[llvm-dev] zero_reg

[Sky Flyer via llvm-dev]

Hi all,

what is exactly "zero_reg"?

from ARMInstFromats.td:

*def pred : PredicateOperand<OtherVT, (ops i32imm, i32imm), (ops (i32 14),
(i32 zero_reg))> {...}*

I thought zero_reg can be replace by a random name like (alu_stat_reg for
alu state register) but when I compiled it, I figure out that zero_reg is a
predefined variable.

Can someone please give me more information about zero_reg and if possible
more about PredicateOperand operands.

Cheers,
ES
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