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authorDavid Herrmann <dh.herrmann@gmail.com>2014-12-29 17:51:36 +0100
committerDavid Herrmann <dh.herrmann@gmail.com>2014-12-30 01:39:01 +0100
commit180a60bc879ab0554297bc08a7a0b9274b119b55 (patch)
tree842c1afa088c3c26ce98856bcefde420dc6257c2 /src/libsystemd/sd-bus
parent5ef378c1c5ba1a29a461e77685765da81163c853 (diff)
macro: add DIV_ROUND_UP()
This macro calculates A / B but rounds up instead of down. We explicitly do *NOT* use: (A + B - 1) / A as it suffers from an integer overflow, even though the passed values are properly tested against overflow. Our test-cases show this behavior. Instead, we use: A / B + !!(A % B) Note that on "Real CPUs" this does *NOT* result in two divisions. Instead, instructions like idivl@x86 provide both, the quotient and the remainder. Therefore, both algorithms should perform equally well (I didn't verify this, though).
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