Re: [PATCH] rl78 anddi3 improvement

Jeff Law writes: > So I think you're ultimately far better off determining why GCC does not > generate efficient code for 64bit logicals on the rl78 target. In thinking about this more, one possible reason is that rl78 has an 8-bit WORD_MODE. Which means DImode operations are

Re: [PATCH] rl78 anddi3 improvement

Right, when doing 64-bit operations on an 8-bit mcu with limited registers, a hand-written assembler routine that you call as needed will beat anything gcc spits out - for size-per-call. And I had a lot of trouble getting gcc to deal with the rl78's limited register set and addressing modes -

RE: [PATCH] rl78 anddi3 improvement

Hello Jeff, Thank you for your comments. >>So I think you're ultimately far better off determining why GCC does not >>generate efficient code for 64bit logicals on the rl78 target. I totally agree with you, this is why: 1. I have another patch: I define_expand movdi in which I instruct GCC to

Re: [PATCH] rl78 anddi3 improvement

On 12/08/2017 07:50 AM, Sebastian Perta wrote: > Hello, > > The following patch improves code size for 64 bit and for RL78: > it emits a library function call instead of emitting code for the 64 bit > min for every single time. > The and function which was added in libgcc is hand written, so