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i965/fs: Debug the optimization passes by dumping instr to file. 

With INTEL_DEBUG=optimizer, write the output of dump_instructions() to a
file each time an optimization pass makes progress. This lets you easily
diff successive files to see what an optimization pass did.

Example filenames written when running glxgears:
   fs8-0000-00-start
   fs8-0000-01-04-opt_copy_propagate
   fs8-0000-01-06-dead_code_eliminate
   fs8-0000-01-12-compute_to_mrf
   fs8-0000-02-06-dead_code_eliminate
        |   |  |   |
        |   |  |   `-- optimization pass name
        |   |  |
        |   |  `-- optimization pass number in the loop
        |   |
        |   `-- optimization loop interation
        |
        `-- shader program number

Note that with INTEL_DEBUG=optimizer, we disable compact_virtual_grfs,
so that we can diff instruction lists across loop interations without
the register numbers being changes.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2014-04-07 10:25:50 -07:00
parent e9bf1662b0
commit 55bd8b8b66
1 changed files with 40 additions and 11 deletions
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51
src/mesa/drivers/dri/i965/brw_fs.cpp
View File

@ -1714,6 +1714,9 @@ fs_visitor::split_virtual_grfs()
void
fs_visitor::compact_virtual_grfs()
{
if (unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER))
return;
/* Mark which virtual GRFs are used, and count how many. */
int remap_table[this->virtual_grf_count];
memset(remap_table, -1, sizeof(remap_table));
@ -3020,24 +3023,50 @@ fs_visitor::run()
opt_drop_redundant_mov_to_flags();
#define OPT(pass, args...) do { \
pass_num++; \
bool this_progress = pass(args); \
\
if (unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER) && this_progress) { \
char filename[64]; \
snprintf(filename, 64, "fs%d-%04d-%02d-%02d-" #pass, \
dispatch_width, shader_prog->Name, iteration, pass_num); \
\
backend_visitor::dump_instructions(filename); \
} \
\
progress = progress || this_progress; \
} while (false)
if (unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER)) {
char filename[64];
snprintf(filename, 64, "fs%d-%04d-00-start",
dispatch_width, shader_prog->Name);
backend_visitor::dump_instructions(filename);
}
bool progress;
int iteration = 0;
do {
progress = false;
iteration++;
int pass_num = 0;
compact_virtual_grfs();
progress = remove_duplicate_mrf_writes() || progress;
OPT(remove_duplicate_mrf_writes);
progress = opt_algebraic() || progress;
progress = opt_cse() || progress;
progress = opt_copy_propagate() || progress;
progress = opt_peephole_predicated_break() || progress;
progress = dead_code_eliminate() || progress;
progress = opt_peephole_sel() || progress;
progress = dead_control_flow_eliminate(this) || progress;
progress = opt_saturate_propagation() || progress;
progress = register_coalesce() || progress;
progress = compute_to_mrf() || progress;
OPT(opt_algebraic);
OPT(opt_cse);
OPT(opt_copy_propagate);
OPT(opt_peephole_predicated_break);
OPT(dead_code_eliminate);
OPT(opt_peephole_sel);
OPT(dead_control_flow_eliminate, this);
OPT(opt_saturate_propagation);
OPT(register_coalesce);
OPT(compute_to_mrf);
} while (progress);
lower_uniform_pull_constant_loads();