> On Sep 16, 2018, at 5:59 PM, Filip Pizlo <fpi...@apple.com> wrote:
> 
> Which offline assembler build step are you referring to?

The one that is the “Offline Assembler” target in Xcode, which runs this 
command:

ruby JavaScriptCore/offlineasm/asm.rb 
JavaScriptCore/llint/LowLevelInterpreter.asm 
"${BUILT_PRODUCTS_DIR}/JSCLLIntOffsetsExtractor” LLIntAssembly.h

For a “nothing rebuild” of all of WebKit and all of Safari for iOS on my iMac, 
it takes about 10 seconds out of a 30 second total “build" time.

Looking more carefully at the build log now, it seems that recompiling 
LLIntOffsetExtractor.cpp is also taking multiple seconds. Not executing 
generate_offset_extractor.rb, but compiling the output.

— Darin
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