[Predef-contribute] RISC-V architecture defines

[Aaron F. <arn...@ya...>]

Hello,
For this page which lists architecture defines: https://sourceforge.net/p/predef/wiki/Architectures/
The page is missing defines for RISC-V. Here they are. These are pulled from GCC 9.3 and Clang 10.0 on a 64-bit RISC-V virtual machine (architecture rv64gc).
GCC:  #define __riscv 1
#define __riscv_atomic 1UL
#define __riscv_cmodel_pic 1
#define __riscv_compressed 1
#define __riscv_div 1
#define __riscv_fdiv 1
#define __riscv_flen 64
#define __riscv_float_abi_double 1
#define __riscv_fsqrt 1
#define __riscv_mul 1
#define __riscv_muldiv 1
#define __riscv_xlen 64
Clang/LLVM:
#define __riscv 1
#define __riscv_atomic 1
#define __riscv_cmodel_medlow 1
#define __riscv_compressed 1
#define __riscv_div 1
#define __riscv_fdiv 1
#define __riscv_flen 64
#define __riscv_float_abi_double 1
#define __riscv_fsqrt 1
#define __riscv_mul 1
#define __riscv_muldiv 1
#define __riscv_xlen 64

These are defined on both (ignoring the difference for atomic of "1UL" for GCC and "1" for Clang/LLVM).
#define __riscv 1
#define __riscv_atomic 1#define __riscv_compressed 1#define __riscv_div 1
#define __riscv_fdiv 1#define __riscv_flen 64
#define __riscv_float_abi_double 1#define __riscv_fsqrt 1
#define __riscv_mul 1
#define __riscv_muldiv 1#define __riscv_xlen 64

This is unique to GCC:#define __riscv_cmodel_pic 1

 This is unique to Clang/LLVM:#define __riscv_cmodel_medlow 1

Please add this information to your list.

Thanks,
Aaron Franke