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1; This test is mainly for the -outliner-leaf-descendants flag for MachineOutliner.2;3; ===================== -outliner-leaf-descendants=false =====================4; MachineOutliner finds THREE key `OutlinedFunction` and outlines them. They are:5; ```6; mov w0, #17; mov w1, #28; mov w2, #39; mov w3, #410; mov w4, #511; mov w5, #6 or #7 or #812; b13; ```14; Each has:15; - `SequenceSize=28` and `OccurrenceCount=2`16; - each Candidate has `CallOverhead=4` and `FrameOverhead=0`17; - `NotOutlinedCost=28*2=56` and `OutliningCost=4*2+28+0=36`18; - `Benefit=56-36=20` and `Priority=56/36=1.56`19;20; ===================== -outliner-leaf-descendants=true =====================21; MachineOutliner finds a FOURTH key `OutlinedFunction`, which is:22; ```23; mov w0, #124; mov w1, #225; mov w2, #326; mov w3, #427; mov w4, #528; ```29; This corresponds to an internal node that has ZERO leaf children, but SIX leaf descendants.30; It has:31; - `SequenceSize=20` and `OccurrenceCount=6`32; - each Candidate has `CallOverhead=12` and `FrameOverhead=4`33; - `NotOutlinedCost=20*6=120` and `OutliningCost=12*6+20+4=96`34; - `Benefit=120-96=24` and `Priority=120/96=1.25`35;36; The FOURTH `OutlinedFunction` has lower _priority_ compared to the first THREE `OutlinedFunction`.37; Hence, we use `-outliner-benefit-threshold=22` to check if the FOURTH `OutlinedFunction` is identified.38 39; RUN: llc %s -enable-machine-outliner=always -outliner-leaf-descendants=false -filetype=obj -o %t40; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=CHECK-BASELINE41 42; RUN: llc %s -enable-machine-outliner=always -outliner-leaf-descendants=false -outliner-benefit-threshold=22 -filetype=obj -o %t43; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=CHECK-NO-CANDIDATE44 45; RUN: llc %s -enable-machine-outliner=always -outliner-leaf-descendants=true -filetype=obj -o %t46; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=CHECK-BASELINE47 48; RUN: llc %s -enable-machine-outliner=always -outliner-leaf-descendants=true -outliner-benefit-threshold=22 -filetype=obj -o %t49; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=CHECK-LEAF-DESCENDANTS50 51 52target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"53target triple = "arm64-apple-macosx14.0.0"54 55declare i32 @_Z3fooiiii(i32 noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef)56 57define i32 @_Z2f1v() minsize {58 %1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 6)59 ret i32 %160}61 62define i32 @_Z2f2v() minsize {63 %1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 6)64 ret i32 %165}66 67define i32 @_Z2f3v() minsize {68 %1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 7)69 ret i32 %170}71 72define i32 @_Z2f4v() minsize {73 %1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 7)74 ret i32 %175}76 77define i32 @_Z2f5v() minsize {78 %1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 8)79 ret i32 %180}81 82define i32 @_Z2f6v() minsize {83 %1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 8)84 ret i32 %185}86 87; CHECK-BASELINE: <_OUTLINED_FUNCTION_0>:88; CHECK-BASELINE-NEXT: mov w0, #0x189; CHECK-BASELINE-NEXT: mov w1, #0x290; CHECK-BASELINE-NEXT: mov w2, #0x391; CHECK-BASELINE-NEXT: mov w3, #0x492; CHECK-BASELINE-NEXT: mov w4, #0x593; CHECK-BASELINE-NEXT: mov w5, #0x694; CHECK-BASELINE-NEXT: b95 96; CHECK-BASELINE: <_OUTLINED_FUNCTION_1>:97; CHECK-BASELINE-NEXT: mov w0, #0x198; CHECK-BASELINE-NEXT: mov w1, #0x299; CHECK-BASELINE-NEXT: mov w2, #0x3100; CHECK-BASELINE-NEXT: mov w3, #0x4101; CHECK-BASELINE-NEXT: mov w4, #0x5102; CHECK-BASELINE-NEXT: mov w5, #0x8103; CHECK-BASELINE-NEXT: b104 105; CHECK-BASELINE: <_OUTLINED_FUNCTION_2>:106; CHECK-BASELINE-NEXT: mov w0, #0x1107; CHECK-BASELINE-NEXT: mov w1, #0x2108; CHECK-BASELINE-NEXT: mov w2, #0x3109; CHECK-BASELINE-NEXT: mov w3, #0x4110; CHECK-BASELINE-NEXT: mov w4, #0x5111; CHECK-BASELINE-NEXT: mov w5, #0x7112; CHECK-BASELINE-NEXT: b113 114; CHECK-LEAF-DESCENDANTS: <_OUTLINED_FUNCTION_0>:115; CHECK-LEAF-DESCENDANTS-NEXT: mov w0, #0x1116; CHECK-LEAF-DESCENDANTS-NEXT: mov w1, #0x2117; CHECK-LEAF-DESCENDANTS-NEXT: mov w2, #0x3118; CHECK-LEAF-DESCENDANTS-NEXT: mov w3, #0x4119; CHECK-LEAF-DESCENDANTS-NEXT: mov w4, #0x5120; CHECK-LEAF-DESCENDANTS-NEXT: ret121 122; CHECK-LEAF-DESCENDANTS-NOT: <_OUTLINED_FUNCTION_1>:123 124; CHECK-NO-CANDIDATE-NOT: <_OUTLINED_FUNCTION_0>:125