diff options
Diffstat (limited to 'gas/config/tc-i386.c')
| -rw-r--r-- | gas/config/tc-i386.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 339f9694948..ef30a6bc0e9 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -800,6 +800,9 @@ static unsigned int no_cond_jump_promotion = 0; /* Encode SSE instructions with VEX prefix. */ static unsigned int sse2avx; +/* Encode aligned vector move as unaligned vector move. */ +static unsigned int use_unaligned_vector_move; + /* Encode scalar AVX instructions with specific vector length. */ static enum { @@ -4073,6 +4076,30 @@ check_hle (void) } } +/* Encode aligned vector move as unaligned vector move. */ + +static void +encode_with_unaligned_vector_move (void) +{ + switch (i.tm.base_opcode) + { + case 0x28: + /* movaps/movapd/vmovaps/vmovapd. */ + if (i.tm.opcode_modifier.opcodespace == SPACE_0F + && i.tm.opcode_modifier.opcodeprefix <= PREFIX_0X66) + i.tm.base_opcode = 0x10; + break; + case 0x6f: + /* movdqa/vmovdqa/vmovdqa64/vmovdqa32. */ + if (i.tm.opcode_modifier.opcodespace == SPACE_0F + && i.tm.opcode_modifier.opcodeprefix == PREFIX_0X66) + i.tm.opcode_modifier.opcodeprefix = PREFIX_0XF3; + break; + default: + break; + } +} + /* Try the shortest encoding by shortening operand size. */ static void @@ -5056,6 +5083,9 @@ md_assemble (char *line) if (optimize && !i.no_optimize && i.tm.opcode_modifier.optimize) optimize_encoding (); + if (use_unaligned_vector_move) + encode_with_unaligned_vector_move (); + if (!process_suffix ()) return; @@ -13060,6 +13090,7 @@ const char *md_shortopts = "qnO::"; #define OPTION_MLFENCE_AFTER_LOAD (OPTION_MD_BASE + 31) #define OPTION_MLFENCE_BEFORE_INDIRECT_BRANCH (OPTION_MD_BASE + 32) #define OPTION_MLFENCE_BEFORE_RET (OPTION_MD_BASE + 33) +#define OPTION_MUSE_UNALIGNED_VECTOR_MOVE (OPTION_MD_BASE + 34) struct option md_longopts[] = { @@ -13081,6 +13112,7 @@ struct option md_longopts[] = {"mindex-reg", no_argument, NULL, OPTION_MINDEX_REG}, {"mnaked-reg", no_argument, NULL, OPTION_MNAKED_REG}, {"msse2avx", no_argument, NULL, OPTION_MSSE2AVX}, + {"muse-unaligned-vector-move", no_argument, NULL, OPTION_MUSE_UNALIGNED_VECTOR_MOVE}, {"msse-check", required_argument, NULL, OPTION_MSSE_CHECK}, {"moperand-check", required_argument, NULL, OPTION_MOPERAND_CHECK}, {"mavxscalar", required_argument, NULL, OPTION_MAVXSCALAR}, @@ -13381,6 +13413,10 @@ md_parse_option (int c, const char *arg) sse2avx = 1; break; + case OPTION_MUSE_UNALIGNED_VECTOR_MOVE: + use_unaligned_vector_move = 1; + break; + case OPTION_MSSE_CHECK: if (strcasecmp (arg, "error") == 0) sse_check = check_error; @@ -13796,6 +13832,9 @@ md_show_usage (FILE *stream) fprintf (stream, _("\ -msse2avx encode SSE instructions with VEX prefix\n")); fprintf (stream, _("\ + -muse-unaligned-vector-move\n\ + encode aligned vector move as unaligned vector move\n")); + fprintf (stream, _("\ -msse-check=[none|error|warning] (default: warning)\n\ check SSE instructions\n")); fprintf (stream, _("\ |