[LLVMbugs] [Bug 20057] Assertion failied in llvm::SUnit* llvm::SchedBoundary::pickOnlyChoice(): Assertion `i <= (HazardRec->getMaxLookAhead() + MaxObservedStall) && "permanent hazard"'

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20057

Chad Rosier <mcrosier at codeaurora.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #7 from Chad Rosier <mcrosier at codeaurora.org> ---
Hi Andy,
The latter two test cases pass, but unfortunately the first does not.

This one:
; RUN: llc < %s -O3 -march=aarch64  -mcpu=cortex-a53 | FileCheck %s

define void @foo() {
entry:
  br label %loop

loop:
  %0 = call { <2 x i64>, <2 x i64>, <2 x i64>, <2 x i64> }
@llvm.aarch64.neon.ld4.v2i64.p0i8(i8* null)
  %ptr = bitcast i8* undef to <2 x i64>*
  store <2 x i64> zeroinitializer, <2 x i64>* %ptr, align 4
  %ptr1 = bitcast i8* undef to <2 x i64>*
  store <2 x i64> zeroinitializer, <2 x i64>* %ptr1, align 4
  %ptr2 = bitcast i8* undef to <2 x i64>*
  store <2 x i64> zeroinitializer, <2 x i64>* %ptr2, align 4
  %ptr3 = bitcast i8* undef to <2 x i64>*
  store <2 x i64> zeroinitializer, <2 x i64>* %ptr3, align 4
  %ptr4 = bitcast i8* undef to <2 x i64>*
  store <2 x i64> zeroinitializer, <2 x i64>* %ptr4, align 4
  br label %loop
}

declare { <2 x i64>, <2 x i64>, <2 x i64>, <2 x i64> }
@llvm.aarch64.neon.ld4.v2i64.p0i8(i8*)

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