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[AArch64] Set the default streaming hazard size to 1024 for +sme,+sve #123753

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Jan 22, 2025
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[AArch64] Set the default streaming hazard size to 1024 for +sme,+sve #123753

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70345f5
[AArch64] Set the default streaming hazard size to 1024 for +sme,+sve
MacDue Jan 20, 2025
0cc39d8
Fixups
MacDue Jan 21, 2025
bd27de7
Update llvm/lib/Target/AArch64/AArch64Subtarget.h
MacDue Jan 21, 2025
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5 changes: 4 additions & 1 deletion llvm/lib/Target/AArch64/AArch64Subtarget.cpp
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Expand Up @@ -358,7 +358,10 @@ AArch64Subtarget::AArch64Subtarget(const Triple &TT, StringRef CPU,
CustomCallSavedXRegs(AArch64::GPR64commonRegClass.getNumRegs()),
IsLittle(LittleEndian), IsStreaming(IsStreaming),
IsStreamingCompatible(IsStreamingCompatible),
StreamingHazardSize(AArch64StreamingHazardSize),
StreamingHazardSize(
AArch64StreamingHazardSize.getNumOccurrences() > 0
? std::optional<unsigned>(AArch64StreamingHazardSize)
: std::nullopt),
MinSVEVectorSizeInBits(MinSVEVectorSizeInBitsOverride),
MaxSVEVectorSizeInBits(MaxSVEVectorSizeInBitsOverride), TargetTriple(TT),
InstrInfo(initializeSubtargetDependencies(FS, CPU, TuneCPU, HasMinSize)),
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9 changes: 7 additions & 2 deletions llvm/lib/Target/AArch64/AArch64Subtarget.h
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Expand Up @@ -85,7 +85,7 @@ class AArch64Subtarget final : public AArch64GenSubtargetInfo {

bool IsStreaming;
bool IsStreamingCompatible;
unsigned StreamingHazardSize;
std::optional<unsigned> StreamingHazardSize;
unsigned MinSVEVectorSizeInBits;
unsigned MaxSVEVectorSizeInBits;
unsigned VScaleForTuning = 1;
Expand Down Expand Up @@ -179,7 +179,12 @@ class AArch64Subtarget final : public AArch64GenSubtargetInfo {

/// Returns the size of memory region that if accessed by both the CPU and
/// the SME unit could result in a hazard. 0 = disabled.
unsigned getStreamingHazardSize() const { return StreamingHazardSize; }
unsigned getStreamingHazardSize() const {
// If StreamingHazardSize has been explicitly set to a value, use that.
// Otherwise, default to 1024 bytes when both SME and SVE are available,
// for all other configurations default to no streaming hazards.
return StreamingHazardSize.value_or(hasSME() && hasSVE() ? 1024 : 0);
}

/// Returns true if the target has NEON and the function at runtime is known
/// to have NEON enabled (e.g. the function is known not to be in streaming-SVE
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4 changes: 2 additions & 2 deletions llvm/test/CodeGen/AArch64/outlining-with-streaming-mode-changes.ll
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@@ -1,5 +1,5 @@
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 -enable-machine-outliner -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 -enable-machine-outliner -verify-machineinstrs < %s | FileCheck %s -check-prefix=OUTLINER
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 -enable-machine-outliner -aarch64-streaming-hazard-size=0 -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 -enable-machine-outliner -aarch64-streaming-hazard-size=0 -verify-machineinstrs < %s | FileCheck %s -check-prefix=OUTLINER

declare void @callee();

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6 changes: 3 additions & 3 deletions llvm/test/CodeGen/AArch64/sme-callee-save-restore-pairs.ll
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@@ -1,7 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sme2 -mattr=+sve -aarch64-disable-multivector-spill-fill -verify-machineinstrs < %s | FileCheck %s --check-prefixes=NOPAIR
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sme -mattr=+sve -verify-machineinstrs < %s | FileCheck %s --check-prefixes=NOPAIR
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sme2 -mattr=+sve -verify-machineinstrs < %s | FileCheck %s --check-prefixes=PAIR
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sme2 -mattr=+sve -aarch64-disable-multivector-spill-fill -verify-machineinstrs < %s | FileCheck %s --check-prefixes=NOPAIR
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sme -mattr=+sve -verify-machineinstrs < %s | FileCheck %s --check-prefixes=NOPAIR
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sme2 -mattr=+sve -verify-machineinstrs < %s | FileCheck %s --check-prefixes=PAIR

declare void @my_func()
declare void @my_func2(<vscale x 16 x i8> %v)
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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/sme-darwin-sve-vg.ll
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@@ -1,4 +1,4 @@
; RUN: llc -mtriple=aarch64-darwin -mattr=+sve -mattr=+sme -enable-aarch64-sme-peephole-opt=false -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -mtriple=aarch64-darwin -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme -enable-aarch64-sme-peephole-opt=false -verify-machineinstrs < %s | FileCheck %s

declare void @normal_callee();

