# PCMPGTB/PCMPGTW/PCMPGTD — Compare Packed Signed Integers for Greater Than

Opcode/Instruction | Op/En | 64/32 bit Mode Support | CPUID Feature Flag | Description
--- | --- | --- | --- | ---
NP 0F 64 /r1 PCMPGTB mm, mm/m64 | A | V/V | MMX | Compare packed signed byte integers in mm and mm/m64 for greater than.
66 0F 64 /r PCMPGTB xmm1, xmm2/m128 | A | V/V | SSE2 | Compare packed signed byte integers in xmm1 and xmm2/m128 for greater than.
NP 0F 65 /r1 PCMPGTW mm, mm/m64 | A | V/V | MMX | Compare packed signed word integers in mm and mm/m64 for greater than.
66 0F 65 /r PCMPGTW xmm1, xmm2/m128 | A | V/V | SSE2 | Compare packed signed word integers in xmm1 and xmm2/m128 for greater than.
NP 0F 66 /r1 PCMPGTD mm, mm/m64 | A | V/V | MMX | Compare packed signed doubleword integers in mm and mm/m64 for greater than.
66 0F 66 /r PCMPGTD xmm1, xmm2/m128 | A | V/V | SSE2 | Compare packed signed doubleword integers in xmm1 and xmm2/m128 for greater than.
VEX.128.66.0F.WIG 64 /r VPCMPGTB xmm1, xmm2, xmm3/m128 | B | V/V | AVX | Compare packed signed byte integers in xmm2 and xmm3/m128 for greater than.
VEX.128.66.0F.WIG 65 /r VPCMPGTW xmm1, xmm2, xmm3/m128 | B | V/V | AVX | Compare packed signed word integers in xmm2 and xmm3/m128 for greater than.
VEX.128.66.0F.WIG 66 /r VPCMPGTD xmm1, xmm2, xmm3/m128 | B | V/V | AVX | Compare packed signed doubleword integers in xmm2 and xmm3/m128 for greater than.
VEX.256.66.0F.WIG 64 /r VPCMPGTB ymm1, ymm2, ymm3/m256 | B | V/V | AVX2 | Compare packed signed byte integers in ymm2 and ymm3/m256 for greater than.
VEX.256.66.0F.WIG 65 /r VPCMPGTW ymm1, ymm2, ymm3/m256 | B | V/V | AVX2 | Compare packed signed word integers in ymm2 and ymm3/m256 for greater than.
VEX.256.66.0F.WIG 66 /r VPCMPGTD ymm1, ymm2, ymm3/m256 | B | V/V | AVX2 | Compare packed signed doubleword integers in ymm2 and ymm3/m256 for greater than.
EVEX.128.66.0F.W0 66 /r VPCMPGTD k1 {k2}, xmm2, xmm3/m128/m32bcst | C | V/V | AVX512VL AVX512F | Compare Greater between int32 vector xmm2 and int32 vector xmm3/m128/m32bcst, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.
EVEX.256.66.0F.W0 66 /r VPCMPGTD k1 {k2}, ymm2, ymm3/m256/m32bcst | C | V/V | AVX512VL AVX512F | Compare Greater between int32 vector ymm2 and int32 vector ymm3/m256/m32bcst, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.
EVEX.512.66.0F.W0 66 /r VPCMPGTD k1 {k2}, zmm2, zmm3/m512/m32bcst | C | V/V | AVX512F | Compare Greater between int32 elements in zmm2 and zmm3/m512/m32bcst, and set destination k1 according to the comparison results under writemask. k2.
EVEX.128.66.0F.WIG 64 /r VPCMPGTB k1 {k2}, xmm2, xmm3/m128 | D | V/V | AVX512VL AVX512BW | Compare packed signed byte integers in xmm2 and xmm3/m128 for greater than, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.
EVEX.256.66.0F.WIG 64 /r VPCMPGTB k1 {k2}, ymm2, ymm3/m256 | D | V/V | AVX512VL AVX512BW | Compare packed signed byte integers in ymm2 and ymm3/m256 for greater than, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.
EVEX.512.66.0F.WIG 64 /r VPCMPGTB k1 {k2}, zmm2, zmm3/m512 | D | V/V | AVX512BW | Compare packed signed byte integers in zmm2 and zmm3/m512 for greater than, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.
EVEX.128.66.0F.WIG 65 /r VPCMPGTW k1 {k2}, xmm2, xmm3/m128 | D | V/V | AVX512VL AVX512BW | Compare packed signed word integers in xmm2 and xmm3/m128 for greater than, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.
EVEX.256.66.0F.WIG 65 /r VPCMPGTW k1 {k2}, ymm2, ymm3/m256 | D | V/V | AVX512VL AVX512BW | Compare packed signed word integers in ymm2 and ymm3/m256 for greater than, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.
EVEX.512.66.0F.WIG 65 /r VPCMPGTW k1 {k2}, zmm2, zmm3/m512 | D | V/V | AVX512BW | Compare packed signed word integers in zmm2 and zmm3/m512 for greater than, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.

