| ; RUN: opt < %s -simplifycfg -S | FileCheck %s |
| |
| define zeroext i1 @test1(i1 zeroext %flag, i32 %blksA, i32 %blksB, i32 %nblks) { |
| entry: |
| br i1 %flag, label %if.then, label %if.else |
| |
| ; CHECK-LABEL: test1 |
| ; CHECK: add |
| ; CHECK: select |
| ; CHECK: icmp |
| ; CHECK-NOT: br |
| if.then: |
| %cmp = icmp uge i32 %blksA, %nblks |
| %frombool1 = zext i1 %cmp to i8 |
| br label %if.end |
| |
| if.else: |
| %add = add i32 %nblks, %blksB |
| %cmp2 = icmp ule i32 %add, %blksA |
| %frombool3 = zext i1 %cmp2 to i8 |
| br label %if.end |
| |
| if.end: |
| %obeys.0 = phi i8 [ %frombool1, %if.then ], [ %frombool3, %if.else ] |
| %tobool4 = icmp ne i8 %obeys.0, 0 |
| ret i1 %tobool4 |
| } |
| |
| define zeroext i1 @test2(i1 zeroext %flag, i32 %blksA, i32 %blksB, i32 %nblks) { |
| entry: |
| br i1 %flag, label %if.then, label %if.else |
| |
| ; CHECK-LABEL: test2 |
| ; CHECK: add |
| ; CHECK: select |
| ; CHECK: icmp |
| ; CHECK-NOT: br |
| if.then: |
| %cmp = icmp uge i32 %blksA, %nblks |
| %frombool1 = zext i1 %cmp to i8 |
| br label %if.end |
| |
| if.else: |
| %add = add i32 %nblks, %blksB |
| %cmp2 = icmp uge i32 %blksA, %add |
| %frombool3 = zext i1 %cmp2 to i8 |
| br label %if.end |
| |
| if.end: |
| %obeys.0 = phi i8 [ %frombool1, %if.then ], [ %frombool3, %if.else ] |
| %tobool4 = icmp ne i8 %obeys.0, 0 |
| ret i1 %tobool4 |
| } |
| |
| declare i32 @foo(i32, i32) nounwind readnone |
| |
| define i32 @test3(i1 zeroext %flag, i32 %x, i32 %y) { |
| entry: |
| br i1 %flag, label %if.then, label %if.else |
| |
| if.then: |
| %x0 = call i32 @foo(i32 %x, i32 0) nounwind readnone |
| %y0 = call i32 @foo(i32 %x, i32 1) nounwind readnone |
| br label %if.end |
| |
| if.else: |
| %x1 = call i32 @foo(i32 %y, i32 0) nounwind readnone |
| %y1 = call i32 @foo(i32 %y, i32 1) nounwind readnone |
| br label %if.end |
| |
| if.end: |
| %xx = phi i32 [ %x0, %if.then ], [ %x1, %if.else ] |
| %yy = phi i32 [ %y0, %if.then ], [ %y1, %if.else ] |
| %ret = add i32 %xx, %yy |
| ret i32 %ret |
| } |
| |
| ; CHECK-LABEL: test3 |
| ; CHECK: select |
| ; CHECK: call |
| ; CHECK: call |
| ; CHECK: add |
| ; CHECK-NOT: br |