Emit error for LLVM bfloat type (#3047)

Signed-off-by: Arvind Sudarsanam <[email protected]>

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@5bda7566d980a71

Author: asudarsa

llvm-spirv/lib/SPIRV/SPIRVWriter.cpp

@@ -401,6 +401,9 @@ SPIRVType *LLVMToSPIRVBase::transType(Type *T) {
     }
   }
 
+  // Emit error if type is bfloat. LLVM native bfloat type is not supported.
+  BM->getErrorLog().checkError(!T->isBFloatTy(),
+                               SPIRVEC_UnsupportedLLVMBFloatType);
   if (T->isFloatingPointTy())
     return mapType(T, BM->addFloatType(T->getPrimitiveSizeInBits()));
 

llvm-spirv/lib/SPIRV/libSPIRV/SPIRVErrorEnum.h

@@ -28,6 +28,8 @@ _SPIRV_OP(UnspecifiedMemoryModel, "Unspecified Memory Model.")
 _SPIRV_OP(RepeatedMemoryModel, "Expects a single OpMemoryModel instruction.")
 _SPIRV_OP(UnsupportedVarArgFunction,
           "Variadic functions other than 'printf' are not supported in SPIR-V.")
+_SPIRV_OP(UnsupportedLLVMBFloatType,
+          "LLVM bfloat type is not supported in SPIR-V.")
 
 /* This is the last error code to have a maximum valid value to compare to */
 _SPIRV_OP(InternalMaxErrorCode, "Unknown error code")

llvm-spirv/test/bfloat.ll

@@ -0,0 +1,22 @@
+; Check that translator emits error for LLVM bfloat type
+; RUN: llvm-as %s -o %t.bc
+; RUN: not llvm-spirv --spirv-ext=+all %t.bc -o %t.spv 2>&1 | FileCheck %s --check-prefix=CHECK-ERROR
+
+; CHECK-ERROR: UnsupportedLLVMBFloatType: LLVM bfloat type is not supported in SPIR-V
+
+target datalayout = "e-p:32:32-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024"
+target triple = "spir-unknown-unknown"
+
+; Function Attrs: nounwind
+define spir_kernel void @testBFloat(bfloat %a, bfloat %b) {
+entry:
+  %r1 = fmul bfloat %a, %b
+  ret void
+}
+
+!llvm.module.flags = !{!0}
+!opencl.ocl.version = !{!1}
+!opencl.spir.version = !{!1}
+
+!0 = !{i32 1, !"wchar_size", i32 4}
+!1 = !{i32 2, i32 0}