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Drive-by comment fix. This regalloc comment was not accurate. 

llvm-svn: 202432
This commit is contained in:
Andrew Trick 2014-02-27 21:37:30 +00:00
parent 46822c7c72
commit aa895884b2
1 changed files with 2 additions and 2 deletions
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4
llvm/include/llvm/Target/TargetRegisterInfo.h
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@ -675,12 +675,12 @@ public:
/// Allow the target to reverse allocation order of local live ranges. This
/// will generally allocate shorter local live ranges first. For targets with
/// many registers, this could reduce regalloc compile time by a large
/// factor. It should still achieve optimal coloring; however, it can change
/// register eviction decisions. It is disabled by default for two reasons:
/// factor. It is disabled by default for three reasons:
/// (1) Top-down allocation is simpler and easier to debug for targets that
/// don't benefit from reversing the order.
/// (2) Bottom-up allocation could result in poor evicition decisions on some
/// targets affecting the performance of compiled code.
/// (3) Bottom-up allocation is no longer guaranteed to optimally color.
virtual bool reverseLocalAssignment() const { return false; }
/// requiresRegisterScavenging - returns true if the target requires (and can