ac/nir: set the noalias attribute on input pointers

This attribute is similar to the definition of restrict in
C99 and it might help LLVM.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 5b8c346d0053dfe8cfc685557480f19fd2ad508e..6833439cc12cf75b33419cb71b1d87175a31cdd0 100644 (file)
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -326,6 +326,7 @@ create_llvm_function(LLVMContextRef ctx, LLVMModuleRef module,
                if (args->array_params_mask & (1 << i)) {
                        LLVMValueRef P = LLVMGetParam(main_function, i);
                        ac_add_function_attr(ctx, main_function, i + 1, AC_FUNC_ATTR_BYVAL);
+                       ac_add_function_attr(ctx, main_function, i + 1, AC_FUNC_ATTR_NOALIAS);
                        ac_add_attr_dereferenceable(P, UINT64_MAX);
                }
                else {