Implement builtins for Neon half-precision float conversions.

Also tweak the VCVT_F32_F16 entry in arm_neon.td to be more consistent with
the other floating-point conversion builtins.  Radar 8068427.

llvm-svn: 121916

1 files changed, 10 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 19c3fbb1fa5..3fc5efd7f32 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -1226,7 +1226,16 @@ Value *CodeGenFunction::EmitARMBuiltinExpr(unsigned BuiltinID,
     Function *F = CGM.getIntrinsic(Intrinsic::arm_neon_vcnt, &Ty, 1);
     return EmitNeonCall(F, Ops, "vcnt");
   }
-  // FIXME: intrinsics for f16<->f32 convert missing from ARM target.
+  case ARM::BI__builtin_neon_vcvt_f16_v: {
+    assert((type & 0x7) == 7 && !quad && "unexpected vcvt_f16_v builtin");
+    Function *F = CGM.getIntrinsic(Intrinsic::arm_neon_vcvtfp2hf);
+    return EmitNeonCall(F, Ops, "vcvt");
+  }
+  case ARM::BI__builtin_neon_vcvt_f32_f16: {
+    assert((type & 0x7) == 7 && !quad && "unexpected vcvt_f32_f16 builtin");
+    Function *F = CGM.getIntrinsic(Intrinsic::arm_neon_vcvthf2fp);
+    return EmitNeonCall(F, Ops, "vcvt");
+  }
   case ARM::BI__builtin_neon_vcvt_f32_v:
   case ARM::BI__builtin_neon_vcvtq_f32_v: {
     Ops[0] = Builder.CreateBitCast(Ops[0], Ty);