GCC complains about signed-vs-unsigned comparison. I'm actually surprised that m_registers_count is a signed integer, as I can hardly imagine a negative register count. I'm under the impression that we could change m_register_count fields to be unsigned, but that would be a larger change. Thoughts?
I'm getting more convinced the warning emitted by GCC is bogus
/home/davide/work/llvm-lldb/tools/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_mips64.cpp:58:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(m_num_registers == m_registers_count[gpr_registers_count] + ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ m_registers_count[fpr_registers_count] + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ m_registers_count[msa_registers_count]); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
And I was wrong. @nlewycky explained on IRC:
14:23 < nlewycky> gcc is correct, in 'char + char' each char gets promoted to 'int' first then summed, then you've got an unsigned int == int comparison 14:23 < nlewycky> uint8_t and unsigned char are also promoted to int (not unsigned int) before the addition
If you're gonna go with casting, I think using the same type as m_num_registers makes more sense.
assert(m_num_registers == static_cast<uint32_t>(...));