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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - x86_64 f128, UNREACHABLE executed at LegalizeFloatTypes.cpp:687" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24109&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=PM934QObeXxlbdJ0zFPPU2vB1UqDJaLFxJXrN_8MSvw&s=m12DKFfu64nLKgjD91xIdzN6mwZOI5RNQVIzJs2PeVk&e=">24109</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>x86_64 f128, UNREACHABLE executed at LegalizeFloatTypes.cpp:687
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chh@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Input test program:
$ cat /tmp/debug/b.c
union IEEEl2bits {
long double e;
struct {
unsigned long manl :64;
unsigned long manh :48;
unsigned int exp :15;
unsigned int sign :1;
} bits;
};
double copysign(double, double) __attribute__((__const__));
static const long double huge = 0x1p16000L;
long double Testscalbnl(long double x, int n)
{
union IEEEl2bits u;
int k;
u.e = x;
k = u.bits.exp;
if (n > 50000)
return copysign(huge, x);
// implicit convert from long double to double for the call to copysign.
u.bits.exp = k;
return u.e;
}
Compilation command and error:
$ /disk5/chh/LLVM/llvm.0713/Release+Asserts/bin/clang -target
x86_64-linux-android -c -O /tmp/debug/b.c
SoftenFloatOperand Op #1: 0x65e8be0: f64 = fcopysign 0x65e7950, 0x65e8390
[ORD=3] [ID=0]
Do not know how to soften this operator's operand!
UNREACHABLE executed at LegalizeFloatTypes.cpp:687!
0 clang 0x0000000002beb5b8
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 56
1 clang 0x0000000002bea6e9
2 libpthread.so.0 0x00007f41af35b340
3 libc.so.6 0x00007f41ae36fcc9 gsignal + 57
4 libc.so.6 0x00007f41ae3730d8 abort + 328
5 clang 0x0000000002bd080c
6 clang 0x00000000022f1f56
7 clang 0x000000000229e7dc
8 clang 0x000000000229ed1a llvm::SelectionDAG::LegalizeTypes() + 570
9 clang 0x000000000227041a
llvm::SelectionDAGISel::CodeGenAndEmitDAG() + 506
10 clang 0x00000000022743f6
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) + 1238
11 clang 0x0000000002276309
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) + 1129
12 clang 0x0000000002083d44
13 clang 0x0000000002b680e8
llvm::FPPassManager::runOnFunction(llvm::Function&) + 632
14 clang 0x0000000002b6850b
llvm::FPPassManager::runOnModule(llvm::Module&) + 43
15 clang 0x0000000002b68814
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 740
16 clang 0x0000000000b3f524
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_pwrite_stream*)
+ 2420
17 clang 0x0000000000b2ba36
18 clang 0x0000000000d225f3 clang::ParseAST(clang::Sema&, bool, bool)
+ 483
19 clang 0x0000000000b2c70e clang::CodeGenAction::ExecuteAction() +
78
20 clang 0x000000000096ae9e clang::FrontendAction::Execute() + 302
21 clang 0x0000000000946d59
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 345
22 clang 0x000000000092e71e
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2014
23 clang 0x00000000009263a8 cc1_main(llvm::ArrayRef<char const*>,
char const*, void*) + 1544
24 clang 0x00000000008eb3c2 main + 4786
25 libc.so.6 0x00007f41ae35aec5 __libc_start_main + 245
26 clang 0x0000000000924f1f
Stack dump:
0. Program arguments: /disk5/chh/LLVM/llvm.0713/Release+Asserts/bin/clang
-cc1 -triple x86_64--linux-android -emit-obj -disable-free -main-file-name b.c
-mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno
-masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array
-target-cpu x86-64 -target-feature +sse4.2 -target-feature +popcnt
-target-linker-version 2.24 -momit-leaf-frame-pointer -dwarf-column-info
-coverage-file /disk5/chh/Debug/fp128/b.c -resource-dir
/disk5/chh/LLVM/llvm.0713/Release+Asserts/bin/../lib/clang/3.7.0
-internal-isystem /usr/local/include -internal-isystem
/disk5/chh/LLVM/llvm.0713/Release+Asserts/bin/../lib/clang/3.7.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O2
-fdebug-compilation-dir /disk5/chh/Debug/fp128 -ferror-limit 19
-fmessage-length 159 -mstackrealign -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o b.o -x c /tmp/debug/b.c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module '/tmp/debug/b.c'.
4. Running pass 'X86 DAG->DAG Instruction Selection' on function
'@Testscalbnl'
clang: error: unable to execute command: Aborted (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.7.0 (<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_git_clang.git&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=PM934QObeXxlbdJ0zFPPU2vB1UqDJaLFxJXrN_8MSvw&s=NzNgcwDGr49sSh6TZLvX6am9VT0R4m5U4n6qhd2LbUc&e=">http://llvm.org/git/clang.git</a>
9ad5a5061202c22d3e4f44fcf58711915c952af1) (<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_git_llvm.git&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=PM934QObeXxlbdJ0zFPPU2vB1UqDJaLFxJXrN_8MSvw&s=_cAPpLlC0ZLLniBF-MovrbVX7cLZsha_i1zqze-_cr0&e=">http://llvm.org/git/llvm.git</a>
da9c587dad055ebaa2781b1292d3317d1bfcac9e)
Target: x86_64--linux-android
Thread model: posix</pre>
</div>
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