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x86 Opcode Map

Reverse lookup instructions by their hexadecimal encoding.

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Opcode Mnemonic Syntax Format Name
0F 90 seto SETO r/m8 Legacy Set Byte on Overflow
0F 9A setp SETP r/m8 Legacy Set Byte on Parity
0F 98 sets SETS r/m8 Legacy Set Byte on Sign
0F 94 setz SETZ r/m8 Legacy Set Byte on Zero
NP 0F AE F8 sfence SFENCE SSE Store Fence
0F 01 /0 sgdt SGDT m System Store Global Descriptor Table Register
NP 0F 38 C9 /r sha1msg1 SHA1MSG1 xmm1, xmm2/m128 Legacy SHA1 Message Schedule 1
NP 0F 38 CA /r sha1msg2 SHA1MSG2 xmm1, xmm2/m128 Legacy SHA1 Message Schedule 2
NP 0F 38 C8 /r sha1nexte SHA1NEXTE xmm1, xmm2/m128 Legacy SHA1 State Variable E
NP 0F 3A CC /r ib sha1rnds4 SHA1RNDS4 xmm1, xmm2/m128, imm8 Legacy SHA1 Rounds 4
NP 0F 38 CC /r sha256msg1 SHA256MSG1 xmm1, xmm2/m128 Legacy SHA256 Message Schedule 1
NP 0F 38 CD /r sha256msg2 SHA256MSG2 xmm1, xmm2/m128 Legacy SHA256 Message Schedule 2
NP 0F 38 CB /r sha256rnds2 SHA256RNDS2 xmm1, xmm2/m128, xmm0 Legacy SHA256 Rounds 2
C1 /4 shl SHL r/m, imm8 Legacy Shift Logical Left
0F A4 shld SHLD r/m, r, imm8 Legacy Double Precision Shift Left
VEX.LZ.66.0F38.W0 F7 /r shlx SHLX r32, r/m32, r32 VEX Shift Logical Left Without Affecting Flags
C1 /5 shr SHR r/m, imm8 Legacy Shift Logical Right
0F AC shrd SHRD r/m, r, imm8 Legacy Double Precision Shift Right
VEX.LZ.F2.0F38.W0 F7 /r shrx SHRX r32, r/m32, r32 VEX Shift Logical Right Without Affecting Flags
66 0F C6 shufpd SHUFPD xmm1, xmm2/m128, imm8 SSE2 Shuffle Packed Double-Precision
NP 0F C6 /r ib shufps SHUFPS xmm1, xmm2/m128, imm8 SSE Shuffle Packed Single-Precision
0F 01 /1 sidt SIDT m System Store Interrupt Descriptor Table Register
0F 00 /0 sldt SLDT r/m16 System Store Local Descriptor Table Register
0F 01 /4 smsw SMSW r/m16 System Store Machine Status Word
66 0F 51 sqrtpd SQRTPD xmm, xmm/m128 SSE2 Square Root Packed Double-Precision
NP 0F 51 /r sqrtps SQRTPS xmm, xmm/m128 SSE Square Root Packed Single-Precision
F2 0F 51 sqrtsd SQRTSD xmm1, xmm2/m64 SSE2 Square Root Scalar Double-Precision
F3 0F 51 sqrtss SQRTSS xmm1, xmm2/m32 SSE Square Root Scalar Single-Precision
NP 0F 01 CB stac STAC Legacy Set AC Flag in EFLAGS
F9 stc STC Legacy Set Carry Flag
FD std STD Legacy Set Direction Flag
0F 01 DC stgi STGI SVM Set Global Interrupt Flag
FB sti STI Legacy Set Interrupt Flag
NP 0F AE /3 stmxcsr STMXCSR m32 SSE Store MXCSR Register
AA stos STOSB Legacy Store String
AB stosd STOSD Legacy Store String Doubleword
REX.W + AB stosq STOSQ Legacy Store String Quadword
AB stosw STOSW Legacy Store String Word
0F 00 /1 str STR r/m16 System Store Task Register
