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Replace isTrapping with a new, similar method called

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isSafeToSpeculativelyExecute. The new method is a bit closer to what 
the callers actually care about in that it rejects more things callers 
don't want.  It also adds more precise handling for integer 
division, and unifies code for analyzing the legality of a speculative 
load.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76150 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2009-07-17 04:28:42 +00:00
parent 6055a6adb7
commit 0b79a7727d
6 changed files with 74 additions and 56 deletions
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9
lib/Analysis/LoopInfo.cpp
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@ -79,14 +79,9 @@ bool Loop::makeLoopInvariant(Instruction *I, bool &Changed,
// Test if the value is already loop-invariant.
if (isLoopInvariant(I))
return true;
// Don't hoist instructions with side-effects.
if (I->isTrapping())
if (!I->isSafeToSpeculativelyExecute())
return false;
// Don't hoist PHI nodes.
if (isa<PHINode>(I))
return false;
// Don't hoist allocation instructions.
if (isa<AllocationInst>(I))
if (I->mayReadFromMemory())
return false;
// Determine the insertion point, unless one was given.
if (!InsertPt) {