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x86: re-arrange order of decode for various legacy opcodes

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The order of decodes influences the overall number of table entries.
Reduce table size quite a bit by first decoding few-alternatives
attributes common to all valid leaves.
This commit is contained in:
Jan Beulich
2021-03-10 08:15:10 +01:00
parent 319419837c
commit 00ec187565
2 changed files with 43 additions and 70 deletions
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15
opcodes/ChangeLog
View File

@ -1,3 +1,18 @@
2021-03-10 Jan Beulich <jbeulich@suse.com>
* opcodes/i386-dis.c (REG_0F71, REG_0F72, REG_0F73): Rename to
REG_0F71_MOD_0, REG_0F72_MOD_0, and REG_0F73_MOD_0 respectively.
(MOD_0F71_REG_2, MOD_0F71_REG_4, MOD_0F71_REG_6, MOD_0F72_REG_2,
MOD_0F72_REG_4, MOD_0F72_REG_6, MOD_0F73_REG_2, MOD_0F73_REG_3,
MOD_0F73_REG_6, MOD_0F73_REG_7): Delete.
(MOD_0F71, MOD_0F72, MOD_0F73): New.
(dis386_twobyte): Link to mod_table[] for opcodes 71, 72, and
73.
(reg_table): No longer link to mod_table[] for opcodes 0F71,
0F72, and 0F73.
(mod_table): Link to reg_table[] for opcodes 0F71, 0F72, and
0F73.
2021-03-10 Jan Beulich <jbeulich@suse.com>
* opcodes/i386-dis.c (MOD_0F18_REG_4, MOD_0F18_REG_5,

