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Add a workaround for Safari 9 ARM iOS right shift by non-immediate zero JIT bug - #7191

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juj merged 1 commit into
emscripten-core:incomingfrom
juj:workaround_ios_9_right_shift_zero_bug
Oct 25, 2018
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Add a workaround for Safari 9 ARM iOS right shift by non-immediate zero JIT bug#7191
juj merged 1 commit into
emscripten-core:incomingfrom
juj:workaround_ios_9_right_shift_zero_bug

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@juj

@juj juj commented Sep 25, 2018

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@juj juj added the iOS label Sep 25, 2018
@kripken

kripken commented Sep 28, 2018

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Perhaps this could be part of LEGACY_VM_SUPPORT?

cc @Brion

@juj

juj commented Oct 3, 2018

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I'd like not to put this as part of LEGACY_VM_SUPPORT, since it would be nicer to keep a more fine grained control. E.g. developer might be interesting in supporting old desktop Internet Explorer 9/10/11 users, but not care about Safari on iOS, or other way around. Instead it would be nice to go to opposite direction of a "catch-all" LEGACY_VM_SUPPORT setting, and use feature and/or browser specific things instead. That way developers can tackle code size in a fine grained way even when they need backward compatibility.

@kripken

kripken commented Oct 4, 2018 •
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@juj I do still think there is a benefit to a catch-all option, people that just want to support all older browsers. But I agree that it shouldn't be the only way for users that want specific things out of that. So how about adding this new option as you suggested, and also enabling it when LEGACY_VM_SUPPORT?

@juj

juj commented Oct 8, 2018

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Yeah, having a enable-all sounds good as well. I'll update this PR and add an option for that.

@juj
juj force-pushed the workaround_ios_9_right_shift_zero_bug branch 2 times, most recently from 9597030 to fcab882 Compare October 10, 2018 09:11
@juj

juj commented Oct 12, 2018

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Pushed updated version of this. @kripken does this look good now?

kripken
kripken approved these changes Oct 12, 2018
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lgtm with that name fixed

Comment thread emcc.py Outdated
# legacy vms don't have wasm
assert not shared.Settings.WASM, 'LEGACY_VM_SUPPORT is only supported for asm.js, and not wasm. Build with -s WASM=0'
shared.Settings.POLYFILL_OLD_MATH_FUNCTIONS = 1
shared.Settings.SUPPORT_IOS_9 = 1

@kripken kripken Oct 12, 2018

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The IOS option has a different name here than elsewhere, which is WORKAROUND_IOS_9_RIGHT_SHIFT_BUG

@juj
juj force-pushed the workaround_ios_9_right_shift_zero_bug branch from fcab882 to 97eccad Compare October 23, 2018 12:07
@juj
juj force-pushed the workaround_ios_9_right_shift_zero_bug branch from 97eccad to 6a90bb4 Compare October 25, 2018 09:24
@juj
juj merged commit b8b8cc7 into emscripten-core:incoming Oct 25, 2018
@juj juj mentioned this pull request Jan 28, 2021
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