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[LoopVectorizer][AArch64] Add a -sve-vscale-for-tuning override option. #156916

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Merged
davemgreen merged 2 commits into from
Sep 9, 2025
Merged

[LoopVectorizer][AArch64] Add a -sve-vscale-for-tuning override option. #156916

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fb034f0
[LoopVectorizer] Add a -force-vscale-for-tuning override option.
davemgreen Sep 4, 2025
bccc85b
Move to AArch64
davemgreen Sep 8, 2025
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6 changes: 6 additions & 0 deletions llvm/lib/Target/AArch64/AArch64Subtarget.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -91,6 +91,10 @@ static cl::opt<bool> EnableZPRPredicateSpills(
cl::desc(
"Enables spilling/reloading SVE predicates as data vectors (ZPRs)"));

static cl::opt<unsigned>
VScaleForTuningOpt("sve-vscale-for-tuning", cl::Hidden,
cl::desc("Force a vscale for tuning factor for SVE"));

// Subreg liveness tracking is disabled by default for now until all issues
// are ironed out. This option allows the feature to be used in tests.
static cl::opt<bool>
Expand Down Expand Up @@ -364,6 +368,8 @@ void AArch64Subtarget::initializeProperties(bool HasMinSize) {

if (AArch64MinimumJumpTableEntries.getNumOccurrences() > 0 || !HasMinSize)
MinimumJumpTableEntries = AArch64MinimumJumpTableEntries;
if (VScaleForTuningOpt.getNumOccurrences() > 0)
VScaleForTuning = VScaleForTuningOpt;
}

AArch64Subtarget::AArch64Subtarget(const Triple &TT, StringRef CPU,
Expand Down
4 changes: 4 additions & 0 deletions llvm/test/Transforms/LoopVectorize/AArch64/scalable-vectorization-cost-tuning.ll
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Expand Up @@ -7,6 +7,10 @@
; RUN: -force-target-instruction-cost=1 -passes=loop-vectorize -S -debug-only=loop-vectorize --disable-output < %s 2>&1 \
; RUN: | FileCheck %s --check-prefixes=VSCALEFORTUNING1

; RUN: opt -mtriple=aarch64 -mattr=+sve -mcpu=generic -sve-vscale-for-tuning=2 \
; RUN: -force-target-instruction-cost=1 -passes=loop-vectorize -S -debug-only=loop-vectorize --disable-output < %s 2>&1 \
; RUN: | FileCheck %s --check-prefixes=VSCALEFORTUNING2

; RUN: opt -mtriple=aarch64 -mcpu=neoverse-v1 \
; RUN: -force-target-instruction-cost=1 -passes=loop-vectorize -S -debug-only=loop-vectorize --disable-output < %s 2>&1 \
; RUN: | FileCheck %s --check-prefixes=VSCALEFORTUNING2
Expand Down