VPERM2F128 — Permute Floating-Point Values
| Opcode/Instruction |
Op/En |
64/32 bit Mode Support |
CPUID Feature Flag |
Description |
| VEX.NDS.256.66.0F3A.W0 06 /r ib VPERM2F128 ymm1, ymm2, ymm3/m256, imm8 |
RVMI |
V/V |
AVX |
Permute 128-bit floating-point fields in ymm2 and ymm3/mem using controls from imm8 and store result in ymm1. |
Instruction Operand Encoding
| Op/En |
Operand 1 |
Operand 2 |
Operand 3 |
Operand 4 |
| RVMI |
ModRM:reg (w) |
VEX.vvvv (r) |
ModRM:r/m (r) |
imm8 |
Description
Permute 128 bit floating-point-containing fields 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.
| SRC2 |
Y1 |
Y0 |
| SRC1 |
X1 |
X0 |
| DEST |
X0, X1, Y0, or Y1 Figure 4-42. |
X0, X1, Y0, or Y1 VPERM2F128 Operation |
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
VPERM2F128
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[VLMAX-1:128] ← 0
FI
Intel C/C++ Compiler Intrinsic Equivalent
| VPERM2F128: |
__m256 _mm256_permute2f128_ps (__m256 a, __m256 b, int control) |
| VPERM2F128: |
__m256d _mm256_permute2f128_pd (__m256d a, __m256d b, int control) |
| VPERM2F128: |
__m256i _mm256_permute2f128_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. |