1 ; RUN: opt < %s -simplifycfg -S | FileCheck %s 2 3 define zeroext i1 @test1(i1 zeroext %flag, i32 %blksA, i32 %blksB, i32 %nblks) { 4 entry: 5 br i1 %flag, label %if.then, label %if.else 6 7 ; CHECK-LABEL: test1 8 ; CHECK: add 9 ; CHECK: select 10 ; CHECK: icmp 11 ; CHECK-NOT: br 12 if.then: 13 %cmp = icmp uge i32 %blksA, %nblks 14 %frombool1 = zext i1 %cmp to i8 15 br label %if.end 16 17 if.else: 18 %add = add i32 %nblks, %blksB 19 %cmp2 = icmp ule i32 %add, %blksA 20 %frombool3 = zext i1 %cmp2 to i8 21 br label %if.end 22 23 if.end: 24 %obeys.0 = phi i8 [ %frombool1, %if.then ], [ %frombool3, %if.else ] 25 %tobool4 = icmp ne i8 %obeys.0, 0 26 ret i1 %tobool4 27 } 28 29 define zeroext i1 @test2(i1 zeroext %flag, i32 %blksA, i32 %blksB, i32 %nblks) { 30 entry: 31 br i1 %flag, label %if.then, label %if.else 32 33 ; CHECK-LABEL: test2 34 ; CHECK: add 35 ; CHECK: select 36 ; CHECK: icmp 37 ; CHECK-NOT: br 38 if.then: 39 %cmp = icmp uge i32 %blksA, %nblks 40 %frombool1 = zext i1 %cmp to i8 41 br label %if.end 42 43 if.else: 44 %add = add i32 %nblks, %blksB 45 %cmp2 = icmp uge i32 %blksA, %add 46 %frombool3 = zext i1 %cmp2 to i8 47 br label %if.end 48 49 if.end: 50 %obeys.0 = phi i8 [ %frombool1, %if.then ], [ %frombool3, %if.else ] 51 %tobool4 = icmp ne i8 %obeys.0, 0 52 ret i1 %tobool4 53 } 54 55 declare i32 @foo(i32, i32) nounwind readnone 56 57 define i32 @test3(i1 zeroext %flag, i32 %x, i32 %y) { 58 entry: 59 br i1 %flag, label %if.then, label %if.else 60 61 if.then: 62 %x0 = call i32 @foo(i32 %x, i32 0) nounwind readnone 63 %y0 = call i32 @foo(i32 %x, i32 1) nounwind readnone 64 br label %if.end 65 66 if.else: 67 %x1 = call i32 @foo(i32 %y, i32 0) nounwind readnone 68 %y1 = call i32 @foo(i32 %y, i32 1) nounwind readnone 69 br label %if.end 70 71 if.end: 72 %xx = phi i32 [ %x0, %if.then ], [ %x1, %if.else ] 73 %yy = phi i32 [ %y0, %if.then ], [ %y1, %if.else ] 74 %ret = add i32 %xx, %yy 75 ret i32 %ret 76 } 77 78 ; CHECK-LABEL: test3 79 ; CHECK: select 80 ; CHECK: call 81 ; CHECK: call 82 ; CHECK: add 83 ; CHECK-NOT: br 84
