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@@ -8,14 +8,14 @@ typedef float v4sf __attribute__ ((__vector_size__ (16)));
typedef double v4df __attribute__ ((__vector_size__ (32)));
typedef int v4i32 __attribute__ ((__vector_size__ (16)));
-// O32-LABEL: define{{.*}} void @test_v4sf(ptr dead_on_unwind noalias
nocapture
Author: Nikita Popov
Date: 2025-01-20T12:41:02+01:00
New Revision: a4d9a8de0820f3ccc2eb35870cac199e8dacd9e6
URL:
https://github.com/llvm/llvm-project/commit/a4d9a8de0820f3ccc2eb35870cac199e8dacd9e6
DIFF:
https://github.com/llvm/llvm-project/commit/a4d9a8de0820f3ccc2eb35870cac199e8dacd9e6.diff
Author: Nikita Popov
Date: 2025-01-20T12:46:37+01:00
New Revision: a79ae862ab2999cad89879743335423b985ae3fd
URL:
https://github.com/llvm/llvm-project/commit/a79ae862ab2999cad89879743335423b985ae3fd
DIFF:
https://github.com/llvm/llvm-project/commit/a79ae862ab2999cad89879743335423b985ae3fd.diff
@@ -8,14 +8,14 @@ typedef float v4sf __attribute__ ((__vector_size__ (16)));
typedef double v4df __attribute__ ((__vector_size__ (32)));
typedef int v4i32 __attribute__ ((__vector_size__ (16)));
-// O32-LABEL: define{{.*}} void @test_v4sf(ptr dead_on_unwind noalias
nocapture
https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/123445
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https://github.com/llvm/llvm-project/pull/123444
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https://github.com/llvm/llvm-project/pull/124447
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https://github.com/nikic updated
https://github.com/llvm/llvm-project/pull/122486
>From 925f74cad21eb6c46514d1ae543ac202073baf27 Mon Sep 17 00:00:00 2001
From: Nikita Popov
Date: Fri, 10 Jan 2025 17:01:07 +0100
Subject: [PATCH 1/5] [Clang] Add -fwrapv-pointer flag
GCC supports three flags rela
https://github.com/nikic commented:
Can't this use DenseSet? It looks like the names here live for the
lifetime of the set.
https://github.com/llvm/llvm-project/pull/124448
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https://github.com/llvm/llvm-project/pull/124425
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nikic wrote:
FYI this change has some measurable compile-time overhead (about 0.2% for debug
builds):
https://llvm-compile-time-tracker.com/compare.php?from=eaa5897534cbd263d0cdbf780f72133c2fe8d8d4&to=561132e71b29d9b747dfda1509f715847852f77b&stat=instructions:u
Not sure whether that's expected
nikic wrote:
FYI this one seems like a fairly substantial compile-time regression for C++
code:
https://llvm-compile-time-tracker.com/compare_clang.php?from=ad9da92cf6f735747ef04fd56937e1d76819e503&to=5815a311050ae218ebcda53adeee24ed96851943&stat=instructions%3Au&sortBy=interestingness
https:/
https://github.com/nikic closed https://github.com/llvm/llvm-project/pull/122486
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nikic wrote:
It looks like one of the header changes here is expensive, adding 0.5% to the
time to build clang. Per-file breakdown:
https://llvm-compile-time-tracker.com/compare_clang.php?from=aab25f20f6c06bab7aac6fb83d54705ec4cdfadd&to=0865ecc5150b9a55ba1f9e30b6d463a66ac362a6&stat=instructions
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https://github.com/llvm/llvm-project/pull/124882
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@@ -1015,7 +1015,7 @@ struct OperandBundleUse {
/// has the attribute A.
bool operandHasAttr(unsigned Idx, Attribute::AttrKind A) const {
if (isDeoptOperandBundle())
- if (A == Attribute::ReadOnly || A == Attribute::NoCapture)
nikic wrote:
Yes.