> 1. See note in Section 2.5, “Intel® AVX and Intel® SSE Instruction Exception Classification,” in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 2A, and Section 23.25.3, “Exception Conditions of Legacy SIMD Instructions Operating on MMX Registers,” in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3B.

## Instruction Operand Encoding ¶

Op/En | Tuple Type | Operand 1 | Operand 2 | Operand 3 | Operand 4
--- | --- | --- | --- | --- | ---
A | N/A | ModRM:reg (r, w) | ModRM:r/m (r) | N/A | N/A
B | N/A | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | N/A
C | Full | ModRM:reg (w) | EVEX.vvvv (r) | ModRM:r/m (r) | N/A
D | Full Mem | ModRM:reg (w) | EVEX.vvvv (r) | ModRM:r/m (r) | N/A

## Description ¶

Performs an SIMD signed compare for the greater value of the packed byte, word, or doubleword integers in the destination operand (first operand) and the source operand (second operand). If a data element in the destination operand is greater than the corresponding date element in the source operand, the corresponding data element in the destination operand is set to all 1s; otherwise, it is set to all 0s.

The PCMPGTB instruction compares the corresponding signed byte integers in the destination and source operands; the PCMPGTW instruction compares the corresponding signed word integers in the destination and source operands; and the PCMPGTD instruction compares the corresponding signed doubleword integers in the destination and source operands.

In 64-bit mode and not encoded with VEX/EVEX, using a REX prefix in the form of REX.R permits this instruction to access additional registers (XMM8-XMM15).

Legacy SSE instructions: The source operand can be an MMX technology register or a 64-bit memory location. The destination operand can be an MMX technology register.

128-bit Legacy SSE version: The second source operand can be an XMM register or a 128-bit memory location. The first source operand and destination operand are XMM registers. Bits (MAXVL-1:128) of the corresponding YMM destination register remain unchanged.

VEX.128 encoded version: The second source operand can be an XMM register or a 128-bit memory location. The first source operand and destination operand are XMM registers. Bits (MAXVL-1:128) of the corresponding YMM register are zeroed.

VEX.256 encoded version: The first source operand is a YMM register. The second source operand is a YMM register or a 256-bit memory location. The destination operand is a YMM register.

EVEX encoded VPCMPGTD: The first source operand (second operand) is a ZMM/YMM/XMM register. The second source operand can be a ZMM/YMM/XMM register, a 512/256/128-bit memory location or a 512/256/128-bit vector broadcasted from a 32-bit memory location. The destination operand (first operand) is a mask register updated according to the writemask k2.

EVEX encoded VPCMPGTB/W: The first source operand (second operand) is a ZMM/YMM/XMM register. The second source operand can be a ZMM/YMM/XMM register, a 512/256/128-bit memory location. The destination operand (first operand) is a mask register updated according to the writemask k2.

## Operation ¶

### PCMPGTB (With 64-bit Operands) ¶

    IF DEST[7:0] > SRC[7:0]
        THEN DEST[7:0) := FFH;
        ELSE DEST[7:0] := 0; FI;
    (* Continue comparison of 2nd through 7th bytes in DEST and SRC *)
    IF DEST[63:56] > SRC[63:56]
        THEN DEST[63:56] := FFH;
        ELSE DEST[63:56] := 0; FI;

### COMPARE_BYTES_GREATER (SRC1, SRC2) ¶

        IF SRC1[7:0] > SRC2[7:0]
        THEN DEST[7:0] := FFH;
        ELSE DEST[7:0] := 0; FI;
    (* Continue comparison of 2nd through 15th bytes in SRC1 and SRC2 *)
        IF SRC1[127:120] > SRC2[127:120]
        THEN DEST[127:120] := FFH;
        ELSE DEST[127:120] := 0; FI;

### COMPARE_WORDS_GREATER (SRC1, SRC2) ¶

        IF SRC1[15:0] > SRC2[15:0]
        THEN DEST[15:0] := FFFFH;
        ELSE DEST[15:0] := 0; FI;
    (* Continue comparison of 2nd through 7th 16-bit words in SRC1 and SRC2 *)
        IF SRC1[127:112] > SRC2[127:112]
        THEN DEST[127:112] := FFFFH;
        ELSE DEST[127:112] := 0; FI;

