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merged 3 commits into from
Aug 29, 2024
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[AMDGPU] Graph-based Module Splitting Rewrite #104763

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ce1813b
[AMDGPU] Graph-based Module Splitting Rewrite
Pierre-vh Aug 19, 2024
63c8f30
Address comments
Pierre-vh Aug 20, 2024
93d9800
Comments, refactor verify
Pierre-vh Aug 21, 2024
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1,802 changes: 1,272 additions & 530 deletions llvm/lib/Target/AMDGPU/AMDGPUSplitModule.cpp
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36 changes: 15 additions & 21 deletions llvm/test/tools/llvm-split/AMDGPU/address-taken-externalize-with-call.ll
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Original file line number Diff line number Diff line change
@@ -1,30 +1,24 @@
; RUN: llvm-split -o %t %s -j 3 -mtriple amdgcn-amd-amdhsa -amdgpu-module-splitting-large-function-threshold=0
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 %s
; RUN: llvm-split -o %t %s -j 3 -mtriple amdgcn-amd-amdhsa -amdgpu-module-splitting-large-threshold=0
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 --implicit-check-not=define %s

; 3 kernels:
; - A does a direct call to HelperA
; - B is storing @HelperA
; - C does a direct call to HelperA
;
; The helper functions will get externalized, which will force A and C into P0 as
; external functions cannot be duplicated.

; CHECK0: define hidden void @HelperA()
; CHECK0: define amdgpu_kernel void @A()
; CHECK0: declare amdgpu_kernel void @B(ptr)
; CHECK0: define amdgpu_kernel void @C()

; CHECK1: declare hidden void @HelperA()
; CHECK1: declare amdgpu_kernel void @A()
; CHECK1: declare amdgpu_kernel void @B(ptr)
; CHECK1: declare amdgpu_kernel void @C()

; CHECK2: declare hidden void @HelperA()
; CHECK2: declare amdgpu_kernel void @A()
; CHECK2: define amdgpu_kernel void @B(ptr %dst)
; CHECK2: declare amdgpu_kernel void @C()
; The helper functions will get externalized, so C/A will end up
; in the same partition.

; P0 is empty.
; CHECK0: declare

; CHECK1: define amdgpu_kernel void @B(ptr %dst)

; CHECK2: define hidden void @HelperA()
; CHECK2: define amdgpu_kernel void @A()
; CHECK2: define amdgpu_kernel void @C()

define internal void @HelperA() {
ret void
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2 changes: 1 addition & 1 deletion llvm/test/tools/llvm-split/AMDGPU/address-taken-externalize.ll
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@@ -1,4 +1,4 @@
; RUN: llvm-split -o %t %s -j 2 -mtriple amdgcn-amd-amdhsa -amdgpu-module-splitting-large-function-threshold=0
; RUN: llvm-split -o %t %s -j 2 -mtriple amdgcn-amd-amdhsa -amdgpu-module-splitting-large-threshold=0
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s

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20 changes: 0 additions & 20 deletions llvm/test/tools/llvm-split/AMDGPU/debug-name-hiding.ll
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36 changes: 0 additions & 36 deletions llvm/test/tools/llvm-split/AMDGPU/debug-non-kernel-root.ll
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9 changes: 3 additions & 6 deletions llvm/test/tools/llvm-split/AMDGPU/declarations.ll
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Original file line number Diff line number Diff line change
@@ -1,15 +1,12 @@
; RUN: llvm-split -o %t %s -j 2 -mtriple amdgcn-amd-amdhsa
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
; RUN: not llvm-dis -o - %t1

; Check that all declarations are put into each partition.
; Empty module without any defs should result in a single output module that is
; an exact copy of the input.

; CHECK0: declare void @A
; CHECK0: declare void @B

; CHECK1: declare void @A
; CHECK1: declare void @B

declare void @A()

declare void @B()
18 changes: 7 additions & 11 deletions llvm/test/tools/llvm-split/AMDGPU/kernels-alias-dependencies.ll
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
; RUN: llvm-split -o %t %s -j 2 -mtriple amdgcn-amd-amdhsa
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 --implicit-check-not=define %s

; 3 kernels:
; - A calls nothing
Expand All @@ -13,16 +13,12 @@
; Additionally, @PerryThePlatypus gets externalized as
; the alias counts as taking its address.

