FRINT64Z (scalar)

Floating-point Round to 64-bit Integer toward Zero (scalar). This instruction rounds a floating-point value in the SIMD&FP source register to an integral floating-point value that fits into a 64-bit integer size using the Round towards Zero rounding mode, and writes the result to the SIMD&FP destination register.

A zero input returns a zero result with the same sign. When the result value is not numerically equal to the {corresponding} input value, an Inexact exception is raised. When the input is infinite, NaN or out-of-range, the instruction returns {for the corresponding result value} the most negative integer representable in the destination size, and an Invalid Operation floating-point exception is raised.

A floating-point exception can be generated by this instruction. Depending on the settings in FPCR, the exception results in either a flag being set in FPSR, or a synchronous exception being generated. For more information, see Floating-point exception traps.

Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.

Floating-point
(FEAT_FRINTTS)

if !HaveFrintExt() then UNDEFINED; integer d = UInt(Rd); integer n = UInt(Rn); integer esize; case ftype of when '00' esize = 32; when '01' esize = 64; when '1x' UNDEFINED; integer intsize = if op<1> == '0' then 32 else 64; FPRounding rounding = if op<0> == '0' then FPRounding_ZERO else FPRoundingMode(FPCR[]);