simple.ll
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; RUN: opt -S -loop-fusion < %s | FileCheck %s
@B = common global [1024 x i32] zeroinitializer, align 16
; CHECK: void @dep_free
; CHECK-NEXT: bb:
; CHECK-NEXT: br label %[[LOOP1HEADER:bb[0-9]*]]
; CHECK: [[LOOP1HEADER]]
; CHECK: br label %[[LOOP2HEADER:bb[0-9]*]]
; CHECK: [[LOOP2HEADER]]
; CHECK: br label %[[LOOP2LATCH:bb[0-9]+]]
; CHECK: [[LOOP2LATCH]]
; CHECK: br i1 %{{.*}}, label %[[LOOP1HEADER]], label %{{.*}}
; CHECK: ret void
define void @dep_free(i32* noalias %arg) {
bb:
br label %bb7
bb7: ; preds = %bb, %bb14
%.014 = phi i32 [ 0, %bb ], [ %tmp15, %bb14 ]
%indvars.iv23 = phi i64 [ 0, %bb ], [ %indvars.iv.next3, %bb14 ]
%tmp = add nsw i32 %.014, -3
%tmp8 = add nuw nsw i64 %indvars.iv23, 3
%tmp9 = trunc i64 %tmp8 to i32
%tmp10 = mul nsw i32 %tmp, %tmp9
%tmp11 = trunc i64 %indvars.iv23 to i32
%tmp12 = srem i32 %tmp10, %tmp11
%tmp13 = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv23
store i32 %tmp12, i32* %tmp13, align 4
br label %bb14
bb14: ; preds = %bb7
%indvars.iv.next3 = add nuw nsw i64 %indvars.iv23, 1
%tmp15 = add nuw nsw i32 %.014, 1
%exitcond4 = icmp ne i64 %indvars.iv.next3, 100
br i1 %exitcond4, label %bb7, label %bb17.preheader
bb17.preheader: ; preds = %bb14
br label %bb19
bb19: ; preds = %bb17.preheader, %bb27
%.02 = phi i32 [ 0, %bb17.preheader ], [ %tmp28, %bb27 ]
%indvars.iv1 = phi i64 [ 0, %bb17.preheader ], [ %indvars.iv.next, %bb27 ]
%tmp20 = add nsw i32 %.02, -3
%tmp21 = add nuw nsw i64 %indvars.iv1, 3
%tmp22 = trunc i64 %tmp21 to i32
%tmp23 = mul nsw i32 %tmp20, %tmp22
%tmp24 = trunc i64 %indvars.iv1 to i32
%tmp25 = srem i32 %tmp23, %tmp24
%tmp26 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %indvars.iv1
store i32 %tmp25, i32* %tmp26, align 4
br label %bb27
bb27: ; preds = %bb19
%indvars.iv.next = add nuw nsw i64 %indvars.iv1, 1
%tmp28 = add nuw nsw i32 %.02, 1
%exitcond = icmp ne i64 %indvars.iv.next, 100
br i1 %exitcond, label %bb19, label %bb18
bb18: ; preds = %bb27
br label %bb29
bb29: ; preds = %bb18
ret void
}
; CHECK: void @dep_free_parametric
; CHECK-NEXT: bb:
; CHECK: br i1 %{{.*}}, label %[[LOOP1PREHEADER:bb[0-9.a-z]*]], label %[[EXITBLOCK:bb[0-9]*]]
; CHECK: [[LOOP1PREHEADER]]
; CHECK: br label %[[LOOP1HEADER:bb[0-9]*]]
; CHECK: [[LOOP1HEADER]]
; CHECK: br label %[[LOOP2HEADER:bb[0-9]*]]
; CHECK: [[LOOP2HEADER]]
; CHECK: br label %[[LOOP2LATCH:bb[0-9]+]]
; CHECK: [[LOOP2LATCH]]
; CHECK: br i1 %{{.*}}, label %[[LOOP1HEADER]], label %[[EXITBLOCK]]
; CHECK: ret void
define void @dep_free_parametric(i32* noalias %arg, i64 %arg2) {
bb:
%tmp3 = icmp slt i64 0, %arg2
br i1 %tmp3, label %bb5, label %bb15.preheader
bb5: ; preds = %bb5, %bb12
%.014 = phi i64 [ 0, %bb ], [ %tmp13, %bb12 ]
%tmp6 = add nsw i64 %.014, -3
%tmp7 = add nuw nsw i64 %.014, 3
