[llvm-bugs] [Bug 24722] New: segfault in tailcallelim on 32-bit

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24722

            Bug ID: 24722
           Summary: segfault in tailcallelim on 32-bit
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: opt
          Assignee: unassignedbugs at nondot.org
          Reporter: diggsey at googlemail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The following IL will cause `opt bugpoint-reduced-simplified.ll -tailcallelim`
to segfault:

---------
; ModuleID = 'bugpoint-reduced-simplified.bc'
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i686-pc-windows-gnu"

define fastcc void @drop() {
  call fastcc void @drop()
  br label %here

here:
  ret void
}
---------

Removing the redundant branch instruction will cause it to trigger an assert
instead:

---------
Assertion failed!

Program:
C:\Users\Diggory\Projects\rust3\i686-pc-windows-gnu\llvm\Release+Asserts\bin\opt.exe
File: C:/Users/Diggory/Projects/rust3/src/llvm/include/llvm/Support/Casting.h,
Line 95

Expression: Val && "isa<> used on a null pointer"
Illegal instruction
---------

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