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| author | Jan Beulich <jbeulich@novell.com> | 2018-07-31 10:58:05 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2018-07-31 10:58:05 +0200 |
| commit | 1424ad867742286be44932bf29720539add19ae0 (patch) | |
| tree | 5461a39c1b53637faccaf9b1abab4cbf85fa8bf1 /gas/config/tc-i386.c | |
| parent | ae2387feae3f0798dd77c98a7107fdec38a99fe3 (diff) | |
| download | fsf-binutils-gdb-1424ad867742286be44932bf29720539add19ae0.zip fsf-binutils-gdb-1424ad867742286be44932bf29720539add19ae0.tar.gz fsf-binutils-gdb-1424ad867742286be44932bf29720539add19ae0.tar.bz2 | |
x86: also optimize KXOR{D,Q} and KANDN{D,Q}
These can be converted to 2-byte VEX encoding when both source registers
are the same, by using KXORW / KANDNW as replacement.
Diffstat (limited to 'gas/config/tc-i386.c')
| -rw-r--r-- | gas/config/tc-i386.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 8761e97..e07056f 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -3942,7 +3942,11 @@ optimize_encoding (void) || i.tm.base_opcode == 0x66f8 || i.tm.base_opcode == 0x66f9 || i.tm.base_opcode == 0x66fa - || i.tm.base_opcode == 0x66fb) + || i.tm.base_opcode == 0x66fb + || i.tm.base_opcode == 0x42 + || i.tm.base_opcode == 0x6642 + || i.tm.base_opcode == 0x47 + || i.tm.base_opcode == 0x6647) && i.tm.extension_opcode == None)) { /* Optimize: -O2: @@ -3973,6 +3977,12 @@ optimize_encoding (void) EVEX VOP %ymmM, %ymmM, %ymmN -> VEX vpxor %xmmM, %xmmM, %xmmN (M and N < 16) -> EVEX VOP %xmmM, %xmmM, %xmmN (M || N >= 16) + VOP, one of kxord and kxorq: + VEX VOP %kM, %kM, %kN + -> VEX kxorw %kM, %kM, %kN + VOP, one of kandnd and kandnq: + VEX VOP %kM, %kM, %kN + -> VEX kandnw %kM, %kM, %kN */ if (is_evex_encoding (&i.tm)) { @@ -3985,6 +3995,11 @@ optimize_encoding (void) i.tm.opcode_modifier.evex = 0; } } + else if (i.tm.operand_types[0].bitfield.regmask) + { + i.tm.base_opcode &= 0xff; + i.tm.opcode_modifier.vexw = VEXW0; + } else i.tm.opcode_modifier.vex = VEX128; |