1 ; RUN: opt %s -rewrite-statepoints-for-gc -S 2>&1 | FileCheck %s 2 3 declare i64 addrspace(1)* @generate_obj() 4 declare void @use_obj(i64 addrspace(1)*) 5 6 ; The rewriting needs to make %obj loop variant by inserting a phi 7 ; of the original value and it's relocation. 8 define void @def_use_safepoint() gc "statepoint-example" { 9 ; CHECK-LABEL: def_use_safepoint 10 entry: 11 %obj = call i64 addrspace(1)* @generate_obj() 12 br label %loop 13 14 loop: 15 ; CHECK: phi i64 addrspace(1)* 16 ; CHECK-DAG: [ %obj.relocated, %loop ] 17 ; CHECK-DAG: [ %obj, %entry ] 18 call void @use_obj(i64 addrspace(1)* %obj) 19 %safepoint_token = call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @do_safepoint, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0) 20 br label %loop 21 } 22 23 declare void @do_safepoint() 24 25 declare void @parse_point(i64 addrspace(1)*) 26 27 define i64 addrspace(1)* @test1(i32 %caller, i8 addrspace(1)* %a, i8 addrspace(1)* %b, i32 %unknown) gc "statepoint-example" { 28 ; CHECK-LABEL: test1 29 entry: 30 br i1 undef, label %left, label %right 31 32 left: 33 %a.cast = bitcast i8 addrspace(1)* %a to i64 addrspace(1)* 34 ; CHECK: left: 35 ; CHECK-NEXT: %a.cast = bitcast i8 addrspace(1)* %a to i64 addrspace(1)* 36 ; CHECK-NEXT: [[CAST_L:%.*]] = bitcast i8 addrspace(1)* %a to i64 addrspace(1)* 37 38 ; Our safepoint placement pass calls removeUnreachableBlocks, which does a bunch 39 ; of simplifications to branch instructions. This bug is visible only when 40 ; there are multiple branches into the same block from the same predecessor, and 41 ; the following ceremony is to make that artefact survive a call to 42 ; removeUnreachableBlocks. As an example, "br i1 undef, label %merge, label %merge" 43 ; will get simplified to "br label %merge" by removeUnreachableBlocks. 44 switch i32 %unknown, label %right [ i32 0, label %merge 45 i32 1, label %merge 46 i32 5, label %merge 47 i32 3, label %right ] 48 49 right: 50 %b.cast = bitcast i8 addrspace(1)* %b to i64 addrspace(1)* 51 br label %merge 52 ; CHECK: right: 53 ; CHECK-NEXT: %b.cast = bitcast i8 addrspace(1)* %b to i64 addrspace(1)* 54 ; CHECK-NEXT: [[CAST_R:%.*]] = bitcast i8 addrspace(1)* %b to i64 addrspace(1)* 55 56 merge: 57 ; CHECK: merge: 58 ; CHECK-NEXT: %base_phi = phi i64 addrspace(1)* [ [[CAST_L]], %left ], [ [[CAST_L]], %left ], [ [[CAST_L]], %left ], [ [[CAST_R]], %right ], !is_base_value !0 59 %value = phi i64 addrspace(1)* [ %a.cast, %left], [ %a.cast, %left], [ %a.cast, %left], [ %b.cast, %right] 60 %safepoint_token = call i32 (void (i64 addrspace(1)*)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(void (i64 addrspace(1)*)* @parse_point, i32 1, i32 0, i64 addrspace(1)* %value, i32 5, i32 0, i32 0, i32 0, i32 0, i32 0) 61 62 ret i64 addrspace(1)* %value 63 } 64 65 ;; The purpose of this test is to ensure that when two live values share a 66 ;; base defining value with inherent conflicts, we end up with a *single* 67 ;; base phi/select per such node. This is testing an optimization, not a 68 ;; fundemental correctness criteria 69 define void @test2(i1 %cnd, i64 addrspace(1)* %base_obj, i64 addrspace(1)* %base_arg2) gc "statepoint-example" { 70 ; CHECK-LABEL: @test2 71 entry: 72 %obj = getelementptr i64, i64 addrspace(1)* %base_obj, i32 1 73 br label %loop 74 75 loop: ; preds = %loop, %entry 76 ; CHECK-LABEL: loop 77 ; CHECK: %base_phi = phi i64 addrspace(1)* 78 ; CHECK-DAG: [ %base_obj, %entry ] 79 ; Given the two selects are equivelent, so are their base phis - ideally, 80 ; we'd have commoned these, but that's a missed optimization, not correctness. 81 ; CHECK-DAG: [ [[DISCARD:%base_select.*.relocated]], %loop ] 82 ; CHECK-NOT: base_phi2 83 ; CHECK: next = select 84 ; CHECK: base_select 85 ; CHECK: extra2 = select 86 ; CHECK: base_select 87 ; CHECK: statepoint 88 ;; Both 'next' and 'extra2' are live across the backedge safepoint... 89 %current = phi i64 addrspace(1)* [ %obj, %entry ], [ %next, %loop ] 90 %extra = phi i64 addrspace(1)* [ %obj, %entry ], [ %extra2, %loop ] 91 %nexta = getelementptr i64, i64 addrspace(1)* %current, i32 1 92 %next = select i1 %cnd, i64 addrspace(1)* %nexta, i64 addrspace(1)* %base_arg2 93 %extra2 = select i1 %cnd, i64 addrspace(1)* %nexta, i64 addrspace(1)* %base_arg2 94 %safepoint_token = call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0) 95 br label %loop 96 } 97 98 declare void @foo() 99 declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()*, i32, i32, ...) 100 declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(void (i64 addrspace(1)*)*, i32, i32, ...) 101
