[llvm-bugs] [Bug 30416] New: SROA crash (fuzz testing)

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https://llvm.org/bugs/show_bug.cgi?id=30416

            Bug ID: 30416
           Summary: SROA crash (fuzz testing)
           Product: libraries
           Version: 3.7
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: paul_robinson at playstation.sony.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17283
  --> https://llvm.org/bugs/attachment.cgi?id=17283&action=edit
Traceback from assertion

Fuzz testing got this crash; bugpoint-reduced IR file attached.
I admit it looks pretty bogus, the original IR is not quite so stupid.
But a crash is a crash, so I figured I'd file it anyway.


$ cat SROA-crash.ll
; ModuleID = 'bugpoint-reduced-simplified.bc'
; source_filename = "bugpoint-output-0a7776e.bc"
target triple = "x86_64-scei-ps4"

; Function Attrs: norecurse noreturn nounwind
define void @autogen_SD998899922() #0 {
CF419:
  %A4 = alloca <4 x i64>, align 32
  br label %CF434

CF434:                                            ; preds = %CF434, %CF419
  br label %CF434

CF449:                                            ; preds = %CF449
  br label %CF449

CF423:                                            ; preds = %CF423
  store <4 x i64> %L38, <4 x i64>* %A4, align 32
  %L38 = load <4 x i64>, <4 x i64>* %A4, align 32
  store <4 x i64> zeroinitializer, <4 x i64>* %A4, align 32
  br label %CF423
}

attributes #0 = { noreturn nounwind }
$ opt -sroa SROA-crash.ll -S -o output.ll
opt: /home/probinson/projects/llvm-org/trunk/llvm/lib/IR/Value.cpp:373: void
llv
m::Value::replaceAllUsesWith(llvm::Value*): Assertion `!contains(New, this) &&
"
this->replaceAllUsesWith(expr(this)) is NOT valid!"' failed.

(full log attached)

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