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[clang] -falign-loops=

This commit is contained in:
Fangrui Song 2021-07-23 09:38:18 -07:00
parent 13f95cc3d1
commit 42896eeed9
6 changed files with 18 additions and 1 deletions
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2
clang/include/clang/Basic/CodeGenOptions.def
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@ -293,6 +293,8 @@ CODEGENOPT(StackRealignment , 1, 0) ///< Control whether to force stack
///< realignment.
CODEGENOPT(UseInitArray , 1, 0) ///< Control whether to use .init_array or
///< .ctors.
VALUE_CODEGENOPT(LoopAlignment , 32, 0) ///< Overrides default loop
///< alignment, if not 0.
VALUE_CODEGENOPT(StackAlignment , 32, 0) ///< Overrides default stack
///< alignment, if not 0.
VALUE_CODEGENOPT(StackProbeSize , 32, 4096) ///< Overrides default stack

1
clang/include/clang/Basic/LangOptions.def
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@ -396,6 +396,7 @@ ENUM_LANGOPT(ClangABICompat, ClangABI, 4, ClangABI::Latest,
"with")
COMPATIBLE_VALUE_LANGOPT(FunctionAlignment, 5, 0, "Default alignment for functions")
COMPATIBLE_VALUE_LANGOPT(LoopAlignment, 4, 0, "Default alignment for loops")
LANGOPT(FixedPoint, 1, 0, "fixed point types")
LANGOPT(PaddingOnUnsignedFixedPoint, 1, 0,

3
clang/include/clang/Driver/Options.td
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@ -1064,6 +1064,8 @@ defm access_control : BoolFOption<"access-control",
PosFlag<SetTrue>>;
def falign_functions : Flag<["-"], "falign-functions">, Group<f_Group>;
def falign_functions_EQ : Joined<["-"], "falign-functions=">, Group<f_Group>;
def falign_loops_EQ : Joined<["-"], "falign-loops=">, Group<f_Group>,
MarshallingInfoInt<CodeGenOpts<"LoopAlignment">>;
def fno_align_functions: Flag<["-"], "fno-align-functions">, Group<f_Group>;
defm allow_editor_placeholders : BoolFOption<"allow-editor-placeholders",
LangOpts<"AllowEditorPlaceholders">, DefaultFalse,
@ -4293,7 +4295,6 @@ def ld_path_EQ : Joined<["--"], "ld-path=">, Group<Link_Group>;
defm align_labels : BooleanFFlag<"align-labels">, Group<clang_ignored_gcc_optimization_f_Group>;
def falign_labels_EQ : Joined<["-"], "falign-labels=">, Group<clang_ignored_gcc_optimization_f_Group>;
defm align_loops : BooleanFFlag<"align-loops">, Group<clang_ignored_gcc_optimization_f_Group>;
def falign_loops_EQ : Joined<["-"], "falign-loops=">, Group<clang_ignored_gcc_optimization_f_Group>;
defm align_jumps : BooleanFFlag<"align-jumps">, Group<clang_ignored_gcc_optimization_f_Group>;
def falign_jumps_EQ : Joined<["-"], "falign-jumps=">, Group<clang_ignored_gcc_optimization_f_Group>;

2
clang/lib/CodeGen/BackendUtil.cpp
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@ -581,6 +581,8 @@ static bool initTargetOptions(DiagnosticsEngine &Diags,
CodeGenOpts.ValueTrackingVariableLocations;
Options.XRayOmitFunctionIndex = CodeGenOpts.XRayOmitFunctionIndex;
Options.LoopAlignment = CodeGenOpts.LoopAlignment;
Options.MCOptions.SplitDwarfFile = CodeGenOpts.SplitDwarfFile;
Options.MCOptions.MCRelaxAll = CodeGenOpts.RelaxAll;
Options.MCOptions.MCSaveTempLabels = CodeGenOpts.SaveTempLabels;

9
clang/lib/Driver/ToolChains/Clang.cpp
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@ -4720,6 +4720,15 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
CmdArgs.push_back(Args.MakeArgString(std::to_string(FunctionAlignment)));
}
if (const Arg *A = Args.getLastArg(options::OPT_falign_loops_EQ)) {
unsigned Value = 0;
if (StringRef(A->getValue()).getAsInteger(10, Value) || Value > 65536)
TC.getDriver().Diag(diag::err_drv_invalid_int_value)
<< A->getAsString(Args) << A->getValue();
Value = Value ? 1u << llvm::Log2_32_Ceil(std::min(Value, 65536u)) : 0;
CmdArgs.push_back(Args.MakeArgString("-falign-loops=" + Twine(Value)));
}
llvm::Reloc::Model RelocationModel;
unsigned PICLevel;
bool IsPIE;

2
llvm/include/llvm/Target/TargetOptions.h
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@ -328,6 +328,8 @@ namespace llvm {
/// passed on the command line.
std::string StackUsageOutput;
unsigned LoopAlignment = 0;
/// FloatABIType - This setting is set by -float-abi=xxx option is specfied
/// on the command line. This setting may either be Default, Soft, or Hard.
/// Default selects the target's default behavior. Soft selects the ABI for