diff options
Diffstat (limited to 'test/CodeGen/X86/block-placement.ll')
| -rw-r--r-- | test/CodeGen/X86/block-placement.ll | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/test/CodeGen/X86/block-placement.ll b/test/CodeGen/X86/block-placement.ll index 66def49e4b..52f7c3081c 100644 --- a/test/CodeGen/X86/block-placement.ll +++ b/test/CodeGen/X86/block-placement.ll @@ -199,6 +199,44 @@ exit: ret i32 %base } +define void @test_loop_rotate_reversed_blocks() { +; This test case (greatly reduced from an Olden bencmark) ensures that the loop +; rotate implementation doesn't assume that loops are laid out in a particular +; order. The first loop will get split into two basic blocks, with the loop +; header coming after the loop latch. +; +; CHECK: test_loop_rotate_reversed_blocks +; CHECK: %entry +; Look for a jump into the middle of the loop, and no branches mid-way. +; CHECK: jmp +; CHECK: %loop1 +; CHECK-NOT: j{{\w*}} .LBB{{.*}} +; CHECK: %loop1 +; CHECK: je + +entry: + %cond1 = load volatile i1* undef + br i1 %cond1, label %loop2.preheader, label %loop1 + +loop1: + call i32 @f() + %cond2 = load volatile i1* undef + br i1 %cond2, label %loop2.preheader, label %loop1 + +loop2.preheader: + call i32 @f() + %cond3 = load volatile i1* undef + br i1 %cond3, label %exit, label %loop2 + +loop2: + call i32 @f() + %cond4 = load volatile i1* undef + br i1 %cond4, label %exit, label %loop2 + +exit: + ret void +} + define i32 @test_loop_align(i32 %i, i32* %a) { ; Check that we provide basic loop body alignment with the block placement ; pass. @@ -567,8 +605,8 @@ define void @test_unnatural_cfg_backwards_inner_loop() { ; CHECK: test_unnatural_cfg_backwards_inner_loop ; CHECK: %entry ; CHECK: %body -; CHECK: %loop1 ; CHECK: %loop2b +; CHECK: %loop1 ; CHECK: %loop2a entry: |