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. 0 0 0 1 1 1 1 0 0 x 1 0 1 0 0 1 0 1 0 0 0 0 0 FRINT64Z <Sd>, <Sn> 1 FRINT64Z <Dd>, <Dn> if !IsFeatureImplemented(FEAT_FRINTTS) then UNDEFINED; if ftype IN {'1x'} then UNDEFINED; constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = 32 << UInt(ftype<0>); constant integer intsize = 64; constant FPRounding rounding = FPRounding_ZERO; <Sd> Is the 32-bit name of the SIMD&FP destination register, encoded in the "Rd" field. <Sn> Is the 32-bit name of the SIMD&FP source register, encoded in the "Rn" field. <Dd> Is the 64-bit name of the SIMD&FP destination register, encoded in the "Rd" field. <Dn> Is the 64-bit name of the SIMD&FP source register, encoded in the "Rn" field. CheckFPEnabled64(); constant bits(esize) operand = V[n, esize]; bits(128) result = if IsMerging(FPCR) then V[d, 128] else Zeros(128); Elem[result, 0, esize] = FPRoundIntN(operand, FPCR, rounding, intsize); V[d, 128] = result;