VEX.128.66.0F38.W0 49 !(11):000:bbb sttilecfg STTILECFG m512 VEX Store Tile Configuration
F3 0F 01 EF stui STUI Legacy Set User Interrupt Flag
29 sub SUB r/m, r Legacy Subtract
66 0F 5C subpd SUBPD xmm, xmm/m128 SSE2 Subtract Packed Double-Precision
NP 0F 5C /r subps SUBPS xmm, xmm/m128 SSE Subtract Packed Single-Precision
F2 0F 5C subsd SUBSD xmm1, xmm2/m64 SSE2 Subtract Scalar Double-Precision
F3 0F 5C subss SUBSS xmm1, xmm2/m32 SSE Subtract Scalar Single-Precision
0F 01 F8 swapgs SWAPGS Legacy Swap GS Base Register
0F 05 syscall SYSCALL System System Call
0F 34 sysenter SYSENTER System Fast System Call
0F 35 sysexit SYSEXIT System Fast Return from System Call
0F 07 sysret SYSRET System Return from System Call
XOP.L0.09.W0 01 /7 t1mskc T1MSKC r32, r/m32 TBM Inverse Mask From Trailing Ones
VEX.128.F3.0F38.W0 5C 11:rrr:bbb tdpbf16ps TDPBF16PS tmm1, tmm2, tmm3 VEX Tile Dot Product BFloat16 Packed Single
VEX.128.F2.0F38.W0 5E 11:rrr:bbb tdpbssd TDPBSSD tmm1, tmm2, tmm3 VEX Tile Dot Product Byte Signed Signed Doubleword
VEX.128.F3.0F38.W0 5E 11:rrr:bbb tdpbsud TDPBSUD tmm1, tmm2, tmm3 VEX Tile Dot Product Byte Signed Unsigned Doubleword
VEX.128.66.0F38.W0 5E 11:rrr:bbb tdpbusd TDPBUSD tmm1, tmm2, tmm3 VEX Tile Dot Product Byte Unsigned Signed Doubleword
VEX.128.NP.0F38.W0 5E 11:rrr:bbb tdpbuud TDPBUUD tmm1, tmm2, tmm3 VEX Tile Dot Product Byte Unsigned Unsigned Doubleword
VEX.128.F2.0F38.W0 5C 11:rrr:bbb tdpfp16ps TDPFP16PS tmm1, tmm2, tmm3 VEX Tile Dot Product FP16 Packed Single
85 test TEST r/m, r Legacy Logical Compare
F3 0F 01 ED testui TESTUI Legacy Test User Interrupt
VEX.128.F2.0F38.W0 4B !(11):rrr:100 tileloadd TILELOADD tmm1, m VEX Load Tile Data
VEX.128.66.0F38.W0 4B !(11):rrr:100 tileloaddt1 TILELOADDT1 tmm1, m VEX Load Tile Data (T1 Hint)
VEX.128.F3.0F38.W0 4B !(11):rrr:100 tilestored TILESTORED m, tmm1 VEX Store Tile Data
VEX.128.F2.0F38.W0 49 11:rrr:000 tilezero TILEZERO tmm1 VEX Zero Tile
66 0F AE 11:110:bbb tpause TPAUSE r32 Legacy Timed Pause
F3 0F BC tzcnt TZCNT r32, r/m32 Legacy Count Trailing Zeros
XOP.L0.09.W0 01 /4 tzmsk TZMSK r32, r/m32 TBM Mask From Trailing Zeros
66 0F 2E ucomisd UCOMISD xmm1, xmm2/m64 SSE2 Unordered Compare Scalar Double-Precision
NP 0F 2E /r ucomiss UCOMISS xmm1, xmm2/m32 SSE Unordered Compare Scalar Single-Precision
0F FF /r ud0 UD0 Legacy Undefined Instruction 0
0F 0B ud2 UD2 Legacy Undefined Instruction
F3 0F 01 EC uiret UIRET Legacy User Interrupt Return
F3 0F AE 11:110:bbb umonitor UMONITOR r64 Legacy User Level Monitor
F2 0F AE /6 umwait UMWAIT r32 Legacy User Level Monitor Wait
66 0F 15 unpckhpd UNPCKHPD xmm1, xmm2/m128 SSE2 Unpack High Packed Double-Precision
