diff options
Diffstat (limited to 'test/CodeGen/X86/block-placement.ll')
| -rw-r--r-- | test/CodeGen/X86/block-placement.ll | 542 |
1 files changed, 540 insertions, 2 deletions
diff --git a/test/CodeGen/X86/block-placement.ll b/test/CodeGen/X86/block-placement.ll index e41d52c..f87d1a6 100644 --- a/test/CodeGen/X86/block-placement.ll +++ b/test/CodeGen/X86/block-placement.ll @@ -1,4 +1,4 @@ -; RUN: llc -march=x86 -enable-block-placement < %s | FileCheck %s +; RUN: llc -mtriple=i686-linux -enable-block-placement < %s | FileCheck %s declare void @error(i32 %i, i32 %a, i32 %b) @@ -241,8 +241,8 @@ define void @unnatural_cfg1() { ; CHECK: unnatural_cfg1 ; CHECK: %entry ; CHECK: %loop.body1 -; CHECK: %loop.body3 ; CHECK: %loop.body2 +; CHECK: %loop.body3 entry: br label %loop.header @@ -272,6 +272,77 @@ loop.body5: br label %loop.body3 } +define void @unnatural_cfg2() { +; Test that we can handle a loop with a nested natural loop *and* an unnatural +; loop. This was reduced from a crash on block placement when run over +; single-source GCC. +; CHECK: unnatural_cfg2 +; CHECK: %entry +; CHECK: %loop.header +; CHECK: %loop.body1 +; CHECK: %loop.body2 +; CHECK: %loop.body3 +; CHECK: %loop.inner1.begin +; The end block is folded with %loop.body3... +; CHECK-NOT: %loop.inner1.end +; CHECK: %loop.body4 +; CHECK: %loop.inner2.begin +; The loop.inner2.end block is folded +; CHECK: %bail + +entry: + br label %loop.header + +loop.header: + %comp0 = icmp eq i32* undef, null + br i1 %comp0, label %bail, label %loop.body1 + +loop.body1: + %val0 = load i32** undef, align 4 + br i1 undef, label %loop.body2, label %loop.inner1.begin + +loop.body2: + br i1 undef, label %loop.body4, label %loop.body3 + +loop.body3: + %ptr1 = getelementptr inbounds i32* %val0, i32 0 + %castptr1 = bitcast i32* %ptr1 to i32** + %val1 = load i32** %castptr1, align 4 + br label %loop.inner1.begin + +loop.inner1.begin: + %valphi = phi i32* [ %val2, %loop.inner1.end ], [ %val1, %loop.body3 ], [ %val0, %loop.body1 ] + %castval = bitcast i32* %valphi to i32* + %comp1 = icmp eq i32 undef, 48 + br i1 %comp1, label %loop.inner1.end, label %loop.body4 + +loop.inner1.end: + %ptr2 = getelementptr inbounds i32* %valphi, i32 0 + %castptr2 = bitcast i32* %ptr2 to i32** + %val2 = load i32** %castptr2, align 4 + br label %loop.inner1.begin + +loop.body4.dead: + br label %loop.body4 + +loop.body4: + %comp2 = icmp ult i32 undef, 3 + br i1 %comp2, label %loop.inner2.begin, label %loop.end + +loop.inner2.begin: + br i1 false, label %loop.end, label %loop.inner2.end + +loop.inner2.end: + %comp3 = icmp eq i32 undef, 1769472 + br i1 %comp3, label %loop.end, label %loop.inner2.begin + +loop.end: + br label %loop.header + +bail: + unreachable +} + define i32 @problematic_switch() { ; This function's CFG caused overlow in the machine branch probability ; calculation, triggering asserts. Make sure we don't crash on it. @@ -322,3 +393,470 @@ exit: %merge = phi i32 [ 3, %step ], [ 6, %entry ] ret i32 %merge } + +define void @fpcmp_unanalyzable_branch(i1 %cond) { +; This function's CFG contains an unanalyzable branch that is likely to be +; split due to having a different high-probability predecessor. +; CHECK: fpcmp_unanalyzable_branch +; CHECK: %entry +; CHECK: %exit +; CHECK-NOT: %if.then +; CHECK-NOT: %if.end +; CHECK-NOT: jne +; CHECK-NOT: jnp +; CHECK: jne +; CHECK-NEXT: jnp +; CHECK-NEXT: %if.then + +entry: +; Note that this branch must be strongly biased toward +; 'entry.if.then_crit_edge' to ensure that we