http://llvm.org/bugs/show_bug.cgi?id=14047
Bug #: 14047
Summary: Inliner still needs some tweaking for recursive
functions
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Interprocedural Optimizations
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 9324
--> http://llvm.org/bugs/attachment.cgi?id=9324
testcase
Now that pr13700 is fixed I tried removing some of the noinlines we added to
mozilla because of it. Unfortunately, llvm is still fairly aggressive in
inlining into a recursive function.
In the attached testcase gcc 4.7 produces a EmitTree function that uses about
360 bytes of stack frame. By changing TotalAllocaSizeRecursiveCaller in llvm I
got:
1 -> 88 bytes
2 -> 88 bytes
4 -> 88 bytes
8 -> 88 bytes
16 -> 88 bytes
32 -> 88 bytes
64 -> 824 bytes
128 -> 1000 bytes
256 -> 1336 bytes
512 -> 1336 bytes
1024 -> 1336 bytes
Maybe TotalAllocaSizeRecursiveCaller should be a ratio?
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