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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 - After r320749, Assertion failed: (ScaledReg == nullptr), function SetCombinedField, file lib/CodeGen/CodeGenPrepare.cpp, line 1980."
href="https://bugs.llvm.org/show_bug.cgi?id=35864">35864</a>
</td>
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<tr>
<th>Summary</th>
<td>After r320749, Assertion failed: (ScaledReg == nullptr), function SetCombinedField, file lib/CodeGen/CodeGenPrepare.cpp, line 1980.
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dimitry@andric.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This bug is different from <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - Assertion failed: (ScaledReg == nullptr), function SetCombinedField, file lib/CodeGen/CodeGenPrepare.cpp, line 1973."
href="show_bug.cgi?id=35805">bug 35805</a> and <a class="bz_bug_link
bz_status_NEW "
title="NEW - clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu in 32-bit mode: Assertion `ScaledReg == nullptr' failed"
href="show_bug.cgi?id=35799">bug 35799</a>. As reported in
<a href="https://bugs.freebsd.org/224995">https://bugs.freebsd.org/224995</a>, clang 6.0.0 (trunk r321545) asserts on
compiling imap/src/imapd/imapd.c of the alpine port:
(gdb) bt
#0 thr_kill () at thr_kill.S:3
#1 0x000000080347b084 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:54
#2 0x000000080347aff9 in abort () at /usr/src/lib/libc/stdlib/abort.c:67
#3 0x00000008034f8431 in __assert (func=<optimized out>, file=<optimized out>,
line=<optimized out>, failedexpr=<optimized out>) at
/usr/src/lib/libc/gen/assert.c:53
#4 0x000000000114631b in (anonymous
namespace)::CodeGenPrepare::optimizeMemoryInst(llvm::Instruction*,
llvm::Value*, llvm::Type*, unsigned int) ()
#5 0x000000000113cb5c in (anonymous
namespace)::CodeGenPrepare::optimizeInst(llvm::Instruction*, bool&) ()
#6 0x0000000001136177 in (anonymous
namespace)::CodeGenPrepare::runOnFunction(llvm::Function&) ()
#7 0x000000000152ea9a in llvm::FPPassManager::runOnFunction(llvm::Function&)
()
#8 0x000000000152ed03 in llvm::FPPassManager::runOnModule(llvm::Module&) ()
#9 0x000000000152f27b in llvm::legacy::PassManagerImpl::run(llvm::Module&) ()
#10 0x0000000001ba6f33 in clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout
const&, llvm::Module*, clang::BackendAction,
std::__1::unique_ptr<llvm::raw_pwrite_stream,
std::__1::default_delete<llvm::raw_pwrite_stream> >) ()
#11 0x0000000002118868 in
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) ()
#12 0x0000000002599af2 in clang::ParseAST(clang::Sema&, bool, bool) ()
#13 0x000000000208b68c in clang::FrontendAction::Execute() ()
#14 0x000000000201d0c1 in
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) ()
#15 0x0000000002112cee in
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) ()
#16 0x0000000000d76c95 in cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) ()
#17 0x0000000000d74d9e in main ()
The test case minimizes to:
/* clang -cc1 -triple i386 -S -O2 -vectorize-loops -vectorize-slp
imapd-minimized.c */
char c[0];
enum { d, f } e;
int i();
void m();
void n() {
char j, a, *g, b[0];
int l = i(), k = l;
g = b;
char *h = "PID=";
while (*h)
*g++ = *h++;
h = c;
do
h++;
while (k);
while (h > c)
*g++ = *--h;
switch (e)
case 0: {
h = " in";
while (*h)
*g++ = *h++;
a = 0;
break;
case 1:
h = " in";
while (*h)
*g++ = *h++;
j = 0;
}
m(g - b);
}
As opposed to <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - Assertion failed: (ScaledReg == nullptr), function SetCombinedField, file lib/CodeGen/CodeGenPrepare.cpp, line 1973."
href="show_bug.cgi?id=35805">bug 35805</a> and <a class="bz_bug_link
bz_status_NEW "
title="NEW - clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu in 32-bit mode: Assertion `ScaledReg == nullptr' failed"
href="show_bug.cgi?id=35799">bug 35799</a>, which regressed with
<a href="https://reviews.llvm.org/rL319302">https://reviews.llvm.org/rL319302</a> ("[CGP] Enable complex addr mode"), this
particular bug regressed with <a href="https://reviews.llvm.org/rL320749">https://reviews.llvm.org/rL320749</a> ("[SimplifyCFG]
don't sink common insts too soon (PR34603)"), which is apparently a fix for bug
34603.</pre>
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