### COMPARE_DWORDS_GREATER (SRC1, SRC2) ¶

        IF SRC1[31:0] > SRC2[31:0]
        THEN DEST[31:0] := FFFFFFFFH;
        ELSE DEST[31:0] := 0; FI;
    (* Continue comparison of 2nd through 3rd 32-bit dwords in SRC1 and SRC2 *)
        IF SRC1[127:96] > SRC2[127:96]
        THEN DEST[127:96] := FFFFFFFFH;
        ELSE DEST[127:96] := 0; FI;

### PCMPGTB (With 128-bit Operands) ¶

    DEST[127:0] := COMPARE_BYTES_GREATER(DEST[127:0],SRC[127:0])
    DEST[MAXVL-1:128] (Unmodified)

### VPCMPGTB (VEX.128 Encoded Version) ¶

    DEST[127:0] := COMPARE_BYTES_GREATER(SRC1,SRC2)
    DEST[MAXVL-1:128] := 0

### VPCMPGTB (VEX.256 Encoded Version) ¶

    DEST[127:0] := COMPARE_BYTES_GREATER(SRC1[127:0],SRC2[127:0])
    DEST[255:128] := COMPARE_BYTES_GREATER(SRC1[255:128],SRC2[255:128])
    DEST[MAXVL-1:256] := 0

### VPCMPGTB (EVEX Encoded Versions) ¶

    (KL, VL) = (16, 128), (32, 256), (64, 512)
    FOR j := 0 TO KL-1
        i := j * 8
        IF k2[j] OR *no writemask*
            THEN
                /* signed comparison */
                CMP := SRC1[i+7:i] > SRC2[i+7:i];
                IF CMP = TRUE
                    THEN DEST[j] := 1;
                    ELSE DEST[j] := 0; FI;
            ELSE DEST[j] := 0
                        ; zeroing-masking onlyFI;
        FI;
    ENDFOR
    DEST[MAX_KL-1:KL] := 0

### PCMPGTW (With 64-bit Operands) ¶

    IF DEST[15:0] > SRC[15:0]
        THEN DEST[15:0] := FFFFH;
        ELSE DEST[15:0] := 0; FI;
    (* Continue comparison of 2nd and 3rd words in DEST and SRC *)
    IF DEST[63:48] > SRC[63:48]
        THEN DEST[63:48] := FFFFH;
        ELSE DEST[63:48] := 0; FI;

### PCMPGTW (With 128-bit Operands) ¶

    DEST[127:0] := COMPARE_WORDS_GREATER(DEST[127:0],SRC[127:0])
    DEST[MAXVL-1:128] (Unmodified)

### VPCMPGTW (VEX.128 Encoded Version) ¶

    DEST[127:0] := COMPARE_WORDS_GREATER(SRC1,SRC2)
    DEST[MAXVL-1:128] := 0

### VPCMPGTW (VEX.256 Encoded Version) ¶

    DEST[127:0] := COMPARE_WORDS_GREATER(SRC1[127:0],SRC2[127:0])
    DEST[255:128] := COMPARE_WORDS_GREATER(SRC1[255:128],SRC2[255:128])
    DEST[MAXVL-1:256] := 0

### VPCMPGTW (EVEX Encoded Versions) ¶

    (KL, VL) = (8, 128), (16, 256), (32, 512)
    FOR j := 0 TO KL-1
        i := j * 16
        IF k2[j] OR *no writemask*
            THEN
                /* signed comparison */
                CMP := SRC1[i+15:i] > SRC2[i+15:i];
                IF CMP = TRUE
                    THEN DEST[j] := 1;
                    ELSE DEST[j] := 0; FI;
            ELSE DEST[j] := 0
                        ; zeroing-masking onlyFI;
        FI;
    ENDFOR
    DEST[MAX_KL-1:KL] := 0

### PCMPGTD (With 64-bit Operands) ¶

    IF DEST[31:0] > SRC[31:0]
        THEN DEST[31:0] := FFFFFFFFH;
        ELSE DEST[31:0] := 0; FI;
    IF DEST[63:32] > SRC[63:32]
        THEN DEST[63:32] := FFFFFFFFH;
        ELSE DEST[63:32] := 0; FI;

### PCMPGTD (With 128-bit Operands) ¶

    DEST[127:0] := COMPARE_DWORDS_GREATER(DEST[127:0],SRC[127:0])
    DEST[MAXVL-1:128] (Unmodified)

### VPCMPGTD (VEX.128 Encoded Version) ¶

    DEST[127:0] := COMPARE_DWORDS_GREATER(SRC1,SRC2)
    DEST[MAXVL-1:128] := 0

### VPCMPGTD (VEX.256 Encoded Version) ¶

    DEST[127:0] := COMPARE_DWORDS_GREATER(SRC1[127:0],SRC2[127:0])
    DEST[255:128] := COMPARE_DWORDS_GREATER(SRC1[255:128],SRC2[255:128])
    DEST[MAXVL-1:256] := 0

