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; REQUIRES: asserts
; RUN: opt < %s -passes=loop-interchange -verify-dom-info -verify-loop-info -S -debug 2>&1 | FileCheck %s
@A = common global [100 x [100 x i64]] zeroinitializer
@N = dso_local local_unnamed_addr global i64 100, align 8
; for(int i=0;i<100;i++)
; for(int j=0;j<i;j++)
; A[j][i] = A[j][i]+k;
;
; Inner loop induction variable exit condition depends on the
; outer loop induction variable, i.e., triangular loops.
;
; CHECK: Loop structure not understood by pass
; CHECK: Not interchanging loops. Cannot prove legality.
;
define void @interchange_01(i64 %k) {
entry:
br label %for1.header
for1.header:
%i = phi i64 [ 0, %entry ], [ %i.next, %for1.inc10 ]
br label %for2
for2:
%j = phi i64 [ %j.next, %for2 ], [ 0, %for1.header ]
%arrayidx5 = getelementptr inbounds [100 x [100 x i64]], ptr @A, i64 0, i64 %j, i64 %i
%lv = load i64, ptr %arrayidx5
%add = add nsw i64 %lv, %k
store i64 %add, ptr %arrayidx5
%j.next = add nuw nsw i64 %j, 1
%exitcond = icmp eq i64 %j, %i
br i1 %exitcond, label %for1.inc10, label %for2
for1.inc10:
%i.next = add nuw nsw i64 %i, 1
%exitcond26 = icmp eq i64 %i, 99
br i1 %exitcond26, label %for.end12, label %for1.header
for.end12:
ret void
}
; for(int i=0;i<100;i++)
; for(int j=0;j+i<100;j++)
; A[j][i] = A[j][i]+k;
;
; Inner loop induction variable exit condition depends on the
; outer loop induction variable, i.e., triangular loops.
;
; CHECK: Loop structure not understood by pass
; CHECK: Not interchanging loops. Cannot prove legality.
;
define void @interchange_02(i64 %k) {
entry:
br label %for1.header
for1.header:
%i = phi i64 [ 0, %entry ], [ %i.next, %for1.inc10 ]
br label %for2
for2:
%j = phi i64 [ %j.next, %for2 ], [ 0, %for1.header ]
%arrayidx5 = getelementptr inbounds [100 x [100 x i64]], ptr @A, i64 0, i64 %j, i64 %i
%lv = load i64, ptr %arrayidx5
%add = add nsw i64 %lv, %k
store i64 %add, ptr %arrayidx5
%0 = add nuw nsw i64 %j, %i
%j.next = add nuw nsw i64 %j, 1
%exitcond = icmp eq i64 %0, 100
br i1 %exitcond, label %for1.inc10, label %for2
for1.inc10:
%i.next = add nuw nsw i64 %i, 1
%exitcond26 = icmp eq i64 %i, 99
br i1 %exitcond26, label %for.end12, label %for1.header
for.end12:
ret void
}
; for(int i=0;i<100;i++)
; for(int j=0;i>j;j++)
; A[j][i] = A[j][i]+k;
;
; Inner loop induction variable exit condition depends on the
; outer loop induction variable, i.e., triangular loops.
; CHECK: Loop structure not understood by pass
; CHECK: Not interchanging loops. Cannot prove legality.
;
define void @interchange_03(i64 %k) {
entry:
br label %for1.header
for1.header:
%i = phi i64 [ 0, %entry ], [ %i.next, %for1.inc10 ]
br label %for2
for2:
%j = phi i64 [ %j.next, %for2 ], [ 0, %for1.header ]
%arrayidx5 = getelementptr inbounds [100 x [100 x i64]], ptr @A, i64 0, i64 %j, i64 %i
%lv = load i64, ptr %arrayidx5
%add = add nsw i64 %lv, %k
store i64 %add, ptr %arrayidx5
%j.next = add nuw nsw i64 %j, 1
%exitcond = icmp ne i64 %i, %j
br i1 %exitcond, label %for2, label %for1.inc10
for1.inc10:
%i.next = add nuw nsw i64 %i, 1
%exitcond26 = icmp eq i64 %i, 99
br i1 %exitcond26, label %for.end12, label %for1.header
for.end12:
ret void
}
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