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MemDerefPrinter: Require DataLayoutPass for higher accuracy

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Without a valid data layout, deferenceable(N) doesn't get parsed or
propagated. Since this is the key item we are testing, add a dependency
on the pass.

Differential Revision: http://reviews.llvm.org/D7508

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228611 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ramkumar Ramachandra 2015-02-09 21:50:03 +00:00
parent c016fa420f
commit c904d5075f
2 changed files with 15 additions and 4 deletions
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15
lib/Analysis/MemDerefPrinter.cpp
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@ -11,6 +11,7 @@
#include "llvm/ADT/SetVector.h"
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Support/ErrorHandling.h"
@ -25,6 +26,10 @@ namespace {
MemDerefPrinter() : FunctionPass(ID) {
initializeMemDerefPrinterPass(*PassRegistry::getPassRegistry());
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<DataLayoutPass>();
AU.setPreservesAll();
}
bool runOnFunction(Function &F) override;
void print(raw_ostream &OS, const Module * = nullptr) const override;
void releaseMemory() override {
@ -34,18 +39,22 @@ namespace {
}
char MemDerefPrinter::ID = 0;
INITIALIZE_PASS(MemDerefPrinter, "print-memderefs",
"Memory Dereferenciblity of pointers in function", false, true)
INITIALIZE_PASS_BEGIN(MemDerefPrinter, "print-memderefs",
"Memory Dereferenciblity of pointers in function", false, true)
INITIALIZE_PASS_DEPENDENCY(DataLayoutPass)
INITIALIZE_PASS_END(MemDerefPrinter, "print-memderefs",
"Memory Dereferenciblity of pointers in function", false, true)
FunctionPass *llvm::createMemDerefPrinter() {
return new MemDerefPrinter();
}
bool MemDerefPrinter::runOnFunction(Function &F) {
const DataLayout *DL = &getAnalysis<DataLayoutPass>().getDataLayout();
for (auto &I: inst_range(F)) {
if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
Value *PO = LI->getPointerOperand();
if (PO->isDereferenceablePointer(nullptr))
if (PO->isDereferenceablePointer(DL))
Vec.push_back(PO);
}
}

4
test/Analysis/ValueTracking/memory-dereferenceable.ll
View File

@ -3,11 +3,13 @@
; Uses the print-deref (+ analyze to print) pass to run
; isDereferenceablePointer() on many load instruction operands
target datalayout = "e"
declare zeroext i1 @return_i1()
@globalstr = global [6 x i8] c"hello\00"
define void @test(i32 addrspace(1)* byval %dparam) {
define void @test(i32 addrspace(1)* dereferenceable(8) %dparam) {
; CHECK: The following are dereferenceable:
; CHECK: %globalptr
; CHECK: %alloca