[llvm-bugs] [Bug 35864] New: After r320749, Assertion failed: (ScaledReg == nullptr), function SetCombinedField, file lib/CodeGen/CodeGenPrepare.cpp, line 1980.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35864

            Bug ID: 35864
           Summary: After r320749, Assertion failed: (ScaledReg ==
                    nullptr), function SetCombinedField, file
                    lib/CodeGen/CodeGenPrepare.cpp, line 1980.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: llvm-bugs at lists.llvm.org

This bug is different from bug 35805 and bug 35799.  As reported in
https://bugs.freebsd.org/224995, 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 bug 35805 and bug 35799, which regressed with
https://reviews.llvm.org/rL319302 ("[CGP] Enable complex addr mode"), this
particular bug regressed with https://reviews.llvm.org/rL320749 ("[SimplifyCFG]
don't sink common insts too soon (PR34603)"), which is apparently a fix for bug
34603.

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