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Differential D67311

[X86] Add prefer-128-bit subtarget feature.
ClosedPublic

Authored by craig.topper on Sep 6 2019, 9:35 PM.

Details

Reviewers
RKSimon
echristo
spatel
atdt
Commits
rG8cfff1e1bc2e: [X86] Add prefer-128-bit subtarget feature.
rL371319: [X86] Add prefer-128-bit subtarget feature.
Summary

Similar to the previous prefer-256-bit flag. We might want to
enable this by default some CPUs. This just starts the initial
work to implement and prove that it effects TTI's vector width.

Diff Detail

Event Timeline

craig.topper created this revision.Sep 6 2019, 9:35 PM
Herald added a project: Restricted Project. · View Herald TranscriptSep 6 2019, 9:35 PM
Herald added a subscriber: hiraditya. · View Herald Transcript
Harbormaster completed remote builds in B37889: Diff 219221.Sep 6 2019, 9:37 PM
lebedev.ri added a subscriber: lebedev.ri.Sep 7 2019, 12:20 AM
lebedev.ri added inline comments.
llvm/lib/Target/X86/X86.td
383

Did you mean SSE?

craig.topper marked an inline comment as done.Sep 7 2019, 12:30 AM
craig.topper added inline comments.
llvm/lib/Target/X86/X86.td
383

We'll end up using 128-bit VEX encoded instructions which are part of AVX/AVX2

RKSimon accepted this revision.Sep 7 2019, 4:45 AM

LGTM - this could be useful!

This revision is now accepted and ready to land.Sep 7 2019, 4:45 AM
Closed by commit rL371319: [X86] Add prefer-128-bit subtarget feature. (authored by ctopper). · Explain WhySep 7 2019, 12:53 PM
This revision was automatically updated to reflect the committed changes.

Revision Contents

PathSize
llvm/
lib/
Target/
X86/
4 lines
3 lines
2 lines
1 line
test/
Transforms/
SLPVectorizer/
X86/
6 lines
8 lines
6 lines
6 lines

Diff 219221

llvm/lib/Target/X86/X86.td

Show First 20 Lines • Show All 372 Lines • ▼ Show 20 Lines
// Gather is available since Haswell (AVX2 set). So technically, we can // Gather is available since Haswell (AVX2 set). So technically, we can
// generate Gathers on all AVX2 processors. But the overhead on HSW is high. // generate Gathers on all AVX2 processors. But the overhead on HSW is high.
// Skylake Client processor has faster Gathers than HSW and performance is // Skylake Client processor has faster Gathers than HSW and performance is
// similar to Skylake Server (AVX-512). // similar to Skylake Server (AVX-512).
def FeatureHasFastGather def FeatureHasFastGather
: SubtargetFeature<"fast-gather", "HasFastGather", "true", : SubtargetFeature<"fast-gather", "HasFastGather", "true",
"Indicates if gather is reasonably fast">; "Indicates if gather is reasonably fast">;
def FeaturePrefer128Bit
: SubtargetFeature<"prefer-128-bit", "Prefer128Bit", "true",
"Prefer 128-bit AVX instructions">;
lebedev.riUnsubmitted
Not Done
ReplyInline Actions

Did you mean SSE?

lebedev.ri: Did you mean SSE?
craig.topperAuthorUnsubmitted
Done
ReplyInline Actions

We'll end up using 128-bit VEX encoded instructions which are part of AVX/AVX2

craig.topper: We'll end up using 128-bit VEX encoded instructions which are part of AVX/AVX2
def FeaturePrefer256Bit def FeaturePrefer256Bit
: SubtargetFeature<"prefer-256-bit", "Prefer256Bit", "true", : SubtargetFeature<"prefer-256-bit", "Prefer256Bit", "true",
"Prefer 256-bit AVX instructions">; "Prefer 256-bit AVX instructions">;
// Lower indirect calls using a special construct called a `retpoline` to // Lower indirect calls using a special construct called a `retpoline` to
// mitigate potential Spectre v2 attacks against them. // mitigate potential Spectre v2 attacks against them.
def FeatureRetpolineIndirectCalls def FeatureRetpolineIndirectCalls
: SubtargetFeature< : SubtargetFeature<
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llvm/lib/Target/X86/X86Subtarget.h

