[llvm-bugs] [Bug 35767] New: Crash with alloca swifterror

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35767

            Bug ID: 35767
           Summary: Crash with alloca swifterror
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: llvm-bugs at lists.llvm.org

Reduced from https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4805

Removing the 'swifterror' attribute succeeds.

llc -mtriple=x86_64-unknown

define void @f() {
  br label %BB1

BB1:
  %A31 = alloca swifterror i32
  %L7 = load i32, i32* %A31
  %B30 = add i32 %L7, 2147483647
  store i32 %B30, i32* %A31
  store i32 %L7, i32* undef
  %C29 = icmp slt i32 %L7, %B30
  br label %BB1

  unreachable
}


********** EXPANDING POST-RA PSEUDO INSTRS **********
********** Function: f
real copy:   renamable %rcx = COPY %rsp
replaced by: %rcx = MOV64rr %rsp
real copy:   %rsp = COPY killed renamable %rcx
replaced by: %rsp = MOV64rr killed %rcx
real copy:   renamable %eax = COPY killed renamable %rax
Cannot copy RAX to EAX

Cannot emit physreg copy instruction
UNREACHABLE executed at D:\LLVM\llvm\lib\Target\X86\X86InstrInfo.cpp:6813!

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