https://sourceware.org/bugzilla/show_bug.cgi?id=26406
Bug ID: 26406
Summary: Extreme assembling time regression with 2.35 and
master
Product: binutils
Version: 2.35
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: franz.sirl at lauterbach dot com
Target Milestone: ---
Hi,
I just stumbled over an extreme slowdown in assembler performance. On a 265
MByte .s file (gcc10 assembly output of a 27000 line C source compiled with -O2
-fno-inline + debug + ASAN + UBSAN) the assembler of 2.34 takes ~49-59sec, but
the 2.35 assembler takes ~65-74min. Both use about 3.6 GBytes of memory. That's
quite a performance regression.
fsirl@ds1:~> time as-2.35 --64 -o sample.o sample.s
real 74m11.921s
user 73m45.203s
sys 0m13.132s
fsirl@ds1:~> time as-2.34 --64 -o sample.o sample.s
real 0m49.454s
user 0m46.331s
sys 0m2.623s
Most of the time seems to be spent in _bfd_elf_write_secondary_reloc_section().
The slowdown started with this commit:
commit a8e14f4cc2badfcf959f5e2cc57a941dc43f72d4
Author: Nick Clifton <[email protected]>
Date: Thu Mar 5 15:47:15 2020 +0000
Add support for ELF files which contain multiple reloc sections which all
target the same section.
Unfortunately I cannot share the testcase, but I can do any requested
debugging/testing.
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