r233135 - [CodeGen] Support native half inc/dec amounts.

[Ahmed Bougacha]

Author: ab
Date: Tue Mar 24 18:44:42 2015
New Revision: 233135

URL: http://llvm.org/viewvc/llvm-project?rev=233135&view=rev
Log:
[CodeGen] Support native half inc/dec amounts.

We previously defaulted to long double, but it's also possible to have
a half inc/dec amount, when LangOpts NativeHalfType is set.
Currently, that's only true for OpenCL.

Modified:
    cfe/trunk/lib/CodeGen/CGExprScalar.cpp
    cfe/trunk/test/CodeGenOpenCL/half.cl

Modified: cfe/trunk/lib/CodeGen/CGExprScalar.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGExprScalar.cpp?rev=233135&r1=233134&r2=233135&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGExprScalar.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGExprScalar.cpp Tue Mar 24 18:44:42 2015
@@ -1800,9 +1800,14 @@ ScalarExprEmitter::EmitScalarPrePostIncD
       amt = llvm::ConstantFP::get(VMContext,
                                   llvm::APFloat(static_cast<double>(amount)));
     else {
+      // Remaining types are either Half or LongDouble.  Convert from float.
       llvm::APFloat F(static_cast<float>(amount));
       bool ignored;
-      F.convert(CGF.getTarget().getLongDoubleFormat(),
+      // Don't use getFloatTypeSemantics because Half isn't
+      // necessarily represented using the "half" LLVM type.
+      F.convert(value->getType()->isHalfTy()
+                    ? CGF.getTarget().getHalfFormat()
+                    : CGF.getTarget().getLongDoubleFormat(),
                 llvm::APFloat::rmTowardZero, &ignored);
       amt = llvm::ConstantFP::get(VMContext, F);
     }

Modified: cfe/trunk/test/CodeGenOpenCL/half.cl
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenOpenCL/half.cl?rev=233135&r1=233134&r2=233135&view=diff
==============================================================================
--- cfe/trunk/test/CodeGenOpenCL/half.cl (original)
+++ cfe/trunk/test/CodeGenOpenCL/half.cl Tue Mar 24 18:44:42 2015
@@ -13,3 +13,11 @@ half test()
    return z;
 // CHECK: half 0xH3260
 }
+
+// CHECK-LABEL: @test_inc(half %x)
+// CHECK: [[INC:%.*]] = fadd half %x, 0xH3C00
+// CHECK: ret half [[INC]]
+half test_inc(half x)
+{
+  return ++x;
+}