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From: "juzhe.zhong at rivai dot ai" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/113495] New: RISC-V: Time and memory awful consumption of
 SPEC2017 wrf benchmark
Date: Fri, 19 Jan 2024 01:22:45 +0000
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X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113495

            Bug ID: 113495
           Summary: RISC-V: Time and memory awful consumption of SPEC2017
                    wrf benchmark
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: juzhe.zhong at rivai dot ai
  Target Milestone: ---

riscv64-unknown-linux-gnu-gfortran -march=3Drv64gcv_zvl256b -O3 -S -ftime-r=
eport

real    63m18.771s
user    60m19.036s
sys     2m59.787s

60+ minutes.

After investigation, the time report show 2 PASS are critical:

loop invariant motion              :2600.28 ( 72%)   1.68 (  1%)2602.12 ( 6=
9%)=20
2617k (  0%)

loop invariant consume most of the time 72% time.

The other is the VSETVL PASS:

vsetvl: earliest_fuse_vsetvl_info  : 438.26 ( 12%)  79.82 ( 47%) 518.08 (
14%)221807M ( 75%)
 vsetvl: pre_global_vsetvl_info     : 135.98 (  4%)  31.71 ( 19%) 167.69 ( =
 4%)
71950M ( 24%)

The phase 2 and phase 3 of VSETVL PASS consume 16% times and 99% memory.

I will look into VSETVL PASS issue but I am not able to take care of loop
invariant issue.=