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llvm-6502/test/CodeGen/X86/block-placement.ll
Chandler Carruth 9e67db4af1 Flip the new block-placement pass to be on by default. 
This is mostly to test the waters. I'd like to get results from FNT
build bots and other bots running on non-x86 platforms.

This feature has been pretty heavily tested over the last few months by
me, and it fixes several of the execution time regressions caused by the
inlining work by preventing inlining decisions from radically impacting
block layout.

I've seen very large improvements in yacr2 and ackermann benchmarks,
along with the expected noise across all of the benchmark suite whenever
code layout changes. I've analyzed all of the regressions and fixed
them, or found them to be impossible to fix. See my email to llvmdev for
more details.

I'd like for this to be in 3.1 as it complements the inliner changes,
but if any failures are showing up or anyone has concerns, it is just
a flag flip and so can be easily turned off.

I'm switching it on tonight to try and get at least one run through
various folks' performance suites in case SPEC or something else has
serious issues with it. I'll watch bots and revert if anything shows up.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154816 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-16 13:49:17 +00:00

1084 lines
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; RUN: llc -mtriple=i686-linux < %s | FileCheck %s
declare void @error(i32 %i, i32 %a, i32 %b)
define i32 @test_ifchains(i32 %i, i32* %a, i32 %b) {
; Test a chain of ifs, where the block guarded by the if is error handling code
; that is not expected to run.
; CHECK: test_ifchains:
; CHECK: %entry
; CHECK: %else1
; CHECK: %else2
; CHECK: %else3
; CHECK: %else4
; CHECK: %exit
; CHECK: %then1
; CHECK: %then2
; CHECK: %then3
; CHECK: %then4
; CHECK: %then5
entry:
%gep1 = getelementptr i32* %a, i32 1
%val1 = load i32* %gep1
%cond1 = icmp ugt i32 %val1, 1
br i1 %cond1, label %then1, label %else1, !prof !0
then1:
call void @error(i32 %i, i32 1, i32 %b)
br label %else1
else1:
%gep2 = getelementptr i32* %a, i32 2
%val2 = load i32* %gep2
%cond2 = icmp ugt i32 %val2, 2
br i1 %cond2, label %then2, label %else2, !prof !0
then2:
call void @error(i32 %i, i32 1, i32 %b)
br label %else2
else2:
%gep3 = getelementptr i32* %a, i32 3
%val3 = load i32* %gep3
%cond3 = icmp ugt i32 %val3, 3
br i1 %cond3, label %then3, label %else3, !prof !0
then3:
call void @error(i32 %i, i32 1, i32 %b)
br label %else3
else3:
%gep4 = getelementptr i32* %a, i32 4
%val4 = load i32* %gep4
%cond4 = icmp ugt i32 %val4, 4
br i1 %cond4, label %then4, label %else4, !prof !0
then4:
call void @error(i32 %i, i32 1, i32 %b)
br label %else4
else4:
%gep5 = getelementptr i32* %a, i32 3
%val5 = load i32* %gep5
%cond5 = icmp ugt i32 %val5, 3
br i1 %cond5, label %then5, label %exit, !prof !0
then5:
call void @error(i32 %i, i32 1, i32 %b)
br label %exit
exit:
ret i32 %b
}
define i32 @test_loop_cold_blocks(i32 %i, i32* %a) {
; Check that we sink cold loop blocks after the hot loop body.
; CHECK: test_loop_cold_blocks:
; CHECK: %entry
; CHECK: %unlikely1
; CHECK: %unlikely2
; CHECK: %body1
; CHECK: %body2
; CHECK: %body3
; CHECK: %exit
entry:
br label %body1
body1:
%iv = phi i32 [ 0, %entry ], [ %next, %body3 ]
%base = phi i32 [ 0, %entry ], [ %sum, %body3 ]
%unlikelycond1 = icmp slt i32 %base, 42
br i1 %unlikelycond1, label %unlikely1, label %body2, !prof !0
unlikely1:
call void @error(i32 %i, i32 1, i32 %base)
br label %body2
body2:
%unlikelycond2 = icmp sgt i32 %base, 21
br i1 %unlikelycond2, label %unlikely2, label %body3, !prof !0
unlikely2:
call void @error(i32 %i, i32 2, i32 %base)
br label %body3
body3:
%arrayidx = getelementptr inbounds i32* %a, i32 %iv
%0 = load i32* %arrayidx
%sum = add nsw i32 %0, %base
%next = add i32 %iv, 1
%exitcond = icmp eq i32 %next, %i
br i1 %exitcond, label %exit, label %body1
exit:
ret i32 %sum
}
!0 = metadata !{metadata !"branch_weights", i32 4, i32 64}
define i32 @test_loop_early_exits(i32 %i, i32* %a) {
; Check that we sink early exit blocks out of loop bodies.
