On 10/18/2016 01:47 PM, Pat Haugen wrote:
The patch here, https://gcc.gnu.org/ml/gcc-patches/2014-10/msg01872.html, attempted to scale down the register limit used by -fsched-pressure for the case where the block in question executes as frequently as the entry block to just the call_clobbered (i.e. call_used) regs. But the code is actually scaling toward call_saved registers. The following patch corrects the following two issues:1) Computes and then removes the FIXED_REGS for the pressure class. 2) Computes CALL_SAVED regs per class and subtracts out some scaled portion of that. Bootstrap/regtest on powerpc64le in progress. Ok for trunk if no new failures? -Pat 2016-10-18 Pat Haugen <pthau...@us.ibm.com> * haifa-sched.c (call_used_regs_num): Rename to... (call_saved_regs_num): ...this. (fixed_regs_num): New variable. (sched_pressure_start_bb): Subtract out fixed_regs. Scale call_saved regs not call_used. (alloc_global_sched_pressure_data): Compute call_saved and fixed regs.
OK. jeff
