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

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202432 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2014-02-27 21:37:30 +00:00
parent d76403be1d
commit 594e2aa61e
1 changed files with 2 additions and 2 deletions
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4
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 /// Allow the target to reverse allocation order of local live ranges. This
/// will generally allocate shorter local live ranges first. For targets with /// will generally allocate shorter local live ranges first. For targets with
/// many registers, this could reduce regalloc compile time by a large /// many registers, this could reduce regalloc compile time by a large
/// factor. It should still achieve optimal coloring; however, it can change /// factor. It is disabled by default for three reasons:
/// register eviction decisions. It is disabled by default for two reasons:
/// (1) Top-down allocation is simpler and easier to debug for targets that /// (1) Top-down allocation is simpler and easier to debug for targets that
/// don't benefit from reversing the order. /// don't benefit from reversing the order.
/// (2) Bottom-up allocation could result in poor evicition decisions on some /// (2) Bottom-up allocation could result in poor evicition decisions on some
/// targets affecting the performance of compiled code. /// targets affecting the performance of compiled code.
/// (3) Bottom-up allocation is no longer guaranteed to optimally color.
virtual bool reverseLocalAssignment() const { return false; } virtual bool reverseLocalAssignment() const { return false; }
/// requiresRegisterScavenging - returns true if the target requires (and can /// requiresRegisterScavenging - returns true if the target requires (and can