You have already asked that question (and got an answer) in gcc-help@:
https://gcc.gnu.org/pipermail/gcc-help/2024-August/thread.html#143628 Johann Am 08.08.24 um 03:54 schrieb Amit Hiremath:
Hello, I want to add custom single precision floating point sine, cosine, exp instructions to risc-v gnu tool chain, and I have designed hardware for this. I was going through tutorials on how to add custom instructions at: https://pcotret.gitlab.io/riscv-custom/sw_toolchain.html after adding custom instructions, I think one has to use asm macro to use custom instructions in C. Is there anyway where one do not need to use this macro? I would like the compiler to automatically map to custom instructions in the risc-v processor, like how it will map to fadd.s, fmul.s instructions, where one does not need to use asm macro. I asked in riscv gnu tool chain forum about this issue: https://github.com/riscv-collab/riscv-gnu-toolchain/issues/1526 they suggested that I ask this query in the gcc forum. Can you please guide me? Many Thanks, -Amith
