Revert r44626, which turned off the use of readonly

and readnone for functions with bodies because it
broke llvm-gcc-4.2 bootstrap.  It turns out that,
because of LLVM's array_ref hack, gcc was computing
pure/const attributes wrong (now fixed by turning
off the gcc ipa-pure-const pass).

llvm-svn: 44937

2 files changed, 4 insertions, 15 deletions

diff --git a/llvm/lib/Analysis/AliasAnalysis.cpp b/llvm/lib/Analysis/AliasAnalysis.cpp
index fe3f41a9ce8..12ea937fa92 100644
--- a/llvm/lib/Analysis/AliasAnalysis.cpp
+++ b/llvm/lib/Analysis/AliasAnalysis.cpp
@@ -116,17 +116,13 @@ AliasAnalysis::getModRefInfo(StoreInst *S, Value *P, unsigned Size) {
 AliasAnalysis::ModRefBehavior
 AliasAnalysis::getModRefBehavior(CallSite CS,
                                  std::vector<PointerAccessInfo> *Info) {
-  if (CS.doesNotAccessMemory() &&
-      // FIXME: workaround gcc bootstrap breakage
-      CS.getCalledFunction() && CS.getCalledFunction()->isDeclaration())
+  if (CS.doesNotAccessMemory())
     // Can't do better than this.
     return DoesNotAccessMemory;
   ModRefBehavior MRB = UnknownModRefBehavior;
   if (Function *F = CS.getCalledFunction())
     MRB = getModRefBehavior(F, CS, Info);
-  if (MRB != DoesNotAccessMemory && CS.onlyReadsMemory() &&
-      // FIXME: workaround gcc bootstrap breakage
-      CS.getCalledFunction() && CS.getCalledFunction()->isDeclaration())
+  if (MRB != DoesNotAccessMemory && CS.onlyReadsMemory())
     return OnlyReadsMemory;
   return MRB;
 }
@@ -134,15 +130,11 @@ AliasAnalysis::getModRefBehavior(CallSite CS,
 AliasAnalysis::ModRefBehavior
 AliasAnalysis::getModRefBehavior(Function *F,
                                  std::vector<PointerAccessInfo> *Info) {
-  if (F->doesNotAccessMemory() &&
-      // FIXME: workaround gcc bootstrap breakage
-      F->isDeclaration())
+  if (F->doesNotAccessMemory())
     // Can't do better than this.
     return DoesNotAccessMemory;
   ModRefBehavior MRB = getModRefBehavior(F, CallSite(), Info);
-  if (MRB != DoesNotAccessMemory && F->onlyReadsMemory() &&
-      // FIXME: workaround gcc bootstrap breakage
-      F->isDeclaration())
+  if (MRB != DoesNotAccessMemory && F->onlyReadsMemory())
     return OnlyReadsMemory;
   return MRB;
 }
diff --git a/llvm/lib/VMCore/Instruction.cpp b/llvm/lib/VMCore/Instruction.cpp
index 7fc6245f6da..9b208854ba1 100644
--- a/llvm/lib/VMCore/Instruction.cpp
+++ b/llvm/lib/VMCore/Instruction.cpp
@@ -13,7 +13,6 @@
 
 #include "llvm/Type.h"
 #include "llvm/Instructions.h"
-#include "llvm/IntrinsicInst.h" // FIXME: remove
 #include "llvm/Function.h"
 #include "llvm/Support/CallSite.h"
 #include "llvm/Support/LeakDetector.h"
@@ -209,8 +208,6 @@ bool Instruction::mayWriteToMemory() const {
   case Instruction::VAArg:
     return true;
   case Instruction::Call:
-    if (!isa<IntrinsicInst>(this))
-      return true; // FIXME: workaround gcc bootstrap breakage
     return !cast<CallInst>(this)->onlyReadsMemory();
   case Instruction::Load:
     return cast<LoadInst>(this)->isVolatile();