Add GCC-compatible flags -fprofile-generate and -fprofile-use
Diego Novillo
dnovillo at google.com
Thu Jul 9 09:35:03 PDT 2015
On Wed, Jul 8, 2015 at 6:10 PM, Justin Bogner <mail at justinbogner.com> wrote:
>> +def fprofile_use_EQ : Joined<["-"], "fprofile-use=">,
>> + Group<f_Group>, Flags<[DriverOption]>, MetaVarName<"<pathname>">,
>> + HelpText<"Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profile. Otherwise, it reads from file <pathname>.">;
>
> This should say "default.profdata" here to match the code.
Done.
> I think we want a single call to getLastArg here, with all four
> variants. As is, it isn't last wins - it uses -fprofile-instr-generate=,
> and if there isn't one of those then it uses -fprofile-generate=, etc.
I'm a goof. I was convinced I had done this before sending the patch.
Now really done using Richard's suggestion.
> Also, how is -fprofile-generate handled right now? It seems to be
> missing.
It's declared as an alias to -fprofile-instr-generate, so we don't
even see it in here. Likewise for -fprofile-use.
OK to commit?
Thanks. Diego.
-------------- next part --------------
diff --git a/docs/UsersManual.rst b/docs/UsersManual.rst
index cd1b2b3..20ee569 100644
--- a/docs/UsersManual.rst
+++ b/docs/UsersManual.rst
@@ -1488,6 +1488,45 @@ instrumentation:
profile. As you make changes to your code, clang may no longer be able to
use the profile data. It will warn you when this happens.
+Profile generation and use can also be controlled by the GCC-compatible flags
+``-fprofile-generate`` and ``-fprofile-use``. Although these flags are
+semantically equivalent to their GCC counterparts, they *do not* handle
+GCC-compatible profiles. They are only meant to implement GCC's semantics
+with respect to profile creation and use.
+
+.. option:: -fprofile-generate[=<dirname>]
+
+ Without any other arguments, ``-fprofile-generate`` behaves identically to
+ ``-fprofile-instr-generate``. When given a directory name, it generates the
+ profile file ``default.profraw`` in the directory named ``dirname``. If
+ ``dirname`` does not exist, it will be created at runtime. The environment
+ variable ``LLVM_PROFILE_FILE`` can be used to override the directory and
+ filename for the profile file at runtime. For example,
+
+ .. code-block:: console
+
+ $ clang++ -O2 -fprofile-generate=yyy/zzz code.cc -o code
+
+ When ``code`` is executed, the profile will be written to the file
+ ``yyy/zzz/default.profraw``. This can be altered at runtime via the
+ ``LLVM_PROFILE_FILE`` environment variable:
+
+ .. code-block:: console
+
+ $ LLVM_PROFILE_FILE=/tmp/myprofile/code.profraw ./code
+
+ The above invocation will produce the profile file
+ ``/tmp/myprofile/code.profraw`` instead of ``yyy/zzz/default.profraw``.
+ Notice that ``LLVM_PROFILE_FILE`` overrides the directory *and* the file
+ name for the profile file.
+
+.. option:: -fprofile-use[=<pathname>]
+
+ Without any other arguments, ``-fprofile-use`` behaves identically to
+ ``-fprofile-instr-use``. Otherwise, if ``pathname`` is the full path to a
+ profile file, it reads from that file. If ``pathname`` is a directory name,
+ it reads from ``pathname/default.profdata``.
