AndrewZhaoLuo commented on code in PR #10922:
URL: https://github.com/apache/tvm/pull/10922#discussion_r845307339
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src/tir/op/op.cc:
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@@ -653,7 +653,27 @@ PrimExpr abs(PrimExpr x, Span span) {
if (px) {
return IntImm(x.dtype(), std::abs(px->value), px->span);
}
- return tir::Select(x >= make_zero(x.dtype()), x, -x, span);
+
Review Comment:
Hmm honestly I'm not sure if I like this change since it actually is a
change in the semantics of abs.
E.g. abs(-128) = 128 which should overflow to -128 with only 8 bits.
IMO two solutions:
1. For integers, make it return uint version so it never overflows.
2. Just handle the edge case manually in fq2i
If I understand this is only important to handle the -128 --> 127 case in
quantized models so I say just put it in 2.
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