[llvm-dev] How to debug Before Expand ISel Pseudo-instructions ?

Eli Friedman via llvm-dev llvm-dev at lists.llvm.org
Wed Jan 9 15:39:41 PST 2019

On 1/9/2019 3:23 PM, m m via llvm-dev wrote:
> Hi,
> I'm new to LLVM and I ran llc with -print-before-all and I can see 
> that the IR is already wrong before Expand ISel Pseudo-instructions. 
> The MOVE instruction moves a register to itself and shouldn't be 
> there. How do you debug something like this?

"-debug" dumps a lot of additional information.   More specifically, 
"-debug-only=isel" probably has the information you're looking for.


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