| Issue |
185303
|
| Summary |
[AMDGPU] The llvm.amdgcn.wave.shuffle produced invalid instructions in simulated w64 mode
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
jhuber6
|
Most likely the generic wave shuffle intrinsic is introducing invalid opcodes when w64 mode is turned on with `-mwavefrontsize64` on w32 native targets like gfx1030. Reproducer https://godbolt.org/z/EW18PTnW9
```llvm
define amdgpu_kernel void @kernel() #0 {
entry:
%0 = tail call i32 @llvm.amdgcn.mbcnt.hi(i32 0, i32 0)
%1 = tail call i32 @llvm.amdgcn.wave.shuffle.i32(i32 %0, i32 %0)
store i32 %1, ptr addrspace(1) null, align 4
ret void
}
; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind willreturn memory(none)
declare i32 @llvm.amdgcn.mbcnt.hi(i32, i32) #1
; Function Attrs: convergent nocallback nofree nosync nounwind willreturn memory(none)
declare i32 @llvm.amdgcn.wave.shuffle.i32(i32, i32) #2
attributes #0 = { "target-features"="+wavefrontsize64" }
attributes #1 = { nocallback nocreateundeforpoison nofree nosync nounwind willreturn memory(none) }
attributes #2 = { convergent nocallback nofree nosync nounwind willreturn memory(none) }
```
```console
$ llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1030
llc: /root/llvm-project/llvm/include/llvm/MC/MCInstrInfo.h:91: const llvm::MCInstrDesc& llvm::MCInstrInfo::get(unsigned int) const: Assertion `Opcode < NumOpcodes && "Invalid opcode!"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1030 <source>
1. Running pass 'CallGraph Pass Manager' on module '<source>'.
2. Running pass 'Branch relaxation pass' on function '@kernel'
#0 0x00000000044bccb8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x44bccb8)
#1 0x00000000044b9ae4 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x0000773364842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#3 0x00007733648969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#4 0x0000773364842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#5 0x00007733648287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#6 0x000077336482871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#7 0x0000773364839e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#8 0x000000000102c473 (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x102c473)
#9 0x000000000104ee29 llvm::SIInstrInfo::getInstSizeInBytes(llvm::MachineInstr const&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x104ee29)
#10 0x000000000300b70d (anonymous namespace)::BranchRelaxation::computeBlockSize(llvm::MachineBasicBlock const&) const (.isra.0) BranchRelaxation.cpp:0:0
#11 0x000000000300e3a7 (anonymous namespace)::BranchRelaxation::run(llvm::MachineFunction&) BranchRelaxation.cpp:0:0
#12 0x0000000003010977 (anonymous namespace)::BranchRelaxationLegacy::runOnMachineFunction(llvm::MachineFunction&) BranchRelaxation.cpp:0:0
#13 0x0000000003222289 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
```
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