[llvm-dev] How to get the value for casting in a bitcast instruction more efficiently?

[Ryan Taylor via llvm-dev]

This might help:

http://llvm.org/docs/ProgrammersManual.html#the-value-class

Or maybe I'm misunderstanding what you mean by "efficient way to get the
value". When you say 'value', I'm assuming you mean the class. In your
case, AllocaInst inherits from value.

-Ryan

On Thu, Dec 15, 2016 at 10:24 AM, Shen Liu via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi everyone,
>
> This is a simple question but is there an efficient way to get the *value for casting* directly from a bitcast instruction?
>
> bitcast format :<result> = bitcast <ty> <*value*> to <ty2>
>
> For example, if i have
>
> MemAddr
> ...
> 0x3d61238   %key = alloca [16 x i8], align 16
> 0x3d612a8   %plain_text = alloca [64 x i8], align 16
> 0x3d61318   %key1 = bitcast [16 x i8]* %key to i8*
> ...
>
> The way i am using is processing all opcodes in %key1, and go back to find %key along the def-use chain. But is there a better way for doing this?
>
> Thanks very much!
>
> Best
>
>
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