[PATCH] Use linker sections to explicitly order functions for -fprofile-reorder-functions and -fipa-reorder-for-locality

[Prachi Godbole]

This patch adds support to linker driven function reordering by creating 
function sections with a prefix '.text.sorted' which are then sorted using SORT 
in by the linker. Appropriate support for this is already present in binutils.

Bootstrapped and regtested on aarch64-linux-gnu. Ok for mainline?

Thanks,
Prachi

Signed-off-by: Prachi Godbole pgodb...@nvidia.com

gcc/ChangeLog:

        * cgraph.cc (cgraph_node::dump): Dump value of text_locality_order.
        * cgraph.h (struct cgraph_node): New variable text_locality_order.
        * cgraphclones.cc (cgraph_node::create_clone): Initialize
        text_locality_order.
        * cgraphunit.cc (expand_all_functions): Update text_locality_order.
        * ipa-locality-cloning.cc (get_default_locality_order): New function.
        (add_node_to_partition): Update text_locality_order.
        * lto-cgraph.cc (lto_output_node): Write text_locality_order to file.
        (input_node): Read text_locality_order.
        * varasm.cc (default_function_section): Create function sections based
        on text_locality_order.

0001-PATCH-Use-linker-sections-to-explicitly-order-functi.patch
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