This appears to be a crash in a loop unrolling optimization pass
(enabled only when -cl-fast-relaxed-math is set, hence only crashing then).
Disabling this pass unconditionally (see attached) avoids the crash, but
may reduce performance.
Description: Disable loop unrolling, as it may crash
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=913141
--- beignet-1.3.2.orig/backend/src/llvm/llvm_to_gen.cpp
+++ beignet-1.3.2/backend/src/llvm/llvm_to_gen.cpp
@@ -182,25 +182,6 @@ namespace gbe
#endif
MPM.add(createGVNPass()); // Remove redundancies
}
-#if LLVM_VERSION_MAJOR * 10 + LLVM_VERSION_MINOR >= 35
- // FIXME Workaround: we find that CustomLoopUnroll may increase register pressure greatly,
- // and it may even make som cl kernel cannot compile because of limited scratch memory for spill.
- // As we observe this under strict math. So we disable CustomLoopUnroll if strict math is enabled.
- if (!strictMath) {
-#if !defined(__ANDROID__)
- MPM.add(createCustomLoopUnrollPass()); //1024, 32, 1024, 512)); //Unroll loops
-#endif
- MPM.add(createLoopUnrollPass()); //1024, 32, 1024, 512)); //Unroll loops
- if(optLevel > 0) {
-#if LLVM_VERSION_MAJOR * 10 + LLVM_VERSION_MINOR >= 38
- MPM.add(createSROAPass());
-#else
- MPM.add(createSROAPass(/*RequiresDomTree*/ false));
-#endif
- MPM.add(createGVNPass()); // Remove redundancies
- }
- }
-#endif
MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset
MPM.add(createSCCPPass()); // Constant prop with SCCP
