CVTDQ2PS—Convert Packed Dword Integers to Packed Single-Precision FP Values

Opcode/Instruction	Op/En	64/32-bit Mode	CPUID Feature Flag	Description
0F 5B /r CVTDQ2PS xmm1, xmm2/m128	RM	V/V	SSE2	Convert four packed signed doubleword integers from xmm2/m128 to four packed single-precision floating-point values in xmm1.
VEX.128.0F.WIG 5B /r VCVTDQ2PS xmm1, xmm2/m128	RM	V/V	AVX	Convert four packed signed doubleword integers from xmm2/mem to four packed single-precision floating-point values in xmm1.
VEX.256.0F.WIG 5B /r VCVTDQ2PS ymm1, ymm2/m256	RM	V/V	AVX	Convert eight packed signed doubleword integers from ymm2/mem to eight packed single-precision floating-point values in ymm1.

Opcode/Instruction

Op/En

64/32-bit Mode

CPUID Feature Flag

Description

0F 5B /r

CVTDQ2PS xmm1, xmm2/m128

V/V

SSE2

Convert four packed signed doubleword integers from xmm2/m128 to four packed single-precision floating-point values in xmm1.

VEX.128.0F.WIG 5B /r

VCVTDQ2PS xmm1, xmm2/m128

V/V

AVX

Convert four packed signed doubleword integers from xmm2/mem to four packed single-precision floating-point values in xmm1.

VEX.256.0F.WIG 5B /r

VCVTDQ2PS ymm1, ymm2/m256

V/V

AVX

Convert eight packed signed doubleword integers from ymm2/mem to eight packed single-precision floating-point values in ymm1.

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
RM	ModRM:reg (w)	ModRM:r/m (r)	NA	NA

Description

Converts four packed signed doubleword integers in the source operand (second operand) to four packed single-precision floating-point values in the destination operand (first operand).

In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15).

128-bit Legacy SSE version: The source operand is an XMM register or 128- bit memory location. The destination operation is an XMM register. The upper bits (VLMAX-1:128) of the corresponding XMM register destination are unmodified.

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

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

Note: In VEX-encoded versions, VEX.vvvv is reserved and must be 1111b, otherwise instructions will #UD.

Operation

CVTDQ2PS (128-bit Legacy SSE version)

DEST[31:0] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[31:0])
DEST[63:32] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[63:32])
DEST[95:64] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[95:64])
DEST[127:96] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[127z:96)
DEST[VLMAX-1:128] (unmodified)

VCVTDQ2PS (VEX.128 encoded version)

DEST[31:0] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[31:0])
DEST[63:32] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[63:32])
DEST[95:64] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[95:64])
DEST[127:96] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[127z:96)
DEST[VLMAX-1:128] ← 0

VCVTDQ2PS (VEX.256 encoded version)

DEST[31:0] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[31:0])
DEST[63:32] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[63:32])
DEST[95:64] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[95:64])
DEST[127:96] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[127z:96)
DEST[159:128] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[159:128])
DEST[191:160] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[191:160])
DEST[223:192] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[223:192])
DEST[255:224] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[255:224)

Intel C/C++ Compiler Intrinsic Equivalent

CVTDQ2PS:

__m128 _mm_cvtepi32_ps(__m128i a)

VCVTDQ2PS:

__m256 _mm256_cvtepi32_ps (__m256i src)

SIMD Floating-Point Exceptions

Precision.

Other Exceptions

See Exceptions Type 2; additionally

#UD	If VEX.vvvv ≠ 1111B.