[LLVMdev] [PATCH] R600/SI: Embed disassembly in ELF object

[Jay Cornwall]

Hi,

This patch adds R600/SI disassembly text to compiled object files, when 
a code dump is requested, to assist debugging in Mesa clients.

Here's an example of the output in a Mesa client with a corresponding 
patch and RADEON_DUMP_SHADERS set:

Shader Disassembly:

   S_WQM_B64 EXEC, EXEC                           ; BEFE0A7E
   S_MOV_B32 M0, SGPR6                            ; BEFC0306
   V_INTERP_MOV_F32 VGPR0, P0, 3, 0, [M0]         ; C8020302
   V_INTERP_MOV_F32 VGPR1, P0, 2, 0, [M0]         ; C8060202
   V_INTERP_MOV_F32 VGPR2, P0, 1, 0, [M0]         ; C80A0102
   V_INTERP_MOV_F32 VGPR3, P0, 0, 0, [M0]         ; C80E0002
   EXP 15, 0, 0, 1, 1, VGPR3, VGPR2, VGPR1, VGPR0 ; F800180F 00010203
   S_ENDPGM                                       ; BF810000

A less verbose disassembler is included in Mesa for pre-SI clients, so 
the patch does not embed disassembly for NI or earlier targets.

Disassembling during compilation is preferred, as it avoids the overhead 
of a second LLVM invocation. Further, the SILowerControlFlow pass 
modifies the input LLVM IR, which makes a second invocation for 
disassembly fail.

An example patch to Mesa to test functionality is available here: 
https://gist.github.com/anonymous/6911363

-- 
Jay Cornwall
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