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3 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen c332e727b4 Precompute block frequencies, pow() isn't free. 
llvm-svn: 126975
 2011-03-04 00:58:40 +00:00
Jakob Stoklund Olesen 267f6c1ab2 Add RAGreedy methods for splitting live ranges around regions. 
Analyze the live range's behavior entering and leaving basic blocks. Compute an
interference pattern for each allocation candidate, and use SpillPlacement to
find an optimal region where that register can be live.

This code is still not enabled.

llvm-svn: 123774
 2011-01-18 21:13:27 +00:00
Jakob Stoklund Olesen 8e236eac74 Add the SpillPlacement analysis pass. 
This pass precomputes CFG block frequency information that can be used by the
register allocator to find optimal spill code placement.

Given an interference pattern, placeSpills() will compute which basic blocks
should have the current variable enter or exit in a register, and which blocks
prefer the stack.

The algorithm is ready to consume block frequencies from profiling data, but for
now it gets by with the static estimates used for spill weights.

This is a work in progress and still not hooked up to RegAllocGreedy.

llvm-svn: 122938
 2011-01-06 01:21:53 +00:00