; CHECK: test_loop_early_exits:
; CHECK: %entry
; CHECK: %body1
; CHECK: %body2
; CHECK: %body3
; CHECK: %body4
; CHECK: %exit
; CHECK: %bail1
; CHECK: %bail2
; CHECK: %bail3
entry:
br label %body1
body1:
%iv = phi i32 [ 0, %entry ], [ %next, %body4 ]
%base = phi i32 [ 0, %entry ], [ %sum, %body4 ]
%bailcond1 = icmp eq i32 %base, 42
br i1 %bailcond1, label %bail1, label %body2
bail1:
ret i32 -1
body2:
%bailcond2 = icmp eq i32 %base, 43
br i1 %bailcond2, label %bail2, label %body3
bail2:
ret i32 -2
body3:
%bailcond3 = icmp eq i32 %base, 44
br i1 %bailcond3, label %bail3, label %body4
bail3:
ret i32 -3
body4:
%arrayidx = getelementptr inbounds i32* %a, i32 %iv
%0 = load i32* %arrayidx
%sum = add nsw i32 %0, %base
%next = add i32 %iv, 1
%exitcond = icmp eq i32 %next, %i
br i1 %exitcond, label %exit, label %body1
exit:
ret i32 %sum
}
define i32 @test_loop_rotate(i32 %i, i32* %a) {
; Check that we rotate conditional exits from the loop to the bottom of the
; loop, eliminating unconditional branches to the top.
; CHECK: test_loop_rotate:
; CHECK: %entry
; CHECK: %body1
; CHECK: %body0
; CHECK: %exit
entry:
br label %body0
body0:
%iv = phi i32 [ 0, %entry ], [ %next, %body1 ]
%base = phi i32 [ 0, %entry ], [ %sum, %body1 ]
%next = add i32 %iv, 1
%exitcond = icmp eq i32 %next, %i
br i1 %exitcond, label %exit, label %body1
body1:
%arrayidx = getelementptr inbounds i32* %a, i32 %iv
%0 = load i32* %arrayidx
%sum = add nsw i32 %0, %base
%bailcond1 = icmp eq i32 %sum, 42
br label %body0
exit:
ret i32 %base
}
define i32 @test_no_loop_rotate(i32 %i, i32* %a) {
; Check that we don't try to rotate a loop which is already laid out with
; fallthrough opportunities into the top and out of the bottom.
; CHECK: test_no_loop_rotate:
; CHECK: %entry
; CHECK: %body0
; CHECK: %body1
; CHECK: %exit
entry:
br label %body0
body0:
%iv = phi i32 [ 0, %entry ], [ %next, %body1 ]
%base = phi i32 [ 0, %entry ], [ %sum, %body1 ]
%arrayidx = getelementptr inbounds i32* %a, i32 %iv
%0 = load i32* %arrayidx
%sum = add nsw i32 %0, %base
%bailcond1 = icmp eq i32 %sum, 42
br i1 %bailcond1, label %exit, label %body1
body1:
%next = add i32 %iv, 1
%exitcond = icmp eq i32 %next, %i
br i1 %exitcond, label %exit, label %body0
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.
; CHECK: test_loop_align:
; CHECK: %entry
; CHECK: .align [[ALIGN:[0-9]+]],
; CHECK-NEXT: %body
; CHECK: %exit
entry:
br label %body
body:
%iv = phi i32 [ 0, %entry ], [ %next, %body ]
%base = phi i32 [ 0, %entry ], [ %sum, %body ]
%arrayidx = getelementptr inbounds i32* %a, i32 %iv
%0 = load i32* %arrayidx
%sum = add nsw i32 %0, %base
%next = add i32 %iv, 1
%exitcond = icmp eq i32 %next, %i
br i1 %exitcond, label %exit, label %body
exit:
ret i32 %sum
}
define i32 @test_nested_loop_align(i32 %i, i32* %a, i32* %b) {
; Check that we provide nested loop body alignment.
