test/CodeGen/AMDGPU/remaining-virtual-register-operands.ll

; RUN: not --crash llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx908 -verify-machineinstrs < %s 2>&1 | FileCheck %s

; This testcase fails register allocation at the same time it performs
; virtual register splitting (by introducing VGPR to AGPR copies). We
; still need to enqueue and allocate the newly split vregs after the
; failure.

; The machine verifier complains about usage of register
; which is marked as killed in previous instruction.
; This happens due to when register allocator is out of registers
; it takes the first avialable register.

; CHECK: error: ran out of registers during register allocation
; CHECK: Bad machine code: Using an undefined physical register
define amdgpu_kernel void @alloc_failure_with_split_vregs(float %v0, float %v1) #0 {
  %agpr0 = call float asm sideeffect "; def $0", "=${a0}"()
  %agpr.vec = insertelement <16 x float> undef, float %agpr0, i32 0
  %mfma0 = call <16 x float> @llvm.amdgcn.mfma.f32.16x16x1f32(float %v0, float %v1, <16 x float> %agpr.vec, i32 0, i32 0, i32 0)
  %mfma0.3 = extractelement <16 x float> %mfma0, i32 3
  %insert = insertelement <16 x float> %mfma0, float %agpr0, i32 8
  %mfma1 = call <16 x float> @llvm.amdgcn.mfma.f32.16x16x1f32(float %v0, float %v1, <16 x float> %insert, i32 0, i32 0, i32 0)
  %mfma1.3 = extractelement <16 x float> %mfma1, i32 3
  call void asm sideeffect "; use $0", "{a1}"(float %mfma1.3)
  ret void
}

declare <16 x float> @llvm.amdgcn.mfma.f32.16x16x1f32(float, float, <16 x float>, i32 immarg, i32 immarg, i32 immarg) #1
declare i32 @llvm.amdgcn.workitem.id.x() #2

attributes #0 = { "amdgpu-waves-per-eu"="10,10" }
attributes #1 = { convergent nounwind readnone willreturn }
attributes #2 = { nounwind readnone speculatable willreturn }