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    • 6. 发明申请
    • DOUBLE ROUNDED COMBINED FLOATING-POINT MULTIPLY AND ADD
    • 双重圆形组合浮点数乘法和加法
    • WO2014004220A1
    • 2014-01-03
    • PCT/US2013/046619
    • 2013-06-19
    • INTEL CORPORATIONSAMUDRALA, SridharMAGKLIS, GrigoriosLUPON, MarcDITZEL, David R.
    • SAMUDRALA, SridharMAGKLIS, GrigoriosLUPON, MarcDITZEL, David R.
    • G06F9/06G06F9/30
    • G06F7/4876G06F7/483G06F7/485G06F7/4991G06F7/49915G06F7/5443G06F2207/4802
    • Methods, apparatus, instructions and logic are disclosed providing double rounded combined floating-point multiply and add functionality as scalar or vector SIMD instructions or as fused micro-operations. Embodiments include detecting floating-point (FP) multiplication operations and subsequent FP operations specifying as source operands results of the FP multiplications. The FP multiplications and the subsequent FP operations are encoded as combined FP operations including rounding of the results of FP multiplication followed by the subsequent FP operations. The encoding of said combined FP operations may be stored and executed as part of an executable thread portion using fused-multiply-add hardware that includes overflow detection for the product of FP multipliers, first and second FP adders to add third operand addend mantissas and the products of the FP multipliers with different rounding inputs based on overflow, or no overflow, in the products of the FP multiplier. Final results are selected respectively using overflow detection.
    • 公开了提供双向组合浮点乘法和附加功能作为标量或向量SIMD指令或作为融合微操作的方法,装置,指令和逻辑。 实施例包括检测浮点(FP)乘法运算和指定作为FP乘法的源操作数结果的后续FP操作。 FP乘法和随后的FP操作被编码为组合FP操作,包括对FP乘法的结果进行舍入,随后是随后的FP操作。 所述组合FP操作的编码可以作为可执行线程部分的一部分使用融合乘法硬件来存储和执行,所述融合乘法加法器包括用于FP乘法器的乘积的溢出检测,第一和第二FP加法器来添加第三操作数加法尾数, 基于FP乘法器产品中溢出或不溢出的FP乘法器的不同舍入输入的产品。 分别使用溢出检测选择最终结果。