; CHECK: test_nested_loop_align:
; CHECK: %entry
; CHECK: .align [[ALIGN]],
; CHECK-NEXT: %loop.body.1
; CHECK: .align [[ALIGN]],
; CHECK-NEXT: %inner.loop.body
; CHECK-NOT: .align
; CHECK: %exit
entry:
br label %loop.body.1
loop.body.1:
%iv = phi i32 [ 0, %entry ], [ %next, %loop.body.2 ]
%arrayidx = getelementptr inbounds i32* %a, i32 %iv
%bidx = load i32* %arrayidx
br label %inner.loop.body
inner.loop.body:
%inner.iv = phi i32 [ 0, %loop.body.1 ], [ %inner.next, %inner.loop.body ]
%base = phi i32 [ 0, %loop.body.1 ], [ %sum, %inner.loop.body ]
%scaled_idx = mul i32 %bidx, %iv
%inner.arrayidx = getelementptr inbounds i32* %b, i32 %scaled_idx
%0 = load i32* %inner.arrayidx
%sum = add nsw i32 %0, %base
%inner.next = add i32 %iv, 1
%inner.exitcond = icmp eq i32 %inner.next, %i
br i1 %inner.exitcond, label %loop.body.2, label %inner.loop.body
loop.body.2:
%next = add i32 %iv, 1
%exitcond = icmp eq i32 %next, %i
br i1 %exitcond, label %exit, label %loop.body.1
exit:
ret i32 %sum
}
define void @unnatural_cfg1() {
; Test that we can handle a loop with an inner unnatural loop at the end of
; a function. This is a gross CFG reduced out of the single source GCC.
; CHECK: unnatural_cfg1
; CHECK: %entry
; CHECK: %loop.body1
; CHECK: %loop.body2
; CHECK: %loop.body3
entry:
br label %loop.header
loop.header:
br label %loop.body1
loop.body1:
br i1 undef, label %loop.body3, label %loop.body2
loop.body2:
%ptr = load i32** undef, align 4
br label %loop.body3
loop.body3:
%myptr = phi i32* [ %ptr2, %loop.body5 ], [ %ptr, %loop.body2 ], [ undef, %loop.body1 ]
%bcmyptr = bitcast i32* %myptr to i32*
%val = load i32* %bcmyptr, align 4
%comp = icmp eq i32 %val, 48
br i1 %comp, label %loop.body4, label %loop.body5
loop.body4:
br i1 undef, label %loop.header, label %loop.body5
loop.body5:
%ptr2 = load i32** undef, align 4
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.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: %loop.header
; 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.
; CHECK: problematic_switch
entry:
switch i32 undef, label %exit [
i32 879, label %bogus
i32 877, label %step
i32 876, label %step
i32 875, label %step
i32 874, label %step
i32 873, label %step
i32 872, label %step
i32 868, label %step
i32 867, label %step
i32 866, label %step
i32 861, label %step
i32 860, label %step
i32 856, label %step
i32 855, label %step
i32 854, label %step
i32 831, label %step
i32 830, label %step
i32 829, label %step
i32 828, label %step
i32 815, label %step
i32 814, label %step
i32 811, label %step
i32 806, label %step
i32 805, label %step
i32 804, label %step
i32 803, label %step
i32 802, label %step
i32 801, label %step
i32 800, label %step
i32 799, label %step
i32 798, label %step
i32 797, label %step
i32 796, label %step
i32 795, label %step
]
bogus:
unreachable
step:
br label %exit
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: %loop2b
; CHECK: %loop1
; 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 = load volatile float* undef
%cmp0 = fcmp une float %val0, undef
br i1 %cmp0, label %1, label %0
%val1 = load volatile float* undef
%cmp1 = fcmp une float %val1, undef
br i1 %cmp1, label %2, label %1
%val2 = load volatile float* undef
%cmp2 = fcmp une float %val2, undef
br i1 %cmp2, label %3, label %2
%val3 = load volatile float* undef
%cmp3 = fcmp une float %val3, undef
br i1 %cmp3, label %4, label %3
%val4 = load volatile float* undef
%cmp4 = fcmp une float %val4, undef
br i1 %cmp4, label %5, label %4
%val5 = load volatile float* undef
%cmp5 = fcmp une float %val5, undef
br i1 %cmp5, label %6, label %5
