Add the __ARM_ARCH_EXT_IDIV__ predefine. It is set to 1 if we have hardware divide in the mode that we are compiling in (depending on the target features), not defined if we don't. Should be compatible with the GCC conterpart. Also adding a -hwdiv option to overide the default behavior.

llvm-svn: 193074

1 files changed, 23 insertions, 0 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 3c98cb38eef..4592308e1a5 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -596,6 +596,27 @@ static void getAArch64FPUFeatures(const Driver &D, const Arg *A,
     D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
 }
 
+// Handle -mhwdiv=.
+static void getARMHWDivFeatures(const Driver &D, const Arg *A,
+                              const ArgList &Args,
+                              std::vector<const char *> &Features) {
+  StringRef HWDiv = A->getValue();
+  if (HWDiv == "arm") {
+    Features.push_back("+hwdiv-arm");
+    Features.push_back("-hwdiv");
+  } else if (HWDiv == "thumb") {
+    Features.push_back("-hwdiv-arm");
+    Features.push_back("+hwdiv");
+  } else if (HWDiv == "arm,thumb" || HWDiv == "thumb,arm") {
+    Features.push_back("+hwdiv-arm");
+    Features.push_back("+hwdiv");
+  } else if (HWDiv == "none") {
+    Features.push_back("-hwdiv-arm");
+    Features.push_back("-hwdiv");
+  } else
+    D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
+}
+ 
 // Handle -mfpu=.
 //
 // FIXME: Centralize feature selection, defaulting shouldn't be also in the
@@ -740,6 +761,8 @@ static void getARMTargetFeatures(const Driver &D, const llvm::Triple &Triple,
   // Honor -mfpu=.
   if (const Arg *A = Args.getLastArg(options::OPT_mfpu_EQ))
     getARMFPUFeatures(D, A, Args, Features);
+  if (const Arg *A = Args.getLastArg(options::OPT_mhwdiv_EQ))
+    getARMHWDivFeatures(D, A, Args, Features);
 
   // Setting -msoft-float effectively disables NEON because of the GCC
   // implementation, although the same isn't true of VFP or VFP3.