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intel/fs: add variable for output of debug backend optimizer

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It can be useful to compare 2 runs with different compiler changes.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24552>
This commit is contained in:
Lionel Landwerlin 2023-08-07 17:06:49 +03:00 • committed by Marge Bot
parent 0e244d56e3
commit 6f694432e4
2 changed files with 18 additions and 1 deletions
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16
docs/envvars.rst
View file

@ -713,6 +713,22 @@ Intel driver environment variables
if set to 1, true or yes, then the driver prefers accuracy over
performance in trig functions.
.. envvar:: INTEL_SHADER_OPTIMIZER_PATH
if set, determines the directory to be used for overriding shader
assembly. The binaries with custom assembly should be placed in
this folder and have a name formatted as ``sha1_of_assembly.bin``.
The SHA-1 of a shader assembly is printed when assembly is dumped via
corresponding :envvar:`INTEL_DEBUG` flag (e.g. ``vs`` for vertex shader).
A binary could be generated from a dumped assembly by ``i965_asm``.
For :envvar:`INTEL_SHADER_ASM_READ_PATH` to work it is necessary to enable
dumping of corresponding shader stages via :envvar:`INTEL_DEBUG`.
It is advised to use ``nocompact`` flag of :envvar:`INTEL_DEBUG` when
dumping and overriding shader assemblies.
The success of assembly override would be signified by "Successfully
overrode shader with sha1 <SHA-1>" in stderr replacing the original
assembly.
.. envvar:: INTEL_SHADER_ASM_READ_PATH
if set, determines the directory to be used for overriding shader

3
src/intel/compiler/brw_fs.cpp
View file

@ -6200,7 +6200,8 @@ fs_visitor::debug_optimizer(const char *pass_name,
return;
char *filename;
int ret = asprintf(&filename, "%s%d-%s-%02d-%02d-%s",
int ret = asprintf(&filename, "%s/%s%d-%s-%02d-%02d-%s",
debug_get_option("INTEL_SHADER_OPTIMIZER_PATH", "./"),
stage_abbrev, dispatch_width, nir->info.name,
iteration, pass_num, pass_name);
if (ret == -1)