diff options
Diffstat (limited to 'gas/config/tc-i386.c')
| -rw-r--r-- | gas/config/tc-i386.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index eb3f128..8ebeaf1 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -4580,6 +4580,46 @@ optimize_encoding (void) i.tm.opcode_space = SPACE_0F; i.tm.base_opcode = 0x76; } + else if (((i.tm.base_opcode >= 0x64 + && i.tm.base_opcode <= 0x66 + && i.tm.opcode_space == SPACE_0F) + || (i.tm.base_opcode == 0x37 + && i.tm.opcode_space == SPACE_0F38)) + && i.operands == i.reg_operands + && i.op[0].regs == i.op[1].regs + && !is_evex_encoding (&i.tm)) + { + /* Optimize: -O: + pcmpgt[bwd] %mmN, %mmN -> pxor %mmN, %mmN + pcmpgt[bwdq] %xmmN, %xmmN -> pxor %xmmN, %xmmN + vpcmpgt[bwdq] %xmmN, %xmmN, %xmmM -> vpxor %xmmN, %xmmN, %xmmM (N < 8) + vpcmpgt[bwdq] %xmmN, %xmmN, %xmmM -> vpxor %xmm0, %xmm0, %xmmM (N > 7) + vpcmpgt[bwdq] %ymmN, %ymmN, %ymmM -> vpxor %ymmN, %ymmN, %ymmM (N < 8) + vpcmpgt[bwdq] %ymmN, %ymmN, %ymmM -> vpxor %ymm0, %ymm0, %ymmM (N > 7) + */ + i.tm.opcode_space = SPACE_0F; + i.tm.base_opcode = 0xef; + if (i.tm.opcode_modifier.vex && (i.op[0].regs->reg_flags & RegRex)) + { + if (i.operands == 2) + { + gas_assert (i.tm.opcode_modifier.sse2avx); + + i.operands = 3; + i.reg_operands = 3; + i.tm.operands = 3; + + i.op[2].regs = i.op[0].regs; + i.types[2] = i.types[0]; + i.flags[2] = i.flags[0]; + i.tm.operand_types[2] = i.tm.operand_types[0]; + + i.tm.opcode_modifier.sse2avx = 0; + } + i.op[0].regs -= i.op[0].regs->reg_num + 8; + i.op[1].regs = i.op[0].regs; + } + } } /* Return non-zero for load instruction. */ |