[llvm-bugs] [Bug 47199] New: Using -ftrapv-handler with __int128 arithmetic generates broken IR

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47199

            Bug ID: 47199
           Summary: Using -ftrapv-handler with __int128 arithmetic
                    generates broken IR
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: craig.topper at gmail.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Using -ftrapv-handler with __int128 arithmetic causes clang to emit a sext i128
to i64. For example this

__int128 foo(__int128 x) {
  return -x;
}

https://godbolt.org/z/5EPK5d

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