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    • 1. 发明授权
    • Fast multiplication of floating point values and integer powers of two
    • 浮点数和二进制的整数幂的快速乘法
    • US06233595B1
    • 2001-05-15
    • US09075074
    • 1998-05-08
    • Lei ChengFrank J. Gorishek, IVYi Liu
    • Lei ChengFrank J. Gorishek, IVYi Liu
    • G06F9302
    • G06F7/4876G06F9/30014
    • A method for performing fast multiplication in a microprocessor is disclosed. The method comprises detecting multiplication operations that have a floating point operand and an integer operand, wherein the integer operand is an integer power of two. Once detected, a multiplication operation meeting these criteria may be executed by using an integer adder to sum the integer power and the floating point operand's exponent to from a product exponent. The bias of the integer operand's exponent may also be subtracted. A product mantissa is simply copied from the floating point operand's mantissa. The floating point operand's sign bit may be inverted to form the product's sign bit if the integer operand is negative. Advantageously, the product is generated using integer addition which is faster than floating point multiplication. The method may be implemented in hardware or software.
    • 公开了一种在微处理器中执行快速乘法的方法。 该方法包括检测具有浮点操作数和整数操作数的乘法运算,其中整数操作数是2的整数幂。 一旦被检测到,可以通过使用整数加法器来执行满足这些标准的乘法运算,以从乘积指数将整数幂和浮点运算数的指数相加。 也可以减去整数操作数的指数的偏差。 产品尾数简单地从浮点运算符的尾数复制出来。 如果整数操作数为负,则浮点运算符的符号位可能会反转,以形成乘积符号位。 有利地,使用比浮点乘法更快的整数加法来产生乘积。 该方法可以在硬件或软件中实现。