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[GCC ARM-Embedded-4_7]Back port r193425(improving reger pressure hoisting) from TRUNK
- From: "Bin Cheng" <bin dot cheng at arm dot com>
- To: <gcc-patches at gcc dot gnu dot org>
- Cc: "Joey Ye" <Joey dot Ye at arm dot com>
- Date: Wed, 14 Nov 2012 16:19:58 +0800
- Subject: [GCC ARM-Embedded-4_7]Back port r193425(improving reger pressure hoisting) from TRUNK
Hi,
I back ported r193425 from TRUNK to GCC ARM-Embedded-4_7 branch as r193495.
Thanks
Backport from mainline r193425
2012-11-12 Bin Cheng <bin.cheng@arm.com>
* gcse.c (struct bb_data): Add new fields, old_pressure, live_in
and backup.
(get_regno_pressure_class): Add prototype.
(update_bb_reg_pressure): New.
(should_hoist_expr_to_dom): Add new parameter from.
Monitor the change of reg pressure and use it to drive hoisting.
(hoist_code): Update LIVE and reg pressure information.
(calculate_bb_reg_pressure): Initialize live_in and backup.
Backport from mainline r193425
2012-11-12 Bin Cheng <bin.cheng@arm.com>
* gcc.dg/hoist-register-pressure-3.c: New test.