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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.
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | x | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | Rn | Rd | ||||||||
ftype | op |
if !HaveFrintExt() then UNDEFINED;
integer d = UInt(Rd);
integer n = UInt(Rn);
integer datasize;
case ftype of
case type of
when '00' datasize = 32;
when '01' datasize = 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);
<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. |
<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. |
CheckFPAdvSIMDEnabled64(); bits(datasize) result; bits(datasize) operand = V[n]; result = FPRoundIntN(operand, FPCR, rounding, intsize); V[d] = result;
Internal version only: isa v30.41v30.3, AdvSIMD v27.08v27.04, pseudocode r8p5_00bet2_rc5v85-xml-00bet9_rc1_1, sve v8.5-00bet10_rc5v8.5-00bet9_rc1
; Build timestamp: 2019-03-28T062018-12-12T11:3450
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This document is Non-Confidential.
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