[Mesa-dev] llvmPipe on ARM (CortexA-9)

[Jose Fonseca]

----- Original Message -----
> Hello,
> Can we use llvmpipe for arm architecture.(Specifically ARM cortexA-9)
> ??

It has never been tried before, so have no idea how close it is of working.

> I tried & found below error.
> 
> Unhandled instruction encoding format!
> UNREACHABLE executed at ARMCodeEmitter.cpp:534!
> Aborted
> 
> Version used : llvmpipe3.0,Mesa-8.0
> 
> Any hint or info will be helpfull.

You should run inside a debugger and see the stack trace when LLVM aborts.

You can also see the LLVM IR by setting the following env var:

  GALLIVM_DEBUG=ir

Or dump it to a file by applying this change:

diff --git a/src/gallium/drivers/llvmpipe/lp_state_fs.c b/src/gallium/drivers/llvmpipe/lp_state_fs.c
index ff78b9d..ab37950 100644
--- a/src/gallium/drivers/llvmpipe/lp_state_fs.c
+++ b/src/gallium/drivers/llvmpipe/lp_state_fs.c
@@ -812,7 +812,7 @@ generate_fragment(struct llvmpipe_context *lp,
    }
 
    /* Dump byte code to a file */
-   if (0) {
+   if (1) {
       LLVMWriteBitcodeToFile(gallivm->module, "llvmpipe.bc");
    }
 


Jose