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[AArch64] Dont inline streaming fn into non-streaming caller #150595

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Merged
merged 4 commits into from
Aug 1, 2025
Merged

[AArch64] Dont inline streaming fn into non-streaming caller #150595

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3251573
Precommit test
sdesmalen-arm Jul 24, 2025
4cfce25
[AArch64] Dont inline streaming fn into non-streaming caller
sdesmalen-arm Jul 24, 2025
443e282
Fix tests
sdesmalen-arm Jul 31, 2025
4ca6a64
Update comments in test
sdesmalen-arm Jul 31, 2025
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21 changes: 11 additions & 10 deletions llvm/test/Transforms/Inline/AArch64/sme-pstatesm-attrs-low-threshold.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,8 @@ declare void @streaming_compatible_f() #0 "aarch64_pstate_sm_compatible"

; Function @streaming_callee doesn't contain any operations that may use ZA
; state and therefore can be legally inlined into a normal function.
define void @streaming_callee() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_callee
define void @non_streaming_callee() #0 {
; CHECK-LABEL: define void @non_streaming_callee
; CHECK-SAME: () #[[ATTR1:[0-9]+]] {
; CHECK-NEXT: call void @streaming_compatible_f()
; CHECK-NEXT: call void @streaming_compatible_f()
Expand All @@ -22,24 +22,25 @@ define void @streaming_callee() #0 "aarch64_pstate_sm_enabled" {
}

; Inline call to @streaming_callee to remove a streaming mode change.
define void @non_streaming_caller_inline() #0 {
; CHECK-LABEL: define void @non_streaming_caller_inline
define void @streaming_caller_inline() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_caller_inline
; CHECK-SAME: () #[[ATTR2:[0-9]+]] {
; CHECK-NEXT: call void @streaming_callee()
; CHECK-NEXT: call void @streaming_compatible_f()
; CHECK-NEXT: call void @streaming_compatible_f()
; CHECK-NEXT: ret void
;
call void @streaming_callee()
call void @non_streaming_callee()
ret void
}

; Don't inline call to @streaming_callee when the inline-threshold is set to 1, because it does not eliminate a streaming-mode change.
define void @streaming_caller_dont_inline() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_caller_dont_inline
define void @non_streaming_caller_dont_inline() #0 {
; CHECK-LABEL: define void @non_streaming_caller_dont_inline
; CHECK-SAME: () #[[ATTR1]] {
; CHECK-NEXT: call void @streaming_callee()
; CHECK-NEXT: call void @non_streaming_callee()
; CHECK-NEXT: ret void
;
call void @streaming_callee()
call void @non_streaming_callee()
ret void
}

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83 changes: 42 additions & 41 deletions llvm/test/Transforms/Inline/AArch64/sme-pstatesm-attrs.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -583,67 +583,67 @@ entry:



declare void @streaming_body() "aarch64_pstate_sm_enabled"
declare void @nonstreaming_body()

define void @streaming_caller_single_streaming_callee() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_caller_single_streaming_callee
; CHECK-SAME: () #[[ATTR2]] {
; CHECK-NEXT: call void @streaming_body()
define void @nonstreaming_caller_single_nonstreaming_callee() #0 {
; CHECK-LABEL: define void @nonstreaming_caller_single_nonstreaming_callee
; CHECK-SAME: () #[[ATTR1]] {
; CHECK-NEXT: call void @nonstreaming_body()
; CHECK-NEXT: ret void
;
call void @streaming_body()
call void @nonstreaming_body()
ret void
}

define void @streaming_caller_multiple_streaming_callees() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_caller_multiple_streaming_callees
; CHECK-SAME: () #[[ATTR2]] {
; CHECK-NEXT: call void @streaming_body()
; CHECK-NEXT: call void @streaming_body()
define void @nonstreaming_caller_multiple_nonstreaming_callees() #0 {
; CHECK-LABEL: define void @nonstreaming_caller_multiple_nonstreaming_callees
; CHECK-SAME: () #[[ATTR1]] {
; CHECK-NEXT: call void @nonstreaming_body()
; CHECK-NEXT: call void @nonstreaming_body()
; CHECK-NEXT: ret void
;
call void @streaming_body()
call void @streaming_body()
call void @nonstreaming_body()
call void @nonstreaming_body()
ret void
}

; Allow inlining, as inline it would not increase the number of streaming-mode changes.
define void @streaming_caller_single_streaming_callee_inline() #0 {
; CHECK-LABEL: define void @streaming_caller_single_streaming_callee_inline
; CHECK-SAME: () #[[ATTR1]] {
; CHECK-NEXT: call void @streaming_caller_single_streaming_callee()
define void @streaming_caller_to_nonstreaming_callee_with_single_nonstreaming_callee_inline() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_caller_to_nonstreaming_callee_with_single_nonstreaming_callee_inline
; CHECK-SAME: () #[[ATTR2]] {
; CHECK-NEXT: call void @nonstreaming_body()
; CHECK-NEXT: ret void
;
call void @streaming_caller_single_streaming_callee()
call void @nonstreaming_caller_single_nonstreaming_callee()
ret void
}

