It is a meta bug to collect MIPS related bugs.
FYI, you may be interested by https://bugs.webkit.org/show_bug.cgi?id=119794 if you generate debug builds of JSC for mips.
With the following patches and with JIT disabled (so, only LLInt), the tests in Source/JavaScriptCore/tests/stress all pass on qemu/MIPS for me (except impure-get-own-property-slot-inline-cache.js which seems to fail on other platforms with JIT disabled): https://bugs.webkit.org/show_bug.cgi?id=150376 https://bugs.webkit.org/show_bug.cgi?id=150380 https://bugs.webkit.org/show_bug.cgi?id=150381 https://bugs.webkit.org/show_bug.cgi?id=150403 https://bugs.webkit.org/show_bug.cgi?id=150412
If I apply the following patches to a recent-ish trunk, and run JavaScriptCore/regress and JavaScriptCore/stress, I only get two tests that fail (enabling both JIT and DFG) https://bugs.webkit.org/show_bug.cgi?id=153463 https://bugs.webkit.org/show_bug.cgi?id=153464