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llvm/llvm/test/CodeGen/RISCV/regalloc-last-chance-recoloring-failure.ll 

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=riscv64 -mattr=+f,+m,+zfh,+zvfh \
; RUN:   -enable-subreg-liveness=false < %s | FileCheck %s
; RUN: llc -mtriple=riscv64 -mattr=+f,+m,+zfh,+zvfh < %s \
; RUN:   -enable-subreg-liveness=true| FileCheck %s --check-prefix=SUBREGLIVENESS

; This testcase failed to compile after
; c46aab01c002b7a04135b8b7f1f52d8c9ae23a58, which was reverted.

; FIXME: The failure does not reproduce with -stop-before=greedy
; output MIR with -start-before=greedy

define void @last_chance_recoloring_failure() {
; CHECK-LABEL: last_chance_recoloring_failure:
; CHECK:       # %bb.0: # %entry
; CHECK-NEXT:    addi sp, sp, -32
; CHECK-NEXT:    .cfi_def_cfa_offset 32
; CHECK-NEXT:    sd ra, 24(sp) # 8-byte Folded Spill
; CHECK-NEXT:    sd s0, 16(sp) # 8-byte Folded Spill
; CHECK-NEXT:    .cfi_offset ra, -8
; CHECK-NEXT:    .cfi_offset s0, -16
; CHECK-NEXT:    csrr a0, vlenb
; CHECK-NEXT:    slli a0, a0, 4
; CHECK-NEXT:    sub sp, sp, a0
; CHECK-NEXT:    .cfi_escape 0x0f, 0x0d, 0x72, 0x00, 0x11, 0x20, 0x22, 0x11, 0x10, 0x92, 0xa2, 0x38, 0x00, 0x1e, 0x22 # sp + 32 + 16 * vlenb
; CHECK-NEXT:    li a0, 55
; CHECK-NEXT:    vsetvli zero, a0, e16, m4, ta, ma
; CHECK-NEXT:    vloxseg2ei32.v v16, (a1), v8
; CHECK-NEXT:    csrr a0, vlenb
; CHECK-NEXT:    slli a0, a0, 3
; CHECK-NEXT:    add a0, sp, a0
; CHECK-NEXT:    addi a0, a0, 16
; CHECK-NEXT:    csrr a1, vlenb
; CHECK-NEXT:    slli a1, a1, 2
; CHECK-NEXT:    vs4r.v v16, (a0) # Unknown-size Folded Spill
; CHECK-NEXT:    add a0, a0, a1
; CHECK-NEXT:    vs4r.v v20, (a0) # Unknown-size Folded Spill
; CHECK-NEXT:    vsetvli a0, zero, e8, m2, ta, ma
; CHECK-NEXT:    vmclr.m v0
; CHECK-NEXT:    li s0, 36
; CHECK-NEXT:    vsetvli zero, s0, e16, m4, ta, ma
; CHECK-NEXT:    vfwadd.vv v16, v8, v12, v0.t
; CHECK-NEXT:    addi a0, sp, 16
; CHECK-NEXT:    vs8r.v v16, (a0) # Unknown-size Folded Spill
; CHECK-NEXT:    call func
; CHECK-NEXT:    csrr a0, vlenb
; CHECK-NEXT:    slli a0, a0, 3
; CHECK-NEXT:    add a0, sp, a0
; CHECK-NEXT:    addi a0, a0, 16
; CHECK-NEXT:    csrr a1, vlenb
; CHECK-NEXT:    slli a1, a1, 2
; CHECK-NEXT:    vl4r.v v16, (a0) # Unknown-size Folded Reload
; CHECK-NEXT:    add a0, a0, a1
; CHECK-NEXT:    vl4r.v v20, (a0) # Unknown-size Folded Reload
; CHECK-NEXT:    addi a0, sp, 16
; CHECK-NEXT:    vl8r.v v24, (a0) # Unknown-size Folded Reload
; CHECK-NEXT:    vsetvli zero, s0, e16, m4, ta, ma
; CHECK-NEXT:    vfwsub.wv v8, v24, v16
; CHECK-NEXT:    vsetvli zero, zero, e32, m8, tu, mu
; CHECK-NEXT:    vfdiv.vv v8, v24, v8, v0.t
; CHECK-NEXT:    vse32.v v8, (a0)
; CHECK-NEXT:    csrr a0, vlenb
; CHECK-NEXT:    slli a0, a0, 4
; CHECK-NEXT:    add sp, sp, a0
; CHECK-NEXT:    ld ra, 24(sp) # 8-byte Folded Reload
; CHECK-NEXT:    ld s0, 16(sp) # 8-byte Folded Reload
; CHECK-NEXT:    addi sp, sp, 32
; CHECK-NEXT:    ret
;
; SUBREGLIVENESS-LABEL: last_chance_recoloring_failure:
; SUBREGLIVENESS:       # %bb.0: # %entry
; SUBREGLIVENESS-NEXT:    addi sp, sp, -32
; SUBREGLIVENESS-NEXT:    .cfi_def_cfa_offset 32
; SUBREGLIVENESS-NEXT:    sd ra, 24(sp) # 8-byte Folded Spill
; SUBREGLIVENESS-NEXT:    sd s0, 16(sp) # 8-byte Folded Spill
; SUBREGLIVENESS-NEXT:    .cfi_offset ra, -8
; SUBREGLIVENESS-NEXT:    .cfi_offset s0, -16
; SUBREGLIVENESS-NEXT:    csrr a0, vlenb
; SUBREGLIVENESS-NEXT:    slli a0, a0, 4
; SUBREGLIVENESS-NEXT:    sub sp, sp, a0
; SUBREGLIVENESS-NEXT:    .cfi_escape 0x0f, 0x0d, 0x72, 0x00, 0x11, 0x20, 0x22, 0x11, 0x10, 0x92, 0xa2, 0x38, 0x00, 0x1e, 0x22 # sp + 32 + 16 * vlenb
