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[RISCV] Add testcase for outlining leaf descendants #114450

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Merged
merged 2 commits into from
Nov 3, 2024
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[RISCV] Add testcase for outlining leaf descendants #114450

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f445489
Add testcase for outlining leaf descendants
hiraditya Oct 31, 2024
aacc3a9
Merge branch 'main' into machine_outliner
hiraditya Nov 1, 2024
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127 changes: 127 additions & 0 deletions llvm/test/CodeGen/RISCV/machine-outliner-leaf-descendants.ll
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; This test is mainly for the -outliner-leaf-descendants flag for MachineOutliner.
;
; ===================== -outliner-leaf-descendants=false =====================
; MachineOutliner finds THREE key `OutlinedFunction` and outlines them. They are:
; ```
; mov w0, #1
; mov w1, #2
; mov w2, #3
; mov w3, #4
; mov w4, #5
; mov w5, #6 or #7 or #8
; b
; ```
; Each has:
; - `SequenceSize=28` and `OccurrenceCount=2`
; - each Candidate has `CallOverhead=4` and `FrameOverhead=0`
; - `NotOutlinedCost=28*2=56` and `OutliningCost=4*2+28+0=36`
; - `Benefit=56-36=20` and `Priority=56/36=1.56`
;
; ===================== -outliner-leaf-descendants=true =====================
; MachineOutliner finds a FOURTH key `OutlinedFunction`, which is:
; ```
; mov w0, #1
; mov w1, #2
; mov w2, #3
; mov w3, #4
; mov w4, #5
; ```
; This corresponds to an internal node that has ZERO leaf children, but SIX leaf descendants.
; It has:
; - `SequenceSize=20` and `OccurrenceCount=6`
; - each Candidate has `CallOverhead=12` and `FrameOverhead=4`
; - `NotOutlinedCost=20*6=120` and `OutliningCost=12*6+20+4=96`
; - `Benefit=120-96=24` and `Priority=120/96=1.25`
;
; The FOURTH `OutlinedFunction` has lower _priority_ compared to the first THREE `OutlinedFunction`.
; Hence, we use `-outliner-benefit-threshold=22` to check if the FOURTH `OutlinedFunction` is identified.

; RUN: llc %s -enable-machine-outliner=always -outliner-leaf-descendants=false -mattr=+m -mtriple=riscv64 -filetype=obj -o %t
; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=CHECK-BASELINE

; RUN: llc %s -enable-machine-outliner=always -outliner-leaf-descendants=false -mattr=+m -mtriple=riscv64 -outliner-benefit-threshold=22 -filetype=obj -o %t
; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=CHECK-NO-CANDIDATE

; RUN: llc %s -enable-machine-outliner=always -outliner-leaf-descendants=false -mattr=+m -mtriple=riscv32 -filetype=obj -o %t
; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=CHECK-BASELINE

; RUN: llc %s -enable-machine-outliner=always -outliner-leaf-descendants=false -mattr=+m -mtriple=riscv32 -outliner-benefit-threshold=22 -filetype=obj -o %t
; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=CHECK-NO-CANDIDATE

; RUN: llc %s -enable-machine-outliner=always -outliner-leaf-descendants=true -mattr=+m -mtriple=riscv64 -filetype=obj -o %t
; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=CHECK-LEAF-DESCENDANTS

; RUN: llc %s -enable-machine-outliner=always -outliner-leaf-descendants=true -mattr=+m -mtriple=riscv64 -outliner-benefit-threshold=22 -filetype=obj -o %t
; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=CHECK-LEAF-DESCENDANTS


declare i32 @_Z3fooiiii(i32 noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef)

define i32 @_Z2f1v() minsize {
%1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 6)
ret i32 %1
}

define i32 @_Z2f2v() minsize {
%1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 6)
ret i32 %1
}

define i32 @_Z2f3v() minsize {
%1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 7)
ret i32 %1
}

define i32 @_Z2f4v() minsize {
%1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 7)
ret i32 %1
}

define i32 @_Z2f5v() minsize {
%1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 8)
ret i32 %1
}

define i32 @_Z2f6v() minsize {
%1 = tail call i32 @_Z3fooiiii(i32 noundef 1, i32 noundef 2, i32 noundef 3, i32 noundef 4, i32 noundef 5, i32 noundef 8)
ret i32 %1
}

; CHECK-BASELINE: <OUTLINED_FUNCTION_0>:
; CHECK-BASELINE-NEXT: li a0, 0x1
; CHECK-BASELINE-NEXT: li a1, 0x2
; CHECK-BASELINE-NEXT: li a2, 0x3
; CHECK-BASELINE-NEXT: li a3, 0x4
; CHECK-BASELINE-NEXT: li a4, 0x5
; CHECK-BASELINE-NEXT: li a5, 0x6
; CHECK-BASELINE-NEXT: jr t0

; CHECK-BASELINE: <OUTLINED_FUNCTION_1>:
; CHECK-BASELINE-NEXT: li a0, 0x1
; CHECK-BASELINE-NEXT: li a1, 0x2
; CHECK-BASELINE-NEXT: li a2, 0x3
; CHECK-BASELINE-NEXT: li a3, 0x4
; CHECK-BASELINE-NEXT: li a4, 0x5
; CHECK-BASELINE-NEXT: li a5, 0x7
; CHECK-BASELINE-NEXT: jr t0

; CHECK-BASELINE: <OUTLINED_FUNCTION_2>:
; CHECK-BASELINE-NEXT: li a0, 0x1
; CHECK-BASELINE-NEXT: li a1, 0x2
; CHECK-BASELINE-NEXT: li a2, 0x3
; CHECK-BASELINE-NEXT: li a3, 0x4
; CHECK-BASELINE-NEXT: li a4, 0x5
; CHECK-BASELINE-NEXT: li a5, 0x8
; CHECK-BASELINE-NEXT: jr t0

; CHECK-LEAF-DESCENDANTS: <OUTLINED_FUNCTION_0>:
; CHECK-LEAF-DESCENDANTS-NEXT: li a0, 0x1
; CHECK-LEAF-DESCENDANTS-NEXT: li a1, 0x2
; CHECK-LEAF-DESCENDANTS-NEXT: li a2, 0x3
; CHECK-LEAF-DESCENDANTS-NEXT: li a3, 0x4
; CHECK-LEAF-DESCENDANTS-NEXT: li a4, 0x5
; CHECK-LEAF-DESCENDANTS-NEXT: jr t0

; CHECK-LEAF-DESCENDANTS-NOT: <OUTLINED_FUNCTION_1>:

; CHECK-NO-CANDIDATE-NOT: <OUTLINED_FUNCTION_0>:
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