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disas: nanoMIPS: Comment the decoder of 'gpr4.zero' gpr encoding type
Comment the decoder of 'gpr4.zero' gpr encoding type in nanoMIPS disassembler. Reviewed-by: Aleksandar Rikalo <arikalo@wavecomp.com> Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
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@ -397,6 +397,33 @@ uint64 NMD::encode_rd1_from_rd(uint64 d)
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/*
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* NMD::decode_gpr_gpr4_zero() - decoder for 'gpr4.zero' gpr encoding type
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*
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* Map a 4-bit code to the 5-bit register space according to this pattern:
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*
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* 1 0
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* 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* | | | | | | | | | | | | | | | |
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* | | | | | | | | | | | | └---------------------┐
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* | | | | | | | | | | | └---------------┐ |
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* | | | | | | | | | | └---------------┐ | |
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* | | | | | | | | | └---------------┐ | | |
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* | | | | | | | | └---------------┐ | | | |
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* | | | | | | | | | | | | | | | |
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* | | | | | | | | | | | | | | | |
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* 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
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* 3 2 1 0
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*
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* This pattern is the same one used for 'gpr4' gpr encoding type, except for
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* the input value 3, that is mapped to the output value 0 instead of 11.
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*
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* Used in handling following instructions:
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*
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* - MOVE.BALC
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* - MOVEP
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* - SW[4X4]
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*/
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uint64 NMD::decode_gpr_gpr4_zero(uint64 d)
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uint64 NMD::decode_gpr_gpr4_zero(uint64 d)
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{
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{
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static uint64 register_list[] = { 8, 9, 10, 0, 4, 5, 6, 7,
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static uint64 register_list[] = { 8, 9, 10, 0, 4, 5, 6, 7,
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