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disas: nanoMIPS: Comment the decoder of 'gpr2.reg1' gpr encoding type

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Comment the decoder of 'gpr2.reg1' 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 14:38:15 +01:00
parent 4671783ac1
commit 8e2919f666
1 changed files with 22 additions and 0 deletions
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22
disas/nanomips.cpp
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@ -468,6 +468,28 @@ uint64 NMD::decode_gpr_gpr4(uint64 d)
}
/*
* NMD::decode_gpr_gpr2_reg1() - decoder for 'gpr2.reg1' 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_reg1(uint64 d)
{
static uint64 register_list[] = { 4, 5, 6, 7 };