[Analysis] Support aligned new/delete functions.

Summary:
Clang's __builtin_operator_new/delete was recently taught about the aligned allocation overloads (r328134). This patch makes LLVM aware of them as well.
This allows the compiler to perform certain optimizations including eliding new/delete calls.

Reviewers: rsmith, majnemer, dblaikie, vsk, bkramer

Reviewed By: bkramer

Subscribers: ckennelly, llvm-commits

Differential Revision: https://reviews.llvm.org/D44769

llvm-svn: 329218

1 files changed, 28 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/TargetLibraryInfo.cpp b/llvm/lib/Analysis/TargetLibraryInfo.cpp
index c605c91c11c..ff6aae8b5ec 100644
--- a/llvm/lib/Analysis/TargetLibraryInfo.cpp
+++ b/llvm/lib/Analysis/TargetLibraryInfo.cpp
@@ -992,8 +992,26 @@ bool TargetLibraryInfoImpl::isValidProtoForLibFunc(const FunctionType &FTy,
   case LibFunc_msvc_new_array_int_nothrow:
   // new[](unsigned long long, nothrow);
   case LibFunc_msvc_new_array_longlong_nothrow:
+  // new(unsigned int, align_val_t)
+  case LibFunc_ZnwjSt11align_val_t:
+  // new(unsigned long, align_val_t)
+  case LibFunc_ZnwmSt11align_val_t:
+  // new[](unsigned int, align_val_t)
+  case LibFunc_ZnajSt11align_val_t:
+  // new[](unsigned long, align_val_t)
+  case LibFunc_ZnamSt11align_val_t:
     return (NumParams == 2 && FTy.getReturnType()->isPointerTy());
 
+  // new(unsigned int, align_val_t, nothrow)
+  case LibFunc_ZnwjSt11align_val_tRKSt9nothrow_t:
+  // new(unsigned long, align_val_t, nothrow)
+  case LibFunc_ZnwmSt11align_val_tRKSt9nothrow_t:
+  // new[](unsigned int, align_val_t, nothrow)
+  case LibFunc_ZnajSt11align_val_tRKSt9nothrow_t:
+  // new[](unsigned long, align_val_t, nothrow)
+  case LibFunc_ZnamSt11align_val_tRKSt9nothrow_t:
+    return (NumParams == 3 && FTy.getReturnType()->isPointerTy());
+
   // void operator delete[](void*);
   case LibFunc_ZdaPv:
   // void operator delete(void*);
@@ -1020,6 +1038,10 @@ bool TargetLibraryInfoImpl::isValidProtoForLibFunc(const FunctionType &FTy,
   case LibFunc_ZdlPvj:
   // void operator delete(void*, unsigned long);
   case LibFunc_ZdlPvm:
+  // void operator delete(void*, align_val_t)
+  case LibFunc_ZdlPvSt11align_val_t:
+  // void operator delete[](void*, align_val_t)
+  case LibFunc_ZdaPvSt11align_val_t:
   // void operator delete[](void*, unsigned int);
   case LibFunc_msvc_delete_array_ptr32_int:
   // void operator delete[](void*, nothrow);
@@ -1038,6 +1060,12 @@ bool TargetLibraryInfoImpl::isValidProtoForLibFunc(const FunctionType &FTy,
   case LibFunc_msvc_delete_ptr64_nothrow:
     return (NumParams == 2 && FTy.getParamType(0)->isPointerTy());
 
+  // void operator delete(void*, align_val_t, nothrow)
+  case LibFunc_ZdlPvSt11align_val_tRKSt9nothrow_t:
+  // void operator delete[](void*, align_val_t, nothrow)
+  case LibFunc_ZdaPvSt11align_val_tRKSt9nothrow_t:
+    return (NumParams == 3 && FTy.getParamType(0)->isPointerTy());
+
   case LibFunc_memset_pattern16:
     return (!FTy.isVarArg() && NumParams == 3 &&
             FTy.getParamType(0)->isPointerTy() &&