Fixed errors in mixed precision mode

platforms/opencl/src/OpenCLIntegrationUtilities.cpp

@@ -977,7 +977,7 @@ double OpenCLIntegrationUtilities::computeKineticEnergy(double timeShift) {
 
         timeShiftKernel.setArg<cl::Buffer>(0, context.getVelm().getDeviceBuffer());
         timeShiftKernel.setArg<cl::Buffer>(1, context.getForce().getDeviceBuffer());
-        if (context.getUseDoublePrecision() || context.getUseMixedPrecision())
+        if (context.getUseDoublePrecision())
             timeShiftKernel.setArg<cl_double>(2, timeShift);
         else
             timeShiftKernel.setArg<cl_float>(2, (cl_float) timeShift);

platforms/opencl/src/kernels/integrationUtilities.cl

@@ -5,7 +5,8 @@ __kernel void timeShiftVelocities(__global mixed4* restrict velm, __global const
     for (int index = get_global_id(0); index < NUM_ATOMS; index += get_global_size(0)) {
         mixed4 velocity = velm[index];
         if (velocity.w != 0.0) {
-            velocity.xyz += timeShift*force[index].xyz*velocity.w;
+            mixed4 f = convert_mixed4(force[index]);
+            velocity.xyz += timeShift*f.xyz*velocity.w;
             velm[index] = velocity;
         }
     }