diff options
Diffstat (limited to 'lib/Transforms/IPO')
| -rw-r--r-- | lib/Transforms/IPO/FunctionAttrs.cpp | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/lib/Transforms/IPO/FunctionAttrs.cpp b/lib/Transforms/IPO/FunctionAttrs.cpp index fed8839e6f..8174df9ec0 100644 --- a/lib/Transforms/IPO/FunctionAttrs.cpp +++ b/lib/Transforms/IPO/FunctionAttrs.cpp @@ -449,14 +449,29 @@ determinePointerReadAttrs(Argument *A, case Instruction::Call: case Instruction::Invoke: { + bool Captures = true; + + if (I->getType()->isVoidTy()) + Captures = false; + + auto AddUsersToWorklistIfCapturing = [&] { + if (Captures) + for (Use &UU : I->uses()) + if (Visited.insert(&UU)) + Worklist.push_back(&UU); + }; + CallSite CS(I); - if (CS.doesNotAccessMemory()) + if (CS.doesNotAccessMemory()) { + AddUsersToWorklistIfCapturing(); continue; + } Function *F = CS.getCalledFunction(); if (!F) { if (CS.onlyReadsMemory()) { IsRead = true; + AddUsersToWorklistIfCapturing(); continue; } return Attribute::None; @@ -471,6 +486,7 @@ determinePointerReadAttrs(Argument *A, "More params than args in non-varargs call."); return Attribute::None; } + Captures &= !CS.doesNotCapture(A - B); if (SCCNodes.count(AI)) continue; if (!CS.onlyReadsMemory() && !CS.onlyReadsMemory(A - B)) @@ -479,6 +495,7 @@ determinePointerReadAttrs(Argument *A, IsRead = true; } } + AddUsersToWorklistIfCapturing(); break; } |