FCVTNU (vector)

Floating-point convert to unsigned integer, rounding to nearest with ties to even (vector)

This instruction converts a scalar or each element in a vector from a floating-point value to an unsigned integer value using the Round to Nearest rounding mode, and writes the result to the SIMD&FP 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 4 classes: Scalar half-precision , Scalar single-precision and double-precision , Vector half-precision and Vector single-precision and double-precision

Scalar half-precision
(FEAT_AdvSIMD && FEAT_FP16)

Decode for this encoding

if !IsFeatureImplemented(FEAT_AdvSIMD) || !IsFeatureImplemented(FEAT_FP16) then EndOfDecode(Decode_UNDEF); constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = 16; constant integer datasize = esize; constant integer elements = 1; constant FPRounding rounding = FPDecodeRounding(o1:o2); constant boolean unsigned = TRUE;

Scalar single-precision and double-precision
(FEAT_AdvSIMD)

Decode for this encoding

if !IsFeatureImplemented(FEAT_AdvSIMD) then EndOfDecode(Decode_UNDEF); constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = 32 << UInt(sz); constant integer datasize = esize; constant integer elements = 1; constant FPRounding rounding = FPDecodeRounding(o1:o2); constant boolean unsigned = TRUE;

Vector half-precision
(FEAT_AdvSIMD && FEAT_FP16)

Decode for this encoding

if !IsFeatureImplemented(FEAT_AdvSIMD) || !IsFeatureImplemented(FEAT_FP16) then EndOfDecode(Decode_UNDEF); constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = 16; constant integer datasize = 64 << UInt(Q); constant integer elements = datasize DIV esize; constant FPRounding rounding = FPDecodeRounding(o1:o2); constant boolean unsigned = TRUE;

Vector single-precision and double-precision
(FEAT_AdvSIMD)

Decode for this encoding

if !IsFeatureImplemented(FEAT_AdvSIMD) then EndOfDecode(Decode_UNDEF); if sz:Q == '10' then EndOfDecode(Decode_UNDEF); constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = 32 << UInt(sz); constant integer datasize = 64 << UInt(Q); constant integer elements = datasize DIV esize; constant FPRounding rounding = FPDecodeRounding(o1:o2); constant boolean unsigned = TRUE;