[llvm] Reapply "[llvm-exegesis] Exclude loads/stores from aliasing instruction set" (#156735) (PR #159366)
David Spickett via llvm-commits
llvm-commits at lists.llvm.org
Mon Oct 6 07:36:41 PDT 2025
DavidSpickett wrote:
The added test is failing on our 2 stage SVE builders, not on single stage for reasons I don't understand. Also it has passed once on one of the builders, so it could be something about our host machines.
https://lab.llvm.org/buildbot/#/builders/41/builds/9394
```
--
# RUN: at line 3
/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-exegesis -mtriple=aarch64 -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=FMOVWSr --benchmark-phase=assemble-measured-code 2>&1
# executed command: /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-exegesis -mtriple=aarch64 -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=FMOVWSr --benchmark-phase=assemble-measured-code
# .---command stdout------------
# | Check generated assembly with: /usr/bin/objdump -d %d
# | ---
# | mode: latency
# | key:
# | instructions:
# | - 'FMOVWSr S22 W27'
# | - 'FCVTNUUWSr W21 S22'
# | config: ''
# | register_initial_values:
# | - 'W27=0x0'
# | - 'FPCR=0x0'
# | cpu_name: neoverse-v2
# | llvm_triple: aarch64
# | min_instructions: 10000
# | measurements: []
# | error: actual measurements skipped.
# | info: Repeating two instructions
# | assembled_snippet: FB57BFA91B008052080080D208441BD57603271ED502211E7603271ED502211E7603271ED502211E7603271ED502211EFB57C1A8C0035FD6
# | ...
# `-----------------------------
# RUN: at line 4
/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-objdump -d %d > /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/test/tools/llvm-exegesis/AArch64/Output/no-aliasing-ld-str.s.tmp.s
# executed command: /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-objdump -d %d
# .---redirected output from '/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/test/tools/llvm-exegesis/AArch64/Output/no-aliasing-ld-str.s.tmp.s'
# |
# | %d: file format elf64-littleaarch64
# |
# | Disassembly of section .text:
# |
# | 0000000000000000 <foo>:
# | 0: a9bf57fb stp x27, x21, [sp, #-0x10]!
# | 4: 5280001b mov w27, #0x0 // =0
# | 8: d2800008 mov x8, #0x0 // =0
# | c: d51b4408 msr FPCR, x8
# | 10: 1e270376 fmov s22, w27
# | 14: 1e2102d5 fcvtnu w21, s22
# | 18: 1e270376 fmov s22, w27
# | 1c: 1e2102d5 fcvtnu w21, s22
# | 20: 1e270376 fmov s22, w27
# | 24: 1e2102d5 fcvtnu w21, s22
# | 28: 1e270376 fmov s22, w27
# | 2c: 1e2102d5 fcvtnu w21, s22
# | 30: 1e270376 fmov s22, w27
# | 34: 1e2102d5 fcvtnu w21, s22
# | 38: 1e270376 fmov s22, w27
# | 3c: 1e2102d5 fcvtnu w21, s22
# | 40: 1e270376 fmov s22, w27
# | 44: 1e2102d5 fcvtnu w21, s22
# | 48: 1e270376 fmov s22, w27
# | 4c: 1e2102d5 fcvtnu w21, s22
# | 50: 1e270376 fmov s22, w27
# | 54: 1e2102d5 fcvtnu w21, s22
# | 58: 1e270376
# | ...
# `---data was truncated--------
# .---command stderr------------
# | 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: /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-objdump -d %d
# | #0 0x0000ac231dbf32c0 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-objdump+0x23632c0)
# | #1 0x0000ac231dbf0ed4 llvm::sys::RunSignalHandlers() (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-objdump+0x2360ed4)
# | #2 0x0000ac231dbf404c SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
# | #3 0x0000ed33f8f27968 (linux-vdso.so.1+0x968)
# | #4 0x0000ac231dac51b8 llvm::object::ELFFile<llvm::object::ELFType<(llvm::endianness)1, true>>::sections() const (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-objdump+0x22351b8)
# | #5 0x0000ac231daff9b0 llvm::object::ELFObjectFile<llvm::object::ELFType<(llvm::endianness)1, true>>::getSectionIndex(llvm::object::DataRefImpl) const (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-objdump+0x226f9b0)
# | #6 0x0000ac231d573ed0 disassembleObject(llvm::object::ObjectFile&, llvm::object::ObjectFile const&, (anonymous namespace)::DisassemblerTarget&, std::optional<(anonymous namespace)::DisassemblerTarget>&, llvm::objdump::SourcePrinter&, bool, llvm::raw_ostream&) llvm-objdump.cpp:0:0
# | #7 0x0000ac231d56b14c dumpObject(llvm::object::ObjectFile*, llvm::object::Archive const*, llvm::object::Archive::Child const*) llvm-objdump.cpp:0:0
# | #8 0x0000ac231d55df0c llvm_objdump_main(int, char**, llvm::ToolContext const&) (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-objdump+0x1ccdf0c)
# | #9 0x0000ac231d604578 main (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-objdump+0x1d74578)
# | #10 0x0000ed33f8a373fc __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
# | #11 0x0000ed33f8a374cc call_init ./csu/../csu/libc-start.c:128:20
# | #12 0x0000ed33f8a374cc __libc_start_main ./csu/../csu/libc-start.c:379:5
# | #13 0x0000ac231d554b70 _start (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/bin/llvm-objdump+0x1cc4b70)
# `-----------------------------
# error: command failed with exit status: -7
```
Seems like it's llvm-objdump crashing so it could be a disassembly issue we've not hit before. I won't have time to reproduce it until tomorrow.
Let me know if anything in there stands out or there's any reason having SVE or SVE2 on the machine would be a problem. For instance, is this expected?
```
# | error: actual measurements skipped.
```
https://github.com/llvm/llvm-project/pull/159366
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