https://github.com/mrkajetanp created
https://github.com/llvm/llvm-project/pull/132801
Add -f[no-]slp-vectorize to the flang driver.
Add corresponding -fvectorize-slp to the flang frontend.
>From d9b2a86d01688b69b8f116f6b52caeec8cd6e756 Mon Sep 17 00:00:00 2001
From: Kajetan Puchalski <kajetan.puchal...@arm.com>
Date: Mon, 24 Mar 2025 17:28:03 +0000
Subject: [PATCH] [flang] Add -f[no-]slp-vectorize flags
Add -f[no-]slp-vectorize to the flang driver.
Add corresponding -fvectorize-slp to the flang frontend.
Signed-off-by: Kajetan Puchalski <kajetan.puchal...@arm.com>
---
clang/include/clang/Driver/Options.td | 9 ++++++---
clang/lib/Driver/ToolChains/Flang.cpp | 8 ++++++++
flang/include/flang/Frontend/CodeGenOptions.def | 1 +
flang/lib/Frontend/CompilerInvocation.cpp | 3 +++
flang/lib/Frontend/FrontendActions.cpp | 1 +
flang/test/Driver/slp-vectorize.f90 | 10 ++++++++++
6 files changed, 29 insertions(+), 3 deletions(-)
create mode 100644 flang/test/Driver/slp-vectorize.f90
diff --git a/clang/include/clang/Driver/Options.td
b/clang/include/clang/Driver/Options.td
index 59a57c83c6b89..a2cdf9f26fcdf 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4032,11 +4032,14 @@ def : Flag<["-"], "ftree-vectorize">, Alias<fvectorize>;
def : Flag<["-"], "fno-tree-vectorize">, Alias<fno_vectorize>;
}
+let Visibility = [ClangOption, FlangOption] in {
def fslp_vectorize : Flag<["-"], "fslp-vectorize">, Group<f_Group>,
HelpText<"Enable the superword-level parallelism vectorization passes">;
def fno_slp_vectorize : Flag<["-"], "fno-slp-vectorize">, Group<f_Group>;
def : Flag<["-"], "ftree-slp-vectorize">, Alias<fslp_vectorize>;
def : Flag<["-"], "fno-tree-slp-vectorize">, Alias<fno_slp_vectorize>;
+}
+
def Wlarge_by_value_copy_def : Flag<["-"], "Wlarge-by-value-copy">,
HelpText<"Warn if a function definition returns or accepts an object larger "
"in bytes than a given value">, Flags<[HelpHidden]>;
@@ -7384,6 +7387,9 @@ def mlink_bitcode_file
def vectorize_loops : Flag<["-"], "vectorize-loops">,
HelpText<"Run the Loop vectorization passes">,
MarshallingInfoFlag<CodeGenOpts<"VectorizeLoop">>;
+def vectorize_slp : Flag<["-"], "vectorize-slp">,
+ HelpText<"Run the SLP vectorization passes">,
+ MarshallingInfoFlag<CodeGenOpts<"VectorizeSLP">>;
} // let Visibility = [CC1Option, FC1Option]
let Visibility = [CC1Option] in {
@@ -7499,9 +7505,6 @@ defm link_builtin_bitcode_postopt:
BoolMOption<"link-builtin-bitcode-postopt",
PosFlag<SetTrue, [], [ClangOption], "Link builtin bitcodes after the "
"optimization pipeline">,
NegFlag<SetFalse, [], [ClangOption]>>;
-def vectorize_slp : Flag<["-"], "vectorize-slp">,
- HelpText<"Run the SLP vectorization passes">,
- MarshallingInfoFlag<CodeGenOpts<"VectorizeSLP">>;
def linker_option : Joined<["--"], "linker-option=">,
HelpText<"Add linker option">,
MarshallingInfoStringVector<CodeGenOpts<"LinkerOptions">>;
diff --git a/clang/lib/Driver/ToolChains/Flang.cpp
b/clang/lib/Driver/ToolChains/Flang.cpp
index 5dbc5cbe77d0a..bb89432d3e58c 100644
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -161,6 +161,14 @@ void Flang::addCodegenOptions(const ArgList &Args,
options::OPT_fno_vectorize, enableVec))
CmdArgs.push_back("-vectorize-loops");
+ // -fslp-vectorize is enabled based on the optimization level selected.
