[Bug target/86952] Avoid jump table for switch statement with -mindirect-branch=thunk

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86952

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-11-23
     Ever confirmed|0                           |1

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
Please try retpoline-table branch at

https://github.com/hjl-tools/microbenchmark

I got

[hjl@gnu-cfl-1 microbenchmark]$ make
gcc -g -I. -O2 -mindirect-branch=thunk   -c -o test.o test.c
gcc -g -I. -O2 -mindirect-branch=thunk -fno-jump-tables   -c -o
switch-no-table.o switch-no-table.c
gcc -g -I. -O2 -mindirect-branch=thunk   -c -o switch.o switch.c
gcc -o test test.o switch-no-table.o switch.o
./test
no jump table: 189484
jump table   : 333016
[hjl@gnu-cfl-1 microbenchmark]$