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Henk-Jan Lebbink edited this page Jun 5, 2018 · 12 revisions

CVTSD2SI — Convert Scalar Double-Precision Floating-Point Value to Doubleword Integer

Opcode/ Instruction Op / En 64/32 bit Mode Support CPUID Feature Flag Description
F2 0F 2D /r CVTSD2SI r32, xmm1/m64 A V/V SSE2 Convert one double-precision floating-point value from xmm1/m64 to one signed doubleword integer r32.
F2 REX.W 0F 2D /r CVTSD2SI r64, xmm1/m64 A V/N.E. SSE2 Convert one double-precision floating-point value from xmm1/m64 to one signed quadword integer sign- extended into r64.
VEX.LIG.F2.0F.W0 2D /r 1 VCVTSD2SI r32, xmm1/m64 A V/V AVX Convert one double-precision floating-point value from xmm1/m64 to one signed doubleword integer r32.
VEX.LIG.F2.0F.W1 2D /r 1 VCVTSD2SI r64, xmm1/m64 A V/N.E.2 AVX Convert one double-precision floating-point value from xmm1/m64 to one signed quadword integer sign- extended into r64.
EVEX.LIG.F2.0F.W0 2D /r VCVTSD2SI r32, xmm1/m64{er} B V/V AVX512F Convert one double-precision floating-point value from xmm1/m64 to one signed doubleword integer r32.
EVEX.LIG.F2.0F.W1 2D /r VCVTSD2SI r64, xmm1/m64{er} B V/N.E.2 AVX512F Convert one double-precision floating-point value from xmm1/m64 to one signed quadword integer sign- extended into r64.

NOTES:

  1. Software should ensure VCVTSD2SI is encoded with VEX.L=0. Encoding VCVTSD2SI with VEX.L=1 may encounter unpredictable behavior across different processor generations.
  2. VEX.W1/EVEX.W1 in non-64 bit is ignored; the instructions behaves as if the W0 version is used.

Instruction Operand Encoding

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

Description

Converts a double-precision floating-point value in the source operand (the second operand) to a signed double- word integer in the destination operand (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.

If a converted result exceeds the range limits of signed doubleword integer (in non-64-bit modes or 64-bit mode with REX.W/VEX.W/EVEX.W=0), the floating-point invalid exception is raised, and if this exception is masked, the indefinite integer value (80000000H) is returned.

If a converted result exceeds the range limits of signed quadword integer (in 64-bit mode and REX.W/VEX.W/EVEX.W = 1), the floating-point invalid exception is raised, and if this exception is masked, the indefinite integer value (80000000_00000000H) is returned.

Legacy SSE instruction: Use of the REX.W prefix promotes the instruction to produce 64-bit data in 64-bit mode. See the summary chart at the beginning of this section for encoding data and limits.

Note: VEX.vvvv and EVEX.vvvv are reserved and must be 1111b, otherwise instructions will #UD.

Software should ensure VCVTSD2SI is encoded with VEX.L=0. Encoding VCVTSD2SI with VEX.L=1 may encounter unpredictable behavior across different processor generations.

Operation

VCVTSD2SI (EVEX encoded version)

IF SRC *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[63:0] ← Convert_Double_Precision_Floating_Point_To_Integer(SRC[63:0]);
    ELSE
            DEST[31:0] ← Convert_Double_Precision_Floating_Point_To_Integer(SRC[63:0]);
FI

(V)CVTSD2SI

IF 64-Bit Mode and OperandSize = 64
THEN
    DEST[63:0] ←Convert_Double_Precision_Floating_Point_To_Integer(SRC[63:0]);
ELSE
    DEST[31:0] ←Convert_Double_Precision_Floating_Point_To_Integer(SRC[63:0]);
FI;

Intel C/C++ Compiler Intrinsic Equivalent

VCVTSD2SI int _mm_cvtsd_i32(__m128d);
VCVTSD2SI int _mm_cvt_roundsd_i32(__m128d, int r);
VCVTSD2SI __int64 _mm_cvtsd_i64(__m128d);
VCVTSD2SI __int64 _mm_cvt_roundsd_i64(__m128d, int r);
CVTSD2SI __int64 _mm_cvtsd_si64(__m128d);
CVTSD2SI int _mm_cvtsd_si32(__m128d a)

SIMD Floating-Point Exceptions

Invalid, Precision

Other Exceptions

VEX-encoded instructions, see Exceptions Type 3;

EVEX-encoded instructions, see Exceptions Type E3NF.

#UD If VEX.vvvv != 1111B or EVEX.vvvv != 1111B.

Source: Intel® Architecture Software Developer's Manual (May 2018)
Generated: 5-6-2018

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