[llvm-bugs] [Bug 52578] New: No equivalent for "instcombine-infinite-loop-threshold" in the C API

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52578

            Bug ID: 52578
           Summary: No equivalent for
                    "instcombine-infinite-loop-threshold" in the C API
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: b2.temp at gmx.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

The C API does not allow to control the threshold value that was added with
https://reviews.llvm.org/D71673. For example in pass_manager_builder.h it would
be nice to have `LLVMPassManagerBuilderSetInstCombineThresh`.

Then, the default value for the default set of passes, e.g the set that is
initialized when we use `LLVMPassManagerBuilderPopulateFunctionPassManager`, is
not equal to the value used by opt and infinite loops are still possible.

The request here is to have at least a default value that protect against those
infinite loops.

The consequence is that compilers that use the C API have to optimize by
invoking opt.

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