roastduck commented on a change in pull request #5498:
URL: https://github.com/apache/incubator-tvm/pull/5498#discussion_r419033202
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File path: src/target/source/intrin_rule_cuda.cc
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@@ -91,6 +106,19 @@ static void DispatchCUDAShuffle(const TVMArgs& args,
TVMRetValue* rv) {
call->dtype, "__shfl", cuda_args, CallNode::PureExtern);
}
+static void DispatchCUDAShuffleSync(const TVMArgs& args, TVMRetValue* rv) {
+ PrimExpr e = args[0];
+ const CallNode* call = e.as<CallNode>();
+ CHECK(call != nullptr);
+ CHECK_EQ(call->args.size(), 4); // value, warp_id/offset, width, warp_size
+
+ // mask is ignored.
+ const std::string& name = CUDAShuffleSync()(call->name);
+ auto mask = IntImm(DataType::UInt(32), 0xFFFFFFFF);
Review comment:
Can we reserve `mask` as an argument? Since it is critical when there
are branch divergence. `0xFFFFFFFF` is only a special case.
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