VCVTSD2USI—Convert Scalar Double Precision Floating-Point Value to Unsigned Doubleword Integer

Opcode/Instruction	Op /En	64/32 bit Mode Support	CPUID Feature Flag	Description
EVEX.LLIG.F2.0F.W0 79 /r VCVTSD2USI r32, xmm1/m64{er}	A	V/V	AVX512F	Convert one double precision floating-point value from xmm1/m64 to one unsigned doubleword integer r32.
EVEX.LLIG.F2.0F.W1 79 /r VCVTSD2USI r64, xmm1/m64{er}	A	V/N.E.¹	AVX512F	Convert one double precision floating-point value from xmm1/m64 to one unsigned quadword integer zero-extended into r64.

NOTES:

1. EVEX.W1 in non-64 bit is ignored; the instruction behaves as if the W0 version is used.

Instruction Operand Encoding

Op/En	Tuple Type	Operand 1	Operand 2	Operand 3	Operand 4
A	Tuple1 Fixed	ModRM:reg (w)	ModRM:r/m (r)	N/A	N/A

Description

Converts a double precision floating-point value in the source operand (the second operand) to an unsigned doubleword integer in the destination operand (the first operand). The source operand can be an XMM register or a 64-bit memory location. The destination operand is a general-purpose register. When the source operand is an XMM register, the double precision floating-point value is contained in the low quadword of the register.

When a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR register or the embedded rounding control bits. If a converted result cannot be represented in the destination format, the floating-point invalid exception is raised, and if this exception is masked, the integer value 2^w – 1 is returned, where w represents the number of bits in the destination format.

Operation

VCVTSD2USI (EVEX Encoded Version)

IF (SRC *is register*) AND (EVEX.b = 1)

THEN

SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(EVEX.RC);

ELSE

SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(MXCSR.RC);

FI;

IF 64-Bit Mode and OperandSize = 64

THEN

DEST[63:0] := Convert_Double_Precision_Floating_Point_To_UInteger(SRC[63:0]);

ELSE

DEST[31:0] := Convert_Double_Precision_Floating_Point_To_UInteger(SRC[63:0]);

Intel C/C++ Compiler Intrinsic Equivalent

VCVTSD2USI unsigned int _mm_cvtsd_u32(__m128d);

VCVTSD2USI unsigned int _mm_cvt_roundsd_u32(__m128d, int r);

VCVTSD2USI unsigned __int64 _mm_cvtsd_u64(__m128d);

VCVTSD2USI unsigned __int64 _mm_cvt_roundsd_u64(__m128d, int r);

SIMD Floating-Point Exceptions

Invalid, Precision.

Other Exceptions

EVEX-encoded instructions, see Table 2-48, “Type E3NF Class Exception Conditions.”