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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BYT, HSW, SKL, BXT, KBL] GPU hangs with GfxBench 4.0 CarChase"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96743#c21">Comment # 21</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BYT, HSW, SKL, BXT, KBL] GPU hangs with GfxBench 4.0 CarChase"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96743">bug 96743</a>
from <span class="vcard"><a class="email" href="mailto:topi.pohjolainen@intel.com" title="Topi Pohjolainen <topi.pohjolainen@intel.com>"> <span class="fn">Topi Pohjolainen</span></a>
</span></b>
<pre>Okay, disabling these two optimizations gives the gpu hangs on HSW even on top
of current upstream:
diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
index f863085..5d83ce3 100644
--- a/src/intel/compiler/brw_nir.c
+++ b/src/intel/compiler/brw_nir.c
@@ -470,7 +470,6 @@ nir_optimize(nir_shader *nir, const struct brw_compiler
*compiler,
do {
progress = false;
OPT_V(nir_lower_vars_to_ssa);
- OPT(nir_opt_copy_prop_vars);
if (is_scalar) {
OPT(nir_lower_alu_to_scalar);
@@ -498,9 +497,6 @@ nir_optimize(nir_shader *nir, const struct brw_compiler
*compiler,
OPT(nir_opt_dce);
}
OPT(nir_opt_if);
- if (nir->options->max_unroll_iterations != 0) {
- OPT(nir_opt_loop_unroll, indirect_mask);
- }
OPT(nir_opt_remove_phis);
OPT(nir_opt_undef);
OPT_V(nir_lower_doubles, nir_lower_drcp |</pre>
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