search for: constantrc

..., v2 // write the output register 'o1' I planed to partition the register into different RegisterClass: input, output, general purpose, constant, etc. def GeneralPurposeRC : RegisterClass<packed, 128, [R0, R1]>; def InputRC : RegisterClass<packed, 128, [V0, V1]>; def ConstantRC : RegisterClass<packed, 128, [C0, C1]>; def ADDgg : BinaryInst<0x51, ( ops GeneralPurposeRC :$dest, ope GeneralPurposeRC :$src), "add $dest, $src">; def ADDgi : BinaryInst<0x52, ( ops GeneralPurposeRC :$dest, ope InputRC :$src), "add $dest, $src"&g...

On Sat, 23 Jul 2005, Tzu-Chien Chiu wrote: > 2005/7/23, Chris Lattner <sabre at nondot.org>: >> What does a 'read only' register mean? Is it a constant (e.g. returns >> 1.0)? Otherwise, how can it be a useful value? > > Yes, it's a constant register. > > Because the instruction cannot contain an immediate value, a constant > value may be stored in

2005/7/23, Chris Lattner <sabre at nondot.org>: > > What does a 'read only' register mean? Is it a constant (e.g. returns > 1.0)? Otherwise, how can it be a useful value? Yes, it's a constant register. Because the instruction cannot contain an immediate value, a constant value may be stored in a constant register, and it's defined _before_ the program starts by

...order' is to cover. > I planed to partition the register into different RegisterClass: > input, output, general purpose, constant, etc. > > def GeneralPurposeRC : RegisterClass<packed, 128, [R0, R1]>; > def InputRC : RegisterClass<packed, 128, [V0, V1]>; > def ConstantRC : RegisterClass<packed, 128, [C0, C1]>; The way you want to partition these is based on how the instruction set works. If there is a single 'add' instruction that can operate on any of these registers, there should be a single register class. If there are two adds (as it looks l...