[llvm-bugs] [Bug 34841] New: InstCombine - Assertion "Cannot convert from scalar to/from vector"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34841

            Bug ID: 34841
           Summary: InstCombine - Assertion "Cannot convert from scalar
                    to/from vector"
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: babokin at gmail.com
                CC: llvm-bugs at lists.llvm.org

clang trunk rev 314936, x86_64

> cat f.cpp
typedef unsigned b __attribute__((ext_vector_type(2)));
b c;
void d() {
  b a(4 << 1 / ~(1 - 4 | c));
  0 >> a - 4;
}

> clang++ -c -O2 -w f.cpp
clang-6.0: /home/dybaboki/llvm/llvm-trunk-20171004/lib/IR/Constants.cpp:1575:
static llvm::Constant *llvm::ConstantExpr::getZExt(llvm::Constant *, llvm::Type
*, bool): Assertion `(fromVec == toVec) && "Cannot convert from scalar to/from
vector"' failed.
#0 0x000000000135083f llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/dybaboki/llvm/bin-trunk-20171004/bin/clang-6.0+0x135083f)
#1 0x0000000001350b46 SignalHandler(int)
(/home/dybaboki/llvm/bin-trunk-20171004/bin/clang-6.0+0x1350b46)
#2 0x00007f1e0819f370 __restore_rt (/lib64/libpthread.so.0+0xf370)
#3 0x00007f1e06d1b1d7 __GI_raise (/lib64/libc.so.6+0x351d7)
#4 0x00007f1e06d1c8c8 __GI_abort (/lib64/libc.so.6+0x368c8)
#5 0x00007f1e06d14146 __assert_fail_base (/lib64/libc.so.6+0x2e146)
#6 0x00007f1e06d141f2 (/lib64/libc.so.6+0x2e1f2)
#7 0x0000000000e547ba llvm::ConstantExpr::getZExt(llvm::Constant*, llvm::Type*,
bool) (/home/dybaboki/llvm/bin-trunk-20171004/bin/clang-6.0+0xe547ba)
#8 0x0000000001025fe5 llvm::InstCombiner::transformZExtICmp(llvm::ICmpInst*,
llvm::ZExtInst&, bool)
(/home/dybaboki/llvm/bin-trunk-20171004/bin/clang-6.0+0x1025fe5)
#9 0x000000000102691d llvm::InstCombiner::visitZExt(llvm::ZExtInst&)
(/home/dybaboki/llvm/bin-trunk-20171004/bin/clang-6.0+0x102691d)
#10 0x0000000000fed2f3 llvm::InstCombiner::run()
(/home/dybaboki/llvm/bin-trunk-20171004/bin/clang-6.0+0xfed2f3)

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