%tmp8 = mul nsw i64 %tmp6, %tmp7
%tmp9 = srem i64 %tmp8, %.014
%tmp10 = trunc i64 %tmp9 to i32
%tmp11 = getelementptr inbounds i32, i32* %arg, i64 %.014
store i32 %tmp10, i32* %tmp11, align 4
br label %bb12
bb12: ; preds = %bb5
%tmp13 = add nuw nsw i64 %.014, 1
%tmp = icmp slt i64 %tmp13, %arg2
br i1 %tmp, label %bb5, label %bb15.preheader
bb15.preheader: ; preds = %bb12, %bb
%tmp161 = icmp slt i64 0, %arg2
br i1 %tmp161, label %bb18, label %bb27
bb18: ; preds = %bb15.preheader, %bb25
%.02 = phi i64 [ 0, %bb15.preheader ], [ %tmp26, %bb25 ]
%tmp19 = add nsw i64 %.02, -3
%tmp20 = add nuw nsw i64 %.02, 3
%tmp21 = mul nsw i64 %tmp19, %tmp20
%tmp22 = srem i64 %tmp21, %.02
%tmp23 = trunc i64 %tmp22 to i32
%tmp24 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %.02
store i32 %tmp23, i32* %tmp24, align 4
br label %bb25
bb25: ; preds = %bb18
%tmp26 = add nuw nsw i64 %.02, 1
%tmp16 = icmp slt i64 %tmp26, %arg2
br i1 %tmp16, label %bb18, label %bb27
bb27: ; preds = %bb17
ret void
}
; CHECK: void @raw_only
; CHECK-NEXT: bb:
; CHECK-NEXT: br label %[[LOOP1HEADER:bb[0-9]*]]
; CHECK: [[LOOP1HEADER]]
; CHECK: br label %[[LOOP2HEADER:bb[0-9]*]]
; CHECK: [[LOOP2HEADER]]
; CHECK: br label %[[LOOP2LATCH:bb[0-9]+]]
; CHECK: [[LOOP2LATCH]]
; CHECK: br i1 %{{.*}}, label %[[LOOP1HEADER]], label %{{.*}}
; CHECK: ret void
define void @raw_only(i32* noalias %arg) {
bb:
br label %bb7
bb11.preheader: ; preds = %bb9
br label %bb13
bb7: ; preds = %bb, %bb9
%indvars.iv22 = phi i64 [ 0, %bb ], [ %indvars.iv.next3, %bb9 ]
%tmp = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv22
%tmp8 = trunc i64 %indvars.iv22 to i32
store i32 %tmp8, i32* %tmp, align 4
br label %bb9
bb9: ; preds = %bb7
%indvars.iv.next3 = add nuw nsw i64 %indvars.iv22, 1
%exitcond4 = icmp ne i64 %indvars.iv.next3, 100
br i1 %exitcond4, label %bb7, label %bb11.preheader
bb13: ; preds = %bb11.preheader, %bb18
%indvars.iv1 = phi i64 [ 0, %bb11.preheader ], [ %indvars.iv.next, %bb18 ]
%tmp14 = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv1
%tmp15 = load i32, i32* %tmp14, align 4
%tmp16 = shl nsw i32 %tmp15, 1
%tmp17 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %indvars.iv1
store i32 %tmp16, i32* %tmp17, align 4
br label %bb18
bb18: ; preds = %bb13
%indvars.iv.next = add nuw nsw i64 %indvars.iv1, 1
%exitcond = icmp ne i64 %indvars.iv.next, 100 br i1 %exitcond, label %bb13, label %bb19
bb19: ; preds = %bb18
ret void
}
; CHECK: void @raw_only_parametric
; CHECK-NEXT: bb:
; CHECK: br i1 %{{.*}}, label %[[LOOP1PREHEADER:bb[0-9.a-z]*]], label %[[EXITBLOCK:bb[0-9]*]]
; CHECK: [[LOOP1PREHEADER]]
; CHECK: br label %[[LOOP1HEADER:bb[0-9]*]]
; CHECK: [[LOOP1HEADER]]
; CHECK: br i1 %{{.*}}, label %[[LOOP1HEADER]], label %[[EXITBLOCK]]
; CHECK: ret void
define void @raw_only_parametric(i32* noalias %arg, i32 %arg4) {
