VPERM2I128

Permute Integer Values

참고 사항

Instruction Operand Encoding

Description

Permute 128 bit integer data from the first source operand (second operand) and second source operand (third operand) using bits in the 8-bit immediate and store results in the destination operand (first operand). The first source operand is a YMM register, the second source operand is a YMM register or a 256-bit memory location, and the destination operand is a YMM register.

Imm8[1:0] select the source for the first destination 128-bit field, imm8[5:4] select the source for the second destination field. If imm8[3] is set, the low 128-bit field is zeroed. If imm8[7] is set, the high 128-bit field is zeroed.

VEX.L must be 1, otherwise the instruction will #UD.

Operation

VPERM2I128

CASE IMM8[1:0] of 
0: DEST[127:0] <-  SRC1[127:0]
1: DEST[127:0] <-  SRC1[255:128]
2: DEST[127:0] <-  SRC2[127:0]
3: DEST[127:0] <-  SRC2[255:128]
ESAC
CASE IMM8[5:4] of 
0: DEST[255:128] <-  SRC1[127:0]
1: DEST[255:128] <-  SRC1[255:128]
2: DEST[255:128] <-  SRC2[127:0]
3: DEST[255:128] <-  SRC2[255:128]
ESAC
IF (imm8[3])
DEST[127:0] <-  0
FI
IF (imm8[7])
DEST[255:128] <-  0
FI

Intel C/C++ Compiler Intrinsic Equivalent

VPERM2I128 : __m256i _mm256_permute2x128_si256(__m256i a, __m256i b,
                                               int control)

SIMD Floating-Point Exceptions

None

Other Exceptions

See Exceptions Type 6; additionally

#UD If VEX.L = 0,

If VEX.W = 1.

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