On Thu, Nov 12, 2020 at 10:56 PM Monk Chiang <monk.chi...@sifive.com> wrote:
> - When expanding the call pattern, choose t1 register be a jump register. > Epilogue also uses a t1 register to adjust Stack point. The call > pattern > and epilogue will initial t1 twice, if both are generated in the same > function. The call pattern will emit 'la t1,symbol' and 'jalr > t1'instructions. > Epilogue also emits 'li t1,4096' and 'addi sp,sp,t1' instructions. > But li and addi instructions will be placed between la and jalr > instructions. > The la instruction will be removed by some optimizations, > because t1 register define twice, the first define instruction look > likes duplicate. > Thanks. Committed and pushed. Jim
