[Bug target/89865] [9 Regression] FAIL: gcc.target/i386/pr49095.c scan-assembler-times \\\\), % 45

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89865

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bergner at gcc dot gnu.org,
                   |                            |vmakarov at gcc dot gnu.org

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Actually, there are only very few revisions since 8.x that change something on
this testcase with -Os -fno-shrink-wrap -masm=att
-fno-asynchronous-unwind-tables (the latter to be able to more accurately
compare *.s sizes).  GCC 8.3 emits code pretty similar to trunk immediately
before r264897, just scheduling decisions reorder some instructions, nothing
else.
ls -l pr49095.s{.8*,r2*}
-rw-rw-r--. 1 jakub jakub 16364 Mar 28 12:58 pr49095.s.8.3.1
-rw-rw-r--. 1 jakub jakub 16361 Mar 28 12:50 pr49095.s.r264892
-rw-rw-r--. 1 jakub jakub 17545 Mar 28 12:50 pr49095.s.r264897
-rw-rw-r--. 1 jakub jakub 17545 Mar 28 12:51 pr49095.s.r265393
-rw-rw-r--. 1 jakub jakub 16361 Mar 28 12:51 pr49095.s.r265398
-rw-rw-r--. 1 jakub jakub 16361 Mar 28 12:55 pr49095.s.r266382
-rw-rw-r--. 1 jakub jakub 18989 Mar 28 12:55 pr49095.s.r266385
-rw-rw-r--. 1 jakub jakub 18989 Mar 28 12:55 pr49095.s.r269951
r264892 is identical to r265398 and r266382, r264897 to r265393, and r266385 to
r269951.  Judging by both assembly size and .text size:
size pr49095.o.*
   text    data     bss     dec     hex filename
   1585       0       0    1585     631 pr49095.o.8.3.1
   1585       0       0    1585     631 pr49095.o.r264892
   2066       0       0    2066     812 pr49095.o.r264897
   2066       0       0    2066     812 pr49095.o.r265393
   1585       0       0    1585     631 pr49095.o.r265398
   1585       0       0    1585     631 pr49095.o.r266382
   2545       0       0    2545     9f1 pr49095.o.r266385
   2545       0       0    2545     9f1 pr49095.o.r269951
(this is -Os, so that is what matters), r264897 made the generated code worse,
then r265398 reverted it to the previously generated code and r266385 made it
even worse.