The loads and stores handled in the second instruction of a sequence
marked by R_PPC64_PCREL_OPT may be a prefix instruction. For example:
pld ra,symbol@got@pcrel
0:
pld rt,off(ra)
.reloc 0b-8,R_PPC64_PCREL_OPT,(.-8)-(0b-8)
can be optimised to
pld rt,symbol+off@pcrel
pnop
* elf64-ppc.c (xlate_pcrel_opt): Handle prefix loads and stores
in second instruction.
(ppc64_elf_relocate_section): Likewise.
bfd/
* elf64-ppc.c (ppc64_elf_check_relocs): Set has_gotrel for
R_PPC64_GOT_PCREL34.
(xlate_pcrel_opt): New function.
(ppc64_elf_edit_toc): Handle R_PPC64_GOT_PCREL34.
(ppc64_elf_relocate_section): Edit GOT indirect to GOT relative
for R_PPC64_GOT_PCREL34. Implement R_PPC64_PCREL_OPT optimisation.
ld/
* testsuite/ld-powerpc/pcrelopt.s,
* testsuite/ld-powerpc/pcrelopt.d,
* testsuite/ld-powerpc/pcrelopt.sec: New test.
* testsuite/ld-powerpc/powerpc.exp: Run it.