Show First 20 Lines • Show All 430 Lines • ▼ Show 20 Linesprotected:
/// entry to the function and which must be maintained by every function. /// entry to the function and which must be maintained by every function.
unsigned stackAlignment = 4; unsigned stackAlignment = 4;
/// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops. /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
/// ///
// FIXME: this is a known good value for Yonah. How about others? // FIXME: this is a known good value for Yonah. How about others?
unsigned MaxInlineSizeThreshold = 128; unsigned MaxInlineSizeThreshold = 128;
/// Indicates target prefers 128 bit instructions.
bool Prefer128Bit = false;
/// Indicates target prefers 256 bit instructions. /// Indicates target prefers 256 bit instructions.
bool Prefer256Bit = false; bool Prefer256Bit = false;
/// Threeway branch is profitable in this subtarget. /// Threeway branch is profitable in this subtarget.
bool ThreewayBranchProfitable = false; bool ThreewayBranchProfitable = false;
/// What processor and OS we're targeting. /// What processor and OS we're targeting.
Triple TargetTriple; Triple TargetTriple;
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llvm/lib/Target/X86/X86Subtarget.cpp

Show First 20 Lines • Show All 301 Lines • ▼ Show 20 Linesvoid X86Subtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
if (hasAVX512() || (hasAVX2() && hasFastGather())) if (hasAVX512() || (hasAVX2() && hasFastGather()))
GatherOverhead = 2; GatherOverhead = 2;
if (hasAVX512()) if (hasAVX512())
ScatterOverhead = 2; ScatterOverhead = 2;
// Consume the vector width attribute or apply any target specific limit. // Consume the vector width attribute or apply any target specific limit.
if (PreferVectorWidthOverride) if (PreferVectorWidthOverride)
PreferVectorWidth = PreferVectorWidthOverride; PreferVectorWidth = PreferVectorWidthOverride;
else if (Prefer128Bit)
PreferVectorWidth = 128;
else if (Prefer256Bit) else if (Prefer256Bit)
PreferVectorWidth = 256; PreferVectorWidth = 256;
} }
X86Subtarget &X86Subtarget::initializeSubtargetDependencies(StringRef CPU, X86Subtarget &X86Subtarget::initializeSubtargetDependencies(StringRef CPU,
StringRef FS) { StringRef FS) {
initSubtargetFeatures(CPU, FS); initSubtargetFeatures(CPU, FS);
return *this; return *this;
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llvm/lib/Target/X86/X86TargetTransformInfo.h

