Volume 2A Instruction Set Reference A-M (794101), страница 101

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2A 3-635INSTRUCTION SET REFERENCE, A-MMAXPD—Return Maximum Packed Double-Precision Floating-PointValuesOpcodeInstructionOp/En64-BitModeCompat/ DescriptionLeg Mode66 0F 5F /rMAXPD xmm1,xmm2/m128AValidValidReturn the maximumdouble-precision floatingpoint values betweenxmm2/m128 and xmm1.Instruction Operand EncodingOp/EnOperand 1Operand 2Operand 3Operand 4AModRM:reg (r, w)ModRM:r/m (r)NANADescriptionPerforms a SIMD compare of the packed double-precision floating-point values in thedestination operand (first operand) and the source operand (second operand), andreturns the maximum value for each pair of values to the destination operand.

Thesource operand can be an XMM register or a 128-bit memory location. The destination operand is an XMM register.If the values being compared are both 0.0s (of either sign), the value in the secondoperand (source operand) is returned. If a value in the second operand is an SNaN,that SNaN is forwarded unchanged to the destination (that is, a QNaN version of theSNaN is not returned).If only one value is a NaN (SNaN or QNaN) for this instruction, the second operand(source operand), either a NaN or a valid floating-point value, is written to the result.If instead of this behavior, it is required that the NaN source operand (from either thefirst or second operand) be returned, the action of MAXPD can be emulated using asequence of instructions, such as, a comparison followed by AND, ANDN and OR.In 64-bit mode, use of the REX.R prefix permits this instruction to access additionalregisters (XMM8-XMM15).OperationDEST[63:0] ←3-636 Vol.

2AIF ((DEST[63:0] = 0.0) and (SRC[63:0] = 0.0))THEN SRC[63:0];ELSE IF (DEST[63:0] = SNaN) THEN SRC[63:0]; FI;ELSE IF (SRC[63:0] = SNaN) THEN SRC[63:0]; FI;ELSE IF (DEST[63:0] > SRC[63:0])THEN DEST[63:0];ELSE SRC[63:0]; FI; FI;MAXPD—Return Maximum Packed Double-Precision Floating-Point ValuesINSTRUCTION SET REFERENCE, A-MDEST[127:64] ←IF ((DEST[127:64] = 0.0) and (SRC[127:64] = 0.0))THEN SRC[127:64];ELSE IF (DEST[127:64] = SNaN) THEN SRC[127:64]; FI;ELSE IF (SRC[127:64] = SNaN) THEN SRC[127:64]; FI;ELSE IF (DEST[127:64] > SRC[63:0])THEN DEST[127:64];ELSE SRC[127:64]; FI; FI;Intel C/C++ Compiler<b>Текст обрезан, так как является слишком большим</b>.

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