+
Controlling Size of Debug Information
-------------------------------------
diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index df90371..d4461e1 100644
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -422,13 +422,24 @@ def fprofile_instr_generate : Flag<["-"], "fprofile-instr-generate">,
def fprofile_instr_generate_EQ : Joined<["-"], "fprofile-instr-generate=">,
Group<f_Group>, Flags<[CC1Option]>, MetaVarName<"<file>">,
HelpText<"Generate instrumented code to collect execution counts into <file> (overridden by LLVM_PROFILE_FILE env var)">;
-def fprofile_instr_use : Flag<["-"], "fprofile-instr-use">, Group<f_Group>;
+def fprofile_instr_use : Flag<["-"], "fprofile-instr-use">, Group<f_Group>,
+ Flags<[DriverOption]>;
def fprofile_instr_use_EQ : Joined<["-"], "fprofile-instr-use=">,
Group<f_Group>, Flags<[CC1Option]>,
HelpText<"Use instrumentation data for profile-guided optimization">;
def fcoverage_mapping : Flag<["-"], "fcoverage-mapping">,
Group<f_Group>, Flags<[CC1Option]>,
HelpText<"Generate coverage mapping to enable code coverage analysis">;
+def fprofile_generate : Flag<["-"], "fprofile-generate">,
+ Alias<fprofile_instr_generate>;
+def fprofile_generate_EQ : Joined<["-"], "fprofile-generate=">,
+ Group<f_Group>, Flags<[DriverOption]>, MetaVarName<"<directory>">,
+ HelpText<"Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)">;
+def fprofile_use : Flag<["-"], "fprofile-use">, Group<f_Group>,
+ Alias<fprofile_instr_use>;
+def fprofile_use_EQ : Joined<["-"], "fprofile-use=">,
+ Group<f_Group>, Flags<[DriverOption]>, MetaVarName<"<pathname>">,
+ HelpText<"Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>.">;
def fblocks : Flag<["-"], "fblocks">, Group<f_Group>, Flags<[CC1Option]>,
HelpText<"Enable the 'blocks' language feature">;
@@ -904,7 +915,6 @@ def fpie : Flag<["-"], "fpie">, Group<f_Group>;
def fno_pie : Flag<["-"], "fno-pie">, Group<f_Group>;
def fprofile_arcs : Flag<["-"], "fprofile-arcs">, Group<f_Group>;
def fno_profile_arcs : Flag<["-"], "fno-profile-arcs">, Group<f_Group>;
-def fprofile_generate : Flag<["-"], "fprofile-generate">, Group<f_Group>;
def framework : Separate<["-"], "framework">, Flags<[LinkerInput]>;
def frandom_seed_EQ : Joined<["-"], "frandom-seed=">, Group<clang_ignored_f_Group>;
def freg_struct_return : Flag<["-"], "freg-struct-return">, Group<f_Group>, Flags<[CC1Option]>,
@@ -1794,8 +1804,6 @@ defm : BooleanFFlag<"keep-inline-functions">, Group<clang_ignored_gcc_optimizati
def fprofile_dir : Joined<["-"], "fprofile-dir=">, Group<clang_ignored_gcc_optimization_f_Group>;
-defm profile_use : BooleanFFlag<"profile-use">, Group<clang_ignored_gcc_optimization_f_Group>;
-def fprofile_use_EQ : Joined<["-"], "fprofile-use=">, Group<clang_ignored_gcc_optimization_f_Group>;
def fuse_ld_EQ : Joined<["-"], "fuse-ld=">, Group<f_Group>;
defm align_functions : BooleanFFlag<"align-functions">, Group<clang_ignored_gcc_optimization_f_Group>;
diff --git a/include/clang/Frontend/CodeGenOptions.h b/include/clang/Frontend/CodeGenOptions.h
index 66597bd..53246bc 100644
--- a/include/clang/Frontend/CodeGenOptions.h
+++ b/include/clang/Frontend/CodeGenOptions.h
@@ -155,6 +155,7 @@ public:
std::vector<std::string> DependentLibraries;
/// Name of the profile file to use as output for -fprofile-instr-generate
+ /// and -fprofile-generate.
std::string InstrProfileOutput;
/// Name of the profile file to use with -fprofile-sample-use.
