; RUN: not --crash llc -mtriple=amdgcn--amdhsa -mcpu=gfx900 -verify-machineinstrs -o /dev/null %s 2>&1 | FileCheck %s

; This ends up needing to spill SGPRs to memory, and also does not
; have any free SGPRs available to save the exec mask when doing so.
; The register scavenger also needs to use the emergency stack slot,
; which tries to place the scavenged register restore instruction as
; far the block as possible, near the terminator. This places a
; restore instruction between the condition and the conditional
; branch, which gets expanded into a sequence involving s_not_b64 on
; the exec mask, clobbering SCC value before the branch. We probably
; have to stop relying on being able to flip and restore the exec
; mask, and always require a free SGPR for saving exec.

; CHECK: *** Bad machine code: Using an undefined physical register ***
; CHECK-NEXT: - function:    kernel0
; CHECK-NEXT: - basic block: %bb.0
; CHECK-NEXT: - instruction: S_CBRANCH_SCC1 %bb.2, implicit killed $scc
; CHECK-NEXT: - operand 1:   implicit killed $scc
define amdgpu_kernel void @kernel0(i32 addrspace(1)* %out, i32 %in) #1 {
  call void asm sideeffect "", "~{v[0:7]}" () #0
  call void asm sideeffect "", "~{v[8:15]}" () #0
  call void asm sideeffect "", "~{v[16:19]}"() #0
  call void asm sideeffect "", "~{v[20:21]}"() #0
  call void asm sideeffect "", "~{v22}"() #0

  %val0 = call <2 x i32> asm sideeffect "; def $0", "=s" () #0
  %val1 = call <4 x i32> asm sideeffect "; def $0", "=s" () #0
  %val2 = call <8 x i32> asm sideeffect "; def $0", "=s" () #0
  %val3 = call <16 x i32> asm sideeffect "; def $0", "=s" () #0
  %val4 = call <2 x i32> asm sideeffect "; def $0", "=s" () #0
  %val5 = call <4 x i32> asm sideeffect "; def $0", "=s" () #0
  %val6 = call <8 x i32> asm sideeffect "; def $0", "=s" () #0
  %val7 = call <16 x i32> asm sideeffect "; def $0", "=s" () #0
  %val8 = call <2 x i32> asm sideeffect "; def $0", "=s" () #0
  %val9 = call <4 x i32> asm sideeffect "; def $0", "=s" () #0
  %val10 = call <8 x i32> asm sideeffect "; def $0", "=s" () #0
  %val11 = call <16 x i32> asm sideeffect "; def $0", "=s" () #0
  %val12 = call <2 x i32> asm sideeffect "; def $0", "=s" () #0
  %val13 = call <4 x i32> asm sideeffect "; def $0", "=s" () #0
  %val14 = call <8 x i32> asm sideeffect "; def $0", "=s" () #0
  %val15 = call <16 x i32> asm sideeffect "; def $0", "=s" () #0
  %val16 = call <2 x i32> asm sideeffect "; def $0", "=s" () #0
  %val17 = call <4 x i32> asm sideeffect "; def $0", "=s" () #0
  %val18 = call <8 x i32> asm sideeffect "; def $0", "=s" () #0
  %val19 = call <16 x i32> asm sideeffect "; def $0", "=s" () #0
  %cmp = icmp eq i32 %in, 0
  br i1 %cmp, label %bb0, label %ret

bb0:
  call void asm sideeffect "; use $0", "s"(<2 x i32> %val0) #0
  call void asm sideeffect "; use $0", "s"(<4 x i32> %val1) #0
  call void asm sideeffect "; use $0", "s"(<8 x i32> %val2) #0
  call void asm sideeffect "; use $0", "s"(<16 x i32> %val3) #0
  call void asm sideeffect "; use $0", "s"(<2 x i32> %val4) #0
  call void asm sideeffect "; use $0", "s"(<4 x i32> %val5) #0
  call void asm sideeffect "; use $0", "s"(<8 x i32> %val6) #0
  call void asm sideeffect "; use $0", "s"(<16 x i32> %val7) #0
  call void asm sideeffect "; use $0", "s"(<2 x i32> %val8) #0
  call void asm sideeffect "; use $0", "s"(<4 x i32> %val9) #0
  call void asm sideeffect "; use $0", "s"(<8 x i32> %val10) #0
  call void asm sideeffect "; use $0", "s"(<16 x i32> %val11) #0
  call void asm sideeffect "; use $0", "s"(<2 x i32> %val12) #0
  call void asm sideeffect "; use $0", "s"(<4 x i32> %val13) #0
  call void asm sideeffect "; use $0", "s"(<8 x i32> %val14) #0
  call void asm sideeffect "; use $0", "s"(<16 x i32> %val15) #0
  call void asm sideeffect "; use $0", "s"(<2 x i32> %val16) #0
  call void asm sideeffect "; use $0", "s"(<4 x i32> %val17) #0
  call void asm sideeffect "; use $0", "s"(<8 x i32> %val18) #0
  call void asm sideeffect "; use $0", "s"(<16 x i32> %val19) #0
  br label %ret

ret:
  ret void
}

attributes #0 = { nounwind }
attributes #1 = { nounwind "amdgpu-waves-per-eu"="10,10" }