csrrd_w (imm0_16383)
    unsigned int __builtin_loongarch_csrwr_w (unsigned int, imm0_16383)
    unsigned int __builtin_loongarch_csrxchg_w (unsigned int, unsigned int, imm0_16383)
    unsigned long int __builtin_loongarch_csrrd_d (imm0_16383)
    unsigned long int __builtin_loongarch_csrwr_d (unsigned long int, imm0_16383)
    unsigned long int __builtin_loongarch_csrxchg_d (unsigned long int, unsigned long int, imm0_16383)

    unsigned char __builtin_loongarch_iocsrrd_b (unsigned int)
    unsigned short __builtin_loongarch_iocsrrd_h (unsigned int)
    unsigned int __builtin_loongarch_iocsrrd_w (unsigned int)
    unsigned long int __builtin_loongarch_iocsrrd_d (unsigned int)
    void __builtin_loongarch_iocsrwr_b (unsigned char, unsigned int)
    void __builtin_loongarch_iocsrwr_h (unsigned short, unsigned int)
    void __builtin_loongarch_iocsrwr_w (unsigned int, unsigned int)
    void __builtin_loongarch_iocsrwr_d (unsigned long int, unsigned int)

    void __builtin_loongarch_dbar (imm0_32767)
    void __builtin_loongarch_ibar (imm0_32767)

    void __builtin_loongarch_syscall (imm0_32767)
    void __builtin_loongarch_break (imm0_32767)

Note:Since the control register is divided into 32-bit and 64-bit, but the access instruction is not distinguished. So GCC renames the control instructions when implementing intrinsics.

Take the csrrd instruction as an example, built-in functions are implemented as follows:

  __builtin_loongarch_csrrd_w  // When reading the 32-bit control register use.
  __builtin_loongarch_csrrd_d  // When reading the 64-bit control register use.

For the convenience of use, the built-in functions are encapsulated, the encapsulated functions and __drdtime_t, __rdtime_t are defined in the larchintrin.h. So if you call the following function you need to include larchintrin.h.

     typedef struct drdtime{
            unsigned long dvalue;
            unsigned long dtimeid;
     } __drdtime_t;

     typedef struct rdtime{
            unsigned int value;
            unsigned int timeid;
     } __rdtime_t;

    __drdtime_t __rdtime_d (void)
    __rdtime_t  __rdtimel_w (void)
    __rdtime_t  __rdtimeh_w (void)
    unsigned int  __movfcsr2gr (imm0_31)
    void __movgr2fcsr (imm0_31, unsigned int)
    void __cacop_d (imm0_31, unsigned long, imm_n2048_2047)
    unsigned int  __cpucfg (unsigned int)
    void __asrtle_d (long int, long int)
    void __asrtgt_d (long int, long int)
    long int  __lddir_d (long int, imm0_31)
    void __ldpte_d (long int, imm0_31)

    int  __crc_w_b_w (char, int)
    int  __crc_w_h_w (short, int)
    int  __crc_w_w_w (int, int)
    int  __crc_w_d_w (long int, int)
    int  __crcc_w_b_w (char, int)
    int  __crcc_w_h_w (short, int)
    int  __crcc_w_w_w (int, int)
    int  __crcc_w_d_w (long int, int)

    unsigned int  __csrrd_w (imm0_16383)
    unsigned int  __csrwr_w (unsigned int, imm0_16383)
    unsigned int  __csrxchg_w (unsigned int, unsigned int, imm0_16383)
    unsigned long  __csrrd_d (imm0_16383)
    unsigned long  __csrwr_d (unsigned long, imm0_16383)
    unsigned long  __csrxchg_d (unsigned long, unsigned long, imm0_16383)

    unsigned char   __iocsrrd_b (unsigned int)
    unsigned short  __iocsrrd_h (unsigned int)
    unsigned int  __iocsrrd_w (unsigned int)
    unsigned long  __iocsrrd_d (unsigned int)
    void __iocsrwr_b (unsigned char, unsigned int)
    void __iocsrwr_h (unsigned short, unsigned int)
    void __iocsrwr_w (unsigned int, unsigned int)
    void __iocsrwr_d (unsigned long, unsigned int)

    void __dbar (imm0_32767)
    void __ibar (imm0_32767)

    void __syscall (imm0_32767)
    void __break (imm0_32767)