This patch adds a magic OSC (operand store compare) break instruction
which is necessary if a store is followed closely by a load with same
base+indx+displ while either base or index get modified in between.
The patch improves several SpecCPU testcases running on IBM z13.
gcc/testsuite/ChangeLog:
2016-10-28 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* gcc.target/s390/oscbreak-1.c: New test.
gcc/ChangeLog:
2016-10-28 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* config/s390/s390.c (s390_adjust_loop_scan_osc): New function.
(s390_adjust_loops): New function.
(s390_reorg): Invoke s390_adjust_loops.
* config/s390/s390.md: (UNSPEC_OSC_BREAK): New constant.
("osc_break"): New insn definition.
From-SVN: r241644
