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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Large ExtInt cannot convert to/from floating point (DAG, SINT_TO_FP)"
href="https://bugs.llvm.org/show_bug.cgi?id=48302">48302</a>
</td>
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<th>Summary</th>
<td>Large ExtInt cannot convert to/from floating point (DAG, SINT_TO_FP)
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<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>C
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>m.gehre@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>(see <a href="https://godbolt.org/z/hszG4W">https://godbolt.org/z/hszG4W</a>)
int main() {
_ExtInt(129) c = 3;
double d = c;
return 0;
}
causes
Fatal error: error in backend: Unsupported library call operation!
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-trunk/bin/clang -g -o
./output.s -mllvm --x86-asm-syntax=intel -S
--gcc-toolchain=/opt/compiler-explorer/gcc-9.2.0 -fcolor-diagnostics
-fno-crash-diagnostics <source>
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module '<source>'.
4. Running pass 'X86 DAG->DAG Instruction Selection' on function '@main'
#0 0x0000555cba07efcc llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(/opt/compiler-explorer/clang-trunk/bin/clang+0x2e0bfcc)
#1 0x0000555cba07cd64 llvm::sys::RunSignalHandlers()
(/opt/compiler-explorer/clang-trunk/bin/clang+0x2e09d64)
#2 0x0000555cba07cff5 llvm::sys::CleanupOnSignal(unsigned long)
(/opt/compiler-explorer/clang-trunk/bin/clang+0x2e09ff5)
#3 0x0000555cb9febac2 llvm::CrashRecoveryContext::HandleExit(int)
(/opt/compiler-explorer/clang-trunk/bin/clang+0x2d78ac2)
#4 0x0000555cba075c1e llvm::sys::Process::Exit(int, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+0x2e02c1e)
#5 0x0000555cb817be0e LLVMErrorHandler(void*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+0xf08e0e)
#6 0x0000555cb9ff2329 llvm::report_fatal_error(llvm::Twine const&, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+0x2d7f329)
#7 0x0000555cb9ff2478 (/opt/compiler-explorer/clang-trunk/bin/clang+0x2d7f478)
#8 0x0000555cbadcc0a8 llvm::TargetLowering::makeLibCall(llvm::SelectionDAG&,
llvm::RTLIB::Libcall, llvm::EVT, llvm::ArrayRef<llvm::SDValue>,
llvm::TargetLowering::MakeLibCallOptions, llvm::SDLoc const&, llvm::SDValue)
const (/opt/compiler-explorer/clang-trunk/bin/clang+0x3b590a8)
#9 0x0000555cbae6066f
llvm::DAGTypeLegalizer::ExpandIntOp_SINT_TO_FP(llvm::SDNode*)
(/opt/compiler-explorer/clang-trunk/bin/clang+0x3bed66f)
I wonder if this should be solved in LLVM or if clang should forbid those
conversions.</pre>
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