https://bugs.llvm.org/show_bug.cgi?id=50486
Bug ID: 50486
Summary: Deficiency in 'if' compared to 'foreach' with cast in
TableGen
Product: tools
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: TableGen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 24894
--> https://bugs.llvm.org/attachment.cgi?id=24894&action=edit
reproducer and counterexamples
The Tablegen if statement introduced in https://reviews.llvm.org/D71474 seems
to have a deficiency compared to foreach, when using casts. The attached case
shows an example where this happens, and it is a reduced version of what
happens in the AMDGPU backend.
The error message is "attempting to loop over
'!if(!cast<with_field>("instance").val, [1], [])', expected a list" which is
the code the 'if ... then' is expanded to in llvm/lib/TableGen/TGParser.cpp.
However,I could not figure out a fix while looking at this file.
The equivalent formation the statement using foreach works.
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