; Prevent inlining, as inline it would lead to multiple streaming-mode changes.
define void @streaming_caller_multiple_streaming_callees_dont_inline() #0 {
; CHECK-LABEL: define void @streaming_caller_multiple_streaming_callees_dont_inline
; CHECK-SAME: () #[[ATTR1]] {
; CHECK-NEXT: call void @streaming_caller_multiple_streaming_callees()
; Prevent inlining, as inlining it would lead to multiple streaming-mode changes.
define void @streaming_caller_to_nonstreaming_callee_with_multiple_nonstreaming_callees_dont_inline() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_caller_to_nonstreaming_callee_with_multiple_nonstreaming_callees_dont_inline
; CHECK-SAME: () #[[ATTR2]] {
; CHECK-NEXT: call void @streaming_caller_to_nonstreaming_callee_with_multiple_nonstreaming_callees_dont_inline()
; CHECK-NEXT: ret void
;
call void @streaming_caller_multiple_streaming_callees()
call void @streaming_caller_to_nonstreaming_callee_with_multiple_nonstreaming_callees_dont_inline()
ret void
}

declare void @streaming_compatible_body() "aarch64_pstate_sm_compatible"

define void @streaming_caller_single_streaming_compatible_callee() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_caller_single_streaming_compatible_callee
; CHECK-SAME: () #[[ATTR2]] {
define void @nonstreaming_caller_single_streaming_compatible_callee() #0 {
; CHECK-LABEL: define void @nonstreaming_caller_single_streaming_compatible_callee
; CHECK-SAME: () #[[ATTR1]] {
; CHECK-NEXT: call void @streaming_compatible_body()
; CHECK-NEXT: ret void
;
call void @streaming_compatible_body()
ret void
}

define void @streaming_caller_multiple_streaming_compatible_callees() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_caller_multiple_streaming_compatible_callees
; CHECK-SAME: () #[[ATTR2]] {
define void @nonstreaming_caller_multiple_streaming_compatible_callees() #0 {
; CHECK-LABEL: define void @nonstreaming_caller_multiple_streaming_compatible_callees
; CHECK-SAME: () #[[ATTR1]] {
; CHECK-NEXT: call void @streaming_compatible_body()
; CHECK-NEXT: call void @streaming_compatible_body()
; CHECK-NEXT: ret void
Expand All @@ -654,24 +654,25 @@ define void @streaming_caller_multiple_streaming_compatible_callees() #0 "aarch
}

; Allow inlining, as inline would remove a streaming-mode change.
define void @streaming_caller_single_streaming_compatible_callee_inline() #0 {
; CHECK-LABEL: define void @streaming_caller_single_streaming_compatible_callee_inline
; CHECK-SAME: () #[[ATTR1]] {
; CHECK-NEXT: call void @streaming_caller_single_streaming_compatible_callee()
define void @streaming_caller_to_nonstreaming_callee_with_single_streamingcompatible_callee_inline() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_caller_to_nonstreaming_callee_with_single_streamingcompatible_callee_inline
; CHECK-SAME: () #[[ATTR2]] {
; CHECK-NEXT: call void @streaming_compatible_body()
; CHECK-NEXT: ret void
;
call void @streaming_caller_single_streaming_compatible_callee()
call void @nonstreaming_caller_single_streaming_compatible_callee()
ret void
}

; Allow inlining, as inline would remove several stremaing-mode changes.
define void @streaming_caller_multiple_streaming_compatible_callees_inline() #0 {
; CHECK-LABEL: define void @streaming_caller_multiple_streaming_compatible_callees_inline
; CHECK-SAME: () #[[ATTR1]] {
; CHECK-NEXT: call void @streaming_caller_multiple_streaming_compatible_callees()
; Allow inlining, as inline would remove several streaming-mode changes.
define void @streaming_caller_to_nonstreaming_callee_with_multiple_streamingcompatible_callees_inline() #0 "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define void @streaming_caller_to_nonstreaming_callee_with_multiple_streamingcompatible_callees_inline
; CHECK-SAME: () #[[ATTR2]] {
; CHECK-NEXT: call void @streaming_compatible_body()
; CHECK-NEXT: call void @streaming_compatible_body()
; CHECK-NEXT: ret void
;
call void @streaming_caller_multiple_streaming_compatible_callees()
call void @nonstreaming_caller_multiple_streaming_compatible_callees()
ret void
}

Expand Down