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On Oct 25, 2010, at 2:13 AM, Xinfinity wrote: > > Hello, > > Does there exist something like a "dummy" instruction that is not removed by > the optimizers, even if it seems to be dead code? > I want to use such instructions to carry metadata information, but they > should have a minimal impact on the code generation and optimization. Use of metadata will not

...IR. I know that metadata will not prevent the elimination, but I am asking if there is any way to prevent this, or what kind of instructions I could use to have a minimal influence on the optimizers. Alexandra -- View this message in context: http://old.nabble.com/Prevent-instruction-elimination-tp30046067p30049711.html Sent from the LLVM - Dev mailing list archive at Nabble.com.

Hello, Does there exist something like a "dummy" instruction that is not removed by the optimizers, even if it seems to be dead code? I want to use such instructions to carry metadata information, but they should have a minimal impact on the code generation and optimization. I used an add instruction: %0 = add i8 1, 2, !pragma_instrument_mem_add !0 ; <i8> [#uses=0] which