The instruction sequence generated by gcc can be simply rewritten by
three instructions.
Apparently gcc should find the expression storing to bit-field and use
pattern insv. But it didn't.
gcc:
10: 3c03fff3 lui v1,0xfff3
14: 3463ffff ori v1,v1,0xffff
18: 8ca20000 lw v0,0(a1)
1c: 3c040008 lui a0,0x8
20: 00431824 and v1,v0,v1
24: 00641825 or v1,v1,a0
with ins:
lw v0,0(a1)
ori a0, $0, 2
ins v0,v0,19,18
2009/12/18 Ineiev <ineiev@xxxxxxxxx>:
> On 12/18/09, fanqifei <fanqifei@xxxxxxxxx> wrote:
>> Is there anyone can help?
>> I am curious about how the insv pattern can be used in the compiling
>> process.
>> Otherwise, I have to write inline assembly code.
>
> Out of curiosity --- why do you think your executable has to use this pattern?
>
> Regards,
> Ineiev
>
--
Qifei Fan
