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Add two new methods which can be used to enable a bunch of transformations

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in common cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12407 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-03-15 01:58:54 +00:00
parent 15d443b566
commit 3e295b1b59
1 changed files with 22 additions and 0 deletions
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22
include/llvm/Analysis/AliasAnalysis.h
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@ -100,6 +100,28 @@ public:
///
virtual bool pointsToConstantMemory(const Value *P) { return false; }
/// doesNotAccessMemory - If the specified function is known to never read or
/// write memory, return true.
///
/// Many optimizations (such as CSE and LICM) can be performed on calls to it,
/// without worrying about aliasing properties, and many functions have this
/// property (e.g. 'sin' and 'cos').
///
/// This property corresponds to the GCC 'const' attribute.
///
virtual bool doesNotAccessMemory(Function *F) { return false; }
/// onlyReadsMemory - If the specified function is known to only read from
/// non-volatile memory (or not access memory at all), return true.
///
/// This property allows many common optimizations to be performed in the
/// absence of interfering store instructions, such as CSE of strlen calls.
///
/// This property corresponds to the GCC 'pure' attribute.
///
virtual bool onlyReadsMemory(Function *F) { return doesNotAccessMemory(F); }
//===--------------------------------------------------------------------===//
/// Simple mod/ref information...
///