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; REQUIRES: asserts
; RUN: opt < %s -basicaa -loop-interchange -verify-dom-info -verify-loop-info \
; RUN: -S -debug 2>&1 | FileCheck %s
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 [100 x [100 x i32]]] zeroinitializer
;;--------------------------------------Test case 01------------------------------------
;; [FIXME] This loop though valid is currently not interchanged due to the limitation that we cannot split the inner loop latch due to multiple use of inner induction
;; variable.(used to increment the loop counter and to access A[j+1][i+1]
;; for(int i=0;i<N-1;i++)
;; for(int j=1;j<N-1;j++)
;; A[j+1][i+1] = A[j+1][i+1] + k;
; CHECK: Not interchanging loops. Cannot prove legality.
define void @interchange_01(i32 %k, i32 %N) {
entry:
%sub = add nsw i32 %N, -1
%cmp26 = icmp sgt i32 %N, 1
br i1 %cmp26, label %for.cond1.preheader.lr.ph, label %for.end17
for.cond1.preheader.lr.ph:
%cmp324 = icmp sgt i32 %sub, 1
%0 = add i32 %N, -2
%1 = sext i32 %sub to i64
br label %for.cond1.preheader
for.cond.loopexit:
%cmp = icmp slt i64 %indvars.iv.next29, %1
br i1 %cmp, label %for.cond1.preheader, label %for.end17
for.cond1.preheader:
%indvars.iv28 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next29, %for.cond.loopexit ]
%indvars.iv.next29 = add nuw nsw i64 %indvars.iv28, 1
br i1 %cmp324, label %for.body4, label %for.cond.loopexit
for.body4:
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body4 ], [ 1, %for.cond1.preheader ]
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%arrayidx7 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv.next, i64 %indvars.iv.next29
%2 = load i32, i32* %arrayidx7
%add8 = add nsw i32 %2, %k
store i32 %add8, i32* %arrayidx7
%lftr.wideiv = trunc i64 %indvars.iv to i32
%exitcond = icmp eq i32 %lftr.wideiv, %0
br i1 %exitcond, label %for.cond.loopexit, label %for.body4
for.end17:
ret void
}
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