; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
; RUN: llc < %s -mtriple=riscv64 -mattr=+v | FileCheck %s

declare i64 @llvm.vscale.i64()
declare float @llvm.vector.reduce.fadd.nxv4f32(float, <vscale x 4 x float>)

define float @reduce_fadd(ptr %f) {
; CHECK-LABEL: reduce_fadd:
; CHECK:       # %bb.0: # %entry
; CHECK-NEXT:    csrr a2, vlenb
; CHECK-NEXT:    srli a1, a2, 1
; CHECK-NEXT:    vsetvli a3, zero, e32, m1, ta, ma
; CHECK-NEXT:    vmv.s.x v8, zero
; CHECK-NEXT:    slli a2, a2, 1
; CHECK-NEXT:    li a3, 1024
; CHECK-NEXT:  .LBB0_1: # %vector.body
; CHECK-NEXT:    # =>This Inner Loop Header: Depth=1
; CHECK-NEXT:    vl2re32.v v10, (a0)
; CHECK-NEXT:    vsetvli a4, zero, e32, m2, ta, ma
; CHECK-NEXT:    vfredosum.vs v8, v10, v8
; CHECK-NEXT:    sub a3, a3, a1
; CHECK-NEXT:    add a0, a0, a2
; CHECK-NEXT:    bnez a3, .LBB0_1
; CHECK-NEXT:  # %bb.2: # %exit
; CHECK-NEXT:    vfmv.f.s fa0, v8
; CHECK-NEXT:    ret
entry:
  %vscale = tail call i64 @llvm.vscale.i64()
  %vecsize = shl nuw nsw i64 %vscale, 2
  br label %vector.body

vector.body:
  %index = phi i64 [ 0, %entry ], [ %index.next, %vector.body ]
  %vec.phi = phi float [ 0.000000e+00, %entry ], [ %acc, %vector.body ]
  %gep = getelementptr inbounds float, ptr %f, i64 %index
  %wide.load = load <vscale x 4 x float>, ptr %gep, align 4
  %acc = tail call float @llvm.vector.reduce.fadd.nxv4f32(float %vec.phi, <vscale x 4 x float> %wide.load)
  %index.next = add nuw i64 %index, %vecsize
  %done = icmp eq i64 %index.next, 1024
  br i1 %done, label %exit, label %vector.body

exit:
  ret float %acc
}