h
@@ -526,6 +526,11 @@ static AttributeSet
getIntrinsicArgAttributeSet(LLVMContext &C, unsigned ID) {
)",
ID);
for (const CodeGenIntrinsic::ArgAttribute &Attr : Attrs) {
+if (Attr.Kind == CodeGenIntrinsic::NoCapture) {
nikic wro
nikic wrote:
Thanks for the reviews! I plan to land this after LLVM 20 branches next week,
to avoid unnecessary last-minute disruption for the release.
https://github.com/llvm/llvm-project/pull/123181
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@@ -8,14 +8,14 @@ typedef float v4sf __attribute__ ((__vector_size__ (16)));
typedef double v4df __attribute__ ((__vector_size__ (32)));
typedef int v4i32 __attribute__ ((__vector_size__ (16)));
-// O32-LABEL: define{{.*}} void @test_v4sf(ptr dead_on_unwind noalias
nocapture
https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/123890
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https://github.com/llvm/llvm-project/pull/125023
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@@ -2009,7 +2009,8 @@ class ClassTemplateSpecializationDecl : public
CXXRecordDecl,
/// Retrieve the template argument list as written in the sources,
/// if any.
const ASTTemplateArgumentListInfo *getTemplateArgsAsWritten() const {
-if (auto *Info = ExplicitInfo.dyn
@@ -1391,7 +1391,9 @@ class DeclContextLookupResult {
const_iterator end() const { return iterator(); }
bool empty() const { return Result.isNull(); }
- bool isSingleResult() const { return Result.dyn_cast(); }
+ bool isSingleResult() const {
+return dyn_cast_if_pre
@@ -885,18 +885,18 @@ class Preprocessor {
}
~MacroState() {
- if (auto *Info = State.dyn_cast())
+ if (auto *Info = dyn_cast_if_present(State))
Info->~ModuleMacroInfo();
}
MacroDirective *getLatest() const {
- if (auto *Info = State
@@ -2009,7 +2009,8 @@ class ClassTemplateSpecializationDecl : public
CXXRecordDecl,
/// Retrieve the template argument list as written in the sources,
/// if any.
const ASTTemplateArgumentListInfo *getTemplateArgsAsWritten() const {
-if (auto *Info = ExplicitInfo.dyn
https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/124434
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nikic wrote:
> Literal migration would result in dyn_cast_if_present (see the definition of
> PointerUnion::dyn_cast), but this patch uses dyn_cast because we expect
> Prototype.P to be nonnull.
This comment doesn't seem to match the PR :)
https://github.com/llvm/llvm-project/pull/122653
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https://github.com/llvm/llvm-project/pull/122778
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https://github.com/nikic updated
https://github.com/llvm/llvm-project/pull/122462
>From 6940157fa4b9c186f45b98206311b12ab78c40ff Mon Sep 17 00:00:00 2001
From: Nikita Popov
Date: Fri, 10 Jan 2025 15:14:44 +0100
Subject: [PATCH 1/2] [Clang] Add release note for pointer overflow
optimization cha
@@ -58,6 +58,26 @@ code bases.
containing strict-aliasing violations. The new default behavior can be
disabled using ``-fno-pointer-tbaa``.
+- Clang will now more aggressively use undefined behavior on pointer addition
+ overflow for optimization purposes. For example, a
nikic wrote:
> I'm tempted to say we should just treat
> -fwrapv/-fwrapv-pointer/-fno-strict-overflow as aliases for each other. I
> don't think anyone using -fwrapv is going to be happy that we're turning on
> overflow optimizations.
Yeah, I'm not entirely sure this change is worthwhile eith
https://github.com/nikic commented:
> Literal migration would result in dyn_cast_if_present (see the
> definition of PointerUnion::dyn_cast), but this patch uses dyn_cast
> because we expect Source to be nonnull.
You are still using dyn_cast_if_present :)
https://github.com/llvm/llvm-project/pu
https://github.com/nikic commented:
This one also uses dyn_cast_if_present.
https://github.com/llvm/llvm-project/pull/122856
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https://github.com/nikic approved this pull request.
