Glad to!
By the way, I don't find that LTO brings any performance improvements
compared to a non-LTO builds (on latests Emscripten backend). Maybe +1%
at most (more probably benchmark noise to me), but sometime more than
10% worse, and at the expense of a *significant *link time increase and
*significant *binary size increase!
So I am not sure this is really an interesting option anymore...
Le 28/02/2020 à 11:14, Floh a écrit :
Whoops, thanks for making me aware of WASM_OBJECT_FILES being 1 by
default... I've been building with LTO all the time (since the asm.js
days) and was expecting that the WASM backend would behave identically
there.
-Floh.
On Friday, 28 February 2020 10:07:11 UTC+1, Gabriel CV wrote:
Hi,
Try to remove --llvm-lto 3, as it might increase binary size
significantly when combined with -O2 or -O3 (and I am not sure it
is very usefull without using -DWASM_OBJECT_FILES=0)
Le 28/02/2020 à 08:12, Rohit Saini a écrit :
Hi All,
Previously we were using 1.38.28 emscripten version. Recently we
updated to latest llvm backend 1.39.7. But with new backend there
is drastic increase in wasm size. Size of my side modules become
almost double and size of my main module also increased from
2.7mb to almost 4mb. Firstly we are compiling to object files
then we are linking them to make wasm. Below are the flags I am
passing while compiling and linking. Is this size increase
intentional or do I have to change compiling or linking flags
someway.
Compiling flags for main module:
-Oz -fPIC
-s DISABLE_EXCEPTION_CATCHING=0 -Wno-builtin-macro-redefined
-Wno-dollar-in-identifier-extension
Compiling flags for side module:
-std=c++14 -fPIC
Linking flags for main module:
-O3 -s EVAL_CTORS=0 --closure
0 -s ALIASING_FUNCTION_POINTERS=0 -s ELIMINATE_DUPLICATE_FUNCTIONS=1 -s
ELIMINATE_DUPLICATE_FUNCTIONS_PASSES=12 --llvm-lto 3 -s
FORCE_FILESYSTEM=1 -s ERROR_ON_UNDEFINED_SYMBOLS=0 -s
'EXTRA_EXPORTED_RUNTIME_METHODS=["getTempRet0","setTempRet0", "cwrap"]' -s
[email protected] <javascript:>
-s DISABLE_EXCEPTION_CATCHING=2 -s
[email protected]
<javascript:>
Linking flags for side module:
-s SIDE_MODULE=1 -s WASM=1 -Oz -s EVAL_CTORS=0 --closure 0 -s
ALIASING_FUNCTION_POINTERS=0 -s ELIMINATE_DUPLICATE_FUNCTIONS=1
-s ELIMINATE_DUPLICATE_FUNCTIONS_PASSES=12 --llvm-lto 3 -s
ERROR_ON_UNDEFINED_SYMBOLS=0
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