https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88083
--- Comment #1 from iii at gcc dot gnu.org ---
Author: iii
Date: Tue Nov 20 09:32:49 2018
New Revision: 266306
URL: https://gcc.gnu.org/viewcvs?rev=266306=gcc=rev
Log:
S/390: Skip LT(G) peephole when literal pool is involved
By the time peephole optimizations run, we've already made up our mind
whether to use base-register or relative addressing for literal pool
entries. LT(G) supports only base-register addressing, and so it is
too late to convert L(G)RL + compare to LT(G). This change should not
make the code worse unless building with e.g. -fno-dce, since comparing
literal pool entries to zero should be optimized away during earlier
passes.
gcc/ChangeLog:
2018-11-20 Ilya Leoshkevich
PR target/88083
* config/s390/s390.md: Skip LT(G) peephole when literal pool is
involved.
* rtl.h (contains_constant_pool_address_p): New function.
* rtlanal.c (contains_constant_pool_address_p): Likewise.
gcc/testsuite/ChangeLog:
2018-11-20 Ilya Leoshkevich
PR target/88083
* gcc.target/s390/pr88083.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/s390/pr88083.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/s390/s390.md
trunk/gcc/rtl.h
trunk/gcc/rtlanal.c
trunk/gcc/testsuite/ChangeLog
