https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117081
--- Comment #11 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by H.J. Lu <h...@gcc.gnu.org>: https://gcc.gnu.org/g:d3ff498c478acefce35de04402f99171b4f64a1a commit r15-7400-gd3ff498c478acefce35de04402f99171b4f64a1a Author: H.J. Lu <hjl.to...@gmail.com> Date: Sun Feb 2 07:10:55 2025 +0800 ira: Add a target hook for callee-saved register cost scale commit 3b9b8d6cfdf59337f4b7ce10ce92a98044b2657b Author: Surya Kumari Jangala <jskum...@linux.ibm.com> Date: Tue Jun 25 08:37:49 2024 -0500 ira: Scale save/restore costs of callee save registers with block frequency scales the cost of saving/restoring a callee-save hard register in epilogue and prologue with the entry block frequency, which, if not optimizing for size, is 10000, for all targets. As the result, callee-saved registers may not be used to preserve local variable values across calls on some targets, like x86. Add a target hook for the callee-saved register cost scale in epilogue and prologue used by IRA. The default version of this target hook returns 1 if optimizing for size, otherwise returns the entry block frequency. Add an x86 version of this target hook to restore the old behavior prior to the above commit. PR rtl-optimization/111673 PR rtl-optimization/115932 PR rtl-optimization/116028 PR rtl-optimization/117081 PR rtl-optimization/117082 PR rtl-optimization/118497 * ira-color.cc (assign_hard_reg): Call the target hook for the callee-saved register cost scale in epilogue and prologue. * target.def (ira_callee_saved_register_cost_scale): New target hook. * targhooks.cc (default_ira_callee_saved_register_cost_scale): New. * targhooks.h (default_ira_callee_saved_register_cost_scale): Likewise. * config/i386/i386.cc (ix86_ira_callee_saved_register_cost_scale): New. (TARGET_IRA_CALLEE_SAVED_REGISTER_COST_SCALE): Likewise. * doc/tm.texi: Regenerated. * doc/tm.texi.in (TARGET_IRA_CALLEE_SAVED_REGISTER_COST_SCALE): New. Signed-off-by: H.J. Lu <hjl.to...@gmail.com>
