FCVTZU (vector, fixed-point)

Floating-point convert to unsigned fixed-point, rounding toward zero (vector)

This instruction converts a scalar or each element in a vector from floating-point to fixed-point unsigned integer using the Round towards Zero rounding mode, and writes the result to the general-purpose destination register.

This instruction can generate a floating-point exception. 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 exceptions and 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.

It has encodings from 2 classes: Scalar and Vector

Scalar
(FEAT_AdvSIMD)

Decode for this encoding

if !IsFeatureImplemented(FEAT_AdvSIMD) then EndOfDecode(Decode_UNDEF); if immh IN {'000x'} || (immh IN {'001x'} && !IsFeatureImplemented(FEAT_FP16)) then EndOfDecode(Decode_UNDEF); constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = if immh IN {'1xxx'} then 64 else if immh IN {'01xx'} then 32 else 16; constant integer datasize = esize; constant integer elements = 1; constant integer fracbits = (esize * 2) - UInt(immh:immb); constant boolean unsigned = TRUE; constant FPRounding rounding = FPRounding_ZERO;

Vector
(FEAT_AdvSIMD)

Decode for this encoding

if !IsFeatureImplemented(FEAT_AdvSIMD) then EndOfDecode(Decode_UNDEF); if immh == '0000' then SEE(asimdimm); if immh IN {'000x'} || (immh IN {'001x'} && !IsFeatureImplemented(FEAT_FP16)) then EndOfDecode(Decode_UNDEF); if immh<3>:Q == '10' then EndOfDecode(Decode_UNDEF); constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = if immh IN {'1xxx'} then 64 else if immh IN {'01xx'} then 32 else 16; constant integer datasize = 64 << UInt(Q); constant integer elements = datasize DIV esize; constant integer fracbits = (esize * 2) - UInt(immh:immb); constant boolean unsigned = TRUE; constant FPRounding rounding = FPRounding_ZERO;