forked from OSchip/llvm-project
112 lines
4.2 KiB
LLVM
112 lines
4.2 KiB
LLVM
; RUN: opt -S -loop-fusion < %s | FileCheck %s
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;
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; int A[1024][1024];
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; int B[1024][1024];
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;
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; #define EXPENSIVE_PURE_COMPUTATION(i) ((i - 3) * (i + 3) % i)
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;
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; void dep_free() {
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;
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; for (int i = 0; i < 100; i++)
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; for (int j = 0; j < 100; j++)
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; A[i][j] = EXPENSIVE_PURE_COMPUTATION(i);
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;
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; for (int i = 0; i < 100; i++)
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; for (int j = 0; j < 100; j++)
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; B[i][j] = EXPENSIVE_PURE_COMPUTATION(i);
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; }
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;
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@A = common global [1024 x [1024 x i32]] zeroinitializer, align 16
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@B = common global [1024 x [1024 x i32]] zeroinitializer, align 16
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; CHECK: void @dep_free
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; CHECK-NEXT: bb:
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; CHECK-NEXT: br label %[[LOOP1HEADER:bb[0-9]+]]
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; CHECK: [[LOOP1HEADER]]
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; CHECK: br label %[[LOOP3HEADER:bb[0-9]+]]
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; CHECK: [[LOOP3HEADER]]
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; CHECK: br label %[[LOOP2HEADER:bb[0-9]+]]
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; CHECK: [[LOOP2HEADER]]
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; CHECK: br label %[[LOOP4HEADER:bb[0-9]+]]
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; CHECK: [[LOOP4HEADER]]
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; CHECK: br i1 %{{.*}}, label %[[LOOP3HEADER]], label %[[LOOP1LATCH:bb[0-9]+]]
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; CHECK: [[LOOP1LATCH]]
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; CHECK-NEXT: %inc.outer.fc0 = add nuw nsw i64 %indvars.iv105, 1
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; CHECK-NEXT: %add.outer.fc0 = add nuw nsw i32 %.06, 1
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; CHECK-NEXT: %cmp.outer.fc0 = icmp ne i64 %inc.outer.fc0, 100
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; CHECK: br i1 %{{.*}}, label %[[LOOP1HEADER]], label %[[LOOP1EXIT:bb[0-9]*]]
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; CHECK: ret void
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; TODO: The current version of loop fusion does not allow the inner loops to be
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; fused because they are not control flow equivalent and adjacent. These are
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; limitations that can be addressed in future improvements to fusion.
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define void @dep_free() {
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bb:
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br label %bb16
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bb16: ; preds = %bb, %bb27
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%.06 = phi i32 [ 0, %bb ], [ %add.outer.fc0, %bb27 ]
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%indvars.iv105 = phi i64 [ 0, %bb ], [ %inc.outer.fc0, %bb27 ]
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br label %bb18
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bb30: ; preds = %bb27
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br label %bb33
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bb18: ; preds = %bb16, %bb25
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%indvars.iv74 = phi i64 [ 0, %bb16 ], [ %indvars.iv.next8, %bb25 ]
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%tmp = add nsw i32 %.06, -3
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%tmp19 = add nuw nsw i64 %indvars.iv105, 3
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%tmp20 = trunc i64 %tmp19 to i32
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%tmp21 = mul nsw i32 %tmp, %tmp20
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%tmp22 = trunc i64 %indvars.iv105 to i32
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%tmp23 = srem i32 %tmp21, %tmp22
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%tmp24 = getelementptr inbounds [1024 x [1024 x i32]], [1024 x [1024 x i32]]* @A, i64 0, i64 %indvars.iv105, i64 %indvars.iv74
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store i32 %tmp23, i32* %tmp24, align 4
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br label %bb25
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bb25: ; preds = %bb18
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%indvars.iv.next8 = add nuw nsw i64 %indvars.iv74, 1
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%exitcond9 = icmp ne i64 %indvars.iv.next8, 100
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br i1 %exitcond9, label %bb18, label %bb27
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bb27: ; preds = %bb25
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%inc.outer.fc0 = add nuw nsw i64 %indvars.iv105, 1
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%add.outer.fc0 = add nuw nsw i32 %.06, 1
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%cmp.outer.fc0 = icmp ne i64 %inc.outer.fc0, 100
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br i1 %cmp.outer.fc0, label %bb16, label %bb30
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bb33: ; preds = %bb30, %bb45
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%.023 = phi i32 [ 0, %bb30 ], [ %tmp46, %bb45 ]
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%indvars.iv42 = phi i64 [ 0, %bb30 ], [ %indvars.iv.next5, %bb45 ]
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br label %bb35
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bb31: ; preds = %bb45
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br label %bb47
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bb35: ; preds = %bb33, %bb43
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%indvars.iv1 = phi i64 [ 0, %bb33 ], [ %indvars.iv.next, %bb43 ]
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%tmp36 = add nsw i32 %.023, -3
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%tmp37 = add nuw nsw i64 %indvars.iv42, 3
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%tmp38 = trunc i64 %tmp37 to i32
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%tmp39 = mul nsw i32 %tmp36, %tmp38
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%tmp40 = trunc i64 %indvars.iv42 to i32
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%tmp41 = srem i32 %tmp39, %tmp40
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%tmp42 = getelementptr inbounds [1024 x [1024 x i32]], [1024 x [1024 x i32]]* @B, i64 0, i64 %indvars.iv42, i64 %indvars.iv1
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store i32 %tmp41, i32* %tmp42, align 4
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br label %bb43
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bb43: ; preds = %bb35
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%indvars.iv.next = add nuw nsw i64 %indvars.iv1, 1
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%exitcond = icmp ne i64 %indvars.iv.next, 100
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br i1 %exitcond, label %bb35, label %bb45
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bb45: ; preds = %bb43
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%indvars.iv.next5 = add nuw nsw i64 %indvars.iv42, 1
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%tmp46 = add nuw nsw i32 %.023, 1
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%exitcond6 = icmp ne i64 %indvars.iv.next5, 100
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br i1 %exitcond6, label %bb33, label %bb31
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bb47: ; preds = %bb31
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ret void
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}
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