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728acc9bd9
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. llvm-svn: 154816
217 lines
4.6 KiB
LLVM
217 lines
4.6 KiB
LLVM
; RUN: llc < %s -march=x86-64 -mtriple=x86_64-unknown-linux-gnu -asm-verbose=false | FileCheck %s
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; These tests check for loop branching structure, and that the loop align
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; directive is placed in the expected place.
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; CodeGen should insert a branch into the middle of the loop in
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; order to avoid a branch within the loop.
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; CHECK: simple:
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; CHECK: jmp .LBB0_1
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; CHECK-NEXT: align
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; CHECK-NEXT: .LBB0_2:
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; CHECK-NEXT: callq loop_latch
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; CHECK-NEXT: .LBB0_1:
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; CHECK-NEXT: callq loop_header
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define void @simple() nounwind {
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entry:
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br label %loop
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loop:
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call void @loop_header()
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%t0 = tail call i32 @get()
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%t1 = icmp slt i32 %t0, 0
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br i1 %t1, label %done, label %bb
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bb:
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call void @loop_latch()
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br label %loop
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done:
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call void @exit()
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ret void
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}
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; CodeGen should move block_a to the top of the loop so that it
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; falls through into the loop, avoiding a branch within the loop.
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; CHECK: slightly_more_involved:
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; CHECK: jmp .LBB1_1
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; CHECK-NEXT: align
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; CHECK-NEXT: .LBB1_4:
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; CHECK-NEXT: callq bar99
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; CHECK-NEXT: align
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; CHECK-NEXT: .LBB1_1:
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; CHECK-NEXT: callq body
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define void @slightly_more_involved() nounwind {
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entry:
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br label %loop
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loop:
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call void @body()
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%t0 = call i32 @get()
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%t1 = icmp slt i32 %t0, 2
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br i1 %t1, label %block_a, label %bb
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bb:
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%t2 = call i32 @get()
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%t3 = icmp slt i32 %t2, 99
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br i1 %t3, label %exit, label %loop
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block_a:
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call void @bar99()
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br label %loop
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exit:
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call void @exit()
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ret void
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}
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; Same as slightly_more_involved, but block_a is now a CFG diamond with
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; fallthrough edges which should be preserved.
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; "callq block_a_merge_func" is tail duped.
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; CHECK: yet_more_involved:
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; CHECK: jmp .LBB2_1
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; CHECK-NEXT: align
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; CHECK-NEXT: .LBB2_5:
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; CHECK-NEXT: callq block_a_true_func
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; CHECK-NEXT: callq block_a_merge_func
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; CHECK-NEXT: align
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; CHECK-NEXT: .LBB2_1:
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; CHECK-NEXT: callq body
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;
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; LBB2_4
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; CHECK: callq bar99
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; CHECK-NEXT: callq get
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; CHECK-NEXT: cmpl $2999, %eax
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; CHECK-NEXT: jle .LBB2_5
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; CHECK-NEXT: callq block_a_false_func
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; CHECK-NEXT: callq block_a_merge_func
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; CHECK-NEXT: jmp .LBB2_1
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define void @yet_more_involved() nounwind {
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entry:
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br label %loop
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loop:
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call void @body()
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%t0 = call i32 @get()
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%t1 = icmp slt i32 %t0, 2
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br i1 %t1, label %block_a, label %bb
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bb:
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%t2 = call i32 @get()
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%t3 = icmp slt i32 %t2, 99
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br i1 %t3, label %exit, label %loop
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block_a:
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call void @bar99()
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%z0 = call i32 @get()
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%z1 = icmp slt i32 %z0, 3000
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br i1 %z1, label %block_a_true, label %block_a_false
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block_a_true:
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call void @block_a_true_func()
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br label %block_a_merge
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block_a_false:
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call void @block_a_false_func()
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br label %block_a_merge
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block_a_merge:
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call void @block_a_merge_func()
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br label %loop
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exit:
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call void @exit()
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ret void
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}
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; CodeGen should move the CFG islands that are part of the loop but don't
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; conveniently fit anywhere so that they are at least contiguous with the
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; loop.
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; CHECK: cfg_islands:
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; CHECK: jmp .LBB3_1
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; CHECK-NEXT: align
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; CHECK-NEXT: .LBB3_7:
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; CHECK-NEXT: callq bar100
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; CHECK-NEXT: align
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; CHECK-NEXT: .LBB3_1:
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; CHECK-NEXT: callq loop_header
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; CHECK: jl .LBB3_7
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; CHECK: jge .LBB3_3
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; CHECK-NEXT: callq bar101
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; CHECK-NEXT: jmp .LBB3_1
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; CHECK-NEXT: .LBB3_3:
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; CHECK: jge .LBB3_4
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; CHECK-NEXT: callq bar102
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; CHECK-NEXT: jmp .LBB3_1
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; CHECK-NEXT: .LBB3_4:
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; CHECK: jl .LBB3_6
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; CHECK-NEXT: callq loop_latch
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; CHECK-NEXT: jmp .LBB3_1
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; CHECK-NEXT: .LBB3_6:
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define void @cfg_islands() nounwind {
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entry:
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br label %loop
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loop:
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call void @loop_header()
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%t0 = call i32 @get()
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%t1 = icmp slt i32 %t0, 100
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br i1 %t1, label %block100, label %bb
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bb:
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%t2 = call i32 @get()
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%t3 = icmp slt i32 %t2, 101
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br i1 %t3, label %block101, label %bb1
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bb1:
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%t4 = call i32 @get()
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%t5 = icmp slt i32 %t4, 102
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br i1 %t5, label %block102, label %bb2
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bb2:
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%t6 = call i32 @get()
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%t7 = icmp slt i32 %t6, 103
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br i1 %t7, label %exit, label %bb3
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bb3:
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call void @loop_latch()
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br label %loop
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exit:
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call void @exit()
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ret void
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block100:
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call void @bar100()
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br label %loop
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block101:
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call void @bar101()
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br label %loop
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block102:
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call void @bar102()
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br label %loop
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}
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declare void @bar99() nounwind
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declare void @bar100() nounwind
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declare void @bar101() nounwind
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declare void @bar102() nounwind
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declare void @body() nounwind
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declare void @exit() nounwind
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declare void @loop_header() nounwind
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declare void @loop_latch() nounwind
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declare i32 @get() nounwind
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declare void @block_a_true_func() nounwind
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declare void @block_a_false_func() nounwind
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declare void @block_a_merge_func() nounwind
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