| ; RUN: opt -S -passes=rewrite-statepoints-for-gc < %s | FileCheck %s |
| |
| ; This test checks that metadata that's invalid after RS4GC is dropped. |
| ; We can miscompile if optimizations scheduled after RS4GC uses the |
| ; metadata that's infact invalid. |
| |
| declare void @bar() |
| |
| declare void @baz(i32) |
| ; Confirm that loadedval instruction does not contain invariant.load metadata. |
| ; but contains the range metadata. |
| ; Since loadedval is not marked invariant, it will prevent incorrectly sinking |
| ; %loadedval in LICM and avoid creation of an unrelocated use of %baseaddr. |
| define void @test_invariant_load(i1 %c) gc "statepoint-example" { |
| ; CHECK-LABEL: @test_invariant_load |
| ; CHECK: %loadedval = load i32, ptr addrspace(1) %baseaddr, align 8, !range !0 |
| bb: |
| br label %outerloopHdr |
| |
| outerloopHdr: ; preds = %bb6, %bb |
| %baseaddr = phi ptr addrspace(1) [ undef, %bb ], [ %tmp4, %bb6 ] |
| ; LICM may sink this load to exit block after RS4GC because it's tagged invariant. |
| %loadedval = load i32, ptr addrspace(1) %baseaddr, align 8, !range !0, !invariant.load !1 |
| br label %innerloopHdr |
| |
| innerloopHdr: ; preds = %innerlooplatch, %outerloopHdr |
| %tmp4 = phi ptr addrspace(1) [ %baseaddr, %outerloopHdr ], [ %gep, %innerlooplatch ] |
| br label %innermostloophdr |
| |
| innermostloophdr: ; preds = %bb6, %innerloopHdr |
| br i1 %c, label %exitblock, label %bb6 |
| |
| bb6: ; preds = %innermostloophdr |
| switch i32 undef, label %innermostloophdr [ |
| i32 0, label %outerloopHdr |
| i32 1, label %innerlooplatch |
| ] |
| |
| innerlooplatch: ; preds = %bb6 |
| call void @bar() |
| %gep = getelementptr inbounds i32, ptr addrspace(1) %tmp4, i64 8 |
| br label %innerloopHdr |
| |
| exitblock: ; preds = %innermostloophdr |
| %tmp13 = add i32 42, %loadedval |
| call void @baz(i32 %tmp13) |
| unreachable |
| } |
| |
| ; drop the noalias metadata. |
| define void @test_noalias(i32 %x, ptr addrspace(1) %p, ptr addrspace(1) %q) gc "statepoint-example" { |
| ; CHECK-LABEL: test_noalias |
| ; CHECK: %y = load i32, ptr addrspace(1) %q, align 16 |
| ; CHECK: gc.statepoint |
| ; CHECK: %p.relocated |
| ; CHECK-NEXT: store i32 %x, ptr addrspace(1) %p.relocated, align 16 |
| entry: |
| %y = load i32, ptr addrspace(1) %q, align 16, !noalias !5 |
| call void @baz(i32 %x) |
| store i32 %x, ptr addrspace(1) %p, align 16, !noalias !5 |
| ret void |
| } |
| |
| ; drop the dereferenceable metadata |
| define void @test_dereferenceable(ptr addrspace(1) %p, i32 %x, ptr addrspace(1) %q) gc "statepoint-example" { |
| ; CHECK-LABEL: test_dereferenceable |
| ; CHECK: %v1 = load ptr addrspace(1), ptr addrspace(1) %p |
| ; CHECK-NEXT: %v2 = load i32, ptr addrspace(1) %v1 |
| ; CHECK: gc.statepoint |
| %v1 = load ptr addrspace(1), ptr addrspace(1) %p, !dereferenceable !6 |
| %v2 = load i32, ptr addrspace(1) %v1 |
| call void @baz(i32 %x) |
| store i32 %v2, ptr addrspace(1) %q, align 16 |
| ret void |
| } |
| |
| ; invariant.start allows us to sink the load past the baz statepoint call into taken block, which is |
| ; incorrect. remove the invariant.start and RAUW undef. |
| define void @test_inv_start(i1 %cond, ptr addrspace(1) %p, i32 %x, ptr addrspace(1) %q) gc "statepoint-example" { |
| ; CHECK-LABEL: test_inv_start |
| ; CHECK-NOT: invariant.start |
| ; CHECK: gc.statepoint |
| %v1 = load ptr addrspace(1), ptr addrspace(1) %p |
| %invst = call ptr @llvm.invariant.start.p1(i64 1, ptr addrspace(1) %v1) |
| %v2 = load i32, ptr addrspace(1) %v1 |
| call void @baz(i32 %x) |
| br i1 %cond, label %taken, label %untaken |
| |
| taken: |
| store i32 %v2, ptr addrspace(1) %q, align 16 |
| call void @llvm.invariant.end.p1(ptr %invst, i64 4, ptr addrspace(1) %v1) |
| ret void |
| |
| ; CHECK-LABEL: untaken: |
| ; CHECK: gc.statepoint |
| untaken: |
| %foo = call i32 @escaping.invariant.start(ptr %invst) |
| call void @dummy(i32 %foo) |
| ret void |
| } |
| |
| ; invariant.start is removed and the uses are undef'ed. |
| define void @test_inv_start2(i1 %cond, ptr addrspace(1) %p, i32 %x, ptr addrspace(1) %q) gc "statepoint-example" { |
| ; CHECK-LABEL: test_inv_start2 |
| ; CHECK-NOT: invariant.start |
| ; CHECK: gc.statepoint |
| %v1 = load ptr addrspace(1), ptr addrspace(1) %p |
| %invst = call ptr @llvm.invariant.start.p1(i64 1, ptr addrspace(1) %v1) |
| %v2 = load i32, ptr addrspace(1) %v1 |
| call void @baz(i32 %x) |
| br i1 %cond, label %taken, label %untaken |
| |
| taken: |
| store i32 %v2, ptr addrspace(1) %q, align 16 |
| call void @llvm.invariant.end.p1(ptr %invst, i64 4, ptr addrspace(1) %v1) |
| ret void |
| |
| untaken: |
| ret void |
| } |
| declare ptr @llvm.invariant.start.p1(i64, ptr addrspace(1) nocapture) nounwind readonly |
| declare void @llvm.invariant.end.p1(ptr, i64, ptr addrspace(1) nocapture) nounwind |
| declare i32 @escaping.invariant.start(ptr) nounwind |
| declare void @dummy(i32) |
| declare token @llvm.experimental.gc.statepoint.p0(i64, i32, ptr, i32, i32, ...) |
| |
| ; Function Attrs: nounwind readonly |
| declare ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token, i32, i32) #0 |
| |
| |
| attributes #0 = { nounwind readonly } |
| |
| !0 = !{i32 0, i32 2147483647} |
| !1 = !{} |
| !2 = !{i32 10, i32 1} |
| !3 = !{!3} |
| !4 = !{!4, !3} |
| !5 = !{!4} |
| !6 = !{i64 8} |