Opcode/Instruction | Op /En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
---|---|---|---|---|
F3 0F 2D /r CVTSS2SI r32, xmm1/m32 | RM | V/V | SSE | Convert one single-precision floating-point value from xmm1/m32 to one signed doubleword integer in r32. |
F3 REX.W 0F 2D /r CVTSS2SI r64, xmm1/m32 | RM | V/N.E. | SSE | Convert one single-precision floating-point value from xmm1/m32 to one signed quadword integer in r64. |
VEX.128.F3.0F.W0 2D /r VCVTSS2SI r32, xmm1/m32 | RM | V/V | AVX | Convert one single-precision floating-point value from xmm1/m32 to one signed doubleword integer in r32. |
VEX.128.F3.0F.W1 2D /r VCVTSS2SI r64, xmm1/m32 | RM | V/N.E.1 | AVX | Convert one single-precision floating-point value from xmm1/m32 to one signed quadword integer in r64. |
EVEX.LIG.F3.0F.W0 2D /r VCVTSS2SI r32, xmm1/m32{er} | T1F | V/V | AVX512F | Convert one single-precision floating-point value from xmm1/m32 to one signed doubleword integer in r32. |
EVEX.LIG.F3.0F.W1 2D /r VCVTSS2SI r64, xmm1/m32{er} | T1F | V/N.E.1 | AVX512F | Convert one single-precision floating-point value from xmm1/m32 to one signed quadword integer in r64. |
NOTES: 1. VEX.W1/EVEX.W1 in non-64 bit is ignored; the instructions behaves as if the W0 version is used.
Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
RM | ModRM:reg (w) | ModRM:r/m (r) | NA | NA |
T1F | ModRM:reg (w) | ModRM:r/m (r) | NA | NA |
Converts a single-precision floating-point value in the source operand (the second operand) to a signed doubleword integer (or signed quadword integer if operand size is 64 bits) in the destination operand (the first operand). The source operand can be an XMM register or a memory location. The destination operand is a general-purpose register. When the source operand is an XMM register, the single-precision floating-point value is contained in the low doubleword 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 indefinite integer value (2w-1, where w represents the number of bits in the destination format) is returned.
Legacy SSE instructions: In 64-bit mode, Use of the REX.W prefix promotes the instruction to produce 64-bit data. See the summary chart at the beginning of this section for encoding data and limits.
VEX.W1 and EVEX.W1 versions: promotes the instruction to produce 64-bit data in 64-bit mode.
Note: VEX.vvvv and EVEX.vvvv are reserved and must be 1111b, otherwise instructions will #UD.
Software should ensure VCVTSS2SI is encoded with VEX.L=0. Encoding VCVTSS2SI with VEX.L=1 may encounter unpredictable behavior across different processor generations.
VCVTSS2SI (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] (cid:197) Convert_Single_Precision_Floating_Point_To_Integer(SRC[31:0]); ELSE DEST[31:0] (cid:197) Convert_Single_Precision_Floating_Point_To_Integer(SRC[31:0]); FI;(V)CVTSS2SI (Legacy and VEX.128 encoded version)
IF 64-bit Mode and OperandSize = 64 THEN DEST[63:0] (cid:197)Convert_Single_Precision_Floating_Point_To_Integer(SRC[31:0]); ELSE DEST[31:0] (cid:197)Convert_Single_Precision_Floating_Point_To_Integer(SRC[31:0]); FI;
VCVTSS2SI int _mm_cvtss_i32( __m128 a); VCVTSS2SI int _mm_cvt_roundss_i32( __m128 a, int r); VCVTSS2SI __int64 _mm_cvtss_i64( __m128 a); VCVTSS2SI __int64 _mm_cvt_roundss_i64( __m128 a, int r);
Invalid, Precision
VEX-encoded instructions, see Exceptions Type 3; additionally |
If VEX.vvvv != 1111B. |
EVEX-encoded instructions, see Exceptions Type E3NF. |