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| author | Jan Beulich <jbeulich@suse.com> | 2024-01-26 10:31:38 +0100 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2024-01-26 10:31:38 +0100 |
| commit | 0ebcbb1bd03c4fde91b032b50ec9c3a8f376b8be (patch) | |
| tree | 028ab219218cc96320f7d3decb8a68829fd4904e /opcodes/i386-opc.tbl | |
| parent | cd35c9fd1e67b2dd8acbda3dfa398e395b22f220 (diff) | |
| download | fsf-binutils-gdb-0ebcbb1bd03c4fde91b032b50ec9c3a8f376b8be.zip fsf-binutils-gdb-0ebcbb1bd03c4fde91b032b50ec9c3a8f376b8be.tar.gz fsf-binutils-gdb-0ebcbb1bd03c4fde91b032b50ec9c3a8f376b8be.tar.bz2 | |
x86/APX: optimize MOVBE
With identical source and destination it can be covered by the NDD-to-
legacy conversion logic as well, even if in this case the original insn
doesn't use an NDD encoding. The size savings are even better here, for
the replacement (BSWAP) not having a ModR/M byte.
Diffstat (limited to 'opcodes/i386-opc.tbl')
| -rw-r--r-- | opcodes/i386-opc.tbl | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/opcodes/i386-opc.tbl b/opcodes/i386-opc.tbl index 717e208..55c704b 100644 --- a/opcodes/i386-opc.tbl +++ b/opcodes/i386-opc.tbl @@ -210,6 +210,9 @@ mov, 0xf24, i386&No64, D|RegMem|IgnoreSize|No_bSuf|No_wSuf|No_sSuf|No_qSuf, { Te // Move after swapping the bytes movbe, 0x0f38f0, Movbe, D|Modrm|CheckOperandSize|No_bSuf|No_sSuf, { Word|Dword|Qword|Unspecified|BaseIndex, Reg16|Reg32|Reg64 } movbe, 0x60, Movbe&APX_F, D|Modrm|CheckOperandSize|No_bSuf|No_sSuf|EVexMap4, { Reg16|Reg32|Reg64|Unspecified|BaseIndex, Reg16|Reg32|Reg64 } +// This needs to live here for easy EVEX -> REX2 conversion, which wants to +// restart with the next sequential template. +bswap, 0xfc8, i486, No_bSuf|No_wSuf|No_sSuf, { Reg32|Reg64 } // Move with sign extend. movsb, 0xfbe, i386, Modrm|No_bSuf|No_sSuf, { Reg8|Unspecified|BaseIndex, Reg16|Reg32|Reg64 } @@ -980,9 +983,8 @@ rex.wrxb, 0x4f, x64, NoSuf|IsPrefix, {} {<pseudopfx>}, PSEUDO_PREFIX/Prefix_<pseudopfx:ident>, <pseudopfx:cpu>, NoSuf|IsPrefix, {} -// 486 extensions. +// 486 extensions (BSWAP moved elsewhere). -bswap, 0xfc8, i486, No_bSuf|No_wSuf|No_sSuf, { Reg32|Reg64 } xadd, 0xfc0, i486, W|CheckOperandSize|Modrm|No_sSuf|HLEPrefixLock, { Reg8|Reg16|Reg32|Reg64, Reg8|Reg16|Reg32|Reg64|Unspecified|BaseIndex } cmpxchg, 0xfb0, i486, W|CheckOperandSize|Modrm|No_sSuf|HLEPrefixLock, { Reg8|Reg16|Reg32|Reg64, Reg8|Reg16|Reg32|Reg64|Unspecified|BaseIndex } invd, 0xf08, i486, NoSuf, {} |