[Power PC] add soft float support for ppc32
This patch enables soft float support for ppc32 architecture and fixes
the ABI for variadic functions. This is the first in a set of patches
for soft float support in LLVM.
Patch by Strahinja Petrovic.
Differential Revision: http://reviews.llvm.org/D13351
llvm-svn: 255515
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 7a02a11..f843ec4 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -1407,7 +1407,8 @@
return "";
}
-static void getPPCTargetFeatures(const ArgList &Args,
+static void getPPCTargetFeatures(const Driver &D, const llvm::Triple &Triple,
+ const ArgList &Args,
std::vector<const char *> &Features) {
for (const Arg *A : Args.filtered(options::OPT_m_ppc_Features_Group)) {
StringRef Name = A->getOption().getName();
@@ -1431,11 +1432,51 @@
Features.push_back(Args.MakeArgString((IsNegative ? "-" : "+") + Name));
}
+ ppc::FloatABI FloatABI = ppc::getPPCFloatABI(D, Args);
+ if (FloatABI == ppc::FloatABI::Soft &&
+ !(Triple.getArch() == llvm::Triple::ppc64 ||
+ Triple.getArch() == llvm::Triple::ppc64le))
+ Features.push_back("+soft-float");
+ else if (FloatABI == ppc::FloatABI::Soft &&
+ (Triple.getArch() == llvm::Triple::ppc64 ||
+ Triple.getArch() == llvm::Triple::ppc64le))
+ D.Diag(diag::err_drv_invalid_mfloat_abi)
+ << "soft float is not supported for ppc64";
+
// Altivec is a bit weird, allow overriding of the Altivec feature here.
AddTargetFeature(Args, Features, options::OPT_faltivec,
options::OPT_fno_altivec, "altivec");
}
+ppc::FloatABI ppc::getPPCFloatABI(const Driver &D, const ArgList &Args) {
+ ppc::FloatABI ABI = ppc::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 = ppc::FloatABI::Soft;
+ else if (A->getOption().matches(options::OPT_mhard_float))
+ ABI = ppc::FloatABI::Hard;
+ else {
+ ABI = llvm::StringSwitch<ppc::FloatABI>(A->getValue())
+ .Case("soft", ppc::FloatABI::Soft)
+ .Case("hard", ppc::FloatABI::Hard)
+ .Default(ppc::FloatABI::Invalid);
+ if (ABI == ppc::FloatABI::Invalid && !StringRef(A->getValue()).empty()) {
+ D.Diag(diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args);
+ ABI = ppc::FloatABI::Hard;
+ }
+ }
+ }
+
+ // If unspecified, choose the default based on the platform.
+ if (ABI == ppc::FloatABI::Invalid) {
+ ABI = ppc::FloatABI::Hard;
+ }
+
+ return ABI;
+}
+
void Clang::AddPPCTargetArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
// Select the ABI to use.
@@ -1472,6 +1513,21 @@
if (StringRef(A->getValue()) != "altivec")
ABIName = A->getValue();
+ ppc::FloatABI FloatABI =
+ ppc::getPPCFloatABI(getToolChain().getDriver(), Args);
+
+ if (FloatABI == ppc::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 == ppc::FloatABI::Hard && "Invalid float abi!");
+ CmdArgs.push_back("-mfloat-abi");
+ CmdArgs.push_back("hard");
+ }
+
if (ABIName) {
CmdArgs.push_back("-target-abi");
CmdArgs.push_back(ABIName);
@@ -2248,7 +2304,7 @@
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
case llvm::Triple::ppc64le:
- getPPCTargetFeatures(Args, Features);
+ getPPCTargetFeatures(D, Triple, Args, Features);
break;
case llvm::Triple::systemz:
getSystemZTargetFeatures(Args, Features);