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VCVTUSI2SS—Convert Unsigned Integer to Scalar Single-Precision Floating-Point Value

Opcode/Instruction Op /En 64/32 bit Mode Support CPUID Feature Flag Description

EVEX.NDS.LIG.F3.0F.W0 7B /r

VCVTUSI2SS xmm1, xmm2, r/m32{er}

 T1S V/V AVX512F Convert one signed doubleword integer from r/m32 to one single-precision floating-point value in xmm1.

EVEX.NDS.LIG.F3.0F.W1 7B /r

VCVTUSI2SS xmm1, xmm2, r/m64{er}

 T1S V/N.E.1 AVX512F Convert one signed quadword integer from r/m64 to one single-precision floating-point value in xmm1.

NOTES: 1. For this specific instruction, EVEX.W in non-64 bit is ignored; the instructions behaves as if the W0 version is

used.

Instruction Operand Encoding

Op/En Operand 1 Operand 2 Operand 3 Operand 4
T1S ModRM:reg (w) VEX.vvvv ModRM:r/m (r) NA

Description

Converts a unsigned doubleword integer (or unsigned quadword integer if operand size is 64 bits) in the source operand (second operand) to a single-precision floating-point value in the destination operand (first operand). The source operand can be a general-purpose register or a memory location. The destination operand is an XMM register. The result is stored in the low doubleword of the destination operand. 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.

The second source operand can be a general-purpose register or a 32/64-bit memory location. The first source and destination operands are XMM registers. Bits (127:32) of the XMM register destination are copied from corre-sponding bits in the first source operand. Bits (MAX_VL-1:128) of the destination register are zeroed.

EVEX.W1 version: promotes the instruction to use 64-bit input value in 64-bit mode.

Operation


VCVTUSI2SS (EVEX encoded version)

IF (SRC2 *is register*) AND (EVEX.b = 1)
    THEN
    SET_RM(EVEX.RC);
    ELSE
    SET_RM(MXCSR.RM);
FI;
IF 64-Bit Mode And OperandSize = 64
    THEN
    DEST[31:0] (cid:197) Convert_UInteger_To_Single_Precision_Floating_Point(SRC[63:0]);
    ELSE
    DEST[31:0] (cid:197) Convert_UInteger_To_Single_Precision_Floating_Point(SRC[31:0]);
FI;
DEST[127:32] (cid:197) SRC1[127:32]
DEST[MAX_VL-1:128] (cid:197) 0



Intel C/C++ Compiler Intrinsic Equivalent


VCVTUSI2SS __m128 _mm_cvtu32_ss( __m128 s, unsigned a);
VCVTUSI2SS __m128 _mm_cvt_roundu32_ss( __m128 s, unsigned a, int r);
VCVTUSI2SS __m128 _mm_cvtu64_ss( __m128 s, unsigned __int64 a);
VCVTUSI2SS __m128 _mm_cvt_roundu64_ss( __m128 s, unsigned __int64 a, int r);



SIMD Floating-Point Exceptions


Precision


Other Exceptions


See Exceptions Type E3NF.