+ bool EnableSLPVec = shouldEnableVectorizerAtOLevel(Args, true);
+ OptSpecifier SLPVectAliasOption =
+ EnableSLPVec ? options::OPT_O_Group : options::OPT_fslp_vectorize;
+ if (Args.hasFlag(options::OPT_fslp_vectorize, SLPVectAliasOption,
+ options::OPT_fno_slp_vectorize, EnableSLPVec))
+ CmdArgs.push_back("-vectorize-slp");
+
if (shouldLoopVersion(Args))
CmdArgs.push_back("-fversion-loops-for-stride");
diff --git a/flang/include/flang/Frontend/CodeGenOptions.def
b/flang/include/flang/Frontend/CodeGenOptions.def
index 44cb5a2cdd497..5d6af4271d4f6 100644
--- a/flang/include/flang/Frontend/CodeGenOptions.def
+++ b/flang/include/flang/Frontend/CodeGenOptions.def
@@ -32,6 +32,7 @@ CODEGENOPT(PrepareForThinLTO , 1, 0) ///< Set when -flto=thin
is enabled on the
///< compile step.
CODEGENOPT(StackArrays, 1, 0) ///< -fstack-arrays (enable the stack-arrays
pass)
CODEGENOPT(VectorizeLoop, 1, 0) ///< Enable loop vectorization.
+CODEGENOPT(VectorizeSLP, 1, 0) ///< Enable SLP vectorization.
CODEGENOPT(LoopVersioning, 1, 0) ///< Enable loop versioning.
CODEGENOPT(UnrollLoops, 1, 0) ///< Enable loop unrolling
CODEGENOPT(AliasAnalysis, 1, 0) ///< Enable alias analysis pass
diff --git a/flang/lib/Frontend/CompilerInvocation.cpp
b/flang/lib/Frontend/CompilerInvocation.cpp
index f433ec9966922..652b3d8795ab7 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -246,6 +246,9 @@ static void
parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
if (args.getLastArg(clang::driver::options::OPT_vectorize_loops))
opts.VectorizeLoop = 1;
+ if (args.getLastArg(clang::driver::options::OPT_vectorize_slp))
+ opts.VectorizeSLP = 1;
+
if (args.hasFlag(clang::driver::options::OPT_floop_versioning,
clang::driver::options::OPT_fno_loop_versioning, false))
opts.LoopVersioning = 1;
diff --git a/flang/lib/Frontend/FrontendActions.cpp
b/flang/lib/Frontend/FrontendActions.cpp
index 46ec7550e4140..3e6e98855fe7a 100644
--- a/flang/lib/Frontend/FrontendActions.cpp
+++ b/flang/lib/Frontend/FrontendActions.cpp
@@ -933,6 +933,7 @@ void
CodeGenAction::runOptimizationPipeline(llvm::raw_pwrite_stream &os) {
pto.LoopUnrolling = opts.UnrollLoops;
pto.LoopInterleaving = opts.UnrollLoops;
pto.LoopVectorization = opts.VectorizeLoop;
+ pto.SLPVectorization = opts.VectorizeSLP;
llvm::PassBuilder pb(targetMachine, pto, pgoOpt, &pic);
diff --git a/flang/test/Driver/slp-vectorize.f90
b/flang/test/Driver/slp-vectorize.f90
new file mode 100644
index 0000000000000..55d4be1a13c71
--- /dev/null
+++ b/flang/test/Driver/slp-vectorize.f90
@@ -0,0 +1,10 @@
+! RUN: %flang -### -S -fslp-vectorize %s 2>&1 | FileCheck
-check-prefix=CHECK-SLP-VECTORIZE %s
+! RUN: %flang -### -S -fno-slp-vectorize %s 2>&1 | FileCheck
-check-prefix=CHECK-NO-SLP-VECTORIZE %s
+! RUN: %flang -### -S -O1 %s 2>&1 | FileCheck
-check-prefix=CHECK-NO-SLP-VECTORIZE %s
+! RUN: %flang -### -S -O2 %s 2>&1 | FileCheck
-check-prefix=CHECK-SLP-VECTORIZE %s
+! RUN: %flang -### -S -O3 %s 2>&1 | FileCheck
-check-prefix=CHECK-SLP-VECTORIZE %s
+! CHECK-SLP-VECTORIZE: "-vectorize-slp"
+! CHECK-NO-SLP-VECTORIZE-NOT: "-no-vectorize-slp"
+
+program test
+end program
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