https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69625
--- Comment #5 from Andreas Krebbel <krebbel at gcc dot gnu.org> --- Author: krebbel Date: Thu Feb 25 10:04:30 2016 New Revision: 233697 URL: https://gcc.gnu.org/viewcvs?rev=233697&root=gcc&view=rev Log: S/390: Fix r6 vararg handling. This patch fixes a problem introduced with the GPR into FPR slot save feature for leaf functions. r6 is argument register as well as call-saved. Currently we might decide that it will be a candidate for being saved into an FPR. If it turns out later that r6 also needs to be saved due to being required for vararg we undo the FPR save decision and put it on the stack again. Unfortunately the code did not adjust the GPR restore range accordingly so that the register does not get restored in the load multiple. This fixes the following testcases on s390x: < FAIL: libgomp.c/doacross-1.c execution test < FAIL: libgomp.c/doacross-2.c execution test < FAIL: libgomp.c/doacross-3.c execution test < FAIL: libgomp.c++/doacross-1.C execution test gcc/ChangeLog: 2016-02-25 Andreas Krebbel <kreb...@linux.vnet.ibm.com> Backport from mainline 2016-02-05 Andreas Krebbel <kreb...@linux.vnet.ibm.com> PR target/69625 * config/s390/s390.c (SAVE_SLOT_NONE, SAVE_SLOT_STACK): New defines. (s390_register_info_gprtofpr): Use new macros above. (s390_register_info_stdarg_fpr): Adjust max_fpr to better match its name. (s390_register_info_stdarg_gpr): Adjust max_gpr to better match its name. Adjust restore and save gpr ranges. (s390_register_info_set_ranges): New function. (s390_register_info): Use new macros above. Call s390_register_info_set_ranges. (s390_optimize_register_info): Likewise. (s390_hard_regno_rename_ok): Use new macros. (s390_hard_regno_scratch_ok): Likewise. (s390_emit_epilogue): Likewise. (s390_can_use_return_insn): Likewise. (s390_optimize_prologue): Likewise. * config/s390/s390.md (GPR2_REGNUM, GPR6_REGNUM): New constants. Modified: branches/gcc-5-branch/gcc/ChangeLog branches/gcc-5-branch/gcc/config/s390/s390.c branches/gcc-5-branch/gcc/config/s390/s390.md
