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Observation of rematerialization.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41809 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2007-09-10 22:11:18 +00:00
parent bf8ae84a21
commit 2d9823875a
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lib/CodeGen/README.txt
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@ -143,3 +143,8 @@ load [T + 7]
...
load [T + 15]
//===---------------------------------------------------------------------===//
It's not always a good idea to choose rematerialization over spilling. If all
the load / store instructions would be folded then spilling is cheaper because
it won't require new live intervals / registers. See 2003-05-31-LongShifts for
an example.