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 463503b..fd70868 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -303,6 +303,7 @@ void Darwin::addProfileRTLibs(const ArgList &Args,
if (!(Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
false) ||
Args.hasArg(options::OPT_fprofile_generate) ||
+ Args.hasArg(options::OPT_fprofile_generate_EQ) ||
Args.hasArg(options::OPT_fprofile_instr_generate) ||
Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
Args.hasArg(options::OPT_fcreate_profile) ||
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 1795ccf..6a1ac11 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -2298,6 +2298,7 @@ static void addProfileRT(const ToolChain &TC, const ArgList &Args,
if (!(Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
false) ||
Args.hasArg(options::OPT_fprofile_generate) ||
+ Args.hasArg(options::OPT_fprofile_generate_EQ) ||
Args.hasArg(options::OPT_fprofile_instr_generate) ||
Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
Args.hasArg(options::OPT_fcreate_profile) ||
@@ -3532,23 +3533,47 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
Args.AddAllArgs(CmdArgs, options::OPT_finstrument_functions);
- if ((Args.hasArg(options::OPT_fprofile_instr_generate) ||
- Args.hasArg(options::OPT_fprofile_instr_generate_EQ)) &&
- (Args.hasArg(options::OPT_fprofile_instr_use) ||
- Args.hasArg(options::OPT_fprofile_instr_use_EQ)))
- D.Diag(diag::err_drv_argument_not_allowed_with)
- << "-fprofile-instr-generate"
- << "-fprofile-instr-use";
+ auto *ProfileGenerateArg = Args.getLastArg(
+ options::OPT_fprofile_instr_generate,
+ options::OPT_fprofile_instr_generate_EQ, options::OPT_fprofile_generate,
+ options::OPT_fprofile_generate_EQ);
- if (Arg *A = Args.getLastArg(options::OPT_fprofile_instr_generate_EQ))
- A->render(Args, CmdArgs);
- else
+ auto *ProfileUseArg = Args.getLastArg(
+ options::OPT_fprofile_instr_use, options::OPT_fprofile_instr_use_EQ,
+ options::OPT_fprofile_use, options::OPT_fprofile_use_EQ);
+
+ if (ProfileGenerateArg && ProfileUseArg)
+ D.Diag(diag::err_drv_argument_not_allowed_with)
+ << ProfileGenerateArg->getSpelling()
+ << ProfileUseArg->getSpelling();
+
+ if (ProfileGenerateArg &&
+ ProfileGenerateArg->getOption().matches(
+ options::OPT_fprofile_instr_generate_EQ))
+ ProfileGenerateArg->render(Args, CmdArgs);
+ else if (ProfileGenerateArg &&
+ ProfileGenerateArg->getOption().matches(
+ options::OPT_fprofile_generate_EQ)) {
+ SmallString<128> Path(ProfileGenerateArg->getValue());
+ llvm::sys::path::append(Path, "default.profraw");
+ CmdArgs.push_back(
+ Args.MakeArgString(Twine("-fprofile-instr-generate=") + Path));
+ } else
Args.AddAllArgs(CmdArgs, options::OPT_fprofile_instr_generate);
- if (Arg *A = Args.getLastArg(options::OPT_fprofile_instr_use_EQ))
- A->render(Args, CmdArgs);
- else if (Args.hasArg(options::OPT_fprofile_instr_use))
- CmdArgs.push_back("-fprofile-instr-use=pgo-data");
+ if (ProfileUseArg &&
+ ProfileUseArg->getOption().matches(options::OPT_fprofile_instr_use_EQ))
+ ProfileUseArg->render(Args, CmdArgs);
+ else if (ProfileUseArg &&
+ (ProfileUseArg->getOption().matches(options::OPT_fprofile_use_EQ) ||
+ ProfileUseArg->getOption().matches(
+ options::OPT_fprofile_instr_use))) {
+ SmallString<128> Path(
+ ProfileUseArg->getNumValues() == 0 ? "" : ProfileUseArg->getValue());
+ if (Path.empty() || llvm::sys::fs::is_directory(Path))
+ llvm::sys::path::append(Path, "default.profdata");
+ CmdArgs.push_back(Args.MakeArgString(Twine("-fprofile-instr-use=") + Path));
+ }
if (Args.hasArg(options::OPT_ftest_coverage) ||
Args.hasArg(options::OPT_coverage))
@@ -3558,9 +3583,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
Args.hasArg(options::OPT_coverage))
CmdArgs.push_back("-femit-coverage-data");
- if (Args.hasArg(options::OPT_fcoverage_mapping) &&
- !(Args.hasArg(options::OPT_fprofile_instr_generate) ||
- Args.hasArg(options::OPT_fprofile_instr_generate_EQ)))
+ if (Args.hasArg(options::OPT_fcoverage_mapping) && !ProfileGenerateArg)
