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disas: nanoMIPS: Comment the decoder of 'gpr2.reg2' gpr encoding type

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Comment the decoder of 'gpr2.reg2' gpr encoding type in nanoMIPS
disassembler.

Reviewed-by: Aleksandar Rikalo <arikalo@wavecomp.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
This commit is contained in:
Aleksandar Markovic 2018-12-26 14:42:13 +01:00
parent ce0f2617ac
commit a21e052013
1 changed files with 22 additions and 0 deletions
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22
disas/nanomips.cpp
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@ -498,6 +498,28 @@ uint64 NMD::decode_gpr_gpr2_reg1(uint64 d)
}
/*
* NMD::decode_gpr_gpr2_reg2() - decoder for 'gpr2.reg2' gpr encoding type
*
* Map a 2-bit code to the 5-bit register space according to this pattern:
*
* 3 2 1 0
* | | | |
* | | | |
* | | | └-----------------┐
* | | └-----------------┐ |
* | └-----------------┐ | |
* └-----------------┐ | | |
* | | | |
* | | | |
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
* 3 2 1 0
*
* Used in handling following instructions:
*
* - MOVEP
* - MOVEP[REV]
*/
uint64 NMD::decode_gpr_gpr2_reg2(uint64 d)
{
static uint64 register_list[] = { 5, 6, 7, 8 };