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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - RegP Delta Mismatch, UNREACHABLE executed at ../lib/CodeGen/RegisterPressure.cpp:1124!"
href="https://bugs.llvm.org/show_bug.cgi?id=39429">39429</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>RegP Delta Mismatch, UNREACHABLE executed at ../lib/CodeGen/RegisterPressure.cpp:1124!
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>karl-johan.karlsson@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21035" name="attach_21035" title="llc -verify-misched -O1 -filetype=obj -mtriple x86_64-unknown-linux-gnu -mcpu=x86-64 regpressure.ll">attachment 21035</a> <a href="attachment.cgi?id=21035&action=edit" title="llc -verify-misched -O1 -filetype=obj -mtriple x86_64-unknown-linux-gnu -mcpu=x86-64 regpressure.ll">[details]</a></span>
llc -verify-misched -O1 -filetype=obj -mtriple x86_64-unknown-linux-gnu
-mcpu=x86-64 regpressure.ll
The alternate algorithm for getMaxUpwardPressureDelta() do not yields the same
result.
$ ./llc -verify-misched -O1 -filetype=obj -mtriple x86_64-unknown-linux-gnu
-mcpu=x86-64 regpressure.ll
PDiff: GR32_BSI -1 GR8_ABCD_L+GR32_BSI -1 GR8_NOREX -1 GR32_TC -1
GR32_BPSP+GR32_TC -1 GR64_NOREX -1 GR64_TCW64 -1 GR32_BPSP+GR64_TCW64
-1 GR8 -1 GR8+GR32_DIBP -1 GR8+GR32_BSI -1 GR64_TC+GR64_TCW64 -1
GR8+LOW32_ADDR_ACCESS_with_sub_32bit -1 GR8+GR64_NOREX -1 GR64_TC -1
GR8+GR64_TCW64 -1
DELTA: $cl = COPY %4.sub_8bit:gr32
CurrMx1 GR16 1
RegP Delta Mismatch
UNREACHABLE executed at ../lib/CodeGen/RegisterPressure.cpp:1124!
Stack dump:
0. Program arguments: ./llc -verify-misched -O1 -filetype=obj -mtriple
x86_64-unknown-linux-gnu -mcpu=x86-64 regpressure.ll
1. Running pass 'Function Pass Manager' on module 'regpressure.ll'.
2. Running pass 'Machine Instruction Scheduler' on function '@test'
#0 0x000000000212be34 PrintStackTraceSignalHandler(void*) (./llc+0x212be34)
#1 0x0000000002129f90 llvm::sys::RunSignalHandlers() (./llc+0x2129f90)
#2 0x000000000212c198 SignalHandler(int) (./llc+0x212c198)
#3 0x00007f684a74c330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007f684933bc37 gsignal
/build/eglibc-ripdx6/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f684933f028 abort
/build/eglibc-ripdx6/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00000000020dcf7d llvm::llvm_unreachable_internal(char const*, char const*,
unsigned int) (./llc+0x20dcf7d)
#7 0x0000000001927256 (./llc+0x1927256)
#8 0x000000000189c9f4
llvm::GenericScheduler::initCandidate(llvm::GenericSchedulerBase::SchedCandidate&,
llvm::SUnit*, bool, llvm::RegPressureTracker const&, llvm::RegPressureTracker&)
(./llc+0x189c9f4)
#9 0x000000000189d062
llvm::GenericScheduler::pickNodeFromQueue(llvm::SchedBoundary&,
llvm::GenericSchedulerBase::CandPolicy const&, llvm::RegPressureTracker const&,
llvm::GenericSchedulerBase::SchedCandidate&) (./llc+0x189d062)
#10 0x000000000189dbb1 llvm::GenericScheduler::pickNode(bool&)
(./llc+0x189dbb1)
#11 0x00000000018962f2 llvm::ScheduleDAGMILive::schedule() (./llc+0x18962f2)
#12 0x00000000018a67a4 (anonymous
namespace)::MachineSchedulerBase::scheduleRegions(llvm::ScheduleDAGInstrs&,
bool) (./llc+0x18a67a4)
#13 0x00000000018a6eb8 (anonymous
namespace)::MachineScheduler::runOnMachineFunction(llvm::MachineFunction&)
(./llc+0x18a6eb8)
#14 0x00000000018139dd
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (./llc+0x18139dd)
#15 0x0000000001b49b0d llvm::FPPassManager::runOnFunction(llvm::Function&)
(./llc+0x1b49b0d)
#16 0x0000000001b49dc8 llvm::FPPassManager::runOnModule(llvm::Module&)
(./llc+0x1b49dc8)
#17 0x0000000001b4a22a llvm::legacy::PassManagerImpl::run(llvm::Module&)
(./llc+0x1b4a22a)
#18 0x00000000007279de compileModule(char**, llvm::LLVMContext&)
(./llc+0x7279de)
#19 0x00000000007251c0 main (./llc+0x7251c0)
#20 0x00007f6849326f45 __libc_start_main
/build/eglibc-ripdx6/eglibc-2.19/csu/libc-start.c:321:0
#21 0x000000000072324a _start (./llc+0x72324a)
Aborted (core dumped)</pre>
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