모두의 코드
PHMINPOSUW (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 686 번 읽혔습니다.

PHMINPOSUW

Packed Horizontal Word Minimum

참고 사항

아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.

Opcode/
Instruction

Op/
En

64/32 bit
Mode
Support

CPUID
Feature
Flag

Description

66 0F 38 41 /r
PHMINPOSUW xmm1 xmm2/m128

RM

V/V

SSE4_1

Find the minimum unsigned word in xmm2/m128 and place its value in the low word of xmm1 and its index in the second-lowest word of xmm1.

VEX.128.66.0F38.WIG 41 /r
VPHMINPOSUW xmm1 xmm2/m128

RM

V/V

AVX

Find the minimum unsigned word in xmm2/m128 and place its value in the low word of xmm1 and its index in the second-lowest word of xmm1.

Instruction Operand Encoding

Op/En

Operand 1

Operand 2

Operand 3

Operand 4

RM

ModRM:reg (w)

ModRM:r/m (r)

NA

NA

Description

Determine the minimum unsigned word value in the source operand (second operand) and place the unsigned word in the low word (bits 0-15) of the destination operand (first operand). The word index of the minimum value is stored in bits 16-18 of the destination operand. The remaining upper bits of the destination are set to zero.

128-bit Legacy SSE version: Bits (VLMAX-1:128) of the corresponding YMM destination register remain unchanged.

VEX.128 encoded version: Bits (VLMAX-1:128) of the destination YMM register are zeroed. VEX.vvvv is reserved and must be 1111b, VEX.L must be 0, otherwise the instruction will #UD.

Operation

PHMINPOSUW (128-bit Legacy SSE version)

INDEX <-  0;
MIN <-  SRC[15:0]
IF (SRC[31:16] < MIN) 
    THEN INDEX <-  1;  MIN <-  SRC[31:16]; FI;
IF (SRC[47:32] < MIN) 
    THEN INDEX <-  2;  MIN <-  SRC[47:32]; FI;
* Repeat operation for words 3 through 6
IF (SRC[127:112] < MIN) 
    THEN INDEX <-  7;  MIN <-  SRC[127:112]; FI;
DEST[15:0] <-  MIN;
DEST[18:16] <-  INDEX;
DEST[127:19] <-  0000000000000000000000000000H;

VPHMINPOSUW (VEX.128 encoded version)

INDEX <-  0
MIN <-  SRC[15:0]
IF (SRC[31:16] < MIN) THEN INDEX <-  1; MIN <-  SRC[31:16]
IF (SRC[47:32] < MIN) THEN INDEX <-  2; MIN <-  SRC[47:32]
* Repeat operation for words 3 through 6
IF (SRC[127:112] < MIN) THEN INDEX <-  7; MIN <-  SRC[127:112]
DEST[15:0] <-  MIN
DEST[18:16] <-  INDEX
DEST[127:19] <-  0000000000000000000000000000H
DEST[VLMAX-1:128] <-  0

Intel C/C++ Compiler Intrinsic Equivalent

PHMINPOSUW : __m128i _mm_minpos_epu16(__m128i packed_words);

Flags Affected

None.

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Exceptions Type 4; additionally

#UD If VEX.L = 1.

If VEX.vvvv -> 1111B.

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