Am 13.02.2013 01:39, schrieb Tom Stellard:
[SNIP]
Way back when I first started working on the backend I was using
immediate operands in instructions defined to only uses registers, and
it worked most of the time, but I ran into a few cases where some of the
passes weren't able to handle it. So, I'm actually kind of surprised that this
works, but it's a nice simplification in any case.
I stumbled over a couple of problems while coding it, but they were not
related to the fact that I tried to put immediate values into operands
that should only have registers. It was more that it surfaced a couple
of other problems, for example we shouldn't use f64 as supported type in
a RegisterClass and then forget to set a default class for f64 with
"addRegisterClass", that can lead to a whole bunch of problems,
including segfaults.
Actually when you look into the MCOperandInfo class the only difference
between an immediate operand and an register operand is that registers
have a RegClass. Apart from that this information is only available at
pattern matching time, and there it doesn't seems to matter.
Christian.
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