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; RUN: opt < %s -basicaa -loop-interchange -S | FileCheck %s
;; We test the complete .ll for adjustment in outer loop header/latch and inner loop header/latch.
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@A = common global [100 x [100 x i32]] zeroinitializer
@B = common global [100 x i32] zeroinitializer
@C = common global [100 x [100 x i32]] zeroinitializer
@D = common global [100 x [100 x [100 x i32]]] zeroinitializer
;; Test that a flow dependency in outer loop doesn't prevent interchange in
;; loops i and j.
;;
;; for (int k = 0; k < 100; ++k) {
;; T[k] = fn1();
;; for (int i = 0; i < 1000; ++i)
;; for(int j = 1; j < 1000; ++j)
;; Arr[j][i] = Arr[j][i]+k;
;; fn2(T[k]);
;; }
@T = internal global [100 x double] zeroinitializer, align 4
@Arr = internal global [1000 x [1000 x i32]] zeroinitializer, align 4
define void @interchange_09(i32 %k) {
entry:
br label %for.body
for.cond.cleanup: ; preds = %for.cond.cleanup4
ret void
for.body: ; preds = %for.cond.cleanup4, %entry
%indvars.iv45 = phi i64 [ 0, %entry ], [ %indvars.iv.next46, %for.cond.cleanup4 ]
%call = call double @fn1()
%arrayidx = getelementptr inbounds [100 x double], [100 x double]* @T, i64 0, i64 %indvars.iv45
store double %call, double* %arrayidx, align 8
br label %for.cond6.preheader
for.cond6.preheader: ; preds = %for.cond.cleanup8, %for.body
%indvars.iv42 = phi i64 [ 0, %for.body ], [ %indvars.iv.next43, %for.cond.cleanup8 ]
br label %for.body9
for.cond.cleanup4: ; preds = %for.cond.cleanup8
%tmp = load double, double* %arrayidx, align 8
call void @fn2(double %tmp)
%indvars.iv.next46 = add nuw nsw i64 %indvars.iv45, 1
%exitcond47 = icmp ne i64 %indvars.iv.next46, 100
br i1 %exitcond47, label %for.body, label %for.cond.cleanup
for.cond.cleanup8: ; preds = %for.body9
%indvars.iv.next43 = add nuw nsw i64 %indvars.iv42, 1
%exitcond44 = icmp ne i64 %indvars.iv.next43, 1000
br i1 %exitcond44, label %for.cond6.preheader, label %for.cond.cleanup4
for.body9: ; preds = %for.body9, %for.cond6.preheader
%indvars.iv = phi i64 [ 1, %for.cond6.preheader ], [ %indvars.iv.next, %for.body9 ]
%arrayidx13 = getelementptr inbounds [1000 x [1000 x i32]], [1000 x [1000 x i32]]* @Arr, i64 0, i64 %indvars.iv, i64 %indvars.iv42
%tmp1 = load i32, i32* %arrayidx13, align 4
%tmp2 = trunc i64 %indvars.iv45 to i32
%add = add nsw i32 %tmp1, %tmp2
store i32 %add, i32* %arrayidx13, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp ne i64 %indvars.iv.next, 1000
br i1 %exitcond, label %for.body9, label %for.cond.cleanup8
}
declare double @fn1() readnone
declare void @fn2(double) readnone
;; After interchange %indvars.iv (j) should increment as the middle loop.
;; After interchange %indvars.iv42 (i) should increment with the inner most loop.
; CHECK-LABEL: @interchange_09
; CHECK: for.body:
; CHECK: %indvars.iv45 = phi i64 [ %indvars.iv.next46, %for.cond.cleanup4 ], [ 0, %for.body.preheader ]
; CHECK: %call = call double @fn1()
; CHECK: %arrayidx = getelementptr inbounds [100 x double], [100 x double]* @T, i64 0, i64 %indvars.iv45
; CHECK: store double %call, double* %arrayidx, align 8
; CHECK: br label %for.body9.preheader
; CHECK: for.cond6.preheader.preheader:
; CHECK: br label %for.cond6.preheader
; CHECK: for.cond6.preheader:
; CHECK: %indvars.iv42 = phi i64 [ %indvars.iv.next43, %for.cond.cleanup8 ], [ 0, %for.cond6.preheader.preheader ]
; CHECK: br label %for.body9.split1
; CHECK: for.body9.preheader:
; CHECK: br label %for.body9
; CHECK: for.cond.cleanup4:
; CHECK: %tmp = load double, double* %arrayidx, align 8
; CHECK: call void @fn2(double %tmp)
; CHECK: %indvars.iv.next46 = add nuw nsw i64 %indvars.iv45, 1
; CHECK: %exitcond47 = icmp ne i64 %indvars.iv.next46, 100
; CHECK: br i1 %exitcond47, label %for.body, label %for.cond.cleanup
; CHECK: for.cond.cleanup8:
; CHECK: %indvars.iv.next43 = add nuw nsw i64 %indvars.iv42, 1
; CHECK: %exitcond44 = icmp ne i64 %indvars.iv.next43, 1000
; CHECK: br i1 %exitcond44, label %for.cond6.preheader, label %for.body9.split
; CHECK: for.body9:
; CHECK: %indvars.iv = phi i64 [ %indvars.iv.next, %for.body9.split ], [ 1, %for.body9.preheader ]
; CHECK: br label %for.cond6.preheader.preheader
; CHECK: for.body9.split1:
; CHECK: %arrayidx13 = getelementptr inbounds [1000 x [1000 x i32]], [1000 x [1000 x i32]]* @Arr, i64 0, i64 %indvars.iv, i64 %indvars.iv42
; CHECK: store i32 %add, i32* %arrayidx13, align 4
; CHECK: br label %for.cond.cleanup8
; CHECK: for.body9.split:
; CHECK: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
; CHECK: %exitcond = icmp ne i64 %indvars.iv.next, 1000
; CHECK: br i1 %exitcond, label %for.body9, label %for.cond.cleanup4
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