[llvm-branch-commits] [clang] [clang-tools-extra] [compiler-rt] [flang] [libc] [libcxx] [lldb] [llvm] [LV] Reduce register usage for scaled reductions (PR #133090)
Sam Tebbs via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Wed Apr 9 07:17:36 PDT 2025
Valentin Clement =?utf-8?b?KOODkOODrOODsw=?=,zcfh <1412805291 at qq.com>,Alexey
Bataev <a.bataev at outlook.com>,Florian Hahn <flo at fhahn.com>,Alexey Bataev
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Trofin <mtrofin at google.com>,Florian Hahn <flo at fhahn.com>,Jonas Devlieghere
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<rjoshi at nvidia.com>,Matt Arsenault <Matthew.Arsenault at amd.com>,Matt
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Cardoso Lopes <bruno.cardoso at gmail.com>,Rahul Joshi <rjoshi at nvidia.com>,Rahul
Joshi <rjoshi at nvidia.com>,Rahul Joshi <rjoshi at nvidia.com>,
Valentin Clement =?utf-8?b?KOODkOODrOODsw=?=,Matt Arsenault
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Green <david.green at arm.com>,David Green <david.green at arm.com>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>,Tom Eccles
<tom.eccles at arm.com>,Tom Eccles <tom.eccles at arm.com>,Jakub Ficek
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Nathan =?utf-8?q?Gauër?= <brioche at google.com>,Nikolas Klauser
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Li <me at alanli.org>,Christopher McGirr
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Dang <thurston at google.com>,Dmitry Chestnykh <dm.chestnykh at gmail.com>,Simon
Pilgrim <llvm-dev at redking.me.uk>,Stephen Tozer <stephen.tozer at sony.com>,Jacob
Lalonde <jalalonde at fb.com>,Adrian Prantl <aprantl at apple.com>,k-kashapov
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Valentin Clement =?utf-8?b?KOODkOODrOODsw=?=,Matthias Springer <me at m-sp.org>,Min-Yih
Hsu <min.hsu at sifive.com>,$x3 = ADDXrr $x0, $x0,Andy Kaylor
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<yijiagu at google.com>,cmtice <cmtice at google.com>,Alexandre Ganea
<alex_toresh at yahoo.fr>,Alexandre Ganea <alex_toresh at yahoo.fr>,Alexandre
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<llvm-dev at redking.me.uk>,Samuel Tebbs <samuel.tebbs at arm.com>,Samuel Tebbs
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<samuel.tebbs at arm.com>,Samuel Tebbs <samuel.tebbs at arm.com>,Samuel Tebbs
<samuel.tebbs at arm.com>,Samuel Tebbs <samuel.tebbs at arm.com>,Sam Tebbs
<samuel.tebbs at arm.com>,Sam Tebbs <samuel.tebbs at arm.com>,Sam Tebbs
<samuel.tebbs at arm.com>,Samuel Tebbs <samuel.tebbs at arm.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/133090 at github.com>
================
@@ -5039,10 +5039,26 @@ calculateRegisterUsage(VPlan &Plan, ArrayRef<ElementCount> VFs,
// even in the scalar case.
RegUsage[ClassID] += 1;
} else {
+ ElementCount VF = VFs[J];
+ // The output from scaled phis and scaled reductions actually has
+ // fewer lanes than the VF.
+ if (isa<VPPartialReductionRecipe, VPReductionPHIRecipe>(R)) {
+ auto *ReductionR = dyn_cast<VPReductionPHIRecipe>(R);
+ auto *PartialReductionR = ReductionR ? nullptr : dyn_cast<VPPartialReductionRecipe>(R);
+ unsigned ScaleFactor = ReductionR ? ReductionR->getVFScaleFactor() : PartialReductionR->getVFScaleFactor();
+ VF = VF.divideCoefficientBy(ScaleFactor);
+ }
----------------
SamTebbs33 wrote:
Done.
https://github.com/llvm/llvm-project/pull/133090
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