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Hello > How can i tell the system X=A*B + C == X = B*A + C == X=C+A*B == X=C+B*A by > property 'isCommutable'? Is it necessary to do that? Most probably you will need to write a special hook to commute this instruction. However, everything depends on your target (e.g. if there is an output register tied to one of the input). > *** Another question: Why set isCommutable = 1 in

...imm operations. > > -- > With best regards, Anton Korobeynikov > Faculty of Mathematics and Mechanics, Saint Petersburg State University > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20091208/3b7fbde6/attachment.html>

Hi everyone, I practice writing target description file with MSP430 reference. I add a multiply-and-add instruction as below: let isTwoAddress=1 in { def MULADD:Pseudo<(out GR16:$dst), (ins GR16:$src1, GR16:$src2, GR16:$src3), "muladd\t{$dst, $src2, $src3}", [(set GR16:$dst, (add GR16:$src1, (mul GR16:$src2,