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    • 41. 发明授权
    • Preparation of alpha-formylamino nitriles
    • 阿尔法 - 甲酰胺硝酸盐的制备
    • US5077426A
    • 1991-12-31
    • US627022
    • 1990-12-13
    • Rolf FikentscherMichael Kroener
    • Rolf FikentscherMichael Kroener
    • C07C253/30C07C255/29C07C255/60
    • C07C255/29
    • A process for preparing .alpha.-formylamino nitriles of the formula Ia ##STR1## and Ib ##STR2## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and each is hydrogen or unsubstituted or substituted, with substituents which are inert under the reaction conditions, aliphatic or heteroaliphatic radicals with 1 to 10, cycloaliphatic or heterocycloaliphatic radicals with 3 to 6, araliphatic radicals with 7 to 12, heteroaraliphatic radicals with 4 to 12, aromatic radicals with 6 to 10 or heteroarometic radicals with 3 to 10 carbon atoms, with the priviso that at least one of R.sup.1 and R.sup.2 or R.sup.3 and R.sup.4 is hydrogen, comprises reacting an iminodiacetonitrile of the formula II ##STR3## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the abovementioned meanings, with formamide of the formula III ##STR4## in the presence of formic acid or with a compound which provides formic acid, in the presence of acids.
    • 制备式Ia Ia和Ib Ib的α-甲酰氨基腈的方法,其中R 1,R 2,R 3和R 4相同或不同,各自为氢或未取代或取代的取代基, 反应条件,具有1-10个脂环族或杂脂肪族基团的脂族或杂脂族基团,具有3至6个,具有7至12个芳脂族基团,具有4至12个杂脂肪族基团,6至10个芳族基团或具有3至10个碳原子的杂芳族基团 其中R 1和R 2或R 3和R 4中的至少一个是氢,包括使式II II的亚氨基二乙腈与式III的甲酰胺反应,其中R 1,R 2,R 3和R 4具有上述含义 在甲酸存在下或在酸存在下与提供甲酸的化合物反应。
    • 46. 发明授权
    • Fast floating point compare with slower backup for corner cases
    • 快速浮点与较慢的备份角落比较
    • US08407275B2
    • 2013-03-26
    • US12255968
    • 2008-10-22
    • Maarten J. BoersmaMichael KroenerSilvia M. MuellerJochen Preiss
    • Maarten J. BoersmaMichael KroenerSilvia M. MuellerJochen Preiss
    • G06F7/02
    • G06F9/30021G06F9/30025
    • A floating point processor unit executes a floating point compare instruction with two operands of the same or different precision by comparing the two operands in integer format, which speeds up the execution of the floating point compare instruction significantly. The floating point processor now executes the floating point compare instruction at least twice as fast or faster (e.g., two clock cycles instead of five clock cycles in the prior art) for nearly most operand cases (e.g., 99% of all cases). Only the rare corner cases require additional operations on one of the operands and thus require additional cycles of execution time because the integer compare operation will not work for these corner cases. This is due to the fact that one operand is a single precision subnormal number in an unnormalized representation (i.e., has two representations) and the other operand is in the SP subnormal range such that the integer compare operation will fail.
    • 浮点处理器单元通过比较整数格式的两个操作数来执行具有相同或不同精度的两个操作数的浮点比较指令,这显着地加快了浮点比较指令的执行。 浮点处理器现在对于几乎大多数操作数情况(例如,所有情况的99%),至少执行两倍快或更快(例如,现有技术中的两个时钟周期而不是五个时钟周期)的浮点比较指令。 只有罕见的角落情况需要在其中一个操作数上进行额外的操作,因此需要额外的执行周期,因为整数比较操作将不适用于这些角色。 这是由于一个操作数是非正规化表示中的单精度子正规数(即,具有两个表示),另一个操作数处于SP子正常范围,使得整数比较操作将失败。