LGTM
https://github.com/llvm/llvm-project/pull/118309
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nikic wrote:
Compile-time looks fine on this one:
https://llvm-compile-time-tracker.com/compare.php?from=8fb29ba287d72392bd7900c33d2a8d2149126dbe&to=fd734a392a094a573ee7fe587b9fc5f616f92a9a&stat=instructions:u
https://github.com/llvm/llvm-project/pull/123152
nikic wrote:
Thanks for the context! "I'm landing this without approval because I'm the
maintainer for this component" is a lot less scary than "I'm landing this
without approval because there's no time to wait on a review".
https://github.com/llvm/llvm-project/pull/122887
https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/123158
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nikic wrote:
I'm concerned about the soundness of our current implementation for these
assumptions, see my comment at
https://github.com/llvm/llvm-project/pull/120962#issuecomment-2582864870. Not
sure we should be exposing the current implementation from clang.
https://github.com/llvm/llvm-pr
@@ -58,6 +58,26 @@ code bases.
containing strict-aliasing violations. The new default behavior can be
disabled using ``-fno-pointer-tbaa``.
+- Clang will now more aggressively use undefined behavior on pointer addition
+ overflow for optimization purposes. For example, a
https://github.com/nikic created
https://github.com/llvm/llvm-project/pull/122462
Add a release note for optimization change related to pointer overflow checks.
I've put this in the breaking changes section to give it the best chance of
being seen.
>From 6940157fa4b9c186f45b98206311b12ab78c40
https://github.com/nikic created
https://github.com/llvm/llvm-project/pull/122486
GCC supports three flags related to overflow behavior:
* `-fwrapv`: Makes signed integer overflow well-defined.
* `-fwrapv-pointer`: Makes pointer overflow well-defined.
* `-fno-strict-overflow`: Implies `-fwrap
https://github.com/nikic updated
https://github.com/llvm/llvm-project/pull/122486
>From 1f3737d2eeb7681cb57a66f7bd6c4614cd038aac Mon Sep 17 00:00:00 2001
From: Nikita Popov
Date: Fri, 10 Jan 2025 17:01:07 +0100
Subject: [PATCH] [Clang] Add -fwrapv-pointer flag
GCC supports three flags related
https://github.com/nikic updated
https://github.com/llvm/llvm-project/pull/122486
>From b8c7a369fffecc9d1811d286fb1536346045fb74 Mon Sep 17 00:00:00 2001
From: Nikita Popov
Date: Fri, 10 Jan 2025 17:01:07 +0100
Subject: [PATCH] [Clang] Add -fwrapv-pointer flag
GCC supports three flags related
https://github.com/nikic updated
https://github.com/llvm/llvm-project/pull/122486
>From b32e3e1eee4b359ae2f0a1563420104de8d52277 Mon Sep 17 00:00:00 2001
From: Nikita Popov
Date: Fri, 10 Jan 2025 17:01:07 +0100
Subject: [PATCH] [Clang] Add -fwrapv-pointer flag
GCC supports three flags related
@@ -58,6 +58,26 @@ code bases.
containing strict-aliasing violations. The new default behavior can be
disabled using ``-fno-pointer-tbaa``.
+- Clang will now more aggressively use undefined behavior on pointer addition
+ overflow for optimization purposes. For example, a
@@ -58,6 +58,26 @@ code bases.
containing strict-aliasing violations. The new default behavior can be
disabled using ``-fno-pointer-tbaa``.
+- Clang will now more aggressively use undefined behavior on pointer addition
+ overflow for optimization purposes. For example, a
@@ -58,6 +58,26 @@ code bases.
containing strict-aliasing violations. The new default behavior can be
disabled using ``-fno-pointer-tbaa``.
