craig.topper updated this revision to Diff 123709.
craig.topper added a comment.
Still pass the attribute the backend if the value is 'none'.
We actually need this to know if the user specified the command line option at
all. The value of 'none' should disable limits and prevents needing to pick a
specific value.
https://reviews.llvm.org/D40230
Files:
docs/ClangCommandLineReference.rst
include/clang/Driver/Options.td
include/clang/Frontend/CodeGenOptions.h
lib/CodeGen/CGCall.cpp
lib/Driver/ToolChains/Clang.cpp
lib/Frontend/CompilerInvocation.cpp
test/CodeGen/attr-mprefer-vector-width.c
test/Driver/mprefer-vector-width.c
Index: test/Driver/mprefer-vector-width.c
===================================================================
--- /dev/null
+++ test/Driver/mprefer-vector-width.c
@@ -0,0 +1,24 @@
+////
+//// Verify that valid options for the -mprefer-vector-width flag are passed through and invalid options cause an error.
+////
+
+//// If there are no options, convert to 'all'.
+
+// RUN: %clang -### -S %s -mprefer-vector-width=none 2>&1 | FileCheck --check-prefix=WIDTHNONE %s
+// WIDTHNONE: "-mprefer-vector-width=none"
+
+//// Check options that cover all types.
+
+// RUN: %clang -### -S %s -mprefer-vector-width=128 2>&1 | FileCheck --check-prefix=WIDTH128 %s
+// WIDTH128: "-mprefer-vector-width=128"
+
+//// Check invalid parameters.
+
+// RUN: %clang -### -S %s -mprefer-vector-width=one 2>&1 | FileCheck --check-prefix=WIDTHONE %s
+// WIDTHONE: invalid value 'one' in 'mprefer-vector-width='
+
+// RUN: %clang -### -S %s -mprefer-vector-width=128.5 2>&1 | FileCheck --check-prefix=WIDTH128p5 %s
+// WIDTH128p5: invalue value '128.5' in 'mprefer-vector-width='
+
+// RUN: %clang -### -S %s -mprefer-vector-width=-128 2>&1 | FileCheck --check-prefix=WIDTHNEG128 %s
+// WIDTHNEG128: invalid value '-128' in 'mprefer-vector-width='
Index: test/CodeGen/attr-mprefer-vector-width.c
===================================================================
--- /dev/null
+++ test/CodeGen/attr-mprefer-vector-width.c
@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -mprefer-vector-width=128 -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECK128
+// RUN: %clang_cc1 -mprefer-vector-width=256 -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECK256
+// RUN: %clang_cc1 -mprefer-vector-width=none -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECKNONE
+
+int baz(int a) { return 4; }
+
+// CHECK128: baz{{.*}} #0
+// CHECK128: #0 = {{.*}}"prefer-vector-width"="128"
+
+// CHECK256: baz{{.*}} #0
+// CHECK256: #0 = {{.*}}"prefer-vector-width"="256"
+
+// CHECKNONE: baz{{.*}} #0
+// CHECKNONE-NOT: #0 = {{.*}}"prefer-vector-width"="none"
Index: lib/Frontend/CompilerInvocation.cpp
===================================================================
--- lib/Frontend/CompilerInvocation.cpp
+++ lib/Frontend/CompilerInvocation.cpp
@@ -713,6 +713,8 @@
Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
+ Opts.PreferVectorWidth = Args.getLastArgValue(OPT_mprefer_vector_width_EQ);
+
Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
Index: lib/Driver/ToolChains/Clang.cpp
===================================================================
--- lib/Driver/ToolChains/Clang.cpp
+++ lib/Driver/ToolChains/Clang.cpp
@@ -274,6 +274,27 @@
OutStrings.push_back(Args.MakeArgString(Out));
}
+/// The -mprefer-vector-width option accepts either a positive integer
+/// or the string "none".
+static void ParseMPreferVectorWidth(const Driver &D, const ArgList &Args,
+ ArgStringList &CmdArgs) {
+ Arg *A = Args.getLastArg(options::OPT_mprefer_vector_width_EQ);
+ if (!A)
+ return;
+
+ StringRef Value = A->getValue();
+ if (Value == "none") {
+ CmdArgs.push_back("-mprefer-vector-width=none");
+ } else {
+ unsigned Width;
+ if (Value.getAsInteger(10, Width)) {
+ D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Value;
+ return;
+ }
+ CmdArgs.push_back(Args.MakeArgString("-mprefer-vector-width=" + Value));
+ }
+}
+
static void getWebAssemblyTargetFeatures(const ArgList &Args,
std::vector<StringRef> &Features) {
handleTargetFeaturesGroup(Args, Features, options::OPT_m_wasm_Features_Group);
@@ -4306,6 +4327,8 @@
options::OPT_fno_slp_vectorize, EnableSLPVec))
CmdArgs.push_back("-vectorize-slp");
+ ParseMPreferVectorWidth(D, Args, CmdArgs);
+
if (Arg *A = Args.getLastArg(options::OPT_fshow_overloads_EQ))
A->render(Args, CmdArgs);
Index: lib/CodeGen/CGCall.cpp
===================================================================
--- lib/CodeGen/CGCall.cpp
+++ lib/CodeGen/CGCall.cpp
@@ -1744,6 +1744,10 @@
FuncAttrs.addAttribute("reciprocal-estimates",
llvm::join(Recips, ","));
+ if (!CodeGenOpts.PreferVectorWidth.empty())
+ FuncAttrs.addAttribute("prefer-vector-width",
+ CodeGenOpts.PreferVectorWidth);
+
if (CodeGenOpts.StackRealignment)
FuncAttrs.addAttribute("stackrealign");
if (CodeGenOpts.Backchain)
Index: include/clang/Frontend/CodeGenOptions.h
===================================================================
--- include/clang/Frontend/CodeGenOptions.h
+++ include/clang/Frontend/CodeGenOptions.h
@@ -253,6 +253,11 @@
std::vector<std::string> Reciprocals;
+ /// The preferred width for auto-vectorization transforms. This is intended to
+ /// override default transforms based on the width of the architected vector
+ /// registers.
+ std::string PreferVectorWidth;
+
public:
// Define accessors/mutators for code generation options of enumeration type.
#define CODEGENOPT(Name, Bits, Default)
Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td
+++ include/clang/Driver/Options.td
@@ -1940,6 +1940,8 @@
def mimplicit_float : Flag<["-"], "mimplicit-float">, Group<m_Group>;
def mrecip : Flag<["-"], "mrecip">, Group<m_Group>;
def mrecip_EQ : CommaJoined<["-"], "mrecip=">, Group<m_Group>, Flags<[CC1Option]>;
+def mprefer_vector_width_EQ : Joined<["-"], "mprefer-vector-width=">, Group<m_Group>, Flags<[CC1Option]>,
+ HelpText<"Specifies preferred vector width for auto-vectorization. A value of 'none' resets to default">;
def mpie_copy_relocations : Flag<["-"], "mpie-copy-relocations">, Group<m_Group>,
Flags<[CC1Option]>,
HelpText<"Use copy relocations support for PIE builds">;
Index: docs/ClangCommandLineReference.rst
===================================================================
--- docs/ClangCommandLineReference.rst
+++ docs/ClangCommandLineReference.rst
@@ -2104,6 +2104,10 @@
Use copy relocations support for PIE builds
+.. option:: -mprefer-vector-width=<arg>
+
+Specifies preferred vector width for auto-vectorization. A value of 'none' resets to default
+
.. option:: -mqdsp6-compat
Enable hexagon-qdsp6 backward compatibility
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