; SUBREGLIVENESS-NEXT:    li a0, 55
; SUBREGLIVENESS-NEXT:    vsetvli zero, a0, e16, m4, ta, ma
; SUBREGLIVENESS-NEXT:    vloxseg2ei32.v v16, (a1), v8
; SUBREGLIVENESS-NEXT:    csrr a0, vlenb
; SUBREGLIVENESS-NEXT:    slli a0, a0, 3
; SUBREGLIVENESS-NEXT:    add a0, sp, a0
; SUBREGLIVENESS-NEXT:    addi a0, a0, 16
; SUBREGLIVENESS-NEXT:    csrr a1, vlenb
; SUBREGLIVENESS-NEXT:    slli a1, a1, 2
; SUBREGLIVENESS-NEXT:    vs4r.v v16, (a0) # Unknown-size Folded Spill
; SUBREGLIVENESS-NEXT:    add a0, a0, a1
; SUBREGLIVENESS-NEXT:    vs4r.v v20, (a0) # Unknown-size Folded Spill
; SUBREGLIVENESS-NEXT:    vsetvli a0, zero, e8, m2, ta, ma
; SUBREGLIVENESS-NEXT:    vmclr.m v0
; SUBREGLIVENESS-NEXT:    li s0, 36
; SUBREGLIVENESS-NEXT:    vsetvli zero, s0, e16, m4, ta, ma
; SUBREGLIVENESS-NEXT:    vfwadd.vv v16, v8, v12, v0.t
; SUBREGLIVENESS-NEXT:    addi a0, sp, 16
; SUBREGLIVENESS-NEXT:    vs8r.v v16, (a0) # Unknown-size Folded Spill
; SUBREGLIVENESS-NEXT:    call func
; SUBREGLIVENESS-NEXT:    csrr a0, vlenb
; SUBREGLIVENESS-NEXT:    slli a0, a0, 3
; SUBREGLIVENESS-NEXT:    add a0, sp, a0
; SUBREGLIVENESS-NEXT:    addi a0, a0, 16
; SUBREGLIVENESS-NEXT:    csrr a1, vlenb
; SUBREGLIVENESS-NEXT:    slli a1, a1, 2
; SUBREGLIVENESS-NEXT:    vl4r.v v16, (a0) # Unknown-size Folded Reload
; SUBREGLIVENESS-NEXT:    add a0, a0, a1
; SUBREGLIVENESS-NEXT:    vl4r.v v20, (a0) # Unknown-size Folded Reload
; SUBREGLIVENESS-NEXT:    addi a0, sp, 16
; SUBREGLIVENESS-NEXT:    vl8r.v v24, (a0) # Unknown-size Folded Reload
; SUBREGLIVENESS-NEXT:    vsetvli zero, s0, e16, m4, ta, ma
; SUBREGLIVENESS-NEXT:    vfwsub.wv v8, v24, v16
; SUBREGLIVENESS-NEXT:    vsetvli zero, zero, e32, m8, tu, mu
; SUBREGLIVENESS-NEXT:    vfdiv.vv v8, v24, v8, v0.t
; SUBREGLIVENESS-NEXT:    vse32.v v8, (a0)
; SUBREGLIVENESS-NEXT:    csrr a0, vlenb
; SUBREGLIVENESS-NEXT:    slli a0, a0, 4
; SUBREGLIVENESS-NEXT:    add sp, sp, a0
; SUBREGLIVENESS-NEXT:    ld ra, 24(sp) # 8-byte Folded Reload
; SUBREGLIVENESS-NEXT:    ld s0, 16(sp) # 8-byte Folded Reload
; SUBREGLIVENESS-NEXT:    addi sp, sp, 32
; SUBREGLIVENESS-NEXT:    ret
entry:
  %i = call target("riscv.vector.tuple", <vscale x 32 x i8>, 2) @llvm.riscv.vloxseg2.nxv16f16.nxv16i32.i64(target("riscv.vector.tuple", <vscale x 32 x i8>, 2) undef, ptr nonnull poison, <vscale x 16 x i32> poison, i64 55, i64 4)
  %i1 = tail call <vscale x 16 x half> @llvm.riscv.tuple.extract.v16f16.triscv.vector.tuple_nxv32i8_2t(target("riscv.vector.tuple", <vscale x 32 x i8>, 2) %i, i32 0)
  %i2 = call <vscale x 16 x float> @llvm.riscv.vfwadd.mask.nxv16f32.nxv16f16.nxv16f16.i64(<vscale x 16 x float> poison, <vscale x 16 x half> poison, <vscale x 16 x half> poison, <vscale x 16 x i1> zeroinitializer, i64 7, i64 36, i64 0)
  call void @func()
  %i3 = call <vscale x 16 x i16> @llvm.riscv.vrgather.vv.mask.nxv16i16.i64(<vscale x 16 x i16> poison, <vscale x 16 x i16> poison, <vscale x 16 x i16> poison, <vscale x 16 x i1> poison, i64 32, i64 0)
  %i4 = call <vscale x 16 x float> @llvm.riscv.vfwsub.w.nxv16f32.nxv16f16.i64(<vscale x 16 x float> poison, <vscale x 16 x float> %i2, <vscale x 16 x half> %i1, i64 7, i64 36)
  %i5 = call <vscale x 16 x i16> @llvm.riscv.vssubu.mask.nxv16i16.nxv16i16.i64(<vscale x 16 x i16> %i3, <vscale x 16 x i16> %i3, <vscale x 16 x i16> poison, <vscale x 16 x i1> poison, i64 32, i64 0)
  %i6 = call <vscale x 16 x float> @llvm.riscv.vfdiv.mask.nxv16f32.nxv16f32.i64(<vscale x 16 x float> %i4, <vscale x 16 x float> %i2, <vscale x 16 x float> poison, <vscale x 16 x i1> poison, i64 7, i64 36, i64 0)
  call void @llvm.riscv.vse.nxv16f32.i64(<vscale x 16 x float> %i6, ptr nonnull poison, i64 36)
  ret void
}

