phi-ordering.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -loop-interchange -verify-dom-info -verify-loop-info -verify-scev -verify-loop-lcssa -loop-interchange-threshold=-1000 -S 2>&1 | FileCheck %s
;; Checks the order of the inner phi nodes does not cause havoc.
;; The inner loop has a reduction into c. The IV is not the first phi.
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "armv8--linux-gnueabihf"
; Function Attrs: norecurse nounwind
define void @test(i32 %T, [90 x i32]* noalias nocapture %C, i16* noalias nocapture readonly %A, i16* noalias nocapture readonly %B) local_unnamed_addr #0 {
; CHECK-LABEL: @test(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR3_PREHEADER:%.*]]
; CHECK: for1.header.preheader:
; CHECK-NEXT: br label [[FOR1_HEADER:%.*]]
; CHECK: for1.header:
; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[INC20:%.*]], [[FOR1_INC19:%.*]] ], [ 0, [[FOR1_HEADER_PREHEADER:%.*]] ]
; CHECK-NEXT: [[MUL:%.*]] = mul nsw i32 [[I]], 90
; CHECK-NEXT: br label [[FOR2_HEADER_PREHEADER:%.*]]
; CHECK: for2.header.preheader:
; CHECK-NEXT: br label [[FOR2_HEADER:%.*]]
; CHECK: for2.header:
; CHECK-NEXT: [[J:%.*]] = phi i32 [ [[INC17:%.*]], [[FOR2_INC16:%.*]] ], [ 0, [[FOR2_HEADER_PREHEADER]] ]
; CHECK-NEXT: br label [[FOR3_SPLIT1:%.*]]
; CHECK: for3.preheader:
; CHECK-NEXT: br label [[FOR3:%.*]]
; CHECK: for3:
; CHECK-NEXT: [[K:%.*]] = phi i32 [ [[TMP1:%.*]], [[FOR3_SPLIT:%.*]] ], [ 1, [[FOR3_PREHEADER]] ]
; CHECK-NEXT: br label [[FOR1_HEADER_PREHEADER]]
; CHECK: for3.split1:
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[K]], [[MUL]]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i16, i16* [[A:%.*]], i32 [[ADD]]
; CHECK-NEXT: [[TMP0:%.*]] = load i16, i16* [[ARRAYIDX]], align 2
; CHECK-NEXT: [[ADD15:%.*]] = add nsw i16 [[TMP0]], 1
; CHECK-NEXT: store i16 [[ADD15]], i16* [[ARRAYIDX]]
; CHECK-NEXT: [[INC:%.*]] = add nuw nsw i32 [[K]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i32 [[INC]], 90
; CHECK-NEXT: br label [[FOR2_INC16]]
; CHECK: for3.split:
; CHECK-NEXT: [[TMP1]] = add nuw nsw i32 [[K]], 1
; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i32 [[TMP1]], 90
; CHECK-NEXT: br i1 [[TMP2]], label [[FOR1_LOOPEXIT:%.*]], label [[FOR3]]
; CHECK: for2.inc16:
; CHECK-NEXT: [[INC17]] = add nuw nsw i32 [[J]], 1
; CHECK-NEXT: [[EXITCOND47:%.*]] = icmp eq i32 [[INC17]], 90
; CHECK-NEXT: br i1 [[EXITCOND47]], label [[FOR1_INC19]], label [[FOR2_HEADER]]
; CHECK: for1.inc19:
; CHECK-NEXT: [[INC20]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT: [[EXITCOND48:%.*]] = icmp eq i32 [[INC20]], 90
; CHECK-NEXT: br i1 [[EXITCOND48]], label [[FOR3_SPLIT]], label [[FOR1_HEADER]]
; CHECK: for1.loopexit:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
entry:
br label %for1.header
for1.header: ; preds = %entry
%i = phi i32 [ %inc20, %for1.inc19 ], [ 0, %entry ]
%mul = mul nsw i32 %i, 90
br label %for2.header
for2.header: ; preds = %for2.inc16, %for1.header
%j = phi i32 [ 0, %for1.header ], [ %inc17, %for2.inc16 ]
br label %for3
for3: ; preds = %for3, %for2.header
%k = phi i32 [ 1, %for2.header ], [ %inc, %for3 ]
%add = add nsw i32 %k, %mul
%arrayidx = getelementptr inbounds i16, i16* %A, i32 %add
%0 = load i16, i16* %arrayidx, align 2
%add15 = add nsw i16 %0, 1
store i16 %add15, i16* %arrayidx
%inc = add nuw nsw i32 %k, 1
%exitcond = icmp eq i32 %inc, 90
br i1 %exitcond, label %for2.inc16, label %for3
for2.inc16: ; preds = %for.body6
%inc17 = add nuw nsw i32 %j, 1
%exitcond47 = icmp eq i32 %inc17, 90
br i1 %exitcond47, label %for1.inc19, label %for2.header
for1.inc19: ; preds = %for2.inc16
%inc20 = add nuw nsw i32 %i, 1
%exitcond48 = icmp eq i32 %inc20, 90
br i1 %exitcond48, label %for1.loopexit, label %for1.header
for1.loopexit: ; preds = %for1.inc19
br label %exit
exit: ; preds = %for1.loopexit
ret void
}