llvm/include/llvm/Support/Casting.h:109: Assertion failed #93029
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dcb314
added
crash-on-valid
needs-reduction
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@llvm/issue-subscribers-c Author: None (dcb314)
Clang can be made to say:
clang: /home/dcb38/llvm/trunk/llvm/include/llvm/Support/Casting.h:109: static bool llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To = llvm::UndefValue; From = llvm::Constant]: Assertion `Val && "isa<> used on a null pointer"' failed. codegen_timing_486-53904b.sh.gz |
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Can't reproduce on trunk and 18.1.0 with assertions: https://godbolt.org/z/8Wxvqcz4o |
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The version of the compiler I used was from this morning. Stack backtrace is Machine type is x86_64. AMD Zen 3 I think. When the reduction is finished, I will post it here. |
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Thank you for reducing it yourself! Please make sure you follow this guidance, in order for your reduction to be as useful as possible: #89807 (comment) |
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It works fine with yesterday's clang: llvm $ ~/llvm/results.20240521/bin/clang -c -w -O1 codegen_timing_486-53904b.c
llvm $ But not todays ;-| llvm $ ~/llvm/results.20240522/bin/clang -c -w -O1 codegen_timing_486-53904b.c
lang: /home/dcb38/llvm/trunk/llvm/include/llvm/Support/Casting.h:109: static bo
ol llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To = llvm::UndefV
alue; From = llvm::Constant]: Assertion `Val && "isa<> used on a null pointer"'
failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and i
nclude the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /home/dcb38/llvm/results.20240522/bin/clang -c -w -O1
codegen_timing_486-53904b.c
1. <eof> parser at end of file
2. Optimizer
#0 0x0000000001fa377e llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home
/dcb38/llvm/trunk/llvm/lib/Support/Unix/Signals.inc:723:22
#1 0x0000000001fa08eb llvm::sys::RunSignalHandlers() /home/dcb38/llvm/trunk/llv
m/lib/Support/Signals.cpp:105:20
#2 0x0000000001eed398 HandleCrash /home/dcb38/llvm/trunk/llvm/lib/Support/Crash
RecoveryContext.cpp:73:5
#3 0x0000000001eed398 CrashRecoverySignalHandler(int) /home/dcb38/llvm/trunk/ll
vm/lib/Support/CrashRecoveryContext.cpp:390:62
#4 0x00007fbec565fbb0 __restore_rt (/lib64/libc.so.6+0x3dbb0)
#5 0x00007fbec56b0884 __pthread_kill_implementation (/lib64/libc.so.6+0x8e884)
#6 0x00007fbec565fafe gsignal (/lib64/libc.so.6+0x3dafe)
#7 0x00007fbec564887f abort (/lib64/libc.so.6+0x2687f)
#8 0x00007fbec564879b _nl_load_domain.cold (/lib64/libc.so.6+0x2679b)
#9 0x00007fbec5658187 (/lib64/libc.so.6+0x36187)
#10 0x0000000001b7cfe4 llvm::InstCombinerImpl::foldCmpLoadFromIndexedGlobal(llvm
::LoadInst*, llvm::GetElementPtrInst*, llvm::GlobalVariable*, llvm::CmpInst&, llYesterday's compiler has git hash 6246b49 That looks like 142 commits, so that should be easy (for someone who knows |
dtcxzyw
removed
the
needs-reduction
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Reproducer: https://godbolt.org/z/c1oT7cncd LLVM version: cf12830 |
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Final reduced C code seems to be: int timing_int;
static int *opcode_timings[] = {&timing_int, 0};
char codegen_timing_486_prefix_prefix;
void codegen_timing_486_prefix() {
if ((long)opcode_timings[codegen_timing_486_prefix_prefix] & ~0xffff)
*(int *)0;
} |
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Fixed by 0748a98 |
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Clang can be made to say:
clang: /home/dcb38/llvm/trunk/llvm/include/llvm/Support/Casting.h:109: static bool llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To = llvm::UndefValue; From = llvm::Constant]: Assertion `Val && "isa<> used on a null pointer"' failed.
codegen_timing_486-53904b.sh.gz
codegen_timing_486-53904b.c.gz
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