mirror of
https://github.com/jart/cosmopolitan.git
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4f98ad1054
- Improve i/o perf on New Technology - Code cleanup on read() for New Technology - Fix bad bug with dup() of socket on New Technology - Clean up some more strace errors on New Technology
23 lines
678 B
C
23 lines
678 B
C
#ifndef COSMOPOLITAN_LIBC_BITS_MIDPOINT_H_
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#define COSMOPOLITAN_LIBC_BITS_MIDPOINT_H_
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#include "libc/assert.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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/**
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* Computes `(a + b) / 2` assuming unsigned.
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*/
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#define _midpoint(a, b) \
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({ \
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typeof((a) + (b)) a_ = (a); \
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typeof(a_) b_ = (b); \
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assert(a_ >= 0); \
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assert(b_ >= 0); \
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asm("add\t%1,%0\n\t" \
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"rcr\t%0" \
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: "+r"(a_) \
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: "r"(b_)); \
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a_; \
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})
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_BITS_MIDPOINT_H_ */
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