; CHECK0-NOT: define
; CHECK0: @Perry = internal alias ptr (), ptr @PerryThePlatypus
; CHECK0: define hidden void @PerryThePlatypus()
; CHECK0: define amdgpu_kernel void @B
; CHECK0: define amdgpu_kernel void @C
; CHECK0-NOT: define
; CHECK0: define amdgpu_kernel void @A

; CHECK1-NOT: define
; CHECK1: define amdgpu_kernel void @A
; CHECK1-NOT: define
; CHECK1: @Perry = internal alias ptr (), ptr @PerryThePlatypus
; CHECK1: define hidden void @PerryThePlatypus()
; CHECK1: define amdgpu_kernel void @B
; CHECK1: define amdgpu_kernel void @C

@Perry = internal alias ptr(), ptr @PerryThePlatypus

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12 changes: 3 additions & 9 deletions llvm/test/tools/llvm-split/AMDGPU/kernels-cost-ranking.ll
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@@ -1,27 +1,21 @@
; RUN: llvm-split -o %t %s -j 3 -mtriple amdgcn-amd-amdhsa
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 %s
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 --implicit-check-not=define %s

; 3 kernels with each their own dependencies should go into 3
; distinct partitions. The most expensive kernel should be
; seen first and go into the last partition.

; CHECK0-NOT: define
; CHECK0: define amdgpu_kernel void @C
; CHECK0: define internal void @HelperC
; CHECK0-NOT: define

; CHECK1-NOT: define
; CHECK1: define amdgpu_kernel void @A
; CHECK1: define internal void @HelperA
; CHECK1-NOT: define

; CHECK2-NOT: define
; CHECK2: define amdgpu_kernel void @B
; CHECK2: define internal void @HelperB
; CHECK2-NOT: define


define amdgpu_kernel void @A() {
call void @HelperA()
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33 changes: 12 additions & 21 deletions llvm/test/tools/llvm-split/AMDGPU/kernels-dependency-external.ll
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Original file line number Diff line number Diff line change
@@ -1,29 +1,20 @@
; RUN: llvm-split -o %t %s -j 4 -mtriple amdgcn-amd-amdhsa
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 %s
; RUN: llvm-dis -o - %t3 | FileCheck --check-prefix=CHECK3 %s
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t3 | FileCheck --check-prefix=CHECK3 --implicit-check-not=define %s

; Both overridable helper should go in P0.
; CHECK0: define internal void @PrivateHelper1()
; CHECK0: define amdgpu_kernel void @D

; CHECK0-NOT: define
; CHECK0: define available_externally void @OverridableHelper0()
; CHECK0: define internal void @OverridableHelper1()
; CHECK0: define amdgpu_kernel void @A
; CHECK0: define amdgpu_kernel void @B
; CHECK0-NOT: define
; CHECK1: define internal void @PrivateHelper0()
; CHECK1: define amdgpu_kernel void @C

; CHECK1-NOT: define
; CHECK2: define internal void @OverridableHelper1()
; CHECK2: define amdgpu_kernel void @B

; CHECK2-NOT: define
; CHECK2: define internal void @PrivateHelper1()
; CHECK2: define amdgpu_kernel void @D
; CHECK2-NOT: define

; CHECK3-NOT: define
; CHECK3: define internal void @PrivateHelper0()
; CHECK3: define amdgpu_kernel void @C
; CHECK3-NOT: define
; CHECK3: define available_externally void @OverridableHelper0()
; CHECK3: define amdgpu_kernel void @A

define available_externally void @OverridableHelper0() {
ret void
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30 changes: 12 additions & 18 deletions llvm/test/tools/llvm-split/AMDGPU/kernels-dependency-indirect.ll
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
; RUN: llvm-split -o %t %s -j 3 -mtriple amdgcn-amd-amdhsa
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 %s
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 --implicit-check-not=define %s

; We have 4 kernels:
; - Each kernel has an internal helper
Expand All @@ -15,25 +15,19 @@
; indirect call. HelperC/D should also end up in P0 as they
; are dependencies of HelperB.