98
opcodes/i386-dis.c
View File

@ -693,9 +693,9 @@ enum
REG_0F1E_P_1_MOD_3,
REG_0F38D8_PREFIX_1,
REG_0F3A0F_PREFIX_1_MOD_3,
REG_0F71,
REG_0F72,
REG_0F73,
REG_0F71_MOD_0,
REG_0F72_MOD_0,
REG_0F73_MOD_0,
REG_0FA6,
REG_0FA7,
REG_0FAE,
@ -753,16 +753,9 @@ enum
MOD_0F2B_PREFIX_2,
MOD_0F2B_PREFIX_3,
MOD_0F50,
MOD_0F71_REG_2,
MOD_0F71_REG_4,
MOD_0F71_REG_6,
MOD_0F72_REG_2,
MOD_0F72_REG_4,
MOD_0F72_REG_6,
MOD_0F73_REG_2,
MOD_0F73_REG_3,
MOD_0F73_REG_6,
MOD_0F73_REG_7,
MOD_0F71,
MOD_0F72,
MOD_0F73,
MOD_0FAE_REG_0,
MOD_0FAE_REG_1,
MOD_0FAE_REG_2,
@ -2244,9 +2237,9 @@ static const struct dis386 dis386_twobyte[] = {
{ PREFIX_TABLE (PREFIX_0F6F) },
/* 70 */
{ PREFIX_TABLE (PREFIX_0F70) },
{ REG_TABLE (REG_0F71) },
{ REG_TABLE (REG_0F72) },
{ REG_TABLE (REG_0F73) },
{ MOD_TABLE (MOD_0F71) },
{ MOD_TABLE (MOD_0F72) },
{ MOD_TABLE (MOD_0F73) },
{ "pcmpeqb", { MX, EM }, PREFIX_OPCODE },
{ "pcmpeqw", { MX, EM }, PREFIX_OPCODE },
{ "pcmpeqd", { MX, EM }, PREFIX_OPCODE },
@ -2941,36 +2934,36 @@ static const struct dis386 reg_table[][8] = {
{
{ RM_TABLE (RM_0F3A0F_P_1_MOD_3_REG_0) },
},
/* REG_0F71 */
/* REG_0F71_MOD_0 */
{
{ Bad_Opcode },
{ Bad_Opcode },
{ MOD_TABLE (MOD_0F71_REG_2) },
{ "psrlw", { MS, Ib }, PREFIX_OPCODE },
{ Bad_Opcode },
{ MOD_TABLE (MOD_0F71_REG_4) },
{ "psraw", { MS, Ib }, PREFIX_OPCODE },
{ Bad_Opcode },
{ MOD_TABLE (MOD_0F71_REG_6) },
{ "psllw", { MS, Ib }, PREFIX_OPCODE },
},
/* REG_0F72 */
/* REG_0F72_MOD_0 */
{
{ Bad_Opcode },
{ Bad_Opcode },
{ MOD_TABLE (MOD_0F72_REG_2) },
{ "psrld", { MS, Ib }, PREFIX_OPCODE },
{ Bad_Opcode },
{ MOD_TABLE (MOD_0F72_REG_4) },
{ "psrad", { MS, Ib }, PREFIX_OPCODE },
{ Bad_Opcode },
{ MOD_TABLE (MOD_0F72_REG_6) },
{ "pslld", { MS, Ib }, PREFIX_OPCODE },
},
/* REG_0F73 */
/* REG_0F73_MOD_0 */
{
{ Bad_Opcode },
{ Bad_Opcode },
{ MOD_TABLE (MOD_0F73_REG_2) },
{ MOD_TABLE (MOD_0F73_REG_3) },
{ "psrlq", { MS, Ib }, PREFIX_OPCODE },
{ "psrldq", { XS, Ib }, PREFIX_DATA },
{ Bad_Opcode },
{ Bad_Opcode },
{ MOD_TABLE (MOD_0F73_REG_6) },
{ MOD_TABLE (MOD_0F73_REG_7) },
{ "psllq", { MS, Ib }, PREFIX_OPCODE },
{ "pslldq", { XS, Ib }, PREFIX_DATA },
},
/* REG_0FA6 */
{
@ -8261,54 +8254,19 @@ static const struct dis386 mod_table[][2] = {
{ "movmskpX", { Gdq, XS }, PREFIX_OPCODE },
},
{
/* MOD_0F71_REG_2 */
/* MOD_0F71 */
{ Bad_Opcode },
{ "psrlw", { MS, Ib }, PREFIX_OPCODE },
{ REG_TABLE (REG_0F71_MOD_0) },
},
{
/* MOD_0F71_REG_4 */
/* MOD_0F72 */
{ Bad_Opcode },
{ "psraw", { MS, Ib }, PREFIX_OPCODE },
{ REG_TABLE (REG_0F72_MOD_0) },
},
{
/* MOD_0F71_REG_6 */
/* MOD_0F73 */
{ Bad_Opcode },
{ "psllw", { MS, Ib }, PREFIX_OPCODE },
},
{
/* MOD_0F72_REG_2 */
{ Bad_Opcode },
{ "psrld", { MS, Ib }, PREFIX_OPCODE },
},
{
/* MOD_0F72_REG_4 */
{ Bad_Opcode },
{ "psrad", { MS, Ib }, PREFIX_OPCODE },
},
{
/* MOD_0F72_REG_6 */
{ Bad_Opcode },
{ "pslld", { MS, Ib }, PREFIX_OPCODE },
},
{
/* MOD_0F73_REG_2 */
{ Bad_Opcode },
{ "psrlq", { MS, Ib }, PREFIX_OPCODE },
},
{
/* MOD_0F73_REG_3 */
{ Bad_Opcode },
{ "psrldq", { XS, Ib }, PREFIX_DATA },
},
{
/* MOD_0F73_REG_6 */
{ Bad_Opcode },
{ "psllq", { MS, Ib }, PREFIX_OPCODE },
},
{
/* MOD_0F73_REG_7 */
{ Bad_Opcode },
{ "pslldq", { XS, Ib }, PREFIX_DATA },
{ REG_TABLE (REG_0F73_MOD_0) },
},
{
/* MOD_0FAE_REG_0 */