image/svg+xml FRNDINT—Round to Integer Description Rounds the source value in the ST(0) register to the nearest integral value, depending on the current rounding mode (setting of the RC field of the FPU control word), and stores the result in ST(0). If the source value is ∞ , the value is not changed. If the source value is not an integral value, the floating-point inexact-result exception (#P) is generated. This instruction’s operation is the same in non-64-bit modes and 64-bit mode. Operation ST(0) := RoundToIntegralValue(ST(0)); FPU Flags Affected C1Set to 0 if stack underflow occurred. Set if result was rounded up; cleared otherwise. C0, C2, C3 Undefined. Floating-Point Exceptions #ISStack underflow occurred. #IASource operand is an SNaN value or unsupported format. #DSource operand is a denormal value. #PSource operand is not an integral value. Protected Mode Exceptions #NMCR0.EM[bit 2] or CR0.TS[bit 3] = 1. #MF If there is a pending x87 FPU exception. #UD If the LOCK prefix is used. Real-Address Mode Exceptions Same exceptions as in protected mode. Virtual-8086 Mode Exceptions Same exceptions as in protected mode. Compatibility Mode Exceptions Same exceptions as in protected mode. 64-Bit Mode Exceptions Same exceptions as in protected mode. OpcodeInstruction64-Bit Mode Compat/ Leg Mode Description D9 FCFRNDINTValidValidRound ST(0) to an integer. This UNOFFICIAL reference was generated from the official Intel® 64 and IA-32 Architectures Software Developer’s Manual by a dumb script. There is no guarantee that some parts aren't mangled or broken and is distributed WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE .