https://bugs.llvm.org/show_bug.cgi?id=40892
Bug ID: 40892
Summary: Large number of locals in zlib output
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: WebAssembly
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 21517
--> https://bugs.llvm.org/attachment.cgi?id=21517&action=edit
cheerp output for comparison
Comparing to cheerp, the core $deflate function in their output has 7 locals,
while the wasm backend's version has 85. This may explain why the size of the
function is much larger.
I'm not sure what's going on here. One pattern I noticed is constants with one
set and one get (e.g., 11664 - might help to search for that const). There are
'runs' of such assignments to locals (each with a different value), and they
all have this pattern. They also seem to end up used in the same code area
later. I guess they are a bunch of phis, with the other value being the zero
initialization (does LLVM use that?).
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