declare void @func()
declare target("riscv.vector.tuple", <vscale x 32 x i8>, 2) @llvm.riscv.vloxseg2.nxv16f16.nxv16i32.i64(target("riscv.vector.tuple", <vscale x 32 x i8>, 2), ptr nocapture, <vscale x 16 x i32>, i64, i64)
declare <vscale x 16 x half> @llvm.riscv.tuple.extract.v16f16.triscv.vector.tuple_nxv32i8_2t(target("riscv.vector.tuple", <vscale x 32 x i8>, 2), i32)
declare <vscale x 16 x float> @llvm.riscv.vfwadd.mask.nxv16f32.nxv16f16.nxv16f16.i64(<vscale x 16 x float>, <vscale x 16 x half>, <vscale x 16 x half>, <vscale x 16 x i1>, i64, i64, i64 immarg)
declare <vscale x 16 x i16> @llvm.riscv.vrgather.vv.mask.nxv16i16.i64(<vscale x 16 x i16>, <vscale x 16 x i16>, <vscale x 16 x i16>, <vscale x 16 x i1>, i64, i64 immarg)
declare <vscale x 16 x float> @llvm.riscv.vfwsub.w.nxv16f32.nxv16f16.i64(<vscale x 16 x float>, <vscale x 16 x float>, <vscale x 16 x half>, i64, i64)
declare <vscale x 16 x i16> @llvm.riscv.vssubu.mask.nxv16i16.nxv16i16.i64(<vscale x 16 x i16>, <vscale x 16 x i16>, <vscale x 16 x i16>, <vscale x 16 x i1>, i64, i64 immarg)
declare <vscale x 16 x float> @llvm.riscv.vfdiv.mask.nxv16f32.nxv16f32.i64(<vscale x 16 x float>, <vscale x 16 x float>, <vscale x 16 x float>, <vscale x 16 x i1>, i64, i64, i64 immarg)
declare void @llvm.riscv.vse.nxv16f32.i64(<vscale x 16 x float>, ptr nocapture, i64) #3