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

[Shen Liu via llvm-dev]

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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