junrushao1994 commented on a change in pull request #7045:
URL: https://github.com/apache/tvm/pull/7045#discussion_r548436987
##########
File path: src/arith/canonical_simplify.cc
##########
@@ -77,6 +77,25 @@ inline PrimExpr DivImpl(PrimExpr a, PrimExpr b, DivMode
mode) {
}
}
+bool CheckCastImpl(DataType dtype, PrimExpr value, Analyzer* analyzer) {
+ if (!IsIndexType(dtype)) {
+ return false;
+ }
+ ConstIntBound bound = analyzer->const_int_bound(value);
+ int64_t ubound = Downcast<IntImm>(max_value(dtype))->value;
+ int64_t lbound = Downcast<IntImm>(min_value(dtype))->value;
+ if (value.dtype().bits() <= dtype.bits() || // upcast is safe
+ (bound->max_value <= ubound && bound->min_value >= lbound)) {
+ return true;
+ }
+ return false;
+}
+
+#define CHECK_CAST(DTYPE, VALUE) \
Review comment:
Always prefix macro with `TVM_` (except for glog-style checks). Also
please use a tedious name to avoid conflicts and remember to #undef it when it
is not used any more
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