### VPCMPGTD (EVEX Encoded Versions) ¶

    (KL, VL) = (4, 128), (8, 256), (8, 512)
    FOR j := 0 TO KL-1
        i := j * 32
        IF k2[j] OR *no writemask*
                    THEN
                        /* signed comparison */
                        IF (EVEX.b = 1) AND (SRC2 *is memory*)
                            THEN CMP := SRC1[i+31:i] > SRC2[31:0];
                            ELSE CMP := SRC1[i+31:i] > SRC2[i+31:i];
                        FI;
                        IF CMP = TRUE
                            THEN DEST[j] := 1;
                            ELSE DEST[j] := 0; FI;
                    ELSE
                            DEST[j] := 0
                                ; zeroing-masking only
            I
                ;
    ENDFOR
    DEST[MAX_KL-1:KL] := 0

## Intel C/C++ Compiler Intrinsic Equivalents ¶

    VPCMPGTB __mmask64 _mm512_cmpgt_epi8_mask(__m512i a, __m512i b);

    VPCMPGTB __mmask64 _mm512_mask_cmpgt_epi8_mask(__mmask64 k, __m512i a, __m512i b);

    VPCMPGTB __mmask32 _mm256_cmpgt_epi8_mask(__m256i a, __m256i b);

    VPCMPGTB __mmask32 _mm256_mask_cmpgt_epi8_mask(__mmask32 k, __m256i a, __m256i b);

    VPCMPGTB __mmask16 _mm_cmpgt_epi8_mask(__m128i a, __m128i b);

    VPCMPGTB __mmask16 _mm_mask_cmpgt_epi8_mask(__mmask16 k, __m128i a, __m128i b);

    VPCMPGTD __mmask16 _mm512_cmpgt_epi32_mask(__m512i a, __m512i b);

    VPCMPGTD __mmask16 _mm512_mask_cmpgt_epi32_mask(__mmask16 k, __m512i a, __m512i b);

    VPCMPGTD __mmask8 _mm256_cmpgt_epi32_mask(__m256i a, __m256i b);

    VPCMPGTD __mmask8 _mm256_mask_cmpgt_epi32_mask(__mmask8 k, __m256i a, __m256i b);

    VPCMPGTD __mmask8 _mm_cmpgt_epi32_mask(__m128i a, __m128i b);

    VPCMPGTD __mmask8 _mm_mask_cmpgt_epi32_mask(__mmask8 k, __m128i a, __m128i b);

    VPCMPGTW __mmask32 _mm512_cmpgt_epi16_mask(__m512i a, __m512i b);

    VPCMPGTW __mmask32 _mm512_mask_cmpgt_epi16_mask(__mmask32 k, __m512i a, __m512i b);

    VPCMPGTW __mmask16 _mm256_cmpgt_epi16_mask(__m256i a, __m256i b);

    VPCMPGTW __mmask16 _mm256_mask_cmpgt_epi16_mask(__mmask16 k, __m256i a, __m256i b);

    VPCMPGTW __mmask8 _mm_cmpgt_epi16_mask(__m128i a, __m128i b);

    VPCMPGTW __mmask8 _mm_mask_cmpgt_epi16_mask(__mmask8 k, __m128i a, __m128i b);

    PCMPGTB __m64 _mm_cmpgt_pi8 (__m64 m1, __m64 m2)

    PCMPGTW __m64 _mm_cmpgt_pi16 (__m64 m1, __m64 m2)

    PCMPGTD __m64 _mm_cmpgt_pi32 (__m64 m1, __m64 m2)

    (V)PCMPGTB __m128i _mm_cmpgt_epi8 ( __m128i a, __m128i b)

    (V)PCMPGTW __m128i _mm_cmpgt_epi16 ( __m128i a, __m128i b)

    (V)DCMPGTD __m128i _mm_cmpgt_epi32 ( __m128i a, __m128i b)

    VPCMPGTB __m256i _mm256_cmpgt_epi8 ( __m256i a, __m256i b)

    VPCMPGTW __m256i _mm256_cmpgt_epi16 ( __m256i a, __m256i b)

    VPCMPGTD __m256i _mm256_cmpgt_epi32 ( __m256i a, __m256i b)

## Flags Affected ¶

None.

## Numeric Exceptions ¶

None.

## Other Exceptions ¶

Non-EVEX-encoded instruction, see Table 2-21, “Type 4 Class Exception Conditions.”

EVEX-encoded VPCMPGTD, see Table 2-49, “Type E4 Class Exception Conditions.”

EVEX-encoded VPCMPGTB/W, see Exceptions Type E4.nb in Table 2-49, “Type E4 Class Exception Conditions.”