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stepcompress: Optimize safe_sqrt() code 

Optimize the code by putting the uncommon case out-of-line.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2016-11-14 15:12:53 -05:00
parent 5a1ec817d4
commit fd7cb99f47
1 changed files with 8 additions and 3 deletions
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11
klippy/stepcompress.c
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@ -256,16 +256,21 @@ check_line(struct stepcompress *sc, struct step_move move)
* Step compress interface * Step compress interface
****************************************************************/ ****************************************************************/
#define likely(x) __builtin_expect(!!(x), 1)
// Wrapper around sqrt() to handle small negative numbers // Wrapper around sqrt() to handle small negative numbers
static inline double static double
safe_sqrt(double v) _safe_sqrt(double v)
{ {
if (v < 0. && v > -0.001) if (v > -0.001)
// Due to floating point truncation, it's possible to get a // Due to floating point truncation, it's possible to get a
// small negative number - treat it as zero. // small negative number - treat it as zero.
return 0.; return 0.;
return sqrt(v); return sqrt(v);
} }
static inline double safe_sqrt(double v) {
return likely(v >= 0.) ? sqrt(v) : _safe_sqrt(v);
}
// Allocate a new 'stepcompress' object // Allocate a new 'stepcompress' object
struct stepcompress * struct stepcompress *