D.Diag(diag::err_drv_argument_only_allowed_with)
<< "-fcoverage-mapping"
<< "-fprofile-instr-generate";
diff --git a/test/Driver/clang_f_opts.c b/test/Driver/clang_f_opts.c
index 68890a7..6a72033 100644
--- a/test/Driver/clang_f_opts.c
+++ b/test/Driver/clang_f_opts.c
@@ -66,6 +66,40 @@
// CHECK-PROFILE-ARCS: "-femit-coverage-data"
// CHECK-NO-PROFILE-ARCS-NOT: "-femit-coverage-data"
+// RUN: %clang -### -S -fprofile-generate %s 2>&1 | FileCheck -check-prefix=CHECK-PROFILE-GENERATE %s
+// RUN: %clang -### -S -fprofile-instr-generate %s 2>&1 | FileCheck -check-prefix=CHECK-PROFILE-GENERATE %s
+// RUN: %clang -### -S -fprofile-generate=/some/dir %s 2>&1 | FileCheck -check-prefix=CHECK-PROFILE-GENERATE-DIR %s
+// RUN: %clang -### -S -fprofile-instr-generate=/tmp/somefile.profraw %s 2>&1 | FileCheck -check-prefix=CHECK-PROFILE-GENERATE-FILE %s
+// RUN: %clang -### -S -fprofile-generate -fprofile-use %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-generate -fprofile-use=dir %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-generate -fprofile-instr-use %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-generate -fprofile-instr-use=file %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-instr-generate -fprofile-use %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-instr-generate -fprofile-use=dir %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-instr-generate -fprofile-instr-use %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-instr-generate -fprofile-instr-use=file %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-instr-generate=file -fprofile-use %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-instr-generate=file -fprofile-use=dir %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-instr-generate=file -fprofile-instr-use %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-instr-generate=file -fprofile-instr-use=file %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-generate=dir -fprofile-use %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-generate=dir -fprofile-use=dir %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-generate=dir -fprofile-instr-use %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// RUN: %clang -### -S -fprofile-generate=dir -fprofile-instr-use=file %s 2>&1 | FileCheck -check-prefix=CHECK-NO-MIX-GEN-USE %s
+// CHECK-PROFILE-GENERATE: "-fprofile-instr-generate"
+// CHECK-PROFILE-GENERATE-DIR: "-fprofile-instr-generate=/some/dir/default.profraw"
+// CHECK-PROFILE-GENERATE-FILE: "-fprofile-instr-generate=/tmp/somefile.profraw"
+// CHECK-NO-MIX-GEN-USE: '{{[a-z=-]*}}' not allowed with '{{[a-z=-]*}}'
+
+// RUN: %clang -### -S -fprofile-use %s 2>&1 | FileCheck -check-prefix=CHECK-PROFILE-USE %s
+// RUN: %clang -### -S -fprofile-instr-use %s 2>&1 | FileCheck -check-prefix=CHECK-PROFILE-USE %s
+// RUN: mkdir -p %t.d/some/dir
+// RUN: %clang -### -S -fprofile-use=%t.d/some/dir %s 2>&1 | FileCheck -check-prefix=CHECK-PROFILE-USE-DIR %s
+// RUN: %clang -### -S -fprofile-instr-use=/tmp/somefile.prof %s 2>&1 | FileCheck -check-prefix=CHECK-PROFILE-USE-FILE %s
+// CHECK-PROFILE-USE: "-fprofile-instr-use=default.profdata"
+// CHECK-PROFILE-USE-DIR: "-fprofile-instr-use={{.*}}.d/some/dir/default.profdata"
+// CHECK-PROFILE-USE-FILE: "-fprofile-instr-use=/tmp/somefile.prof"
+
// RUN: %clang -### -S -fvectorize %s 2>&1 | FileCheck -check-prefix=CHECK-VECTORIZE %s
// RUN: %clang -### -S -fno-vectorize -fvectorize %s 2>&1 | FileCheck -check-prefix=CHECK-VECTORIZE %s
// RUN: %clang -### -S -fno-vectorize %s 2>&1 | FileCheck -check-prefix=CHECK-NO-VECTORIZE %s
@@ -162,7 +196,6 @@
// RUN: -fprefetch-loop-arrays -fno-prefetch-loop-arrays \
// RUN: -fprofile-correction -fno-profile-correction \
// RUN: -fprofile-dir=bar \
-// RUN: -fprofile-use -fprofile-use=zed -fno-profile-use \
// RUN: -fprofile-values -fno-profile-values \
// RUN: -frounding-math -fno-rounding-math \
// RUN: -fsee -fno-see \
@@ -242,8 +275,6 @@
// RUN: -fno-keep-inline-functions \
// RUN: -freorder-blocks \
