drem

drem

Forms
drem = 115 (0x73)

Stack
..., value1.word1, value1.word2, value2.word1, value2.word2 ..., result.word1, result.word2

Description
Both value1 and value2 must be of type double. The values are popped from the operand stack. The result is calculated and pushed onto the operand stack as a double.

The result of a drem instruction is not the same as that of the so-called remainder operation defined by IEEE 754. The IEEE 754 "remainder" operation computes the remainder from a rounding division, not a truncating division, and so its behavior is not analogous to that of the usual integer remainder operator. Instead, the Java Virtual Machine defines drem to behave in a manner analogous to that of the Java Virtual Machine integer remainder instructions (irem and lrem); this may be compared with the C library function fmod.

The result of a drem instruction is governed by these rules:

• If either value is NaN, the result is NaN.
• If neither value is NaN, the sign of the result equals the sign of the dividend.
• If the dividend is an infinity, or the divisor is a zero, or both, the result is NaN.
• If the dividend is finite and the divisor is an infinity, the result equals the dividend.

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Java Virtual Machine Specification (HTML generated by dkramer on February 25, 1997)
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