Show First 20 Lines • Show All 77 Lines • ▼ Show 20 Lines const FeatureBitset InlineFeatureIgnoreList = {
X86::FeatureSlowTwoMemOps, X86::FeatureSlowTwoMemOps,
X86::FeatureSlowUAMem16, X86::FeatureSlowUAMem16,
// Perf-tuning flags. // Perf-tuning flags.
X86::FeatureHasFastGather, X86::FeatureHasFastGather,
X86::FeatureSlowUAMem32, X86::FeatureSlowUAMem32,
// Based on whether user set the -mprefer-vector-width command line. // Based on whether user set the -mprefer-vector-width command line.
X86::FeaturePrefer128Bit,
X86::FeaturePrefer256Bit, X86::FeaturePrefer256Bit,
// CPU name enums. These just follow CPU string. // CPU name enums. These just follow CPU string.
X86::ProcIntelAtom, X86::ProcIntelAtom,
X86::ProcIntelGLM, X86::ProcIntelGLM,
X86::ProcIntelGLP, X86::ProcIntelGLP,
X86::ProcIntelSLM, X86::ProcIntelSLM,
X86::ProcIntelTRM, X86::ProcIntelTRM,
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llvm/test/Transforms/SLPVectorizer/X86/arith-add.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -mtriple=x86_64-unknown -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE ; RUN: opt < %s -mtriple=x86_64-unknown -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=slm -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SLM ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=slm -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SLM
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX1 ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -mattr=-prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX1
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2 ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -mattr=+prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -mattr=-prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -mattr=+prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=knl -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512F ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=knl -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512F
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=-prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512BW ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=-prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512BW
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=+prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2 ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=+prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2
@a64 = common global [8 x i64] zeroinitializer, align 64 @a64 = common global [8 x i64] zeroinitializer, align 64
@b64 = common global [8 x i64] zeroinitializer, align 64 @b64 = common global [8 x i64] zeroinitializer, align 64
@c64 = common global [8 x i64] zeroinitializer, align 64 @c64 = common global [8 x i64] zeroinitializer, align 64
@a32 = common global [16 x i32] zeroinitializer, align 64 @a32 = common global [16 x i32] zeroinitializer, align 64
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llvm/test/Transforms/SLPVectorizer/X86/arith-fp.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -mtriple=x86_64-unknown -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE ; RUN: opt < %s -mtriple=x86_64-unknown -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=slm -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SLM ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=slm -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SLM
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -mattr=-prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX1
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -mattr=+prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -mattr=-prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -mattr=+prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512BW
; ;
; 128-bit Vectors ; 128-bit Vectors
; ;
define <2 x double> @buildvector_add_2f64(<2 x double> %a, <2 x double> %b) { define <2 x double> @buildvector_add_2f64(<2 x double> %a, <2 x double> %b) {
; CHECK-LABEL: @buildvector_add_2f64( ; CHECK-LABEL: @buildvector_add_2f64(
; CHECK-NEXT: [[TMP1:%.*]] = fadd <2 x double> [[A:%.*]], [[B:%.*]] ; CHECK-NEXT: [[TMP1:%.*]] = fadd <2 x double> [[A:%.*]], [[B:%.*]]
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llvm/test/Transforms/SLPVectorizer/X86/arith-mul.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -mtriple=x86_64-unknown -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE ; RUN: opt < %s -mtriple=x86_64-unknown -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=slm -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SLM ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=slm -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SLM
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX1 ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -mattr=-prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX1
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2 ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -mattr=+prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -mattr=-prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -mattr=+prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=knl -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512F ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=knl -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512F
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=-prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512BW ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=-prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512BW
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=+prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2 ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=+prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2
@a64 = common global [8 x i64] zeroinitializer, align 64 @a64 = common global [8 x i64] zeroinitializer, align 64
@b64 = common global [8 x i64] zeroinitializer, align 64 @b64 = common global [8 x i64] zeroinitializer, align 64
@c64 = common global [8 x i64] zeroinitializer, align 64 @c64 = common global [8 x i64] zeroinitializer, align 64
@a32 = common global [16 x i32] zeroinitializer, align 64 @a32 = common global [16 x i32] zeroinitializer, align 64
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llvm/test/Transforms/SLPVectorizer/X86/arith-sub.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -mtriple=x86_64-unknown -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE ; RUN: opt < %s -mtriple=x86_64-unknown -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=slm -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SLM ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=slm -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SLM
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX1 ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -mattr=-prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX1
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2 ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=corei7-avx -mattr=+prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -mattr=-prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=core-avx2 -mattr=+prefer-128-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=SSE
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=knl -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512F ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=knl -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512F
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=-prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512BW ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=-prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX512 --check-prefix=AVX512BW
; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=+prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2 ; RUN: opt < %s -mtriple=x86_64-unknown -mcpu=skx -mattr=+prefer-256-bit -basicaa -slp-vectorizer -S | FileCheck %s --check-prefix=CHECK --check-prefix=AVX --check-prefix=AVX2
@a64 = common global [8 x i64] zeroinitializer, align 64 @a64 = common global [8 x i64] zeroinitializer, align 64
@b64 = common global [8 x i64] zeroinitializer, align 64 @b64 = common global [8 x i64] zeroinitializer, align 64
@c64 = common global [8 x i64] zeroinitializer, align 64 @c64 = common global [8 x i64] zeroinitializer, align 64
@a32 = common global [16 x i32] zeroinitializer, align 64 @a32 = common global [16 x i32] zeroinitializer, align 64
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