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4 changes: 2 additions & 2 deletions llvm/test/CodeGen/AArch64/sme-disable-gisel-fisel.ll
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@@ -1,7 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -fast-isel=true -global-isel=false -fast-isel-abort=0 -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 < %s \
; RUN: llc -fast-isel=true -aarch64-streaming-hazard-size=0 -global-isel=false -fast-isel-abort=0 -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 < %s \
; RUN: | FileCheck %s --check-prefixes=CHECK-COMMON,CHECK-FISEL
; RUN: llc -fast-isel=false -global-isel=true -global-isel-abort=0 -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 < %s \
; RUN: llc -fast-isel=false -aarch64-streaming-hazard-size=0 -global-isel=true -global-isel-abort=0 -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 < %s \
; RUN: | FileCheck %s --check-prefixes=CHECK-COMMON,CHECK-GISEL


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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/sme-lazy-save-call.ll
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@@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64 -mattr=+sve -mattr=+sme < %s | FileCheck %s
; RUN: llc -mtriple=aarch64 -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme < %s | FileCheck %s

declare void @private_za_callee()
declare float @llvm.cos.f32(float)
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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/sme-peephole-opts.ll
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@@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve,+sme2 < %s | FileCheck %s
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve,+sme2 < %s | FileCheck %s

declare void @callee()
declare void @callee_farg(float)
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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/sme-pstate-sm-changing-call-disable-coalescing.ll
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@@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
; RUN: llc < %s | FileCheck %s
; RUN: llc -aarch64-streaming-hazard-size=0 < %s | FileCheck %s

target triple = "aarch64-unknown-unknown-eabi-elf"

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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/sme-streaming-body-streaming-compatible-interface.ll
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@@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme -start-after=simplifycfg -enable-tail-merge=false -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme -start-after=simplifycfg -enable-tail-merge=false -verify-machineinstrs < %s | FileCheck %s

declare void @normal_callee();
declare void @streaming_callee() "aarch64_pstate_sm_enabled";
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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/sme-streaming-body.ll
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@@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme -start-after=simplifycfg -enable-tail-merge=false -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme -start-after=simplifycfg -enable-tail-merge=false -verify-machineinstrs < %s | FileCheck %s

declare void @normal_callee();
declare void @streaming_callee() "aarch64_pstate_sm_enabled";
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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/sme-streaming-compatible-interface.ll
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@@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -verify-machineinstrs -mattr=+sve -mattr=+sme < %s | FileCheck %s
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -verify-machineinstrs -mattr=+sve -mattr=+sme < %s | FileCheck %s

; This file tests the following combinations related to streaming-enabled functions:
; [ ] N -> SC (Normal -> Streaming-compatible)
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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/sme-streaming-interface.ll
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@@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme -verify-machineinstrs < %s | FileCheck %s

; This file tests the following combinations related to streaming-enabled functions:
; [ ] N -> S (Normal -> Streaming)
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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/AArch64/sme-streaming-mode-changing-call-disable-stackslot-scavenging.ll
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@@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
; RUN: llc < %s | FileCheck %s
; RUN: llc -aarch64-streaming-hazard-size=0 < %s | FileCheck %s

target triple = "aarch64"

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6 changes: 3 additions & 3 deletions llvm/test/CodeGen/AArch64/sme-vg-to-stack.ll
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@@ -1,7 +1,7 @@
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 -frame-pointer=non-leaf -verify-machineinstrs < %s | FileCheck %s --check-prefix=FP-CHECK
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme2 -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme2 -frame-pointer=non-leaf -verify-machineinstrs < %s | FileCheck %s --check-prefix=FP-CHECK
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sme2 -frame-pointer=non-leaf -verify-machineinstrs < %s | FileCheck %s --check-prefix=NO-SVE-CHECK
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 -verify-machineinstrs -enable-machine-outliner < %s | FileCheck %s --check-prefix=OUTLINER-CHECK
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme2 -verify-machineinstrs -enable-machine-outliner < %s | FileCheck %s --check-prefix=OUTLINER-CHECK

declare void @callee();
declare void @fixed_callee(<4 x i32>);
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54 changes: 54 additions & 0 deletions llvm/test/CodeGen/AArch64/stack-hazard-defaults.ll
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@@ -0,0 +1,54 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc < %s -mtriple=aarch64 -mattr=+sme -aarch64-stack-hazard-size=0 | FileCheck %s --check-prefix=CHECK0
; RUN: llc < %s -mtriple=aarch64 -mattr=+sme -aarch64-stack-hazard-size=1024 | FileCheck %s --check-prefix=CHECK1024

;; The following run lines check the default values for aarch64-stack-hazard-size/aarch64-streaming-hazard-size.

