[llvm-bugs] [Bug 25445] New: [WinEH] LoopStrengthReduce crashes in the presence of catchpads w/ phis

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25445

            Bug ID: 25445
           Summary: [WinEH] LoopStrengthReduce crashes in the presence of
                    catchpads w/ phis
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: david.majnemer at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

consider:
void f(int *);

void g(int *b, int *c) {
  int *e = b;
  try {
    try {
      int *d = b;
      for (;; ++d) f(d);
    } catch (...) {
    }

    e = c;
    f(c);
  } catch (...) {
    f(e);
  }
}

reproduces with:
clang -cc1 -triple i686-pc-windows-msvc18.0.0 -emit-obj -fcxx-exceptions
-fexceptions -O2

crashes in:
LoopStrengthReduce.cpp:4425: BasicBlock::iterator <anonymous
namespace>::LSRInstance::AdjustInsertPositionForExpand(BasicBlock::iterator,
const <anonymous>::LSRFixup &, const <anonymous>::LSRUse &, llvm::SCEVExpander
&) const: Assertion `!isa<PHINode>(LowestIP) && !LowestIP->isEHPad() &&
!isa<DbgInfoIntrinsic>(LowestIP) && "Insertion point must be a normal
instruction"' failed.

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