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Date:	Mon, 6 Oct 2014 17:11:38 -0700
From:	Andrew Pinski <>
To:	Rich Felker <>
Cc:	David Daney <>,
	Andy Lutomirski <>,
	David Daney <>,
	GNU C Library <>,
	LKML <>,,
	David Daney <>
Subject: Re: [PATCH resend] MIPS: Allow FPU emulator to use non-stack area.

On Mon, Oct 6, 2014 at 5:05 PM, Rich Felker <> wrote:
> On Mon, Oct 06, 2014 at 04:48:52PM -0700, David Daney wrote:
>> On 10/06/2014 04:38 PM, Andy Lutomirski wrote:
>> >On 10/06/2014 02:58 PM, Rich Felker wrote:
>> >>On Mon, Oct 06, 2014 at 02:45:29PM -0700, David Daney wrote:
>> [...]
>> >>This is a huge ill-designed mess.
>> >
>> >Amen.
>> >
>> >Can the kernel not just emulate the instructions directly?
>> In theory it could, but since there can be implementation defined
>> instructions, there is no way to achieve full instruction set
>> coverage for all possible machines.
> Is the issue really implementation-defined instructions with delay
> slots? If so it sounds like a made-up issue. They're not going to
> occur in real binaries. Certainly a compiler is not going to generate
> implementation-defined instructions, and if you're writing the asm by
> hand, you just don't put floating point instructions in the delay
> slot.

It is not the instruction with delay slot but rather the instruction
in the delay slot itself.

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