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Re: [PATCH-for-6.1] target/mips: Check nanoMIPS DSP MULT[U] accumulator
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [PATCH-for-6.1] target/mips: Check nanoMIPS DSP MULT[U] accumulator with Release 6 |
Date: |
Sat, 18 Sep 2021 11:29:36 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.0 |
On 7/27/21 18:38, Richard Henderson wrote:
> On 7/26/21 10:30 PM, Philippe Mathieu-Daudé wrote:
>> Per the "MIPS Architecture Extension: nanoMIPS32 DSP TRM" rev 0.04,
>> MULT and MULTU opcodes:
>>
>> The value of ac selects an accumulator numbered from 0 to 3.
>> When ac=0, this refers to the original HI/LO register pair of the
>> MIPS32 architecture.
>>
>> In Release 6 of the MIPS Architecture, accumulators are eliminated
>> from MIPS32.
>>
>> Ensure pre-Release 6 is restricted to HI/LO registers pair.
>>
>> Fixes: 8b3698b2947 ("target/mips: Add emulation of DSP ASE for
>> nanoMIPS - part 4")
>> Signed-off-by: Philippe Mathieu-Daudé<f4bug@amsat.org>
>> ---
>> target/mips/tcg/nanomips_translate.c.inc | 6 ++++++
>> 1 file changed, 6 insertions(+)
>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Thanks, applied to mips-next.
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Philippe Mathieu-Daudé <=