CVTDQ2PD (Convert Packed Dword Integers to Packed Double-Precision FP Values)

Opcodes

Opcode/Instruction Op/En 64/32-bit Mode CPUID Feature Flag Description
F3 0F E6 CVTDQ2PD xmm1, xmm2/m64 RM V/V SSE2 Convert two packed signed doubleword integers from xmm2/m128 to two packed double-precision floating-point values in xmm1.
VEX.128.F3.0F.WIG E6 /r VCVTDQ2PD xmm1, xmm2/m64 RM V/V AVX Convert two packed signed doubleword integers from xmm2/mem to two packed double-precision floating-point values in xmm1.
VEX.256.F3.0F.WIG E6 /r VCVTDQ2PD ymm1, xmm2/m128 RM V/V AVX Convert four packed signed doubleword integers from xmm2/mem to four packed double-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 two packed signed doubleword integers in the source operand (second operand) to two packed double-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 64- 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 64- 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 128- 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.

X3

X2

X1

X0

SRC

X3

X2

X1

X0

DEST

Figure 3-10. CVTDQ2PD (VEX.256 encoded version)

Operation

CVTDQ2PD (128-bit Legacy SSE version)

DEST[63:0] ← Convert_Integer_To_Double_Precision_Floating_Point(SRC[31:0])
DEST[127:64] ← Convert_Integer_To_Double_Precision_Floating_Point(SRC[63:32])
DEST[VLMAX-1:128] (unmodified)

VCVTDQ2PD (VEX.128 encoded version)

DEST[63:0] ← Convert_Integer_To_Double_Precision_Floating_Point(SRC[31:0])
DEST[127:64] ← Convert_Integer_To_Double_Precision_Floating_Point(SRC[63:32])
DEST[VLMAX-1:128] ← 0

VCVTDQ2PD (VEX.256 encoded version)

DEST[63:0] ← Convert_Integer_To_Double_Precision_Floating_Point(SRC[31:0])
DEST[127:64] ← Convert_Integer_To_Double_Precision_Floating_Point(SRC[63:32])
DEST[191:128] ← Convert_Integer_To_Double_Precision_Floating_Point(SRC[95:64])
DEST[255:192] ← Convert_Integer_To_Double_Precision_Floating_Point(SRC[127:96)

Intel C/C++ Compiler Intrinsic Equivalent

CVTDQ2PD:

__m128d _mm_cvtepi32_pd(__m128i a)

VCVTDQ2PD:

__m256d _mm256_cvtepi32_pd (__m128i src)

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Exceptions Type 5; additionally

#UD If VEX.vvvv ≠ 1111B.