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i386: Add -mbranches-within-32B-boundaries

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Add -mbranches-within-32B-boundaries to enable

-malign-branch-boundary=32
-malign-branch=jcc+fused+jmp
-malign-branch-prefix-size=5

	* config/tc-i386.c (OPTION_MBRANCHES_WITH_32B_BOUNDARIES): New.
	(md_longopts): Add -mbranches-within-32B-boundaries.
	(md_parse_option): Handle -mbranches-within-32B-boundaries.
	(md_show_usage): Add -mbranches-within-32B-boundaries.
This commit is contained in:
H.J. Lu 2019-12-12 11:57:03 -08:00
parent e379e5f385
commit 76cf450b4c
3 changed files with 31 additions and 0 deletions
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7
gas/ChangeLog
View File

@ -1,3 +1,10 @@
2019-12-12 H.J. Lu <hongjiu.lu@intel.com>
* config/tc-i386.c (OPTION_MBRANCHES_WITH_32B_BOUNDARIES): New.
(md_longopts): Add -mbranches-within-32B-boundaries.
(md_parse_option): Handle -mbranches-within-32B-boundaries.
(md_show_usage): Add -mbranches-within-32B-boundaries.
2019-12-12 H.J. Lu <hongjiu.lu@intel.com>
* config/tc-i386.c (_i386_insn): Add has_gotpc_tls_reloc.

13
gas/config/tc-i386.c
View File

@ -12000,6 +12000,7 @@ const char *md_shortopts = "qnO::";
#define OPTION_MALIGN_BRANCH_BOUNDARY (OPTION_MD_BASE + 27)
#define OPTION_MALIGN_BRANCH_PREFIX_SIZE (OPTION_MD_BASE + 28)
#define OPTION_MALIGN_BRANCH (OPTION_MD_BASE + 29)
#define OPTION_MBRANCHES_WITH_32B_BOUNDARIES (OPTION_MD_BASE + 30)
struct option md_longopts[] =
{
@ -12038,6 +12039,7 @@ struct option md_longopts[] =
{"malign-branch-boundary", required_argument, NULL, OPTION_MALIGN_BRANCH_BOUNDARY},
{"malign-branch-prefix-size", required_argument, NULL, OPTION_MALIGN_BRANCH_PREFIX_SIZE},
{"malign-branch", required_argument, NULL, OPTION_MALIGN_BRANCH},
{"mbranches-within-32B-boundaries", no_argument, NULL, OPTION_MBRANCHES_WITH_32B_BOUNDARIES},
{"mamd64", no_argument, NULL, OPTION_MAMD64},
{"mintel64", no_argument, NULL, OPTION_MINTEL64},
{NULL, no_argument, NULL, 0}
@ -12500,6 +12502,14 @@ md_parse_option (int c, const char *arg)
free (saved);
break;
case OPTION_MBRANCHES_WITH_32B_BOUNDARIES:
align_branch_power = 5;
align_branch_prefix_size = 5;
align_branch = (align_branch_jcc_bit
| align_branch_fused_bit
| align_branch_jmp_bit);
break;
case OPTION_MAMD64:
intel64 = 0;
break;
@ -12763,6 +12773,9 @@ md_show_usage (FILE *stream)
-malign-branch-prefix-size=NUM (default: 5)\n\
align branches with NUM prefixes per instruction\n"));
fprintf (stream, _("\
-mbranches-within-32B-boundaries\n\
align branches within 32 byte boundary\n"));
fprintf (stream, _("\
-mamd64 accept only AMD64 ISA [default]\n"));
fprintf (stream, _("\
-mintel64 accept only Intel64 ISA\n"));

11
gas/doc/c-i386.texi
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@ -449,6 +449,17 @@ This option specifies the maximum number of prefixes on an instruction
to align branches. @var{NUM} should be between 0 and 5. The default
@var{NUM} is 5.
@cindex @samp{-mbranches-within-32B-boundaries} option, i386
@cindex @samp{-mbranches-within-32B-boundaries} option, x86-64
@item -mbranches-within-32B-boundaries
This option aligns conditional jumps, fused conditional jumps and
unconditional jumps within 32 byte boundary with up to 5 segment prefixes
on an instruction. It is equivalent to
@option{-malign-branch-boundary=32}
@option{-malign-branch=jcc+fused+jmp}
@option{-malign-branch-prefix-size=5}.
The default doesn't align branches.
@cindex @samp{-mx86-used-note=} option, i386
@cindex @samp{-mx86-used-note=} option, x86-64
@item -mx86-used-note=@var{no}