Intel® Architecture Instruction Set Extensions Programming Reference

VEXTRACTI128 — Extract packed Integer Values
Opcode/
Instruction
Description
Instruction Operand Encoding
INSTRUCTION SET REFERENCE
Extracts 128-bits of packed integer values from the source operand (second operand) at a 128-bit offset from
imm8[0] into the destination operand (first operand). The destination may be either an XMM register or a 128-bit
memory location.
VEX.vvvv is reserved and must be 1111b otherwise instructions will #UD.
The high 7 bits of the immediate are ignored.
An attempt to execute VEXTRACTI128 encoded with VEX.L= 0 will cause an #UD exception.
Operation
VEXTRACTI128 (memory destination form)
CASE (imm8[0]) OF
0: DEST[127:0] SRC1[127:0]
1: DEST[127:0] SRC1[255:128]
ESAC.
VEXTRACTI128 (register destination form)
CASE (imm8[0]) OF
0: DEST[127:0] SRC1[127:0]
1: DEST[127:0] SRC1[255:128]
ESAC.
DEST[VLMAX:128] 0
Intel C/C++ Compiler Intrinsic Equivalent
VEXTRACTI128: __m128i _mm256_extracti128_si256(__m256i a, int offset);
SIMD Floating-Point Exceptions
None
Other Exceptions
Op/
En
See Exceptions Type 6; additionally
#UD IF VEX.L = 0,
If VEX.W = 1.
64/32
-bit
Modet
CPUID
Feature
Flag
Description
VEX.256.66.0F3A.W0 39 /r ib A V/V AVX2 Extract 128 bits of integer data from ymm2 and store results in
xmm1/mem.
VEXTRACTI128
xmm1/m128, ymm2, imm8
Op/En Operand 1 Operand 2 Operand 3 Operand 4
A ModRM:r/m (w) ModRM:reg (r) NA NA
Ref. # 319433-014 5-191