[LLVMdev] Is it possible to map an LLVM instruction to x86 assembly instructions?

[Jianzhou Zhao]

On Mon, Oct 25, 2010 at 4:54 PM, Eli Friedman <eli.friedman at gmail.com> wrote:
> On Mon, Oct 25, 2010 at 12:39 PM, Heming Cui <hc2428 at columbia.edu> wrote:
>> Dear folks,
>>     If I want to setup a mapping between an LLVM instruction and the x86
>> assembly instructions it generates, is this possible?
>>     Or, an equavalent question is, when LLVM is emitting assebmly
>> instructions, will it transform a set of LLVM instructions to a set of
>> assembly instructions, or transform each LLVM instruction to assembly
>> instructions independently?
>
> Essentially, it's from a set to a set; if you're compiling without
> optimizations, the correlation will likely be close, but not exact.
> With optimizations, the end result might not be particularly close.
> You can come up with an approximation using debug information, though.

Does the pass 'X86DAGToDAGISel' added by
'X86TargetMachine::addInstSelector' define such mappings? although it
maps DAG to X86 code.

>
> -Eli
>
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-- 
Jianzhou