%val6 = load volatile float* undef
%cmp6 = fcmp une float %val6, undef
br i1 %cmp6, label %7, label %6
%val7 = load volatile float* undef
%cmp7 = fcmp une float %val7, undef
br i1 %cmp7, label %8, label %7
%val8 = load volatile float* undef
%cmp8 = fcmp une float %val8, undef
br i1 %cmp8, label %9, label %8
%val9 = load volatile float* undef
%cmp9 = fcmp une float %val9, undef
br i1 %cmp9, label %10, label %9
%val10 = load volatile float* undef
%cmp10 = fcmp une float %val10, undef
br i1 %cmp10, label %11, label %10
%val11 = load volatile float* undef
%cmp11 = fcmp une float %val11, undef
br i1 %cmp11, label %12, label %11
%val12 = load volatile float* undef
%cmp12 = fcmp une float %val12, undef
br i1 %cmp12, label %13, label %12
%val13 = load volatile float* undef
%cmp13 = fcmp une float %val13, undef
br i1 %cmp13, label %14, label %13
%val14 = load volatile float* undef
%cmp14 = fcmp une float %val14, undef
br i1 %cmp14, label %15, label %14
%val15 = load volatile float* undef
%cmp15 = fcmp une float %val15, undef
br i1 %cmp15, label %16, label %15
%val16 = load volatile float* undef
%cmp16 = fcmp une float %val16, undef
br i1 %cmp16, label %17, label %16
%val17 = load volatile float* undef
%cmp17 = fcmp une float %val17, undef
br i1 %cmp17, label %18, label %17
%val18 = load volatile float* undef
%cmp18 = fcmp une float %val18, undef
br i1 %cmp18, label %19, label %18
%val19 = load volatile float* undef
%cmp19 = fcmp une float %val19, undef
br i1 %cmp19, label %20, label %19
%val20 = load volatile float* undef
%cmp20 = fcmp une float %val20, undef
br i1 %cmp20, label %21, label %20
%val21 = load volatile float* undef
%cmp21 = fcmp une float %val21, undef
br i1 %cmp21, label %22, label %21
%val22 = load volatile float* undef
%cmp22 = fcmp une float %val22, undef
br i1 %cmp22, label %23, label %22
%val23 = load volatile float* undef
%cmp23 = fcmp une float %val23, undef
br i1 %cmp23, label %24, label %23
%val24 = load volatile float* undef
%cmp24 = fcmp une float %val24, undef
br i1 %cmp24, label %25, label %24
%val25 = load volatile float* undef
%cmp25 = fcmp une float %val25, undef
br i1 %cmp25, label %26, label %25
%val26 = load volatile float* undef
%cmp26 = fcmp une float %val26, undef
br i1 %cmp26, label %27, label %26
%val27 = load volatile float* undef
%cmp27 = fcmp une float %val27, undef
br i1 %cmp27, label %28, label %27
%val28 = load volatile float* undef
%cmp28 = fcmp une float %val28, undef
br i1 %cmp28, label %29, label %28
%val29 = load volatile float* undef
%cmp29 = fcmp une float %val29, undef
br i1 %cmp29, label %30, label %29
%val30 = load volatile float* undef
%cmp30 = fcmp une float %val30, undef
br i1 %cmp30, label %31, label %30
%val31 = load volatile float* undef
%cmp31 = fcmp une float %val31, undef
br i1 %cmp31, label %32, label %31
%val32 = load volatile float* undef
%cmp32 = fcmp une float %val32, undef
br i1 %cmp32, label %33, label %32
%val33 = load volatile float* undef
%cmp33 = fcmp une float %val33, undef
br i1 %cmp33, label %34, label %33
%val34 = load volatile float* undef
%cmp34 = fcmp une float %val34, undef
br i1 %cmp34, label %35, label %34
%val35 = load volatile float* undef
%cmp35 = fcmp une float %val35, undef
br i1 %cmp35, label %36, label %35
%val36 = load volatile float* undef
%cmp36 = fcmp une float %val36, undef
br i1 %cmp36, label %37, label %36
%val37 = load volatile float* undef
%cmp37 = fcmp une float %val37, undef
br i1 %cmp37, label %38, label %37
%val38 = load volatile float* undef
%cmp38 = fcmp une float %val38, undef
br i1 %cmp38, label %39, label %38
