https://bugs.freedesktop.org/show_bug.cgi?id=84232
--- Comment #2 from Vitaliy Filippov vitalif@yourcmc.ru --- Created attachment 107527 --> https://bugs.freedesktop.org/attachment.cgi?id=107527&action=edit Attempt to reduce testcase using bugpoint
Tried to reduce the case using bugpoint:
PATH=/usr/lib/llvm-3.5/bin/:$PATH bugpoint-3.5 kernel.ll --llc-safe --tool-args -- -march=r600 -mcpu=oland
The result leads to other crash, maybe it's also a bug, but it's definitely another bug:
llc-3.5 -march=r600 -mcpu=oland bugpoint-reduced-simplified.ll
Which leads to a segfault on a non-assert build and to the following message on a release+asserts build:
Unhandled loop condition! UNREACHABLE executed at /var/home/vitali/setup/llvm-toolchain-3.5-3.5/lib/Target/R600/SIAnnotateControlFlow.cpp:259!
This is probably related to bugpoint replacing the branch conditions with constants, which makes conditional branches effectively unconditional :) and SIAnnotateControlFlow::handleLoopCondition also doesn't handle this case.
Looks like an easy to fix problem?