6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-19 02:25:01 +00:00
Code Issues Projects Releases Wiki Activity

Integrate the readonly/readnone logic more deeply

Browse Source 
into alias analysis.  This meant updating the API
which now has versions of the getModRefBehavior,
doesNotAccessMemory and onlyReadsMemory methods
which take a callsite parameter.  These should be
used unless the callsite is not known, since in
general they can do a better job than the versions
that take a function.  Also, users should no longer
call the version of getModRefBehavior that takes
both a function and a callsite.  To reduce the
chance of misuse it is now protected.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44487 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2007-12-01 07:51:45 +00:00
parent e3110d0825
commit dff6710717
12 changed files with 122 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
lib/Analysis/LoadValueNumbering.cpp
View File

@@ -148,7 +148,7 @@ void LoadVN::getCallEqualNumberNodes(CallInst *CI,
Function *CF = CI->getCalledFunction();
if (CF == 0) return; // Indirect call.
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
AliasAnalysis::ModRefBehavior MRB = AA.getModRefBehavior(CF, CI);
AliasAnalysis::ModRefBehavior MRB = AA.getModRefBehavior(CI);
if (MRB != AliasAnalysis::DoesNotAccessMemory &&
MRB != AliasAnalysis::OnlyReadsMemory)
return; // Nothing we can do for now.
@@ -227,8 +227,7 @@ void LoadVN::getCallEqualNumberNodes(CallInst *CI,
CantEqual = true;
break;
} else if (CallInst *CI = dyn_cast<CallInst>(I)) {
if (CI->getCalledFunction() == 0 ||
!AA.onlyReadsMemory(CI->getCalledFunction())) {
if (!AA.onlyReadsMemory(CI)) {
CantEqual = true;
break;
}