%val39 = load volatile float* undef
%cmp39 = fcmp une float %val39, undef
br i1 %cmp39, label %40, label %39
%val40 = load volatile float* undef
%cmp40 = fcmp une float %val40, undef
br i1 %cmp40, label %41, label %40
%val41 = load volatile float* undef
%cmp41 = fcmp une float %val41, undef
br i1 %cmp41, label %42, label %41
%val42 = load volatile float* undef
%cmp42 = fcmp une float %val42, undef
br i1 %cmp42, label %43, label %42
%val43 = load volatile float* undef
%cmp43 = fcmp une float %val43, undef
br i1 %cmp43, label %44, label %43
%val44 = load volatile float* undef
%cmp44 = fcmp une float %val44, undef
br i1 %cmp44, label %45, label %44
%val45 = load volatile float* undef
%cmp45 = fcmp une float %val45, undef
br i1 %cmp45, label %46, label %45
%val46 = load volatile float* undef
%cmp46 = fcmp une float %val46, undef
br i1 %cmp46, label %47, label %46
%val47 = load volatile float* undef
%cmp47 = fcmp une float %val47, undef
br i1 %cmp47, label %48, label %47
%val48 = load volatile float* undef
%cmp48 = fcmp une float %val48, undef
br i1 %cmp48, label %49, label %48
%val49 = load volatile float* undef
%cmp49 = fcmp une float %val49, undef
br i1 %cmp49, label %50, label %49
%val50 = load volatile float* undef
%cmp50 = fcmp une float %val50, undef
br i1 %cmp50, label %51, label %50
%val51 = load volatile float* undef
%cmp51 = fcmp une float %val51, undef
br i1 %cmp51, label %52, label %51
%val52 = load volatile float* undef
%cmp52 = fcmp une float %val52, undef
br i1 %cmp52, label %53, label %52
%val53 = load volatile float* undef
%cmp53 = fcmp une float %val53, undef
br i1 %cmp53, label %54, label %53
%val54 = load volatile float* undef
%cmp54 = fcmp une float %val54, undef
br i1 %cmp54, label %55, label %54
%val55 = load volatile float* undef
%cmp55 = fcmp une float %val55, undef
br i1 %cmp55, label %56, label %55
%val56 = load volatile float* undef
%cmp56 = fcmp une float %val56, undef
br i1 %cmp56, label %57, label %56
%val57 = load volatile float* undef
%cmp57 = fcmp une float %val57, undef
br i1 %cmp57, label %58, label %57
%val58 = load volatile float* undef
%cmp58 = fcmp une float %val58, undef
br i1 %cmp58, label %59, label %58
%val59 = load volatile float* undef
%cmp59 = fcmp une float %val59, undef
br i1 %cmp59, label %60, label %59
%val60 = load volatile float* undef
%cmp60 = fcmp une float %val60, undef
br i1 %cmp60, label %61, label %60
%val61 = load volatile float* undef
%cmp61 = fcmp une float %val61, undef
br i1 %cmp61, label %62, label %61
%val62 = load volatile float* undef
%cmp62 = fcmp une float %val62, undef
br i1 %cmp62, label %63, label %62
%val63 = load volatile float* undef
%cmp63 = fcmp une float %val63, undef
br i1 %cmp63, label %64, label %63
%val64 = load volatile float* undef
%cmp64 = fcmp une float %val64, undef
br i1 %cmp64, label %65, label %64
br label %exit
exit:
ret void
}
define void @benchmark_heapsort(i32 %n, double* nocapture %ra) {
; This test case comes from the heapsort benchmark, and exemplifies several
; important aspects to block placement in the presence of loops:
; 1) Loop rotation needs to *ensure* that the desired exiting edge can be
; a fallthrough.
; 2) The exiting edge from the loop which is rotated to be laid out at the
; bottom of the loop needs to be exiting into the nearest enclosing loop (to
; which there is an exit). Otherwise, we force that enclosing loop into
; strange layouts that are siginificantly less efficient, often times maing
; it discontiguous.
;
; CHECK: @benchmark_heapsort
; CHECK: %entry
; First rotated loop top.
