| ; RUN: opt < %s -scalar-evolution -analyze -enable-new-pm=0 | FileCheck %s |
| ; RUN: opt < %s "-passes=print<scalar-evolution>" -disable-output 2>&1 | FileCheck %s |
| |
| ; One side exit dominating the latch, exact backedge taken count is known. |
| define void @test_01() { |
| |
| ; CHECK-LABEL: Determining loop execution counts for: @test_01 |
| ; CHECK-NEXT: Loop %loop: <multiple exits> backedge-taken count is 50 |
| |
| entry: |
| br label %loop |
| |
| loop: |
| %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ] |
| %side.cond = icmp slt i32 %iv, 50 |
| br i1 %side.cond, label %backedge, label %side.exit |
| |
| backedge: |
| %iv.next = add i32 %iv, 1 |
| %loop.cond = icmp slt i32 %iv, 100 |
| br i1 %loop.cond, label %loop, label %exit |
| |
| exit: |
| ret void |
| |
| side.exit: |
| ret void |
| } |
| |
| define void @test_02(i1 %c) { |
| |
| ; CHECK-LABEL: Determining loop execution counts for: @test_02 |
| ; CHECK-NEXT: Loop %loop: <multiple exits> backedge-taken count is 50 |
| |
| entry: |
| br label %loop |
| |
| loop: |
| %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ] |
| br i1 %c, label %if.true, label %if.false |
| |
| if.true: |
| br label %merge |
| |
| if.false: |
| br label %merge |
| |
| merge: |
| %side.cond = icmp slt i32 %iv, 50 |
| br i1 %side.cond, label %backedge, label %side.exit |
| |
| backedge: |
| %iv.next = add i32 %iv, 1 |
| %loop.cond = icmp slt i32 %iv, 100 |
| br i1 %loop.cond, label %loop, label %exit |
| |
| exit: |
| ret void |
| |
| side.exit: |
| ret void |
| } |