image/svg+xmlVRCP14SS—Compute Approximate Reciprocal of Scalar Float32 ValueInstruction Operand EncodingDescriptionThis instruction performs a SIMD computation of the approximate reciprocal of the low single-precision floating-point value in the second source operand (the third operand) and stores the result in the low quadword element of the destination operand (the first operand) according to the writemask k1. Bits (127:32) of the XMM register desti-nation are copied from corresponding bits in the first source operand (the second operand). The maximum relative error for this approximation is less than 2-14. The source operand can be an XMM register or a 32-bit memory loca-tion. The destination operand is an XMM register.The VRCP14SS instruction is not affected by the rounding control bits in the MXCSR register. When a source value is a 0.0, an ∞ with the sign of the source value is returned. A denormal source value will be treated as zero only in case of DAZ bit set in MXCSR. Otherwise it is treated correctly (i.e. not as a 0.0). Underflow results are flushed to zero only in case of FTZ bit set in MXCSR. Otherwise it will be treated correctly (i.e. correct underflow result is written) with the sign of the operand. When a source value is a SNaN or QNaN, the SNaN is converted to a QNaN or the source QNaN is returned. See Table 5-14 for special-case input values.MXCSR exception flags are not affected by this instruction and floating-point exceptions are not reported.A numerically exact implementation of VRCP14xx can be found at https://software.intel.com/en-us/articles/refer-ence-implementations-for-IA-approximation-instructions-vrcp14-vrsqrt14-vrcp28-vrsqrt28-vexp2.OperationVRCP14SS (EVEX version)IF k1[0] OR *no writemask*THEN DEST[31:0] := APPROXIMATE(1.0/SRC2[31:0]);ELSE IF *merging-masking*; merging-maskingTHEN *DEST[31:0] remains unchanged*ELSE ; zeroing-maskingDEST[31:0] := 0FI;FI;DEST[127:32] := SRC1[127:32]DEST[MAXVL-1:128] := 0Opcode/InstructionOp / En64/32 bit Mode SupportCPUID Feature FlagDescriptionEVEX.LLIG.66.0F38.W0 4D /rVRCP14SS xmm1 {k1}{z}, xmm2, xmm3/m32AV/VAVX512FComputes the approximate reciprocal of the scalar single-precision floating-point value in xmm3/m32 and stores the results in xmm1 using writemask k1. Also, upper double-precision floating-point value (bits[127:32]) from xmm2 is copied to xmm1[127:32]. Op/EnTuple TypeOperand 1Operand 2Operand 3Operand 4ATuple1 ScalarModRM:reg (w)EVEX.vvvv (r)ModRM:r/m (r)NA

image/svg+xmlIntel C/C++ Compiler Intrinsic EquivalentVRCP14SS __m128 _mm_rcp14_ss( __m128 a, __m128 b);VRCP14SS __m128 _mm_mask_rcp14_ss(__m128 s, __mmask8 k, __m128 a, __m128 b);VRCP14SS __m128 _mm_maskz_rcp14_ss( __mmask8 k, __m128 a, __m128 b);SIMD Floating-Point ExceptionsNoneOther ExceptionsSee Table2-51, “Type E5 Class Exception Conditions”.

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