PINSRB/PINSRD/PINSRQ — Insert Byte/Dword/Qword

Opcode/Instruction	Op/En	64/32 bit Mode Support	CPUID Feature Flag	Description
66 0F 3A 20 /r ib PINSRB xmm1, r32/m8, imm8	RMI	V/V	SSE4_1	Insert a byte integer value from r32/m8 into xmm1 at the destination element in xmm1 specified by imm8.
66 0F 3A 22 /r ib PINSRD xmm1, r/m32, imm8	RMI	V/V	SSE4_1	Insert a dword integer value from r/m32 into the xmm1 at the destination element specified by imm8.
66 REX.W 0F 3A 22 /r ib PINSRQ xmm1, r/m64, imm8	RMI	V/N. E.	SSE4_1	Insert a qword integer value from r/m64 into the xmm1 at the destination element specified by imm8.
VEX.NDS.128.66.0F3A.W0 20 /r ib VPINSRB xmm1, xmm2, r32/m8, imm8	RVMI	V¹/V	AVX	Merge a byte integer value from r32/m8 and rest from xmm2 into xmm1 at the byte offset in imm8.
VEX.NDS.128.66.0F3A.W0 22 /r ib VPINSRD xmm1, xmm2, r/m32, imm8	RVMI	V/V	AVX	Insert a dword integer value from r32/m32 and rest from xmm2 into xmm1 at the dword offset in imm8.
VEX.NDS.128.66.0F3A.W1 22 /r ib VPINSRQ xmm1, xmm2, r/m64, imm8	RVMI	V/I	AVX	Insert a qword integer value from r64/m64 and rest from xmm2 into xmm1 at the qword offset in imm8.

Notes: 1. In 64-bit mode, VEX.W1 is ignored for VPINSRB (similar to legacy REX.W=1 prefix with PINSRB).

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
RMI	ModRM:reg (w)	ModRM:r/m (r)	imm8	NA
RVMI	ModRM:reg (w)	VEX.vvvv (r)	ModRM:r/m (r)	imm8

Description

Copies a byte/dword/qword from the source operand (second operand) and inserts it in the destination operand (first operand) at the location specified with the count operand (third operand). (The other elements in the destination register are left untouched.) The source operand can be a general-purpose register or a memory location. (When the source operand is a general-purpose register, PINSRB copies the low byte of the register.) The destination operand is an XMM register. The count operand is an 8-bit immediate. When specifying a qword[dword, byte]location in an an XMM register, the [2, 4] least-significant bit(s) of the count operand specify the location. In 64-bit mode, using a REX prefix in the form of REX.R permits this instruction to access additional registers (XMM8-XMM15, R8-15). Use of REX.W permits the use of 64 bit general purpose registers. 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.L must be 0, otherwise the instruction will #UD. Attempt to execute VPINSRQ in non-64-bit mode will cause #UD.

Operation

CASE OF
  PINSRB: SEL ← COUNT[3:0];
       MASK ← (0FFH << (SEL * 8));
       TEMP ← (((SRC[7:0] << (SEL *8)) AND MASK);
  PINSRD: SEL ← COUNT[1:0];
       MASK ← (0FFFFFFFFH << (SEL * 32));
       TEMP ← (((SRC << (SEL *32)) AND MASK)
  PINSRQ: SEL ← COUNT[0]
       MASK ← (0FFFFFFFFFFFFFFFFH << (SEL * 64));
       TEMP ← (((SRC << (SEL *32)) AND MASK)
ESAC;
     DEST ← ((DEST AND NOT MASK) OR TEMP);
VPINSRB (VEX.128 encoded version)
SEL ← imm8[3:0]
DEST[127:0] ← write_b_element(SEL, SRC2, SRC1)
DEST[VLMAX-1:128] ← 0
VPINSRD (VEX.128 encoded version)
SEL ← imm8[1:0]
DEST[127:0] ← write_d_element(SEL, SRC2, SRC1)
DEST[VLMAX-1:128] ← 0
VPINSRQ (VEX.128 encoded version)
SEL ← imm8[0]
DEST[127:0] ← write_q_element(SEL, SRC2, SRC1)
DEST[VLMAX-1:128] ← 0

Intel C/C++ Compiler Intrinsic Equivalent

PINSRB:	__m128i _mm_insert_epi8 (__m128i s1, int s2, const int ndx);
PINSRD:	__m128i _mm_insert_epi32 (__m128i s2, int s, const int ndx);
PINSRQ:	__m128i _mm_insert_epi64(__m128i s2, __int64 s, const int ndx);

Flags Affected

None.

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Exceptions Type 5; additionally

#UD	If VEX.L = 1. If VPINSRQ in non-64-bit mode with VEX.W=1.