Value Conversion Operations and Corresponding instruction

Conversion Operations

Visual Studio .NET 2003

Microsoft Specific

The conversions operations are listed in the Conversion Operations table followed by a description of each intrinsic with the most recent mnemonic naming convention. The alternate name is provided if you have used these intrinsics before.

Conversion Operations

Intrinsic name	Corresponding instruction
_mm_cvtss_si32	CVTSS2SI
_mm_cvtps_pi32	CVTPS2PI
_mm_cvttss_si32	CVTTSS2SI
_mm_cvttps_pi32	CVTTPS2PI
_mm_cvtsi32_ss	CVTSI2SS
_mm_cvtpi32_ps	CVTTPS2PI
_mm_cvtpi16_ps	Composite
_mm_cvtpu16_ps	Composite
_mm_cvtpi8_ps	Composite
_mm_cvtpu8_ps	Composite
_mm_cvtpi32x2_ps	Composite
_mm_cvtps_pi16	Composite
_mm_cvtps_pi8	Composite

For an explanation of the syntax used in code samples in this topic, see Floating-Point Intrinsics Using Streaming SIMD Extensions.
int _mm_cvtss_si32(__m128 a );

CVTSS2SI

Converts the lower single-precision, floating-point value of a to a 32-bit integer according to the current rounding mode.

r := (int)a0

__m64 _mm_cvtps_pi32(__m128 a );

CVTPS2PI

Converts the two lower single-precision, floating-point values of a to two 32-bit integers according to the current rounding mode, returning the integers in packed form.

r0 := (int)a0
r1 := (int)a1

int _mm_cvttss_si32(__m128 a );

CVTTSS2SI

Converts the lower single-precision, floating-point value of a to a 32-bit integer with truncation.

r := (int)a0

__m64 _mm_cvttps_pi32(__m128 a );

CVTTPS2PI

Converts the two lower single-precision, floating-point values of a to two 32-bit integer with truncation, returning the integers in packed form.

r0 := (int)a0
r1 := (int)a1

__m128 _mm_cvtsi32_ss(__m128 a , int b );

CVTSI2SS

Converts the 32-bit integer value b to an single-precision, floating-point value; the upper three single-precision, floating-point values are passed through from a.

r0 := (float)b
r1 := a1 ; r2 := a2 ; r3 := a3

__m128 _mm_cvtpi32_ps(__m128 a , __m64 b );

CVTPI2PS

Converts the two 32-bit integer values in packed form in b to two single-precision, floating-point values; the upper two single-precision, floating-point values are passed through from a.

r0 := (float)b0
r1 := (float)b1
r2 := a2
r3 := a3

__m128 _mm_cvtpi16_ps(__m64 a );

(composite)

Converts the four 16-bit signed integer values in a to four single-precision, floating-point values.

r0 := (float)a0
r1 := (float)a1
r2 := (float)a2
r3 := (float)a3

__m128 _mm_cvtpu16_ps(__m64 a );

(composite)

Converts the four 16-bit unsigned integer values in a to four single-precision, floating-point values.

r0 := (float)a0
r1 := (float)a1
r2 := (float)a2
r3 := (float)a3

__m128 _mm_cvtpi8_ps(__m64 a );

(composite)

Converts the lower four 8-bit signed integer values in a to four single-precision, floating-point values.

r0 := (float)a0
r1 := (float)a1
r2 := (float)a2
r3 := (float)a3

__m128 _mm_cvtpu8_ps(__m64 a );

(composite)

Converts the lower four 8-bit unsigned integer values in a to four single-precision, floating-point values.

r0 := (float)a0
r1 := (float)a1
r2 := (float)a2
r3 := (float)a3

__m128 _mm_cvtpi32x2_ps(__m64 a, __m64 b );

(composite)

Converts the two 32-bit signed integer values in a and the two 32-bit signed integer values in b to four single-precision, floating-point values.

r0 := (float)a0
r1 := (float)a1
r2 := (float)b0
r3 := (float)b1

__m64 _mm_cvtps_pi16( __m128 a );

(composite)

Converts the four single-precision, floating-point values in a to four signed 16-bit integer values.

r0 := (short)a0
r1 := (short)a1
r2 := (short)a2
r3 := (short)a3

__m64 _mm_cvtps_pi8( __m128 a );

(composite)

Converts the four single-precision, floating-point values in a to the lower four signed 8-bit integer values of the result.

r0 := (char)a0
r1 := (char)a1
r2 := (char)a2
r3 := (char)a3 

END Microsoft Specific