bb:
%tmp = sext i32 %arg4 to i64
%tmp64 = icmp sgt i32 %arg4, 0
br i1 %tmp64, label %bb8, label %bb23
bb8: ; preds = %bb, %bb8
%indvars.iv25 = phi i64 [ %indvars.iv.next3, %bb8 ], [ 0, %bb ]
%tmp9 = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv25
%tmp10 = trunc i64 %indvars.iv25 to i32
store i32 %tmp10, i32* %tmp9, align 4
%indvars.iv.next3 = add nuw nsw i64 %indvars.iv25, 1
%tmp6 = icmp slt i64 %indvars.iv.next3, %tmp
br i1 %tmp6, label %bb8, label %bb17
bb17: ; preds = %bb8, %bb17
%indvars.iv3 = phi i64 [ %indvars.iv.next, %bb17 ], [ 0, %bb8 ]
%tmp18 = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv3
%tmp19 = load i32, i32* %tmp18, align 4
%tmp20 = shl nsw i32 %tmp19, 1
%tmp21 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %indvars.iv3
store i32 %tmp20, i32* %tmp21, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv3, 1
%tmp15 = icmp slt i64 %indvars.iv.next, %tmp
br i1 %tmp15, label %bb17, label %bb23
bb23: ; preds = %bb17, %bb
ret void
}
; CHECK: void @forward_dep
; CHECK-NEXT: bb:
; CHECK: br label %[[LOOP1HEADER:bb[0-9]*]]
; CHECK: [[LOOP1HEADER]]
; CHECK: br label %[[LOOP2HEADER:bb[0-9]*]]
; CHECK: [[LOOP2HEADER]]
; CHECK: br label %[[LOOP2LATCH:bb[0-9]+]]
; CHECK: [[LOOP2LATCH]]
; CHECK: br i1 %{{.*}}, label %[[LOOP1HEADER]], label %{{.*}}
; CHECK: ret void
define void @forward_dep(i32* noalias %arg) {
bb:
br label %bb7
bb7: ; preds = %bb, %bb14
%.013 = phi i32 [ 0, %bb ], [ %tmp15, %bb14 ]
%indvars.iv22 = phi i64 [ 0, %bb ], [ %indvars.iv.next3, %bb14 ]
%tmp = add nsw i32 %.013, -3
%tmp8 = add nuw nsw i64 %indvars.iv22, 3
%tmp9 = trunc i64 %tmp8 to i32
%tmp10 = mul nsw i32 %tmp, %tmp9
%tmp11 = trunc i64 %indvars.iv22 to i32
%tmp12 = srem i32 %tmp10, %tmp11
%tmp13 = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv22
store i32 %tmp12, i32* %tmp13, align 4
br label %bb14
bb14: ; preds = %bb7
%indvars.iv.next3 = add nuw nsw i64 %indvars.iv22, 1
%tmp15 = add nuw nsw i32 %.013, 1
%exitcond4 = icmp ne i64 %indvars.iv.next3, 100
br i1 %exitcond4, label %bb7, label %bb19
bb19: ; preds = %bb14, %bb25
%indvars.iv1 = phi i64 [ 0, %bb14 ], [ %indvars.iv.next, %bb25 ]
%tmp20 = add nsw i64 %indvars.iv1, -3
%tmp21 = getelementptr inbounds i32, i32* %arg, i64 %tmp20
%tmp22 = load i32, i32* %tmp21, align 4
%tmp23 = mul nsw i32 %tmp22, 3
%tmp24 = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv1
store i32 %tmp23, i32* %tmp24, align 4
br label %bb25
bb25: ; preds = %bb19
%indvars.iv.next = add nuw nsw i64 %indvars.iv1, 1
%exitcond = icmp ne i64 %indvars.iv.next, 100
br i1 %exitcond, label %bb19, label %bb26
bb26: ; preds = %bb25
ret void
}
; Test that instructions in loop 1 latch are moved to the beginning of loop 2
; latch iff it is proven safe. %inc.first and %cmp.first are moved, but
; `store i32 0, i32* %Ai.first` is not.
