SmallPtrSetImpl<Function *> *Readers = nullptr,
SmallPtrSetImpl<Function *> *Writers = nullptr,
GlobalValue *OkayStoreDest = nullptr);
- bool AnalyzeIndirectGlobalMemory(GlobalValue *GV);
+ bool AnalyzeIndirectGlobalMemory(GlobalVariable *GV);
void CollectSCCMembership(CallGraph &CG);
bool isNonEscapingGlobalNoAlias(const GlobalValue *GV, const Value *V);
/// Further, all loads out of GV must directly use the memory, not store the
/// pointer somewhere. If this is true, we consider the memory pointed to by
/// GV to be owned by GV and can disambiguate other pointers from it.
-bool GlobalsAAResult::AnalyzeIndirectGlobalMemory(GlobalValue *GV) {
+bool GlobalsAAResult::AnalyzeIndirectGlobalMemory(GlobalVariable *GV) {
// Keep track of values related to the allocation of the memory, f.e. the
// value produced by the malloc call and any casts.
std::vector<Value *> AllocRelatedValues;
+ // If the initializer is a valid pointer, bail.
+ if (Constant *C = GV->getInitializer())
+ if (!C->isNullValue())
+ return false;
+
// Walk the user list of the global. If we find anything other than a direct
// load or store, bail out.
for (User *U : GV->users()) {
--- /dev/null
+; RUN: opt -globals-aa -gvn < %s -S | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; @o and @m are initialized to @i, so they should not be classed as
+; indirect globals referring only to allocation functions.
+@o = internal global i32* @i, align 8
+@m = internal global i32* @i, align 8
+@i = internal global i32 0, align 4
+
+; CHECK-LABEL: @f
+define i1 @f() {
+entry:
+ %0 = load i32*, i32** @o, align 8
+ store i32 0, i32* %0, align 4
+ %1 = load volatile i32*, i32** @m, align 8
+ store i32 1, i32* %1, align 4
+ ; CHECK: %[[a:.*]] = load i32*
+ %2 = load i32*, i32** @o, align 8
+ ; CHECK: %[[b:.*]] = load i32, i32* %[[a]]
+ %3 = load i32, i32* %2, align 4
+ ; CHECK: %[[c:.*]] = icmp ne i32 %[[b]], 0
+ %tobool.i = icmp ne i32 %3, 0
+ ; CHECK: ret i1 %[[c]]
+ ret i1 %tobool.i
+}
\ No newline at end of file