[LLVMdev] Lowering x64bit LLVM IR to x86bit LLVM IR

Sandeep Kumar Singh deepdondo007 at gmail.com
Thu Dec 18 20:28:33 PST 2014

Hi Tim,

I have implemented this engine only for opcodes that are not using memory
(it is only for register to register) and currently I have lowered down
LLVM IR for mov and add opcode, and thus I need to test this code only.

Is there any other way to test the same?


On Thu, Dec 18, 2014 at 9:03 PM, Tim Northover <t.p.northover at gmail.com>
> > This is generated with my are written. Now, I want to test this
> generated,
> > lowered x64bit IR for x86bit machine.
> It looks very different from the 64-bit input, but that's a problem
> for debugging to resolve I suppose.
> > Please let me know how I can test this. How I can test generated LLVM IR,
> > how I can debug this generated LLVM IR.
> If it was me, I'd start with functions with well-defined inputs and
> outputs (e.g. "int foo(int a, int b) { return a + b; }"). Create a
> test-harness that calls out to this function and then replace the
> default implementation with one that comes from your specially
> converted IR. Use that to make sure the values match up.
> You'd likely have difficulties with mismatched calling conventions, so
> it might be better to use global variables for all input/output (so
> "int a, b, res; void foo() { res = a + b; }" instead). They tend to be
> easier to get working.
> Cheers.
> Tim.


Thanks and Regards,
Sandeep Kumar Singh
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