; CHECK: void @flow_dep
; CHECK-LABEL: entry:
; CHECK-NEXT: br label %for.first
; CHECK-LABEL: for.first:
; CHECK: store i32 0, i32* %Ai.first
; CHECK: %Ai.second =
; CHECK: br label %for.second.latch
; CHECK-LABEL: for.second.latch:
; CHECK-NEXT: %inc.first = add nsw i64 %i.first, 1
; CHECK-NEXT: %cmp.first = icmp slt i64 %inc.first, 100
; CHECK: br i1 %cmp.second, label %for.first, label %for.end
; CHECK-LABEL: for.end:
; CHECK-NEXT: ret void
define void @flow_dep(i32* noalias %A, i32* noalias %B) {
entry:
br label %for.first
for.first:
%i.first = phi i64 [ 0, %entry ], [ %inc.first, %for.first ]
%Ai.first = getelementptr inbounds i32, i32* %A, i64 %i.first
store i32 0, i32* %Ai.first, align 4
%inc.first = add nsw i64 %i.first, 1
%cmp.first = icmp slt i64 %inc.first, 100
br i1 %cmp.first, label %for.first, label %for.second.preheader
for.second.preheader:
br label %for.second
for.second:
%i.second = phi i64 [ %inc.second, %for.second.latch ], [ 0, %for.second.preheader ]
%Ai.second = getelementptr inbounds i32, i32* %A, i64 %i.second
%0 = load i32, i32* %Ai.second, align 4
%Bi = getelementptr inbounds i32, i32* %B, i64 %i.second
store i32 %0, i32* %Bi, align 4
br label %for.second.latch
for.second.latch:
%inc.second = add nsw i64 %i.second, 1
%cmp.second = icmp slt i64 %inc.second, 100
br i1 %cmp.second, label %for.second, label %for.end
for.end:
ret void
}
; Test that `%add` is moved in basic block entry, and the two loops for.first
; and for.second are fused.
; CHECK: i32 @moveinsts_preheader
; CHECK-LABEL: entry:
; CHECK-NEXT: %add = add nsw i32 %x, 1
; CHECK-NEXT: br label %for.first
; CHECK-LABEL: for.first:
; CHECK: br i1 %cmp.j, label %for.first, label %for.second.exit
; CHECK-LABEL: for.second.exit:
; CHECK-NEXT: ret i32 %add
define i32 @moveinsts_preheader(i32* %A, i32 %x) {
entry:
br label %for.first
for.first:
%i = phi i64 [ 0, %entry ], [ %inc.i, %for.first ]
%Ai = getelementptr inbounds i32, i32* %A, i64 %i
store i32 0, i32* %Ai, align 4
%inc.i = add nsw i64 %i, 1
%cmp.i = icmp slt i64 %inc.i, 100
br i1 %cmp.i, label %for.first, label %for.first.exit
for.first.exit:
%add = add nsw i32 %x, 1
br label %for.second
for.second:
%j = phi i64 [ 0, %for.first.exit ], [ %inc.j, %for.second ]
%Aj = getelementptr inbounds i32, i32* %A, i64 %j
store i32 2, i32* %Aj, align 4
%inc.j = add nsw i64 %j, 1
%cmp.j = icmp slt i64 %inc.j, 100
br i1 %cmp.j, label %for.second, label %for.second.exit
for.second.exit:
ret i32 %add
}
; Test that `%add` cannot be moved to basic block entry, as it uses %i, which
; defined after basic block entry. And the two loops for.first and for.second
; are not fused.
; CHECK: i64 @unsafe_preheader
; CHECK-LABEL: entry:
; CHECK-NEXT: br label %for.first
; CHECK-LABEL: for.first:
; CHECK: br i1 %cmp.i, label %for.first, label %for.first.exit
; CHECK-LABEL: for.first.exit:
; CHECK-NEXT: %add = add nsw i64 %x, %i
; CHECK-NEXT: br label %for.second
; CHECK-LABEL: for.second:
; CHECK: br i1 %cmp.j, label %for.second, label %for.second.exit
; CHECK-LABEL: for.second.exit:
; CHECK-NEXT: ret i64 %add
define i64 @unsafe_preheader(i32* %A, i64 %x) {
entry:
br label %for.first
for.first:
%i = phi i64 [ 0, %entry ], [ %inc.i, %for.first ]
%Ai = getelementptr inbounds i32, i32* %A, i64 %i
store i32 0, i32* %Ai, align 4
%inc.i = add nsw i64 %i, 1
%cmp.i = icmp slt i64 %inc.i, 100
br i1 %cmp.i, label %for.first, label %for.first.exit
for.first.exit:
%add = add nsw i64 %x, %i
br label %for.second
for.second:
%j = phi i64 [ 0, %for.first.exit ], [ %inc.j, %for.second ]
%Aj = getelementptr inbounds i32, i32* %A, i64 %j
store i32 2, i32* %Aj, align 4
%inc.j = add nsw i64 %j, 1
%cmp.j = icmp slt i64 %inc.j, 100
br i1 %cmp.j, label %for.second, label %for.second.exit
for.second.exit:
ret i64 %add
}