1 ; RUN: opt -S < %s -jump-threading | FileCheck %s 2 3 ; Keep block addresses alive. 4 @addresses = constant [4 x i8*] [ 5 i8* blockaddress(@test1, %L1), i8* blockaddress(@test1, %L2), 6 i8* blockaddress(@test2, %L1), i8* blockaddress(@test2, %L2) 7 ] 8 9 declare void @bar() 10 declare void @baz() 11 12 13 14 ; Check basic jump threading for indirectbr instructions. 15 16 ; CHECK: void @test1 17 ; CHECK: br i1 %tobool, label %L1, label %indirectgoto 18 ; CHECK-NOT: if.else: 19 ; CHECK: L1: 20 ; CHECK: indirectbr i8* %address, [label %L1, label %L2] 21 define void @test1(i32 %i, i8* %address) nounwind { 22 entry: 23 %rem = srem i32 %i, 2 24 %tobool = icmp ne i32 %rem, 0 25 br i1 %tobool, label %indirectgoto, label %if.else 26 27 if.else: ; preds = %entry 28 br label %indirectgoto 29 30 L1: ; preds = %indirectgoto 31 call void @bar() 32 ret void 33 34 L2: ; preds = %indirectgoto 35 call void @baz() 36 ret void 37 38 indirectgoto: ; preds = %if.else, %entry 39 %indirect.goto.dest = phi i8* [ %address, %if.else ], [ blockaddress(@test1, %L1), %entry ] 40 indirectbr i8* %indirect.goto.dest, [label %L1, label %L2] 41 } 42 43 44 ; Check constant folding of indirectbr 45 46 ; CHECK: void @test2 47 ; CHECK: entry: 48 ; CHECK-NEXT: br label %L1 49 ; CHECK: L1: 50 ; CHECK-NEXT: call void @bar 51 ; CHECK-NEXT: ret void 52 define void @test2() nounwind { 53 entry: 54 indirectbr i8* blockaddress(@test2, %L1), [label %L1, label %L2] 55 56 L1: ; preds = %indirectgoto 57 call void @bar() 58 ret void 59 60 L2: ; preds = %indirectgoto 61 call void @baz() 62 ret void 63 } 64 65 66 ; PR4151 67 ; Don't merge address-taken blocks. 68 @.str = private unnamed_addr constant [4 x i8] c"%p\0A\00" 69 70 ; CHECK: @test3 71 ; CHECK: __here: 72 ; CHECK: blockaddress(@test3, %__here) 73 ; CHECK: __here1: 74 ; CHECK: blockaddress(@test3, %__here1) 75 ; CHECK: __here3: 76 ; CHECK: blockaddress(@test3, %__here3) 77 define void @test3() nounwind ssp noredzone { 78 entry: 79 br label %__here 80 81 __here: ; preds = %entry 82 %call = call i32 (...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i64 0, i64 0), i64 ptrtoint (i8* blockaddress(@test3, %__here) to i64)) nounwind noredzone 83 br label %__here1 84 85 __here1: ; preds = %__here 86 %call2 = call i32 (...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i64 0, i64 0), i64 ptrtoint (i8* blockaddress(@test3, %__here1) to i64)) nounwind noredzone 87 br label %__here3 88 89 __here3: ; preds = %__here1 90 %call4 = call i32 (...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i64 0, i64 0), i64 ptrtoint (i8* blockaddress(@test3, %__here3) to i64)) nounwind noredzone 91 ret void 92 } 93 94 declare i32 @printf(...) noredzone 95
