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authorEvan Cheng <evan.cheng@apple.com>2007-10-12 08:50:34 +0000
committerEvan Cheng <evan.cheng@apple.com>2007-10-12 08:50:34 +0000
commit32dfbeada7292167bb488f36a71a5a6a519ddaff (patch)
tree31e4a518a9a2e6d39858b20921f868948a28ec0b /test/CodeGen/X86/2007-10-12-CoalesceExtSubReg.ll
parent10136e7c7f599a559917e04f04e6dfbf025e451b (diff)
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EXTRACT_SUBREG coalescing support. The coalescer now treats EXTRACT_SUBREG like
(almost) a register copy. However, it always coalesced to the register of the RHS (the super-register). All uses of the result of a EXTRACT_SUBREG are sub- register uses which adds subtle complications to load folding, spiller rewrite, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42899 91177308-0d34-0410-b5e6-96231b3b80d8
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