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x86: improve/shorten vector zeroing-idiom optimization conditional

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- Drop the rounding type check: We're past template matching, and none
  of the involved insns support embedded rounding.
- Drop the extension opcode check: None of the involved opcodes have
  variants with it being other than None.
- Instead check opcode space, even if just to be on the safe side going
  forward.
- Reduce the number of comparisons by folding two groups.
This commit is contained in:
Jan Beulich
2022-08-03 09:01:10 +02:00
parent 0aea480cd8
commit 5844ccaac7
1 changed files with 7 additions and 12 deletions
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19
gas/config/tc-i386.c
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@ -4329,24 +4329,19 @@ optimize_encoding (void)
&& !i.types[2].bitfield.xmmword
&& (i.tm.opcode_modifier.vex
|| ((!i.mask.reg || i.mask.zeroing)
&& i.rounding.type == rc_none
&& is_evex_encoding (&i.tm)
&& (i.vec_encoding != vex_encoding_evex
|| cpu_arch_isa_flags.bitfield.cpuavx512vl
|| i.tm.cpu_flags.bitfield.cpuavx512vl
|| (i.tm.operand_types[2].bitfield.zmmword
&& i.types[2].bitfield.ymmword))))
&& ((i.tm.base_opcode == 0x55
|| i.tm.base_opcode == 0x57
|| i.tm.base_opcode == 0xdf
|| i.tm.base_opcode == 0xef
|| i.tm.base_opcode == 0xf8
|| i.tm.base_opcode == 0xf9
|| i.tm.base_opcode == 0xfa
|| i.tm.base_opcode == 0xfb
|| i.tm.base_opcode == 0x42
|| i.tm.base_opcode == 0x47)
&& i.tm.extension_opcode == None))
&& i.tm.opcode_modifier.opcodespace == SPACE_0F
&& ((i.tm.base_opcode | 2) == 0x57
|| i.tm.base_opcode == 0xdf
|| i.tm.base_opcode == 0xef
|| (i.tm.base_opcode | 3) == 0xfb
|| i.tm.base_opcode == 0x42
|| i.tm.base_opcode == 0x47))
{
/* Optimize: -O1:
VOP, one of vandnps, vandnpd, vxorps, vxorpd, vpsubb, vpsubd,