would try to form a chain for +; 'entry' -> 'entry.if.then_crit_edge' -> 'if.then'. It is the last edge in that +; chain which would violate the unanalyzable branch in 'exit', but we won't even +; try this trick unless 'if.then' is believed to almost always be reached from +; 'entry.if.then_crit_edge'. + br i1 %cond, label %entry.if.then_crit_edge, label %lor.lhs.false, !prof !1 + +entry.if.then_crit_edge: + %.pre14 = load i8* undef, align 1, !tbaa !0 + br label %if.then + +lor.lhs.false: + br i1 undef, label %if.end, label %exit + +exit: + %cmp.i = fcmp une double 0.000000e+00, undef + br i1 %cmp.i, label %if.then, label %if.end + +if.then: + %0 = phi i8 [ %.pre14, %entry.if.then_crit_edge ], [ undef, %exit ] + %1 = and i8 %0, 1 + store i8 %1, i8* undef, align 4, !tbaa !0 + br label %if.end + +if.end: + ret void +} + +!1 = metadata !{metadata !"branch_weights", i32 1000, i32 1} + +declare i32 @f() +declare i32 @g() +declare i32 @h(i32 %x) + +define i32 @test_global_cfg_break_profitability() { +; Check that our metrics for the profitability of a CFG break are global rather +; than local. A successor may be very hot, but if the current block isn't, it +; doesn't matter. Within this test the 'then' block is slightly warmer than the +; 'else' block, but not nearly enough to merit merging it with the exit block +; even though the probability of 'then' branching to the 'exit' block is very +; high. +; CHECK: test_global_cfg_break_profitability +; CHECK: calll {{_?}}f +; CHECK: calll {{_?}}g +; CHECK: calll {{_?}}h +; CHECK: ret + +entry: + br i1 undef, label %then, label %else, !prof !2 + +then: + %then.result = call i32 @f() + br label %exit + +else: + %else.result = call i32 @g() + br label %exit + +exit: + %result = phi i32 [ %then.result, %then ], [ %else.result, %else ] + %result2 = call i32 @h(i32 %result) + ret i32 %result +} + +!2 = metadata !{metadata !"branch_weights", i32 3, i32 1} + +declare i32 @__gxx_personality_v0(...) + +define void @test_eh_lpad_successor() { +; Some times the landing pad ends up as the first successor of an invoke block. +; When this happens, a strange result used to fall out of updateTerminators: we +; didn't correctly locate the fallthrough successor, assuming blindly that the +; first one was the fallthrough successor. As a result, we would add an +; erroneous jump to the landing pad thinking *that* was the default successor. +; CHECK: test_eh_lpad_successor +; CHECK: %entry +; CHECK-NOT: jmp +; CHECK: %loop + +entry: + invoke i32 @f() to label %preheader unwind label %lpad + +preheader: + br label %loop + +lpad: + %lpad.val = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) + cleanup + resume { i8*, i32 } %lpad.val + +loop: + br label %loop +} + +declare void @fake_throw() noreturn + +define void @test_eh_throw() { +; For blocks containing a 'throw' (or similar functionality), we have +; a no-return invoke. In this case, only EH successors will exist, and +; fallthrough simply won't occur. Make sure we don't crash trying to update +; terminators for such constructs. +; +; CHECK: test_eh_throw +; CHECK: %entry +; CHECK: %cleanup + +entry: + invoke void @fake_throw() to label %continue unwind label %cleanup + +continue: + unreachable + +cleanup: + %0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) + cleanup + unreachable +} + +define void @test_unnatural_cfg_backwards_inner_loop() { +; Test that when we encounter an unnatural CFG structure after having formed +; a chain for an inner loop which happened