[llvm-bugs] [Bug 27275] New: ARM: Bad machine code: Using an undefined physical register

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27275

            Bug ID: 27275
           Summary: ARM: Bad machine code: Using an undefined physical
                    register
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: hans at chromium.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16184
  --> https://llvm.org/bugs/attachment.cgi?id=16184&action=edit
fairly reduced repro

$ clang --version
clang version 3.9.0 (trunk 265767) (llvm/trunk 265768)
$ clang -cc1 -triple thumbv7-apple-ios9.0.0 -emit-obj -Os -std=c++11 a.ii

*** Bad machine code: Using an undefined physical register ***
- function:   
_ZN53SOCKSClientSocketPoolTest_AsyncSOCKSConnectError_Test6m_fn10Ev
- basic block: BB#8 if.end (0x5e24a98)
- instruction: t2STRi12
- operand 0:   %R2<kill>
fatal error: error in backend: Found 1 machine code errors.

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