Thanks for checking this, Maciej, [ Cc-ing Jia Liu, who added MIPS ASE DSP support in commit 4133498f8e532f "Use correct acc value to index cpu_HI/cpu_LO rather than using a fix number", in case there are known ISA deviations. ]
> However `gen_HILO' looks wrong to me as it'll truncate the values of > $acc3-$acc1 with the 64-bit DSP ASE. I can post a patch to fix gen_HILO. The best reference I have found so far is "MIPS Architecture for Programmers Volume IV-e: MIPS DSP Module for microMIPS64 Architecture" https://s3-eu-west-1.amazonaws.com/downloads-mips/documents/MD00765-2B-microMIPS64DSP-AFP-03.02.pdf that says MFHI: GPR[rds]63..0 <- HI[ac]63..0 MFLO: GPR[rdt]63..0 <- LO[ac]63..0 MTHI: HI[ac]63..0 <- GPR[rs]63..0 MTLO: LO[ac]63..0 <- GPR[rs]63..0 where ac can range from 0 to 3. Do you have a link to a better reference, by chance, that isn't tied to microMIPS? Fredrik
