xref: /aosp_15_r20/external/llvm/test/Transforms/LoopVersioningLICM/loopversioningLICM1.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)

; RUN: opt < %s  -O1  -S -loop-versioning-licm -licm -debug-only=loop-versioning-licm 2>&1 | FileCheck %s
; REQUIRES: asserts
;
; Test to confirm loop is a candidate for LoopVersioningLICM.
; It also confirms invariant moved out of loop.
;
; CHECK: Loop: Loop at depth 2 containing: %for.body3<header><latch><exiting>
; CHECK-NEXT:   Loop Versioning found to be beneficial
;
; CHECK: for.body3:
; CHECK-NEXT: %add86 = phi i32 [ %arrayidx7.promoted, %for.body3.ph ], [ %add8, %for.body3 ]
; CHECK-NEXT: %j.113 = phi i32 [ %j.016, %for.body3.ph ], [ %inc, %for.body3 ]
; CHECK-NEXT: %idxprom = zext i32 %j.113 to i64
; CHECK-NEXT: %arrayidx = getelementptr inbounds i32, i32* %var1, i64 %idxprom
; CHECK-NEXT: store i32 %add, i32* %arrayidx, align 4, !alias.scope !6, !noalias !6
; CHECK-NEXT: %add8 = add nsw i32 %add86, %add
; CHECK-NEXT: %inc = add nuw i32 %j.113, 1
; CHECK-NEXT: %cmp2 = icmp ult i32 %inc, %itr
; CHECK-NEXT: br i1 %cmp2, label %for.body3, label %for.inc11.loopexit.loopexit5, !llvm.loop !7
define i32 @foo(i32* nocapture %var1, i32* nocapture readnone %var2, i32* nocapture %var3, i32 %itr) #0 {
entry:
  %cmp14 = icmp eq i32 %itr, 0
  br i1 %cmp14, label %for.end13, label %for.cond1.preheader.preheader

for.cond1.preheader.preheader:                    ; preds = %entry
  br label %for.cond1.preheader

for.cond1.preheader:                              ; preds = %for.cond1.preheader.preheader, %for.inc11
  %j.016 = phi i32 [ %j.1.lcssa, %for.inc11 ], [ 0, %for.cond1.preheader.preheader ]
  %i.015 = phi i32 [ %inc12, %for.inc11 ], [ 0, %for.cond1.preheader.preheader ]
  %cmp212 = icmp ult i32 %j.016, %itr
  br i1 %cmp212, label %for.body3.lr.ph, label %for.inc11

for.body3.lr.ph:                                  ; preds = %for.cond1.preheader
  %add = add i32 %i.015, %itr
  %idxprom6 = zext i32 %i.015 to i64
  %arrayidx7 = getelementptr inbounds i32, i32* %var3, i64 %idxprom6
  br label %for.body3

for.body3:                                        ; preds = %for.body3.lr.ph, %for.body3
  %j.113 = phi i32 [ %j.016, %for.body3.lr.ph ], [ %inc, %for.body3 ]
  %idxprom = zext i32 %j.113 to i64
  %arrayidx = getelementptr inbounds i32, i32* %var1, i64 %idxprom
  store i32 %add, i32* %arrayidx, align 4
  %0 = load i32, i32* %arrayidx7, align 4
  %add8 = add nsw i32 %0, %add
  store i32 %add8, i32* %arrayidx7, align 4
  %inc = add nuw i32 %j.113, 1
  %cmp2 = icmp ult i32 %inc, %itr
  br i1 %cmp2, label %for.body3, label %for.inc11.loopexit

for.inc11.loopexit:                               ; preds = %for.body3
  br label %for.inc11

for.inc11:                                        ; preds = %for.inc11.loopexit, %for.cond1.preheader
  %j.1.lcssa = phi i32 [ %j.016, %for.cond1.preheader ], [ %itr, %for.inc11.loopexit ]
  %inc12 = add nuw i32 %i.015, 1
  %cmp = icmp ult i32 %inc12, %itr
  br i1 %cmp, label %for.cond1.preheader, label %for.end13.loopexit

for.end13.loopexit:                               ; preds = %for.inc11
  br label %for.end13

for.end13:                                        ; preds = %for.end13.loopexit, %entry
  ret i32 0
}