[PATCH GCC][1/6]Compute type mode and register pressure class mapping

[Bin Cheng <Bin dot Cheng at arm dot com>]

Hi,
This will be a patch series implementing an interface which estimates register
pressure on tree ssa and uses the information in predictive common optimization.
This the first patch computing map from type modes to register pressure classes.

Given there is no pseudo register on tree ssa form, we need type mode -> register
class information to compute register pressure.  This patch adds such map in
struct target_ira and a function computing the map.  Though the map is computed
by guess, it's enough for use on tree level.  As a matter of fact, we only need
to identify GENERAL, FLOAT and VECTOR register classes.

Bootstrap and test on x86_64 and AArch64, is it OK?

Thanks,
bin

2017-05-10  Bin Cheng  <bin.cheng@arm.com>

	* ira.c (setup_mode_classes): New function.
	(find_reg_classes): Call above function.
	* ira.h (struct target_ira): New field x_ira_mode_classes.
	(ira_mode_classes): New macro.

Attachment: 0001-ira-mode-reg_class-map-20170316.txt
Description: 0001-ira-mode-reg_class-map-20170316.txt