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:
fs8-00-00-start
fs8-00-01-04-opt_copy_propagate
fs8-00-01-06-dead_code_eliminate
fs8-00-01-12-compute_to_mrf
fs8-00-02-06-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.
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 56 +++++++++++++++++++++++++++---------
1 file changed, 43 insertions(+), 13 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index c1d79e1..666cfa5b 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1704,6 +1704,9 @@ 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));
@@ -3258,25 +3261,52 @@ fs_visitor::run()
opt_drop_redundant_mov_to_flags();
+#define OPT(pass, args...) \
+ ({ \
+ pass_num++; \
+ bool progress = pass(args); \
+ \
+ if (unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER) && progress) { \
+ char filename[64]; \
+ snprintf(filename, 64, "fs%d-%02d-%02d-%02d-" #pass, \
+ dispatch_width, shader_prog->Name, iteration, pass_num); \
+ \
+ backend_visitor::dump_instructions(filename);
\
+ } \
+ \
+ progress; \
+ })
+
+ if (unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER)) {
+ char filename[64];
+ snprintf(filename, 64, "fs%d-%02d-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;
-
- 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 = dead_code_eliminate_local() || 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;
+ progress = OPT(remove_duplicate_mrf_writes) || progress;
+
+ progress = OPT(opt_algebraic) || progress;
+ progress = OPT(opt_cse) || progress;
+ progress = OPT(opt_copy_propagate) || progress;
+ progress = OPT(opt_peephole_predicated_break) || progress;
+ progress = OPT(dead_code_eliminate) || progress;
+ progress = OPT(dead_code_eliminate_local) || progress;
+ progress = OPT(opt_peephole_sel) || progress;
+ progress = OPT(dead_control_flow_eliminate, this) || progress;
+ progress = OPT(opt_saturate_propagation) || progress;
+ progress = OPT(register_coalesce) || progress;
+ progress = OPT(compute_to_mrf) || progress;
} while (progress);
lower_uniform_pull_constant_loads();
--
1.8.3.2
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