to be laid out backwards we don't +; attempt to merge onto the wrong end of the inner loop just because we find it +; first. This was reduced from a crasher in GCC's single source. +; +; CHECK: test_unnatural_cfg_backwards_inner_loop +; CHECK: %entry +; CHECK: %body +; CHECK: %loop1 +; CHECK: %loop2b +; CHECK: %loop2a + +entry: + br i1 undef, label %loop2a, label %body + +body: + br label %loop2a + +loop1: + %next.load = load i32** undef + br i1 %comp.a, label %loop2a, label %loop2b + +loop2a: + %var = phi i32* [ null, %entry ], [ null, %body ], [ %next.phi, %loop1 ] + %next.var = phi i32* [ null, %entry ], [ undef, %body ], [ %next.load, %loop1 ] + %comp.a = icmp eq i32* %var, null + br label %loop3 + +loop2b: + %gep = getelementptr inbounds i32* %var.phi, i32 0 + %next.ptr = bitcast i32* %gep to i32** + store i32* %next.phi, i32** %next.ptr + br label %loop3 + +loop3: + %var.phi = phi i32* [ %next.phi, %loop2b ], [ %var, %loop2a ] + %next.phi = phi i32* [ %next.load, %loop2b ], [ %next.var, %loop2a ] + br label %loop1 +} + +define void @unanalyzable_branch_to_loop_header() { +; Ensure that we can handle unanalyzable branches into loop headers. We +; pre-form chains for unanalyzable branches, and will find the tail end of that +; at the start of the loop. This function uses floating point comparison +; fallthrough because that happens to always produce unanalyzable branches on +; x86. +; +; CHECK: unanalyzable_branch_to_loop_header +; CHECK: %entry +; CHECK: %loop +; CHECK: %exit + +entry: + %cmp = fcmp une double 0.000000e+00, undef + br i1 %cmp, label %loop, label %exit + +loop: + %cond = icmp eq i8 undef, 42 + br i1 %cond, label %exit, label %loop + +exit: + ret void +} + +define void @unanalyzable_branch_to_best_succ(i1 %cond) { +; Ensure that we can handle unanalyzable branches where the destination block +; gets selected as the optimal sucessor to merge. +; +; CHECK: unanalyzable_branch_to_best_succ +; CHECK: %entry +; CHECK: %foo +; CHECK: %bar +; CHECK: %exit + +entry: + ; Bias this branch toward bar to ensure we form that chain. + br i1 %cond, label %bar, label %foo, !prof !1 + +foo: + %cmp = fcmp une double 0.000000e+00, undef + br i1 %cmp, label %bar, label %exit + +bar: + call i32 @f() + br label %exit + +exit: + ret void +} + +define void @unanalyzable_branch_to_free_block(float %x) { +; Ensure that we can handle unanalyzable branches where the destination block +; gets selected as the best free block in the CFG. +; +; CHECK: unanalyzable_branch_to_free_block +; CHECK: %entry +; CHECK: %a +; CHECK: %b +; CHECK: %c +; CHECK: %exit + +entry: + br i1 undef, label %a, label %b + +a: + call i32 @f() + br label %c + +b: + %cmp = fcmp une float %x, undef + br i1 %cmp, label %c, label %exit + +c: + call i32 @g() + br label %exit + +exit: + ret void +} + +define void @many_unanalyzable_branches() { +; Ensure that we don't crash as we're building up many unanalyzable branches, +; blocks, and loops. +; +; CHECK: many_unanalyzable_branches +; CHECK: %entry +; CHECK: %exit + +entry: + br label %0 + + %val0 = volatile load float* undef + %cmp0 = fcmp une float %val0, undef + br i1 %cmp0, label %1, label %0 + %val1 = volatile load float* undef + %cmp1 = fcmp une float %val1, undef + br i1 %cmp1, label %2, label %1 + %val2 = volatile load float* undef + %cmp2 = fcmp une float %val2, undef + br i1 %cmp2, label %3, label %2 + %val3 = volatile load float* undef + %cmp3 = fcmp une float %val3, undef + br i1 %cmp3, label %4, label %3 + %val4 = volatile load float* undef + %cmp4 = fcmp une float %val4, undef + br i1 %cmp4, label %5, label %4 + %val5 = volatile load float* undef + %cmp5 = fcmp une float %val5, undef + br i1 %cmp5, label %6, label %5 + %val6 = volatile load float* undef + %cmp6 = fcmp une float %val6, undef + br i1 %cmp6, label %7, label %6 + %val7 = volatile load float* undef + %cmp7 = fcmp une float %val7, undef + br i1 %cmp7, label %8, label %7 + %val8 = volatile load float* undef + %cmp8 = fcmp une float %val8, undef + br i1 %cmp8, label %9, label %8 + %val9 = volatile load float* undef + %cmp9 = fcmp une float %val9, undef + br i1 %cmp9, label %10, label %9 + %val10 = volatile load float* undef + %cmp10 = fcmp une float %val10, undef + br i1 %cmp10, label %11, label %10 + %val11 = volatile load float* undef + %cmp11 = fcmp une float %val11, undef + br i1 %cmp11, label %12, label %11 + %val12 = volatile load float* undef + %cmp12 = fcmp une float %val12, undef + br i1 %cmp12, label %13, label %12 + %val13 = volatile load float* undef + %cmp13 = fcmp une float %val13, undef + br i1 %cmp13, label %14, label %13 + %val14 = volatile load float* undef + %cmp14 = fcmp une float %val14, undef + br i1 %cmp14, label %15, label %14 + %val15 = volatile load float* undef + %cmp15 = fcmp une float %val15, undef + br i1 %cmp15, label %16, label %15 + %val16 = volatile load float* undef + %cmp16 = fcmp une float %val16, undef + br i1 %cmp16, label %17, label %16 + %val17 = volatile load float* undef + %cmp17 = fcmp une float %val17, undef + br i1 %cmp17, label %18, label %17 + %val18 = volatile load float* undef + %cmp18 = fcmp une float %val18, undef + br i1 %cmp18, label %19, label %18 + %val19 = volatile load float* undef + %cmp19 = fcmp une float %val19, undef + br i1 %cmp19, label %20, label %19 + %val20 = volatile load float* undef + %cmp20 = fcmp une float %val20, undef + br i1 %cmp20, label %21, label %20 + %val21 = volatile load float* undef + %cmp21 = fcmp une float %val21, undef + br i1 %cmp21, label %22, label %21 + %val22 = volatile load float* undef + %cmp22 = fcmp une float %val22, undef + br i1 %cmp22, label %23, label %22 + %val23 = volatile load float* undef + %cmp23 = fcmp une float %val23, undef + br i1 %cmp23, label %24, label %23 + %val24 = volatile load float* undef + %cmp24 = fcmp une float %val24, undef + br i1 %cmp24, label %25, label %24 + %val25 = volatile load float* undef + %cmp25 = fcmp une float %val25, undef + br i1 %cmp25, label %26, label %25 + %val26 = volatile load float* undef + %cmp26 = fcmp une float %val26, undef + br i1 %cmp26, label %27, label %26 + %val27 = volatile load float* undef + %cmp27 = fcmp une float %val27, undef + br i1 %cmp27, label %28, label %27 + %val28 = volatile load float* undef + %cmp28 = fcmp une float %val28, undef + br i1 %cmp28, label %29, label %28 + %val29 = volatile load float* undef + %cmp29 = fcmp une float %val29, undef + br i1 %cmp29, label %30, label %29 + %val30 = volatile load float* undef + %cmp30 = fcmp une float %val30, undef + br i1 %cmp30, label %31, label %30 + %val31 = volatile load float* undef + %cmp31 = fcmp une float %val31, undef + br i1 %cmp31, label %32, label %31 + %val32 = volatile load float* undef + %cmp32 = fcmp une float %val32, undef + br i1 %cmp32, label %33, label %32 + %val33 = volatile load float* undef + %cmp33 = fcmp une float %val33, undef + br i1 %cmp33, label %34, label %33 + %val34 = volatile load float* undef + %cmp34 = fcmp une float %val34, undef + br i1 %cmp34, label %35, label %34 + %val35 = volatile load float* undef + %cmp35 = fcmp une float %val35, undef + br i1 %cmp35, label %36, label %35 + %val36 = volatile load float* undef + %cmp36 = fcmp une float %val36, undef + br i1 %cmp36, label %37, label %36 + %val37 = volatile load float* undef + %cmp37 = fcmp une float %val37, undef + br i1 %cmp37, label %38, label %37 + %val38 = volatile load float* undef + %cmp38 = fcmp une float %val38, undef + br i1 %cmp38, label %39, label %38 + %val39 = volatile load float* undef + %cmp39 = fcmp une float %val39, undef + br i1 %cmp39, label %40, label %39 + %val40 = volatile load float* undef + %cmp40 = fcmp une float %val40, undef + br i1 %cmp40, label %41, label %40 + %val41 = volatile load float* undef + %cmp41 = fcmp une float %val41, undef + br i1 %cmp41, label %42, label %41 + %val42 = volatile load float* undef + %cmp42 = fcmp une float %val42, undef + br i1 %cmp42, label %43, label %42 + %val43 = volatile load float* undef + %cmp43 = fcmp une float %val43, undef + br i1 %cmp43, label %44, label %43 + %val44 = volatile load float* undef + %cmp44 = fcmp une float %val44, undef + br i1 %cmp44, label %45, label %44 + %val45 = volatile load float* undef + %cmp45 = fcmp une float %val45, undef + br i1 %cmp45, label %46, label %45 + %val46 = volatile load float* undef + %cmp46 = fcmp une float %val46, undef + br i1 %cmp46, label %47, label %46 + %val47 = volatile load float* undef + %cmp47 = fcmp une float %val47, undef + br i1 %cmp47, label %48, label %47 + %val48 = volatile load float* undef + %cmp48 = fcmp une float %val48, undef + br i1 %cmp48, label %49, label %48 + %val49 = volatile load float* undef + %cmp49 = fcmp une float %val49, undef + br i1 %cmp49, label %50, label %49 + %val50 = volatile load float* undef + %cmp50 = fcmp une float %val50, undef + br i1 %cmp50, label %51, label %50 + %val51 = volatile load float* undef + %cmp51 = fcmp une float %val51, undef + br i1 %cmp51, label %52, label %51 + %val52 = volatile load float* undef + %cmp52 = fcmp une float %val52, undef + br i1 %cmp52, label %53, label %52 + %val53 = volatile load float* undef + %cmp53 = fcmp une float %val53, undef + br i1 %cmp53, label %54, label %53 + %val54 = volatile load float* undef + %cmp54 = fcmp une float %val54, undef + br i1 %cmp54, label %55, label %54 + %val55 = volatile load float* undef + %cmp55 = fcmp une float %val55, undef + br i1 %cmp55, label %56, label %55 + %val56 = volatile load float* undef + %cmp56 = fcmp une float %val56, undef + br i1 %cmp56, label %57, label %56 + %val57 = volatile load float* undef + %cmp57 = fcmp une float %val57, undef + br i1 %cmp57, label %58, label %57 + %val58 = volatile load float* undef + %cmp58 = fcmp une float %val58, undef + br i1 %cmp58, label %59, label %58 + %val59 = volatile load float* undef + %cmp59 = fcmp une float %val59, undef + br i1 %cmp59, label %60, label %59 + %val60 = volatile load float* undef + %cmp60 = fcmp une float %val60, undef + br i1 %cmp60, label %61, label %60 + %val61 = volatile load float* undef + %cmp61 = fcmp une float %val61, undef + br i1 %cmp61, label %62, label %61 + %val62 = volatile load float* undef + %cmp62 = fcmp une float %val62, undef + br i1 %cmp62, label %63, label %62 + %val63 = volatile load float* undef + %cmp63 = fcmp une float %val63, undef + br i1 %cmp63, label %64, label %63 + %val64 = volatile load float* undef + %cmp64 = fcmp une float %val64, undef + br i1 %cmp64, label %65, label %64 + + br label %exit +exit: + ret void +} |