[PATCH] D63876: [OpenCL] Define CLK_NULL_EVENT without cast

[Sven van Haastregt via Phabricator via cfe-commits]

svenvh created this revision.
svenvh added reviewers: Anastasia, yaxunl.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Defining CLK_NULL_EVENT with a `(void*)` cast has the (unintended?)
side-effect that the address space will be fixed (as generic in OpenCL
2.0 mode).  The consequence is that any target specific address space
for the clk_event_t type will not be applied.

It is not clear why the void pointer cast was needed in the first
place, and it seems we can do without it.


Repository:
  rC Clang

https://reviews.llvm.org/D63876

Files:
  lib/Headers/opencl-c-base.h
  test/SemaOpenCL/clk_event_t.cl


Index: test/SemaOpenCL/clk_event_t.cl
===================================================================
--- test/SemaOpenCL/clk_event_t.cl
+++ test/SemaOpenCL/clk_event_t.cl
@@ -2,7 +2,7 @@
 // RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only -cl-std=c++
 
 // Taken from opencl-c.h
-#define CLK_NULL_EVENT (__builtin_astype(((void*)(__SIZE_MAX__)), clk_event_t))
+#define CLK_NULL_EVENT (__builtin_astype(((__SIZE_MAX__)), clk_event_t))
 
 global clk_event_t ce; // expected-error {{the '__global clk_event_t' type cannot be used to declare a program scope variable}}
 
@@ -10,6 +10,7 @@
   event_t e;
   clk_event_t ce1;
   clk_event_t ce2;
+  clk_event_t ce3 = CLK_NULL_EVENT;
 
   if (e == ce1) { // expected-error {{invalid operands to binary expression ('event_t' and 'clk_event_t')}}
     return 9;
Index: lib/Headers/opencl-c-base.h
===================================================================
--- lib/Headers/opencl-c-base.h
+++ lib/Headers/opencl-c-base.h
@@ -413,7 +413,7 @@
 #define CLK_OUT_OF_RESOURCES                        -5
 
 #define CLK_NULL_QUEUE                              0
-#define CLK_NULL_EVENT (__builtin_astype(((void*)(__SIZE_MAX__)), clk_event_t))
+#define CLK_NULL_EVENT (__builtin_astype(((__SIZE_MAX__)), clk_event_t))
 
 // execution model related definitions
 #define CLK_ENQUEUE_FLAGS_NO_WAIT                   0x0


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