Add support for llvm.lround.* (#2904)

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@8ef84d23d874791

Author: bwlodarcz

llvm-spirv/lib/SPIRV/SPIRVWriter.cpp

@@ -4220,6 +4220,14 @@ SPIRVValue *LLVMToSPIRVBase::transIntrinsicInst(IntrinsicInst *II,
     return BM->addExtInst(STy, BM->getExtInstSetId(SPIRVEIS_OpenCL), ExtOp, Ops,
                           BB);
   }
+  case Intrinsic::lround: {
+    SPIRVType *SourceTy = transType(II->getArgOperand(0)->getType());
+    SPIRVType *DestTy = transType(II->getType());
+    SPIRVValue *Rounded = BM->addExtInst(
+        SourceTy, BM->getExtInstSetId(SPIRVEIS_OpenCL), OpenCLLIB::Round,
+        {transValue(II->getArgOperand(0), BB)}, BB);
+    return BM->addUnaryInst(OpConvertFToS, DestTy, Rounded, BB);
+  }
   case Intrinsic::frexp: {
     if (!checkTypeForSPIRVExtendedInstLowering(II, BM))
       break;

llvm-spirv/test/llvm-intrinsics/lround.ll

@@ -0,0 +1,32 @@
+; REQUIRES: spirv-dis
+; RUN: llvm-as %s -o %t.bc
+; RUN: llvm-spirv %t.bc -o %t.spv
+; RUN: spirv-dis --raw-id %t.spv | FileCheck --check-prefix CHECK-SPIRV %s
+; RUN: spirv-val %t.spv 
+
+; CHECK-SPIRV:          [[opencl:%[0-9]+]] = OpExtInstImport "OpenCL.std"
+; CHECK-SPIRV-DAG:      [[i32:%[0-9]+]] = OpTypeInt 32 0
+; CHECK-SPIRV-DAG:      [[i64:%[0-9]+]] = OpTypeInt 64 0
+; CHECK-SPIRV-DAG:      [[f32:%[0-9]+]] = OpTypeFloat 32
+; CHECK-SPIRV-DAG:      [[f64:%[0-9]+]] = OpTypeFloat 64
+; CHECK-SPIRV:      [[rounded_f32:%[0-9]+]] = OpExtInst [[f32]] [[opencl]] round
+; CHECK-SPIRV:                        OpConvertFToS [[i32]] [[rounded_f32]]
+; CHECK-SPIRV:      [[rounded_f64:%[0-9]+]] = OpExtInst [[f64]] [[opencl]] round
+; CHECK-SPIRV:                        OpConvertFToS [[i64]] [[rounded_f64]]
+
+target triple = "spir64-unknown-unknown"
+
+define spir_func i32 @test_0(float %arg0) {
+entry:
+  %0 = call i32 @llvm.lround.i32.f32(float %arg0)
+  ret i32 %0
+}
+
+define spir_func i64 @test_1(double %arg0) {
+entry:
+  %0 = call i64 @llvm.lround.i64.f64(double %arg0)
+  ret i64 %0
+}
+
+declare i32 @llvm.lround.i32.f32(float)
+declare i64 @llvm.lround.i64.f64(double)