merrymercy commented on a change in pull request #6042:
URL: https://github.com/apache/incubator-tvm/pull/6042#discussion_r453785929
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File path: src/tir/transforms/unroll_loop.cc
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@@ -57,6 +58,9 @@ struct UnrollLoopConfigNode : public
tvm::AttrsNode<UnrollLoopConfigNode> {
TVM_ATTR_FIELD(explicit_unroll)
.describe("Whether to explicitly unroll the loop instead of setting a
pragma")
.set_default(true);
+ TVM_ATTR_FIELD(explicit_unroll_max_extent)
+ .describe("The maximum extent of a loop that can be unrolled
explicitly (-1 for infinite)")
+ .set_default(32);
Review comment:
I think 32 is a very safe value. How do you know 32 is too large for ARM
CPU?
This value is to avoid the llvm hanging issue, not for performance.
The default value should be large enough to avoid performance regression.
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