llvm/llvm/test/CodeGen/AArch64/sve-ptest-removal-sink.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64 -mattr=+sve < %s | FileCheck %s

;
; Ensure that the %ptrue from the preheader is sunk into the loop such that the ptest is removed.
;

define void @test_sink_ptrue_into_ptest(i32 %n) {
; CHECK-LABEL: test_sink_ptrue_into_ptest:
; CHECK:       // %bb.0: // %entry
; CHECK-NEXT:    whilelt p0.s, wzr, w0
; CHECK-NEXT:    b.pl .LBB0_3
; CHECK-NEXT:  // %bb.1: // %for.body.preheader
; CHECK-NEXT:    mov w8, wzr
; CHECK-NEXT:    cntw x9
; CHECK-NEXT:  .LBB0_2: // %for.body
; CHECK-NEXT:    // =>This Inner Loop Header: Depth=1
; CHECK-NEXT:    whilelt p0.s, w8, w0
; CHECK-NEXT:    add w8, w8, w9
; CHECK-NEXT:    b.mi .LBB0_2
; CHECK-NEXT:  .LBB0_3: // %exit
; CHECK-NEXT:    ret
entry:
  %vscale = tail call i32 @llvm.vscale.i32()
  %step = shl nuw nsw i32 %vscale, 2
  %ptrue.ph = tail call <vscale x 4 x i1> @llvm.aarch64.sve.ptrue.nxv4i1(i32 31)
  %while.ph = tail call <vscale x 4 x i1> @llvm.aarch64.sve.whilelt.nxv4i1.i32(i32 0, i32 %n)
  %ptest.ph = tail call i1 @llvm.aarch64.sve.ptest.first.nxv4i1(<vscale x 4 x i1> %ptrue.ph, <vscale x 4 x i1> %while.ph)
  br i1 %ptest.ph, label %for.body, label %exit

for.body:
  %i = phi i32 [ 0, %entry ], [ %i.next, %for.body ]
  %i.next = add i32 %i, %step
  %while = call <vscale x 4 x i1> @llvm.aarch64.sve.whilelt.nxv4i1.i32(i32 %i, i32 %n)
  %ptest = call i1 @llvm.aarch64.sve.ptest.first.nxv4i1(<vscale x 4 x i1> %ptrue.ph, <vscale x 4 x i1> %while)
  br i1 %ptest, label %for.body, label %exit

exit:
  ret void
}

declare i32 @llvm.vscale.i32()
declare <vscale x 4 x i1> @llvm.aarch64.sve.ptrue.nxv4i1(i32 immarg)
declare <vscale x 4 x i1> @llvm.aarch64.sve.whilelt.nxv4i1.i32(i32, i32)
declare i1 @llvm.aarch64.sve.ptest.first.nxv4i1(<vscale x 4 x i1>, <vscale x 4 x i1>)