[OpenCL] Fix pipe built-in functions return type.

[bader]

Summary

By default return type of call expressions calling built-in
functions is set to bool.

Fixes https://llvm.org/bugs/show_bug.cgi?id=30219.

[Anastasia]

test/CodeGenOpenCL/pipe_builtin.cl

64

Could you please add similar test for the other two functions: get_pipe_*_packets?

[bader]

Added get_pipe_num_packets and get_pipe_max_packets test cases.

[Anastasia]

LGTM! Thanks!

lib/Sema/SemaChecking.cpp

case Builtin::BI__GetExceptionInfo:
     break;
   // OpenCL v2.0, s6.13.16 - Pipe functions
   case Builtin::BIread_pipe:
   case Builtin::BIwrite_pipe:
     // Since those two functions are declared with var args, we need a semantic
     // check for the argument.
     if (SemaBuiltinRWPipe(*this, TheCall))
       return ExprError();
+    TheCall->setType(Context.IntTy);
     break;
   case Builtin::BIreserve_read_pipe:
   case Builtin::BIreserve_write_pipe:
   case Builtin::BIwork_group_reserve_read_pipe:
   case Builtin::BIwork_group_reserve_write_pipe:
   case Builtin::BIsub_group_reserve_read_pipe:
   case Builtin::BIsub_group_reserve_write_pipe:
     if (SemaBuiltinReserveRWPipe(*this, TheCall))
#include "clang/Basic/Builtins.def"
   case Builtin::BIsub_group_commit_write_pipe:
     if (SemaBuiltinCommitRWPipe(*this, TheCall))
       return ExprError();
     break;
   case Builtin::BIget_pipe_num_packets:
   case Builtin::BIget_pipe_max_packets:
     if (SemaBuiltinPipePackets(*this, TheCall))
       return ExprError();
+    TheCall->setType(Context.UnsignedIntTy);
     break;
   case Builtin::BIto_global:
   case Builtin::BIto_local:
   case Builtin::BIto_private:
     if (SemaOpenCLBuiltinToAddr(*this, BuiltinID, TheCall))
       return ExprError();
     break;
   // OpenCL v2.0, s6.13.17 - Enqueue kernel functions.

test/CodeGenOpenCL/pipe_builtin.cl

 }
 
 void test7(write_only pipe int p, global int *ptr) {
   // CHECK: call i32 @__get_pipe_num_packets(%opencl.pipe_t* %{{.*}})
   *ptr = get_pipe_num_packets(p);
   // CHECK: call i32 @__get_pipe_max_packets(%opencl.pipe_t* %{{.*}})
   *ptr = get_pipe_max_packets(p);
 }
+
+void test8(read_only pipe int r, write_only pipe int w, global int *ptr) {
+  // verify that return type is correctly casted to i1 value
+  // CHECK: %[[R:[0-9]+]] = call i32 @__read_pipe_2
+  // CHECK: icmp ne i32 %[[R]], 0
+  if (read_pipe(r, ptr)) *ptr = -1;
+  // CHECK: %[[W:[0-9]+]] = call i32 @__write_pipe_2
+  // CHECK: icmp ne i32 %[[W]], 0
+  if (write_pipe(w, ptr)) *ptr = -1;
+}