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[NFC] Referencing manual for reason why subregbit is checked

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259380 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Colin LeMahieu 2016-02-01 18:15:39 +00:00
parent 16d21f4524
commit 83948c56bd
1 changed files with 2 additions and 1 deletions
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3
lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp
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@ -382,7 +382,8 @@ DecodeStatus HexagonDisassembler::getSingleInstruction(
if (Producer >= Hexagon::W0 && Producer <= Hexagon::W15)
Producer = ((Producer - Hexagon::W0) << 1) + SubregBit + Hexagon::V0;
else if (SubregBit)
// Subreg bit should not be set for non-doublevector newvalue producers
// Hexagon PRM 10.11 New-value operands
// Nt[0] is reserved and should always be encoded as zero.
return MCDisassembler::Fail;
assert(Producer != Hexagon::NoRegister);
MCO.setReg(Producer);