INSERTPS (Insert Packed Single Precision Floating-Point Value)

Opcodes

Opcode/Instruction Op/En 64/32-bit Mode CPUID Feature Flag Description
66 0F 3A 21 /r ib INSERTPS xmm1, xmm2/m32, imm8 RMI V/V SSE4_1 Insert a single precision floating-point value selected by imm8 from xmm2/m32 into xmm1 at the specified destination element specified by imm8 and zero out destination elements in xmm1 as indicated in imm8.
VEX.NDS.128.66.0F3A.WIG 21 /r ib VINSERTPS xmm1, xmm2, xmm3/m32, imm8 RVMI V/V AVX Insert a single precision floating point value selected by imm8 from xmm3/m32 and merge into xmm2 at the specified destination element specified by imm8 and zero out destination elements in xmm1 as indicated in imm8.

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

(register source form)

Select a single precision floating-point element from second source as indicated by Count_S bits of the immediate operand and insert it into the first source at the location indicated by the Count_D bits of the immediate operand. Store in the destination and zero out destination elements based on the ZMask bits of the immediate operand.

(memory source form)

Load a floating-point element from a 32-bit memory location and insert it into the first source at the location indi-cated by the Count_D bits of the immediate operand. Store in the destination and zero out destination elements based on the ZMask bits of the immediate operand.

128-bit Legacy SSE version: The first source register is an XMM register. The second source operand is either an XMM register or a 32-bit memory location. The destination is not distinct from the first source XMM register and the upper bits (VLMAX-1:128) of the corresponding YMM register destination are unmodified.

VEX.128 encoded version. The destination and first source register is an XMM register. The second source operand is either an XMM register or a 32-bit memory location. The upper bits (VLMAX-1:128) of the corresponding YMM register destination are zeroed.

If VINSERTPS is encoded with VEX.L= 1, an attempt to execute the instruction encoded with VEX.L= 1 will cause an #UD exception.

Operation

INSERTPS (128-bit Legacy SSE version)

IF (SRC = REG) THEN COUNT_S ← imm8[7:6]
    ELSE COUNT_S ← 0
COUNT_D ← imm8[5:4]
ZMASK ← imm8[3:0]
CASE (COUNT_S) OF
    0: TMP ← SRC[31:0]
    1: TMP ← SRC[63:32]
    2: TMP ← SRC[95:64]
    3: TMP ← SRC[127:96]
ESAC;
CASE (COUNT_D) OF
    0: TMP2[31:0] ← TMP
         TMP2[127:32] ← DEST[127:32]
    1: TMP2[63:32] ← TMP
         TMP2[31:0] ← DEST[31:0]
         TMP2[127:64] ← DEST[127:64]
    2: TMP2[95:64] ← TMP
         TMP2[63:0] ← DEST[63:0]
         TMP2[127:96] ← DEST[127:96]
    3: TMP2[127:96] ← TMP
         TMP2[95:0] ← DEST[95:0]
ESAC;
IF (ZMASK[0] = 1) THEN DEST[31:0] ← 00000000H
    ELSE DEST[31:0] ← TMP2[31:0]
IF (ZMASK[1] = 1) THEN DEST[63:32] ← 00000000H
    ELSE DEST[63:32] ← TMP2[63:32]
IF (ZMASK[2] = 1) THEN DEST[95:64] ← 00000000H
    ELSE DEST[95:64] ← TMP2[95:64]
IF (ZMASK[3] = 1) THEN DEST[127:96] ← 00000000H
    ELSE DEST[127:96] ← TMP2[127:96]
DEST[VLMAX-1:128] (Unmodified)

VINSERTPS (VEX.128 encoded version)

IF (SRC = REG) THEN COUNT_S ← imm8[7:6]
    ELSE COUNT_S ← 0
COUNT_D ← imm8[5:4]
ZMASK ← imm8[3:0]
CASE (COUNT_S) OF
    0: TMP ← SRC2[31:0]
    1: TMP ← SRC2[63:32]
    2: TMP ← SRC2[95:64]
    3: TMP ← SRC2[127:96]
ESAC;
CASE (COUNT_D) OF
    0: TMP2[31:0] ← TMP
         TMP2[127:32] ← SRC1[127:32]
    1: TMP2[63:32] ← TMP
         TMP2[31:0] ← SRC1[31:0]
         TMP2[127:64] ← SRC1[127:64]
    2: TMP2[95:64] ← TMP
         TMP2[63:0] ← SRC1[63:0]
         TMP2[127:96] ← SRC1[127:96]
    3: TMP2[127:96] ← TMP
         TMP2[95:0] ← SRC1[95:0]
ESAC;
IF (ZMASK[0] = 1) THEN DEST[31:0] ← 00000000H
    ELSE DEST[31:0] ← TMP2[31:0]
IF (ZMASK[1] = 1) THEN DEST[63:32] ← 00000000H
    ELSE DEST[63:32] ← TMP2[63:32]
IF (ZMASK[2] = 1) THEN DEST[95:64] ← 00000000H
    ELSE DEST[95:64] ← TMP2[95:64]
IF (ZMASK[3] = 1) THEN DEST[127:96] ← 00000000H
    ELSE DEST[127:96] ← TMP2[127:96]
DEST[VLMAX-1:128] ← 0

Intel C/C++ Compiler Intrinsic Equivalent

INSERTPS:

__m128 _mm_insert_ps(__m128 dst, __m128 src, const int ndx);

SIMD Floating-Point Exceptions

None

Other Exceptions

See Exceptions Type 5.