Ping^1 Re: [SH] Fix mac.w insn simulation for SH2 and above

Ping

On Sun, 2026-08-02 at 22:53 +0900, Oleg Endo wrote:
> Hi,
> 
> The simulator currently implements only the SH1 version of the mac.w
> instruction.  On SH1 the MACH:MACL accumulator register is only 42-bit.  It
> was extended to 64-bit on SH2 and every variant that followed after.
> 
> The issue probably never showed up because GCC hasn't been able to emit the
> SH integer mac instructions.  I ran into this because I was trying to do
> exactly that and while running some tests on sh-sim.
> 
> The attached patch uses the bfd_mach field to distinguish between SH1 and
> not-SH1 in the simulation of the mac.w instruction, in a similar way as it's
> already been done for some SH2A instructions.
> 
> 
> OK to commit & push?
> 
> Best regards,
> Oleg Endo