모두의 코드
VPERM2F128 (Intel x86/64 assembly instruction)
VPERM2F128
Permute Floating-Point Values
참고 사항
아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.
Opcode/ | Op/ | 64/32 bit | CPUID | Description |
|---|---|---|---|---|
| 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.
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.
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