diff --git a/llvm/test/Transforms/GVN/PRE/pre-load.ll b/llvm/test/Transforms/GVN/PRE/pre-load.ll --- a/llvm/test/Transforms/GVN/PRE/pre-load.ll +++ b/llvm/test/Transforms/GVN/PRE/pre-load.ll @@ -765,3 +765,81 @@ %vv = load i32, i32* %x, align 4 ret i32 %vv } + +declare i1 @foo() +declare i1 @bar() + +; %v3 is partially redundant, bb3 has multiple predecessors coming through +; critical edges. The other successors of those predecessors have same loads. +; We can move all loads into predecessors. + +define void @test17(i64* %p1, i64* %p2, i64* %p3, i64* %p4) +; CHECK-LABEL: @test17( +; CHECK-NEXT: entry: +; CHECK-NEXT: [[V1:%.*]] = load i64, i64* [[P1:%.*]], align 8 +; CHECK-NEXT: [[COND1:%.*]] = icmp sgt i64 [[V1]], 200 +; CHECK-NEXT: br i1 [[COND1]], label [[BB200:%.*]], label [[BB1:%.*]] +; CHECK: bb1: +; CHECK-NEXT: [[COND2:%.*]] = icmp sgt i64 [[V1]], 100 +; CHECK-NEXT: br i1 [[COND2]], label [[BB100:%.*]], label [[BB2:%.*]] +; CHECK: bb2: +; CHECK-NEXT: [[V2:%.*]] = add nsw i64 [[V1]], 1 +; CHECK-NEXT: store i64 [[V2]], i64* [[P1]], align 8 +; CHECK-NEXT: br label [[BB3:%.*]] +; CHECK: bb3: +; CHECK-NEXT: [[V3:%.*]] = load i64, i64* [[P1]], align 8 +; CHECK-NEXT: store i64 [[V3]], i64* [[P2:%.*]], align 8 +; CHECK-NEXT: ret void +; CHECK: bb100: +; CHECK-NEXT: [[COND3:%.*]] = call i1 @foo() +; CHECK-NEXT: br i1 [[COND3]], label [[BB3]], label [[BB101:%.*]] +; CHECK: bb101: +; CHECK-NEXT: [[V4:%.*]] = load i64, i64* [[P1]], align 8 +; CHECK-NEXT: store i64 [[V4]], i64* [[P3:%.*]], align 8 +; CHECK-NEXT: ret void +; CHECK: bb200: +; CHECK-NEXT: [[COND4:%.*]] = call i1 @bar() +; CHECK-NEXT: br i1 [[COND4]], label [[BB3]], label [[BB201:%.*]] +; CHECK: bb201: +; CHECK-NEXT: [[V5:%.*]] = load i64, i64* [[P1]], align 8 +; CHECK-NEXT: store i64 [[V5]], i64* [[P4:%.*]], align 8 +; CHECK-NEXT: ret void +; +{ +entry: + %v1 = load i64, i64* %p1, align 8 + %cond1 = icmp sgt i64 %v1, 200 + br i1 %cond1, label %bb200, label %bb1 + +bb1: + %cond2 = icmp sgt i64 %v1, 100 + br i1 %cond2, label %bb100, label %bb2 + +bb2: + %v2 = add nsw i64 %v1, 1 + store i64 %v2, i64* %p1, align 8 + br label %bb3 + +bb3: + %v3 = load i64, i64* %p1, align 8 + store i64 %v3, i64* %p2, align 8 + ret void + +bb100: + %cond3 = call i1 @foo() + br i1 %cond3, label %bb3, label %bb101 + +bb101: + %v4 = load i64, i64* %p1, align 8 + store i64 %v4, i64* %p3, align 8 + ret void + +bb200: + %cond4 = call i1 @bar() + br i1 %cond4, label %bb3, label %bb201 + +bb201: + %v5 = load i64, i64* %p1, align 8 + store i64 %v5, i64* %p4, align 8 + ret void +}