[OpenMP] Lower printf to __llvm_omp_vprintf

Extension of D112504. Lower amdgpu printf to `__llvm_omp_vprintf`
which takes the same const char*, void* arguments as cuda vprintf and also
passes the size of the void* alloca which will be needed by a non-stub
implementation of `__llvm_omp_vprintf` for amdgpu.

This removes the amdgpu link error on any printf in a target region in favour
of silently compiling code that doesn't print anything to stdout.

The exact set of changes to check-openmp probably needs revision before commit

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D112680

1 files changed, 3 insertions, 4 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index dd60e21..a57bc69 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -4070,10 +4070,9 @@ public:
   RValue EmitCUDAKernelCallExpr(const CUDAKernelCallExpr *E,
                                 ReturnValueSlot ReturnValue);
 
-  RValue EmitNVPTXDevicePrintfCallExpr(const CallExpr *E,
-                                       ReturnValueSlot ReturnValue);
-  RValue EmitAMDGPUDevicePrintfCallExpr(const CallExpr *E,
-                                        ReturnValueSlot ReturnValue);
+  RValue EmitNVPTXDevicePrintfCallExpr(const CallExpr *E);
+  RValue EmitAMDGPUDevicePrintfCallExpr(const CallExpr *E);
+  RValue EmitOpenMPDevicePrintfCallExpr(const CallExpr *E);
 
   RValue EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
                          const CallExpr *E, ReturnValueSlot ReturnValue);