Move Instruction::isSafeToSpeculativelyExecute out of VMCore and
into Analysis as a standalone function, since there's no need for
it to be in VMCore. Also, update it to use isKnownNonZero and
other goodies available in Analysis, making it more precise,
enabling more aggressive optimization.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146610 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
index b8c3ab4..bf2cb49 100644
--- a/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -257,7 +257,7 @@
// Okay, it looks like the instruction IS in the "condition". Check to
// see if it's a cheap instruction to unconditionally compute, and if it
// only uses stuff defined outside of the condition. If so, hoist it out.
- if (!I->isSafeToSpeculativelyExecute())
+ if (!isSafeToSpeculativelyExecute(I))
return false;
unsigned Cost = 0;
@@ -1487,7 +1487,7 @@
Instruction *BonusInst = 0;
if (&*FrontIt != Cond &&
FrontIt->hasOneUse() && *FrontIt->use_begin() == Cond &&
- FrontIt->isSafeToSpeculativelyExecute()) {
+ isSafeToSpeculativelyExecute(FrontIt)) {
BonusInst = &*FrontIt;
++FrontIt;