// RUN: -fprofile-dir=/rand/dir \
-// RUN: -fprofile-use \
-// RUN: -fprofile-use=/rand/dir \
// RUN: -falign-functions \
// RUN: -falign-functions=1 \
// RUN: -ffloat-store \
@@ -312,8 +343,6 @@
// CHECK-WARNING-DAG: optimization flag '-fno-keep-inline-functions' is not supported
// CHECK-WARNING-DAG: optimization flag '-freorder-blocks' is not supported
// CHECK-WARNING-DAG: optimization flag '-fprofile-dir=/rand/dir' is not supported
-// CHECK-WARNING-DAG: optimization flag '-fprofile-use' is not supported
-// CHECK-WARNING-DAG: optimization flag '-fprofile-use=/rand/dir' is not supported
// CHECK-WARNING-DAG: optimization flag '-falign-functions' is not supported
// CHECK-WARNING-DAG: optimization flag '-falign-functions=1' is not supported
// CHECK-WARNING-DAG: optimization flag '-ffloat-store' is not supported
diff --git a/test/Profile/Inputs/gcc-flag-compatibility.proftext b/test/Profile/Inputs/gcc-flag-compatibility.proftext
new file mode 100644
index 0000000..99d41bb
--- /dev/null
+++ b/test/Profile/Inputs/gcc-flag-compatibility.proftext
@@ -0,0 +1,5 @@
+main
+4
+2
+1
+100
diff --git a/test/Profile/gcc-flag-compatibility.c b/test/Profile/gcc-flag-compatibility.c
new file mode 100644
index 0000000..53a7651
--- /dev/null
+++ b/test/Profile/gcc-flag-compatibility.c
@@ -0,0 +1,48 @@
+// Tests for -fprofile-generate and -fprofile-use flag compatibility. These two
+// flags behave similarly to their GCC counterparts:
+//
+// -fprofile-generate Generates the profile file ./default.profraw
+// -fprofile-generate=<dir> Generates the profile file <dir>/default.profraw
+// -fprofile-use Uses the profile file ./default.profdata
+// -fprofile-use=<dir> Uses the profile file <dir>/default.profdata
+// -fprofile-use=<dir>/file Uses the profile file <dir>/file
+
+// Check that -fprofile-generate uses the runtime default profile file.
+// RUN: %clang %s -c -S -o - -emit-llvm -fprofile-generate | FileCheck -check-prefix=PROFILE-GEN %s
+// PROFILE-GEN: @__llvm_profile_runtime = external global i32
+// PROFILE-GEN-NOT: call void @__llvm_profile_override_default_filename
+// PROFILE-GEN-NOT: declare void @__llvm_profile_override_default_filename(i8*)
+
+// Check that -fprofile-generate=/path/to generates /path/to/default.profraw
+// RUN: %clang %s -c -S -o - -emit-llvm -fprofile-generate=/path/to | FileCheck -check-prefix=PROFILE-GEN-EQ %s
+// PROFILE-GEN-EQ: private constant [25 x i8] c"/path/to/default.profraw\00"
+// PROFILE-GEN-EQ: call void @__llvm_profile_override_default_filename(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @0, i32 0, i32 0))
+// PROFILE-GEN-EQ: declare void @__llvm_profile_override_default_filename(i8*)
+
+// Check that -fprofile-use reads default.profdata
+// RUN: llvm-profdata merge %S/Inputs/gcc-flag-compatibility.proftext -o default.profdata
+// RUN: %clang %s -o - -mllvm -disable-llvm-optzns -emit-llvm -S -fprofile-use | FileCheck -check-prefix=PROFILE-USE-1 %s
+// PROFILE-USE-1: = !{!"branch_weights", i32 101, i32 2}
+
+// Check that -fprofile-use=some/path reads some/path/default.profdata
+// RUN: rm -rf %t.dir
+// RUN: mkdir -p %t.dir/some/path
+// RUN: llvm-profdata merge %S/Inputs/gcc-flag-compatibility.proftext -o %t.dir/some/path/default.profdata
+// RUN: %clang %s -o - -mllvm -disable-llvm-optzns -emit-llvm -S -fprofile-use=%t.dir/some/path | FileCheck -check-prefix=PROFILE-USE-2 %s
+// PROFILE-USE-2: = !{!"branch_weights", i32 101, i32 2}
+
+// Check that -fprofile-use=some/path/file.prof reads some/path/file.prof
+// RUN: rm -rf %t.dir
+// RUN: mkdir -p %t.dir/some/path
+// RUN: llvm-profdata merge %S/Inputs/gcc-flag-compatibility.proftext -o %t.dir/some/path/file.prof
+// RUN: %clang %s -o - -mllvm -disable-llvm-optzns -emit-llvm -S -fprofile-use=%t.dir/some/path/file.prof | FileCheck -check-prefix=PROFILE-USE-3 %s
+// PROFILE-USE-3: = !{!"branch_weights", i32 101, i32 2}
+
+int X = 0;
+
+int main() {
+ int i;
+ for (i = 0; i < 100; i++)
+ X += i;
+ return 0;
+}
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