;; When +sme,+sve is set the hazard size should default to 1024.
; RUN: llc < %s -mtriple=aarch64 -mattr=+sme -mattr=+sve | FileCheck %s --check-prefix=CHECK1024

;; The hazard size can still be overridden/disabled when +sme,+sve is set.
; RUN: llc < %s -mtriple=aarch64 -mattr=+sme -mattr=+sve -aarch64-stack-hazard-size=0 | FileCheck %s --check-prefix=CHECK0

;; When +sme is set (without +sve) the default hazard size should be 0.
; RUN: llc < %s -mtriple=aarch64 -mattr=+sme | FileCheck %s --check-prefix=CHECK0

define i32 @spill_fpr_with_gpr_stack_object(i64 %d) "aarch64_pstate_sm_compatible" {
; CHECK0-LABEL: spill_fpr_with_gpr_stack_object:
; CHECK0: // %bb.0: // %entry
; CHECK0-NEXT: str d8, [sp, #-16]! // 8-byte Folded Spill
; CHECK0-NEXT: .cfi_def_cfa_offset 16
; CHECK0-NEXT: .cfi_offset b8, -16
; CHECK0-NEXT: mov x8, x0
; CHECK0-NEXT: mov w0, wzr
; CHECK0-NEXT: //APP
; CHECK0-NEXT: //NO_APP
; CHECK0-NEXT: str x8, [sp, #8]
; CHECK0-NEXT: ldr d8, [sp], #16 // 8-byte Folded Reload
; CHECK0-NEXT: ret
;
; CHECK1024-LABEL: spill_fpr_with_gpr_stack_object:
; CHECK1024: // %bb.0: // %entry
; CHECK1024-NEXT: sub sp, sp, #1040
; CHECK1024-NEXT: str d8, [sp] // 8-byte Folded Spill
; CHECK1024-NEXT: str x29, [sp, #1032] // 8-byte Folded Spill
; CHECK1024-NEXT: sub sp, sp, #1040
; CHECK1024-NEXT: .cfi_def_cfa_offset 2080
; CHECK1024-NEXT: .cfi_offset w29, -8
; CHECK1024-NEXT: .cfi_offset b8, -1040
; CHECK1024-NEXT: mov x8, x0
; CHECK1024-NEXT: mov w0, wzr
; CHECK1024-NEXT: //APP
; CHECK1024-NEXT: //NO_APP
; CHECK1024-NEXT: str x8, [sp, #8]
; CHECK1024-NEXT: add sp, sp, #1040
; CHECK1024-NEXT: ldr x29, [sp, #1032] // 8-byte Folded Reload
; CHECK1024-NEXT: ldr d8, [sp] // 8-byte Folded Reload
; CHECK1024-NEXT: add sp, sp, #1040
; CHECK1024-NEXT: ret
entry:
%a = alloca i64
tail call void asm sideeffect "", "~{d8}"() #1
store i64 %d, ptr %a
ret i32 0
}
6 changes: 3 additions & 3 deletions llvm/test/CodeGen/AArch64/streaming-compatible-memory-ops.ll
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@@ -1,7 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 -verify-machineinstrs < %s | FileCheck %s -check-prefixes=CHECK
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 -verify-machineinstrs -aarch64-lower-to-sme-routines=false < %s | FileCheck %s -check-prefixes=CHECK-NO-SME-ROUTINES
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve -mattr=+sme2 -mattr=+mops -verify-machineinstrs < %s | FileCheck %s -check-prefixes=CHECK-MOPS
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme2 -verify-machineinstrs < %s | FileCheck %s -check-prefixes=CHECK
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme2 -verify-machineinstrs -aarch64-lower-to-sme-routines=false < %s | FileCheck %s -check-prefixes=CHECK-NO-SME-ROUTINES
; RUN: llc -mtriple=aarch64-linux-gnu -aarch64-streaming-hazard-size=0 -mattr=+sve -mattr=+sme2 -mattr=+mops -verify-machineinstrs < %s | FileCheck %s -check-prefixes=CHECK-MOPS

@dst = global [512 x i8] zeroinitializer, align 1
@src = global [512 x i8] zeroinitializer, align 1
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4 changes: 2 additions & 2 deletions llvm/test/CodeGen/AArch64/sve-stack-frame-layout.ll
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@@ -1,6 +1,6 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc < %s -mtriple=aarch64 -mattr=+sve2 | FileCheck %s --check-prefixes=CHECK
; RUN: llc < %s -mtriple=aarch64 -mattr=+sve2 -pass-remarks-analysis=stack-frame-layout 2>&1 >/dev/null | FileCheck %s --check-prefixes=CHECK-FRAMELAYOUT
; RUN: llc < %s -mtriple=aarch64 -mattr=+sve2 -aarch64-streaming-hazard-size=0 | FileCheck %s --check-prefixes=CHECK
; RUN: llc < %s -mtriple=aarch64 -mattr=+sve2 -aarch64-streaming-hazard-size=0 -pass-remarks-analysis=stack-frame-layout 2>&1 >/dev/null | FileCheck %s --check-prefixes=CHECK-FRAMELAYOUT

; CHECK-FRAMELAYOUT-LABEL: Function: csr_d8_allocnxv4i32i32f64
; CHECK-FRAMELAYOUT-NEXT: Offset: [SP-8], Type: Spill, Align: 8, Size: 8
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