Closed
Description
This reduced test case from llvm-test-suite/External/ffmpeg's checkasm_check_v210enc() asserts when compiling at O2:
target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
target triple = "hexagon-unknown-linux-musl"
define void @checkasm_check_v210enc(i32 %.pre) {
entry:
br label %for.body147
for.body147: ; preds = %for.body170, %entry
%add11.i526 = or i32 %.pre, 1
br label %for.body158
for.body158: ; preds = %for.body158, %for.body147
%i154.0604 = phi i32 [ 0, %for.body147 ], [ %add166.3, %for.body158 ]
%add11.i536602603 = phi i32 [ %add11.i526, %for.body147 ], [ 0, %for.body158 ]
%and8.i534 = and i32 %add11.i536602603, 1
%arrayidx9.i535 = getelementptr [64 x i32], ptr null, i32 0, i32 %and8.i534
store i32 0, ptr %arrayidx9.i535, align 4
%add166.3 = add i32 %i154.0604, 1
%cmp157.3 = icmp ult i32 %i154.0604, 510
br i1 %cmp157.3, label %for.body158, label %for.body170
for.body170: ; preds = %for.body170, %for.body158
%i154.1608 = phi i32 [ %add182.1, %for.body170 ], [ 0, %for.body158 ]
%add11.i556606607 = phi i32 [ 0, %for.body170 ], [ 1, %for.body158 ]
%add.ptr179 = getelementptr i16, ptr null, i32 %i154.1608
store i32 0, ptr %add.ptr179, align 8
%add182 = or disjoint i32 %i154.1608, 2
%sub.i547.1 = add i32 %add11.i556606607, 1
%and.i548.1 = and i32 %sub.i547.1, 1
%arrayidx.i549.1 = getelementptr [64 x i32], ptr null, i32 0, i32 %and.i548.1
%0 = load i32, ptr %arrayidx.i549.1, align 4
%add.ptr178.1 = getelementptr i16, ptr null, i32 %add182
store i32 %0, ptr %add.ptr178.1, align 4
%add182.1 = add i32 %i154.1608, 1
%cmp169.1 = icmp ult i32 %i154.1608, 254
br i1 %cmp169.1, label %for.body170, label %for.body147
}
./bin/llc -O2 --mtriple=hexagon ../toolchain_for_hexagon/reduced_v210enc.ll
ninja: no work to do.
llc: /local/mnt/workspace/upstream/llvm-project/llvm/lib/CodeGen/MachineScheduler.cpp:1406: void llvm::ScheduleDAGMILive::updatePressureDiffs(ArrayRef<RegisterMaskPair>): Assertion `VNI && "No live value at use."' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. Program arguments: ./bin/llc -O2 --mtriple=hexagon ../toolchain_for_hexagon/reduced_v210enc.ll
1. Running pass 'Function Pass Manager' on module '../toolchain_for_hexagon/reduced_v210enc.ll'.
2. Running pass 'Modulo Software Pipelining' on function '@checkasm_check_v210enc'
#0 0x000055e40be39ff8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (./bin/llc+0x3fbeff8)
#1 0x000055e40be37a30 llvm::sys::RunSignalHandlers() (./bin/llc+0x3fbca30)
#2 0x000055e40be3a71a SignalHandler(int) Signals.cpp:0:0
#3 0x00007f14d8a66520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007f14d8aba9fc __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#5 0x00007f14d8aba9fc __pthread_kill_internal ./nptl/pthread_kill.c:78:10
#6 0x00007f14d8aba9fc pthread_kill ./nptl/pthread_kill.c:89:10
#7 0x00007f14d8a66476 gsignal ./signal/../sysdeps/posix/raise.c:27:6
#8 0x00007f14d8a4c7f3 abort ./stdlib/abort.c:81:7
#9 0x00007f14d8a4c71b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#10 0x00007f14d8a5de96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#11 0x000055e40afc3333 llvm::ScheduleDAGMILive::updatePressureDiffs(llvm::ArrayRef<llvm::RegisterMaskPair>) (./bin/llc+0x3148333)
#12 0x000055e40afc4958 llvm::ScheduleDAGMILive::scheduleMI(llvm::SUnit*, bool) (./bin/llc+0x3149958)
#13 0x000055e40b255e97 llvm::VLIWMachineScheduler::schedule() (./bin/llc+0x33dae97)
#14 0x000055e40b261c64 llvm::WindowScheduler::run() (./bin/llc+0x33e6c64)
#15 0x000055e40af5d901 llvm::MachinePipeliner::runWindowScheduler(llvm::MachineLoop&) (./bin/llc+0x30e2901)
#16 0x000055e40af5b896 llvm::MachinePipeliner::scheduleLoop(llvm::MachineLoop&) (./bin/llc+0x30e0896)
#17 0x000055e40af5b7eb llvm::MachinePipeliner::scheduleLoop(llvm::MachineLoop&) (./bin/llc+0x30e07eb)
#18 0x000055e40af5b70b llvm::MachinePipeliner::runOnMachineFunction(llvm::MachineFunction&) (./bin/llc+0x30e070b)
#19 0x000055e40aeeb999 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (./bin/llc+0x3070999)
#20 0x000055e40b44bfd9 llvm::FPPassManager::runOnFunction(llvm::Function&) (./bin/llc+0x35d0fd9)
#21 0x000055e40b454632 llvm::FPPassManager::runOnModule(llvm::Module&) (./bin/llc+0x35d9632)
#22 0x000055e40b44cc34 llvm::legacy::PassManagerImpl::run(llvm::Module&) (./bin/llc+0x35d1c34)
#23 0x000055e40a047d27 main (./bin/llc+0x21ccd27)
#24 0x00007f14d8a4dd90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#25 0x00007f14d8a4de40 call_init ./csu/../csu/libc-start.c:128:20
#26 0x00007f14d8a4de40 __libc_start_main ./csu/../csu/libc-start.c:379:5
#27 0x000055e40a041d25 _start (./bin/llc+0x21c6d25)
Aborted (core dumped)
I have bisected this failure to b6bf402
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