NP 0F 15 /r unpckhps UNPCKHPS xmm1, xmm2/m128 SSE Unpack High Packed Single-Precision
66 0F 14 unpcklpd UNPCKLPD xmm1, xmm2/m128 SSE2 Unpack Low Packed Double-Precision
NP 0F 14 /r unpcklps UNPCKLPS xmm1, xmm2/m128 SSE Unpack Low Packed Single-Precision
EVEX.512.F2.0F38.W0 9A /r v4fmaddps V4FMADDPS zmm1 {k1}, zmm2+3, m128 EVEX Fused Multiply-Add Packed Single (4-iterations)
EVEX.LLIG.F2.0F38.W0 9B /r v4fmaddss V4FMADDSS xmm1 {k1}, xmm2+3, m128 EVEX Fused Multiply-Add Scalar Single (4-iterations)
EVEX.512.F2.0F38.W0 AA /r v4fnmaddps V4FNMADDPS zmm1 {k1}, zmm2+3, m128 EVEX Fused Negative Multiply-Add Packed Single (4-iterations)
EVEX.LLIG.F2.0F38.W0 AB /r v4fnmaddss V4FNMADDSS xmm1 {k1}, xmm2+3, m128 EVEX Fused Negative Multiply-Add Scalar Single (4-iterations)
EVEX.512.NP.MAP5.W0 58 /r vaddph VADDPH zmm1 {k1}, zmm2, zmm3/m512 EVEX Add Packed FP16 Values
VEX.256.0F.WIG 58 /r vaddps VADDPS ymm1, ymm2, ymm3/m256 VEX Add Packed Single-Precision (AVX)
EVEX.LLIG.F3.MAP5.W0 58 /r vaddsh VADDSH xmm1 {k1}, xmm2, xmm3/m16 EVEX Add Scalar Half-Precision
EVEX.LLIG.F3.0F.W0 58 /r vaddss VADDSS xmm1 {k1}, xmm2, xmm3/m32 EVEX Add Scalar Single-Precision (EVEX)
EVEX.512.66.0F38.WIG DE /r vaesdec VAESDEC zmm1, zmm2, zmm3/m512 EVEX Vector AES Decrypt (AVX512)
EVEX.512.66.0F38.WIG DC /r vaesenc VAESENC zmm1, zmm2, zmm3/m512 EVEX Vector AES Encrypt (AVX512)
EVEX.512.66.0F3A.W0 03 /r ib valignd VALIGND zmm1 {k1}, zmm2, zmm3/m512, imm8 EVEX Align Doubleword Vectors
EVEX.512.66.0F3A.W1 03 /r ib valignq VALIGNQ zmm1 {k1}, zmm2, zmm3/m512, imm8 EVEX Align Quadword Vectors
VEX.256.66.0F38.W0 1A /r vbroadcastf128 VBROADCASTF128 ymm1, m128 VEX Broadcast 128-bit Floating-Point
VEX.256.66.0F38.W0 5A /r vbroadcasti128 VBROADCASTI128 ymm1, m128 VEX Broadcast 128-bit Integer
VEX.256.66.0F38.W0 19 /r vbroadcastsd VBROADCASTSD ymm1, m64 VEX Broadcast Scalar Double
VEX.256.66.0F38.W0 18 /r vbroadcastss VBROADCASTSS ymm1, m32 AVX Broadcast Scalar Single
VEX.256.66.0F.WIG C2 /r ib vcmppd VCMPPD ymm1, ymm2, ymm3/m256, imm8 VEX Compare Packed Double-Precision (AVX)
VEX.256.0F.WIG C2 /r ib vcmpps VCMPPS ymm1, ymm2, ymm3/m256, imm8 VEX Compare Packed Single-Precision (AVX)
EVEX.512.66.0F38.W1 8A /r vcompresspd VCOMPRESSPD m512 {k1}, zmm1 EVEX Store Sparse Packed Double-Precision Floating-Point Values
EVEX.512.66.0F38.W0 8A /r vcompressps VCOMPRESSPS m512 {k1}, zmm1 EVEX Store Sparse Packed Single-Precision Floating-Point Values
VEX.256.0F.WIG 5B /r vcvtdq2ps VCVTDQ2PS ymm1, ymm2/m256 VEX Convert Packed Doubleword to Packed Single
EVEX.512.F2.0F38.W0 72 /r vcvtne2ps2bf16 VCVTNE2PS2BF16 zmm1 {k1}, zmm2, zmm3/m512 EVEX Convert Two Packed Single to Packed BFloat16