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Date: Wed, 12 Apr 2017 21:25:35 +0200
From: Szabolcs Nagy <>
Cc: Jaydeep Patil <>
Subject: Re: microMIPS32R2 O32 port

* Jaydeep Patil <> [2017-04-12 11:54:10 +0000]:
> Hi Rich,
> We can reuse existing MIPS code for microMIPS. There are places where we read from $ra must be compiled for MIPS.
> Please refer to for modifications.

is micromips a different encoding for mips instructions
that works on some cpus but not others?

does it require musl changes because micromips does not
support all mips instructions just a subset?

> Thanks,
> Jaydeep
> >-----Original Message-----
> >From: Rich Felker [] On Behalf Of Rich Felker
> >Sent: 07 April 2017 PM 07:50
> >To:
> >Subject: Re: [musl] [MUSL] microMIPS32R2 O32 port
> >
> >On Fri, Apr 07, 2017 at 06:47:57AM +0000, Jaydeep Patil wrote:
> >> Hi Rich,
> >>
> >> microMIPS is an Application Specific Extension (ASE) to MIPS cores.
> >> Both microMIPS and MIPS can co-exist. MIPS code can call microMIPS and
> >> vice-versa. microMIPS is a compressed ISA and contains both 16 and
> >> 32-bit instructions for code size benefit.
> >
> >In that case I'm confused what the benefit of compiling the asm files as
> >micromips rather than plain mips is. Is it just to save 10 bytes here and there?
> >
> >Rich

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