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Use cpack() and the gcc extension __imag__ to implement cimag() and
conj() instead of using expressions like z * I. The latter is bad for several reasons: 1. It is implemented using arithmetic, which is unnecessary, and can generate floating point exceptions, contrary to the requirements on these functions. 2. gcc implements complex multiplication using a formula that breaks down for infinities, e.g., it gives INFINITY * I == nan + inf I.
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=181374
@ -31,5 +31,6 @@
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double
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cimag(double complex z)
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{
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return -z * I;
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return (__imag__ z);
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}
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@ -31,5 +31,6 @@
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float
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cimagf(float complex z)
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{
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return -z * I;
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return (__imag__ z);
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}
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@ -31,5 +31,6 @@
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long double
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cimagl(long double complex z)
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{
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return -z * I;
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return (__imag__ z);
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}
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@ -28,8 +28,11 @@
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#include <complex.h>
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#include "math_private.h"
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double complex
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conj(double complex z)
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{
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return creal(z) - I * cimag(z);
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return (cpack(creal(z), -cimag(z)));
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}
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@ -28,8 +28,11 @@
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#include <complex.h>
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#include "math_private.h"
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float complex
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conjf(float complex z)
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{
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return crealf(z) - I * cimagf(z);
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return (cpackf(crealf(z), -cimagf(z)));
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}
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@ -28,8 +28,11 @@
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#include <complex.h>
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#include "math_private.h"
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long double complex
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conjl(long double complex z)
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{
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return creall(z) - I * cimagl(z);
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return (cpackl(creall(z), -cimagl(z)));
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}
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