; CHECK0-NOT: define
; CHECK0: define hidden void @HelperA
; CHECK0: define hidden void @HelperB
; CHECK0: define hidden void @CallCandidate
; CHECK0: define internal void @HelperC
; CHECK0: define internal void @HelperD
; CHECK0: define amdgpu_kernel void @A
; CHECK0: define amdgpu_kernel void @B
; CHECK0-NOT: define
; CHECK0: define amdgpu_kernel void @D

; CHECK1-NOT: define
; CHECK1: define internal void @HelperD
; CHECK1: define amdgpu_kernel void @D
; CHECK1-NOT: define
; CHECK1: define internal void @HelperC
; CHECK1: define amdgpu_kernel void @C

; CHECK2-NOT: define
; CHECK2: define hidden void @HelperA
; CHECK2: define hidden void @HelperB
; CHECK2: define hidden void @CallCandidate
; CHECK2: define internal void @HelperC
; CHECK2: define amdgpu_kernel void @C
; CHECK2-NOT: define
; CHECK2: define internal void @HelperD
; CHECK2: define amdgpu_kernel void @A
; CHECK2: define amdgpu_kernel void @B

@addrthief = global [3 x ptr] [ptr @HelperA, ptr @HelperB, ptr @CallCandidate]

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28 changes: 11 additions & 17 deletions llvm/test/tools/llvm-split/AMDGPU/kernels-dependency-overridable.ll
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Original file line number Diff line number Diff line change
@@ -1,21 +1,15 @@
; RUN: llvm-split -o %t %s -j 3 -mtriple amdgcn-amd-amdhsa
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 %s

; CHECK0-NOT: define
; CHECK0: define void @ExternalHelper
; CHECK0: define amdgpu_kernel void @A
; CHECK0: define amdgpu_kernel void @B
; CHECK0-NOT: define

; CHECK1-NOT: define
; CHECK1: define amdgpu_kernel void @D
; CHECK1-NOT: define

; CHECK2-NOT: define
; CHECK2: define amdgpu_kernel void @C
; CHECK2-NOT: define
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 --implicit-check-not=define %s

; CHECK0: define amdgpu_kernel void @D

; CHECK1: define amdgpu_kernel void @C

; CHECK2: define void @ExternalHelper
; CHECK2: define amdgpu_kernel void @A
; CHECK2: define amdgpu_kernel void @B

define void @ExternalHelper() {
ret void
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12 changes: 3 additions & 9 deletions llvm/test/tools/llvm-split/AMDGPU/kernels-global-variables-noexternal.ll
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Original file line number Diff line number Diff line change
@@ -1,26 +1,20 @@
; RUN: llvm-split -o %t %s -j 3 -mtriple amdgcn-amd-amdhsa -amdgpu-module-splitting-no-externalize-globals
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 %s
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 --implicit-check-not=define %s

; 3 kernels use private/internal global variables.
; The GVs should be copied in each partition as needed.

; CHECK0-NOT: define
; CHECK0: @bar = internal constant ptr
; CHECK0: define amdgpu_kernel void @C
; CHECK0-NOT: define

; CHECK1-NOT: define
; CHECK1: @foo = private constant ptr
; CHECK1: define amdgpu_kernel void @A
; CHECK1-NOT: define

; CHECK2-NOT: define
; CHECK2: @foo = private constant ptr
; CHECK2: @bar = internal constant ptr
; CHECK2: define amdgpu_kernel void @B
; CHECK2-NOT: define

@foo = private constant ptr poison
@bar = internal constant ptr poison
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12 changes: 3 additions & 9 deletions llvm/test/tools/llvm-split/AMDGPU/kernels-global-variables.ll
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Original file line number Diff line number Diff line change
@@ -1,28 +1,22 @@
; RUN: llvm-split -o %t %s -j 3 -mtriple amdgcn-amd-amdhsa
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 %s
; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 --implicit-check-not=define %s
; RUN: llvm-dis -o - %t2 | FileCheck --check-prefix=CHECK2 --implicit-check-not=define %s

; 3 kernels use private/internal global variables.
; The GVs should be copied in each partition as needed.

; CHECK0-NOT: define
; CHECK0: @foo = hidden constant ptr poison
; CHECK0: @bar = hidden constant ptr poison
; CHECK0: define amdgpu_kernel void @C
; CHECK0-NOT: define

; CHECK1-NOT: define
; CHECK1: @foo = external hidden constant ptr{{$}}
; CHECK1: @bar = external hidden constant ptr{{$}}
; CHECK1: define amdgpu_kernel void @A
; CHECK1-NOT: define

; CHECK2-NOT: define
; CHECK2: @foo = external hidden constant ptr{{$}}
; CHECK2: @bar = external hidden constant ptr{{$}}
; CHECK2: define amdgpu_kernel void @B
; CHECK2-NOT: define

@foo = private constant ptr poison
@bar = internal constant ptr poison
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