Hi Heinrich, On Thu, 28 Sept 2023 at 00:26, Heinrich Schuchardt <[email protected]> wrote: > > On 9/28/23 04:41, Simon Glass wrote: > > Hi Bin, > > > > U-Boot 64-bit on x86 disables sse, but when enabling Truetype I get a > > compiler error: > > > > drivers/video/console_truetype.c: In function 'frac': > > drivers/video/console_truetype.c:30:15: error: SSE register return > > with SSE disabled > > 30 | static double frac(double val) > > > > Do you know how to enable SSE for 64-bit? > > How could this occur if x86 disables SSE? There must be some > inconsistency in how this module is built.
We disable SSE on 64-bit x86, even though the CPU always supports it. The compiler assumes it is available, so presumably emits SSE things. I suspect there is some CPU init missing after U-Boot changes to 64-bit long mode. > > We a need a clarification of the used ABI per architecture and write > this into our documentation. > > The RISC-V profile specification does not foresee float and double in > S-mode (see RVA20S64 and RVAS22S64 profiles in > https://github.com/riscv/riscv-profiles/blob/main/profiles.adoc#52-rva20s64-profile). > > We should convert drivers/video/console_truetype.c to use integers > (where low bits are used for the fractional part) instead of float and > double to make the driver compatible to non-x86 platforms. Good luck with that :-) It uses STB for Truetype...probably there is an integer implementation somewhere but I'm not sure. Regards, Simon
