[Sparc] Add software float option -msoft-float
Summary:
Following patch D19265 which enable software floating point support in the Sparc backend, this patch enables the option to be enabled in the front-end using the -msoft-float option.
The user should ensure a library (such as the builtins from Compiler-RT) that includes the software floating point routines is provided.
Reviewers: jyknight, lero_chris
Subscribers: jyknight, cfe-commits
Differential Revision: http://reviews.llvm.org/D20419
llvm-svn: 270538
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index b45a118..67bce6b 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -1640,28 +1640,67 @@
return "";
}
+sparc::FloatABI sparc::getSparcFloatABI(const Driver &D,
+ const ArgList &Args) {
+ sparc::FloatABI ABI = sparc::FloatABI::Invalid;
+ if (Arg *A =
+ Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
+ options::OPT_mfloat_abi_EQ)) {
+ if (A->getOption().matches(options::OPT_msoft_float))
+ ABI = sparc::FloatABI::Soft;
+ else if (A->getOption().matches(options::OPT_mhard_float))
+ ABI = sparc::FloatABI::Hard;
+ else {
+ ABI = llvm::StringSwitch<sparc::FloatABI>(A->getValue())
+ .Case("soft", sparc::FloatABI::Soft)
+ .Case("hard", sparc::FloatABI::Hard)
+ .Default(sparc::FloatABI::Invalid);
+ if (ABI == sparc::FloatABI::Invalid &&
+ !StringRef(A->getValue()).empty()) {
+ D.Diag(diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args);
+ ABI = sparc::FloatABI::Hard;
+ }
+ }
+ }
+
+ // If unspecified, choose the default based on the platform.
+ // Only the hard-float ABI on Sparc is standardized, and it is the
+ // default. GCC also supports a nonstandard soft-float ABI mode, also
+ // implemented in LLVM. However as this is not standard we set the default
+ // to be hard-float.
+ if (ABI == sparc::FloatABI::Invalid) {
+ ABI = sparc::FloatABI::Hard;
+ }
+
+ return ABI;
+}
+
+static void getSparcTargetFeatures(const Driver &D, const ArgList &Args,
+ std::vector<const char *> &Features) {
+ sparc::FloatABI FloatABI = sparc::getSparcFloatABI(D, Args);
+ if (FloatABI == sparc::FloatABI::Soft)
+ Features.push_back("+soft-float");
+}
+
void Clang::AddSparcTargetArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
- const Driver &D = getToolChain().getDriver();
+ //const Driver &D = getToolChain().getDriver();
std::string Triple = getToolChain().ComputeEffectiveClangTriple(Args);
- bool SoftFloatABI = false;
- if (Arg *A =
- Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float)) {
- if (A->getOption().matches(options::OPT_msoft_float))
- SoftFloatABI = true;
- }
+ sparc::FloatABI FloatABI =
+ sparc::getSparcFloatABI(getToolChain().getDriver(), Args);
- // Only the hard-float ABI on Sparc is standardized, and it is the
- // default. GCC also supports a nonstandard soft-float ABI mode, and
- // perhaps LLVM should implement that, too. However, since llvm
- // currently does not support Sparc soft-float, at all, display an
- // error if it's requested.
- if (SoftFloatABI) {
- D.Diag(diag::err_drv_unsupported_opt_for_target) << "-msoft-float"
- << Triple;
+ if (FloatABI == sparc::FloatABI::Soft) {
+ // Floating point operations and argument passing are soft.
+ CmdArgs.push_back("-msoft-float");
+ CmdArgs.push_back("-mfloat-abi");
+ CmdArgs.push_back("soft");
+ } else {
+ // Floating point operations and argument passing are hard.
+ assert(FloatABI == sparc::FloatABI::Hard && "Invalid float abi!");
+ CmdArgs.push_back("-mfloat-abi");
+ CmdArgs.push_back("hard");
}
-
}
void Clang::AddSystemZTargetArgs(const ArgList &Args,
@@ -2478,6 +2517,11 @@
case llvm::Triple::wasm32:
case llvm::Triple::wasm64:
getWebAssemblyTargetFeatures(Args, Features);
+ break;
+ case llvm::Triple::sparc:
+ case llvm::Triple::sparcel:
+ case llvm::Triple::sparcv9:
+ getSparcTargetFeatures(D, Args, Features);
break;
case llvm::Triple::r600:
case llvm::Triple::amdgcn: