On Fri, Feb 7, 2025 at 5:51 AM Jeff Law <jeffreya...@gmail.com> wrote: > > > > On 2/7/25 5:59 AM, Andrew Waterman wrote: > > This patch runs counter to the ABI spec, which states that vxrm is not > > preserved across calls and is volatile upon function entry [1]. vxrm > > does not play the same role as frm plays in the calling convention. > > (I won't get into the rationale in this email, but the rationale isn't > > especially important: we should follow the ABI.) > > > > [1] > > https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/3a79e936eec5491078b1133ac943f91ef5fd75fd/riscv-cc.adoc?plain=1#L119-L120 > Pan's patch doesn't change the basic property that VXRM has no known > state at function entry or upon return from a function call.
Ah, GCC-internal notion of global register versus the conventional understanding of the term. My mistake. > > Jeff > >
