tree 4d29e089a87b5fb82a962b077c05577fe098e392
parent 04f027a29717944fe119ba52f37628c508e2d03c
author keith_miller@apple.com <keith_miller@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1570760617 +0000
committer keith_miller@apple.com <keith_miller@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1570760617 +0000

GenerateAndAllocateRegisters can trivially elide self moves at end of liveness
https://bugs.webkit.org/show_bug.cgi?id=202833

Reviewed by Saam Barati.

This also fixes a bug where if a tmp is moved to itself at the end of its lifetime
we would mess up the accounting for the tmp.

In order to catch these bugs earlier during generation I added a
checkConsistency function that if a tmp is in a reg that reg is
not available and that reg thinks the tmp is also allocated in it.

* b3/B3Bank.h:
(JSC::B3::bankForReg):
* b3/air/AirAllocateRegistersAndStackAndGenerateCode.cpp:
(JSC::B3::Air::GenerateAndAllocateRegisters::checkConsistency):
(JSC::B3::Air::GenerateAndAllocateRegisters::generate):
* b3/air/AirAllocateRegistersAndStackAndGenerateCode.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@250999 268f45cc-cd09-0410-ab3c-d52691b4dbfc