diff --git a/llvm/test/Transforms/LoopVectorize/X86/pr81872.ll b/llvm/test/Transforms/LoopVectorize/X86/pr81872.ll index c6b1944b20090..14acb6f57aa0c 100644 --- a/llvm/test/Transforms/LoopVectorize/X86/pr81872.ll +++ b/llvm/test/Transforms/LoopVectorize/X86/pr81872.ll @@ -3,15 +3,13 @@ target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-unknown-linux-gnu" -@global = external global ptr addrspace(1), align 8 - ; PR 81872 explains the issue. ; If we vectorize, we have a miscompile where array IV and thereby value stored in (arr[99], ; arr[98]) is calculated incorrectly since disjoint or was only disjoint because ; of dominating conditions. Dropping the disjoint to avoid poison still changes ; the behaviour since now the or is no longer equivalent to the add. -; Function Attrs: uwtable +; define void @test(ptr noundef align 8 dereferenceable_or_null(16) %arr) #0 { ; CHECK-LABEL: define void @test( ; CHECK-SAME: ptr noundef align 8 dereferenceable_or_null(16) [[ARR:%.*]]) #[[ATTR0:[0-9]+]] { @@ -45,43 +43,43 @@ define void @test(ptr noundef align 8 dereferenceable_or_null(16) %arr) #0 { ; CHECK-NEXT: br i1 true, label [[BB6:%.*]], label [[SCALAR_PH]] ; CHECK: scalar.ph: ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 87, [[MIDDLE_BLOCK]] ], [ 99, [[BB5:%.*]] ] -; CHECK-NEXT: br label [[BB15:%.*]] -; CHECK: bb15: -; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[BB20:%.*]] ] +; CHECK-NEXT: br label [[LOOP_HEADER:%.*]] +; CHECK: loop.header: +; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ] ; CHECK-NEXT: [[AND:%.*]] = and i64 [[IV]], 1 ; CHECK-NEXT: [[ICMP17:%.*]] = icmp eq i64 [[AND]], 0 -; CHECK-NEXT: br i1 [[ICMP17]], label [[BB18:%.*]], label [[BB20]], !prof [[PROF5:![0-9]+]] +; CHECK-NEXT: br i1 [[ICMP17]], label [[BB18:%.*]], label [[LOOP_LATCH]], !prof [[PROF5:![0-9]+]] ; CHECK: bb18: ; CHECK-NEXT: [[OR:%.*]] = or disjoint i64 [[IV]], 1 ; CHECK-NEXT: [[GETELEMENTPTR19:%.*]] = getelementptr inbounds i64, ptr [[ARR]], i64 [[OR]] ; CHECK-NEXT: store i64 1, ptr [[GETELEMENTPTR19]], align 8 -; CHECK-NEXT: br label [[BB20]] -; CHECK: bb20: +; CHECK-NEXT: br label [[LOOP_LATCH]] +; CHECK: loop.latch: ; CHECK-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], -1 ; CHECK-NEXT: [[ICMP22:%.*]] = icmp eq i64 [[IV_NEXT]], 90 -; CHECK-NEXT: br i1 [[ICMP22]], label [[BB6]], label [[BB15]], !prof [[PROF6:![0-9]+]], !llvm.loop [[LOOP7:![0-9]+]] +; CHECK-NEXT: br i1 [[ICMP22]], label [[BB6]], label [[LOOP_HEADER]], !prof [[PROF6:![0-9]+]], !llvm.loop [[LOOP7:![0-9]+]] ; CHECK: bb6: ; CHECK-NEXT: ret void ; bb5: - br label %bb15 + br label %loop.header -bb15: ; preds = %bb20, %bb8 - %iv = phi i64 [ 99, %bb5 ], [ %iv.next, %bb20 ] +loop.header: ; preds = %loop.latch, %bb8 + %iv = phi i64 [ 99, %bb5 ], [ %iv.next, %loop.latch ] %and = and i64 %iv, 1 %icmp17 = icmp eq i64 %and, 0 - br i1 %icmp17, label %bb18, label %bb20, !prof !21 + br i1 %icmp17, label %bb18, label %loop.latch, !prof !21 -bb18: ; preds = %bb15 +bb18: ; preds = %loop.header %or = or disjoint i64 %iv, 1 %getelementptr19 = getelementptr inbounds i64, ptr %arr, i64 %or store i64 1, ptr %getelementptr19, align 8 - br label %bb20 + br label %loop.latch -bb20: ; preds = %bb18, %bb15 +loop.latch: ; preds = %bb18, %loop.header %iv.next = add nsw i64 %iv, -1 %icmp22 = icmp eq i64 %iv.next, 90 - br i1 %icmp22, label %bb6, label %bb15, !prof !22 + br i1 %icmp22, label %bb6, label %loop.header, !prof !22 bb6: ret void