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Added invariant field to the DAG.getLoad method and changed all calls.

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When this field is true it means that the load is from constant (runt-time or compile-time) and so can be hoisted from loops or moved around other memory accesses


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144100 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper
2011-11-08 18:42:53 +00:00
parent 30b4d8b83b
commit d752e0f7e6
26 changed files with 253 additions and 202 deletions
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1
lib/CodeGen/MachineInstr.cpp
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@ -1253,6 +1253,7 @@ bool MachineInstr::isInvariantLoad(AliasAnalysis *AA) const {
E = memoperands_end(); I != E; ++I) {
if ((*I)->isVolatile()) return false;
if ((*I)->isStore()) return false;
if ((*I)->isInvariant()) return true;
if (const Value *V = (*I)->getValue()) {
// A load from a constant PseudoSourceValue is invariant.