cbalint13 commented on code in PR #18586:
URL: https://github.com/apache/tvm/pull/18586#discussion_r2617613861
##########
src/target/llvm/codegen_aarch64.cc:
##########
@@ -59,9 +59,11 @@ void CodeGenAArch64::SetTargetAttributes(llvm::Function*
func) {
// Add vscale_range() function attribute when appropriate.
if (llvm_target_->TargetHasCPUFeature("sve") ||
llvm_target_->TargetHasCPUFeature("sme")) {
auto kVScaleValues = arith::GetVScaleValues(Target::Current());
- unsigned int max_val = *std::max_element(kVScaleValues.begin(),
kVScaleValues.end());
- func->addFnAttr(
- llvm::Attribute::getWithVScaleRangeArgs(*llvm_target_->GetContext(),
1, max_val));
+ if (!kVScaleValues.empty()) {
Review Comment:
It would be fine to protect this way, but we will miss the origin of issue.
My concern is that if we have sve/sme present why the list is empty !?,
For a proper fix, I would be courious what is the string value of
```target``` and what value have ```vector_width``` Here is the generator part
that populates:
https://github.com/apache/tvm/blame/6248b5db43505fbcfb13cc289d11877d5d2649e8/src/arith/scalable_expression.cc#L114
.
I am afraid that TVM fails to pickup proper ```vector_width``` during
initial parsing of arch properties based on target provided.
If could help me with these two info i can come up with a proper fix, I
could also go the long way to test it on arm machine but than I need a clear
reproducer case.
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