; CHECK: .align
; CHECK: %while.end
; CHECK: %for.cond
; CHECK: %if.then
; CHECK: %if.else
; CHECK: %if.end10
; Second rotated loop top
; CHECK: .align
; CHECK: %if.then24
; CHECK: %while.cond.outer
; Third rotated loop top
; CHECK: .align
; CHECK: %while.cond
; CHECK: %while.body
; CHECK: %land.lhs.true
; CHECK: %if.then19
; CHECK: %if.then19
; CHECK: %if.then8
; CHECK: ret
entry:
%shr = ashr i32 %n, 1
%add = add nsw i32 %shr, 1
%arrayidx3 = getelementptr inbounds double* %ra, i64 1
br label %for.cond
for.cond:
%ir.0 = phi i32 [ %n, %entry ], [ %ir.1, %while.end ]
%l.0 = phi i32 [ %add, %entry ], [ %l.1, %while.end ]
%cmp = icmp sgt i32 %l.0, 1
br i1 %cmp, label %if.then, label %if.else
if.then:
%dec = add nsw i32 %l.0, -1
%idxprom = sext i32 %dec to i64
%arrayidx = getelementptr inbounds double* %ra, i64 %idxprom
%0 = load double* %arrayidx, align 8
br label %if.end10
if.else:
%idxprom1 = sext i32 %ir.0 to i64
%arrayidx2 = getelementptr inbounds double* %ra, i64 %idxprom1
%1 = load double* %arrayidx2, align 8
%2 = load double* %arrayidx3, align 8
store double %2, double* %arrayidx2, align 8
%dec6 = add nsw i32 %ir.0, -1
%cmp7 = icmp eq i32 %dec6, 1
br i1 %cmp7, label %if.then8, label %if.end10
if.then8:
store double %1, double* %arrayidx3, align 8
ret void
if.end10:
%ir.1 = phi i32 [ %ir.0, %if.then ], [ %dec6, %if.else ]
%l.1 = phi i32 [ %dec, %if.then ], [ %l.0, %if.else ]
%rra.0 = phi double [ %0, %if.then ], [ %1, %if.else ]
%add31 = add nsw i32 %ir.1, 1
br label %while.cond.outer
while.cond.outer:
%j.0.ph.in = phi i32 [ %l.1, %if.end10 ], [ %j.1, %if.then24 ]
%j.0.ph = shl i32 %j.0.ph.in, 1
br label %while.cond
while.cond:
%j.0 = phi i32 [ %add31, %if.end20 ], [ %j.0.ph, %while.cond.outer ]
%cmp11 = icmp sgt i32 %j.0, %ir.1
br i1 %cmp11, label %while.end, label %while.body
while.body:
%cmp12 = icmp slt i32 %j.0, %ir.1
br i1 %cmp12, label %land.lhs.true, label %if.end20
land.lhs.true:
%idxprom13 = sext i32 %j.0 to i64
%arrayidx14 = getelementptr inbounds double* %ra, i64 %idxprom13
%3 = load double* %arrayidx14, align 8
%add15 = add nsw i32 %j.0, 1
%idxprom16 = sext i32 %add15 to i64
%arrayidx17 = getelementptr inbounds double* %ra, i64 %idxprom16
%4 = load double* %arrayidx17, align 8
%cmp18 = fcmp olt double %3, %4
br i1 %cmp18, label %if.then19, label %if.end20
if.then19:
br label %if.end20
if.end20:
%j.1 = phi i32 [ %add15, %if.then19 ], [ %j.0, %land.lhs.true ], [ %j.0, %while.body ]
%idxprom21 = sext i32 %j.1 to i64
%arrayidx22 = getelementptr inbounds double* %ra, i64 %idxprom21
%5 = load double* %arrayidx22, align 8
%cmp23 = fcmp olt double %rra.0, %5
br i1 %cmp23, label %if.then24, label %while.cond
if.then24:
%idxprom27 = sext i32 %j.0.ph.in to i64
%arrayidx28 = getelementptr inbounds double* %ra, i64 %idxprom27
store double %5, double* %arrayidx28, align 8
br label %while.cond.outer
while.end:
%idxprom33 = sext i32 %j.0.ph.in to i64
%arrayidx34 = getelementptr inbounds double* %ra, i64 %idxprom33
store double %rra.0, double* %arrayidx34, align 8
br label %for.cond
}
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