Disable _Float16 for non ARM/SPIR Targets

As Discussed here:
http://lists.llvm.org/pipermail/llvm-dev/2019-January/129543.html

There are problems exposing the _Float16 type on architectures that
haven't defined the ABI/ISel for the type yet, so we're temporarily
disabling the type and making it opt-in.

Differential Revision: https://reviews.llvm.org/D57188

Change-Id: I5db7366dedf1deb9485adb8948b1deb7e612a736
llvm-svn: 352221

4 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index db20ec33e88..7ab3f5808d0 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -34,6 +34,7 @@ TargetInfo::TargetInfo(const llvm::Triple &T) : TargetOpts(), Triple(T) {
   NoAsmVariants = false;
   HasLegalHalfType = false;
   HasFloat128 = false;
+  HasFloat16 = false;
   PointerWidth = PointerAlign = 32;
   BoolWidth = BoolAlign = 8;
   IntWidth = IntAlign = 32;
diff --git a/clang/lib/Basic/Targets/AArch64.cpp b/clang/lib/Basic/Targets/AArch64.cpp
index de591fcea41..a0885a69819 100644
--- a/clang/lib/Basic/Targets/AArch64.cpp
+++ b/clang/lib/Basic/Targets/AArch64.cpp
@@ -49,6 +49,7 @@ AArch64TargetInfo::AArch64TargetInfo(const llvm::Triple &Triple,
 
   // All AArch64 implementations support ARMv8 FP, which makes half a legal type.
   HasLegalHalfType = true;
+  HasFloat16 = true;
 
   LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
   MaxVectorAlign = 128;
diff --git a/clang/lib/Basic/Targets/ARM.cpp b/clang/lib/Basic/Targets/ARM.cpp
index bb89cc7d2eb..f0ebfdd5f71 100644
--- a/clang/lib/Basic/Targets/ARM.cpp
+++ b/clang/lib/Basic/Targets/ARM.cpp
@@ -396,6 +396,7 @@ bool ARMTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
   SoftFloat = SoftFloatABI = false;
   HWDiv = 0;
   DotProd = 0;
+  HasFloat16 = true;
 
   // This does not diagnose illegal cases like having both
   // "+vfpv2" and "+vfpv3" or having "+neon" and "+fp-only-sp".
diff --git a/clang/lib/Basic/Targets/SPIR.h b/clang/lib/Basic/Targets/SPIR.h
index 30f2f0f291f..6023c868dbd 100644
--- a/clang/lib/Basic/Targets/SPIR.h
+++ b/clang/lib/Basic/Targets/SPIR.h
@@ -47,6 +47,7 @@ public:
     AddrSpaceMap = &SPIRAddrSpaceMap;
     UseAddrSpaceMapMangling = true;
     HasLegalHalfType = true;
+    HasFloat16 = true;
     // Define available target features
     // These must be defined in sorted order!
     NoAsmVariants = true;