+- Clang will now more aggressively use undefined behavior on pointer addition
nikic wrote:
I think it's hard to ad
https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/123283
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nikic wrote:
@frasercrmck BasicAA returns MayAlias for your example. Presumably AMDGPUAA
returns NoAlias because addrspace(3) and addrspace(0) can't alias, or something
like that.
https://github.com/llvm/llvm-project/pull/119365
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nikic wrote:
It's expected that there are regressions if you are mixing pointers with
different index widths. I'm open to ideas, but I don't see any obvious way we
can fully support pointers with different index widths while also being
correct. A key thing that BasicAA needs is the ability to
nikic wrote:
Looks like this change has some compile-time impact even if modules are not
used:
https://llvm-compile-time-tracker.com/compare.php?from=edc02351dd11cc4a39b7c541b26b71c6f36c8e55&to=7201cae106260aeb3e97d5291ff30f05076a&stat=instructions:u
It seems to add about 0.5% to C++ compi
https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/127023
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https://github.com/llvm/llvm-project/pull/127165
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@@ -0,0 +1,123 @@
+//===- FatLtoCleanup.cpp - clean up IR for the FatLTO pipeline --*- C++
-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Ap
https://github.com/nikic approved this pull request.
LGTM
https://github.com/llvm/llvm-project/pull/125911
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Author: Nikita Popov
Date: 2025-02-13T14:56:12+01:00
New Revision: 1e64ea9914d3cc839b52e50d2d497600e03c8b6e
URL:
https://github.com/llvm/llvm-project/commit/1e64ea9914d3cc839b52e50d2d497600e03c8b6e
DIFF:
https://github.com/llvm/llvm-project/commit/1e64ea9914d3cc839b52e50d2d497600e03c8b6e.diff
nikic wrote:
Thanks for the report! I've reverted the change for now.
```llvm
declare ptr @passthrough(ptr)
define i16 @test() {
%a = alloca i16, align 1
store i16 1, ptr %a, align 1
%call = call ptr @passthrough(ptr readnone captures(ret: address, provenance)
%a)
%v = load i16, ptr %
@@ -8,6 +8,7 @@
#include "ABIInfoImpl.h"
#include "TargetInfo.h"
+#include "llvm/IR/DerivedTypes.h"
nikic wrote:
I don't think the extra include is needed?
https://github.com/llvm/llvm-project/pull/126274
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LGTM
https://github.com/llvm/llvm-project/pull/124771
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@@ -19,6 +19,8 @@
#include "clang/AST/Type.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/IR/Constants.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/Support/Casting.h"
nikic wrote:
Shouldn't need the extra includes.
https://github.com/llvm/llv
https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/126378
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https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/126379
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https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/126380
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https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/126381
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https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/126400
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https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/127369
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https://github.com/nikic approved this pull request.
https://github.com/llvm/llvm-project/pull/127370
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nikic wrote:
> clang/lib/CodeGen/CGBuiltin.cpp is over 1MB long (>23k LoC), and can take
> minutes to recompile (depending on compiler and host system) when modified,
> and 5 seconds for clangd to update for every edit. Splitting this file was
> discussed in this thread:
It looks like while t
nikic wrote:
For example, the SPIR builtins file has barely more than 50 lines of code but
clocks in at 30M instructions (the *whole* of CGBuiltins.cpp was 120M
previously).
https://github.com/llvm/llvm-project/pull/132252
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@@ -215,6 +221,8 @@ class CGBuilderTy : public CGBuilderBaseTy {
///
/// This API assumes that drilling into a struct like this is always an
/// inbounds and nuw operation.
+ /// Specifically, inbounds flag will not be set if \p IsBaseConstantNull is
+ /// true.
---
@@ -1,24 +1,10 @@
-/*
- * Copyright (c) 2015 Advanced Micro Devices, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
deal
- * in the Software without restriction
@@ -548,11 +543,28 @@ SystemZTargetLowering::SystemZTargetLowering(const
TargetMachine &TM,
}
// Handle floating-point types.
+ if (!useSoftFloat()) {
+// Promote all f16 operations to float, with some exceptions below.
+for (unsigned Opc = 0; Opc < ISD::BUILTIN_
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