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authorAlan Modra <amodra@gmail.com>2017-09-09 21:55:22 +0930
committerAlan Modra <amodra@gmail.com>2017-09-10 01:55:16 +0930
commit2420fff633eff03ec1f85eba82a926cd0ecf4229 (patch)
treece52c69c7236e211580be3aa4da6692022bbe0bc /ld/emultempl
parentc5bce5c69721af8dae5c607e085e545cdba33ab1 (diff)
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PowerPC64 --plt-align
This changes the PowerPC64 --plt-align option to perform the usual alignment of code as suggested by its name, as well as the previous behaviour of padding so as to reduce boundary crossing. The old behaviour is had by using a negative parameter. The default is also changed to align plt stub code by default to 32 byte boundaries, the point being to get better bctr branch prediction on power8 and power9 hardware. bfd/ * elf64-ppp.c (plt_stub_pad): Handle positive and negative plt_stub_align. ld/ * ld.texinfo (--plt-align): Describe new behaviour of option. * emultempl/ppc64elf.em (params): Default plt_stub_align to 5. * testsuite/ld-powerpc/powerpc.exp: Pass --no-plt-align for selected tests. * testsuite/ld-powerpc/relbrlt.d: Pass --no-plt-align. * testsuite/ld-powerpc/elfv2so.d: Adjust expected output.
Diffstat (limited to 'ld/emultempl')
-rw-r--r--ld/emultempl/ppc64elf.em2
1 files changed, 1 insertions, 1 deletions
diff --git a/ld/emultempl/ppc64elf.em b/ld/emultempl/ppc64elf.em
index 58cb798..cf75957 100644
--- a/ld/emultempl/ppc64elf.em
+++ b/ld/emultempl/ppc64elf.em
@@ -37,7 +37,7 @@ static struct ppc64_elf_params params = { NULL,
&ppc_add_stub_section,
&ppc_layout_sections_again,
1, -1, 0,
- ${DEFAULT_PLT_STATIC_CHAIN-0}, -1, 0,
+ ${DEFAULT_PLT_STATIC_CHAIN-0}, -1, 5,
-1, 0, -1, -1, 0};
/* Fake input file for stubs. */