r211759 - in /branches/google/gcc-4_8/gcc: conf...

[wmi at gcc dot gnu dot org]

Author: wmi
Date: Tue Jun 17 23:45:14 2014
New Revision: 211759

URL: https://gcc.gnu.org/viewcvs?rev=211759&root=gcc&view=rev
Log:
1. Solve the code size problem1 of fp shrinkwrapping -- use fp as cfa_reg
when no fp is defined in func body before frame pointer shrinkwrapping.
2. Solve the code size problem2 of fp shrinkwrapping -- promote fp setting
insns more aggresively.

2014-06-17  Wei Mi  <wmi@google.com>

	* gcc/config/i386/i386.c (ix86_expand_prologue): Use fp as cfa_reg
	when possible to reduce .eh_frame size.
	(ix86_expand_epilogue): Relax the check to allow m->fs.fp_valid
	in certain case when frame_pointer_partially_needed is true.
	* gcc/function.c (bb_fpset_local_init): Set any_fp_def.
	(evaluate_promote_fpset_to_bb): Use promote_fraction to control
	promotion aggressiveness.
	* gcc/function.h (struct rtl_data): Add any_fp_def.
	* gcc/params.def (PARAM_FPSET_PROMOTE_FRACTION):
	Change lower bound value to 0.


Modified:
    branches/google/gcc-4_8/gcc/config/i386/i386.c
    branches/google/gcc-4_8/gcc/function.c
    branches/google/gcc-4_8/gcc/function.h
    branches/google/gcc-4_8/gcc/params.def