gallivm: add helper lp_add_attr_dereferenceable

Not sure if this is the right way to do it, but it seems to work.

v2: make it a no-op on LLVM <= 3.5

Reviewed-by: Roland Scheidegger <[email protected]>
Reviewed-by: Nicolai Hähnle <[email protected]>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
index 23ef3edeae7..791a4702556 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
+++ b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
@@ -697,3 +697,14 @@ lp_free_memory_manager(LLVMMCJITMemoryManagerRef memorymgr)
 {
    delete reinterpret_cast<BaseMemoryManager*>(memorymgr);
 }
+
+extern "C" void
+lp_add_attr_dereferenceable(LLVMValueRef val, uint64_t bytes)
+{
+#if HAVE_LLVM >= 0x0306
+   llvm::Argument *A = llvm::unwrap<llvm::Argument>(val);
+   llvm::AttrBuilder B;
+   B.addDereferenceableAttr(bytes);
+   A->addAttr(llvm::AttributeSet::get(A->getContext(), A->getArgNo() + 1,  B));
+#endif
+}