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From aa2d23e57c9c95f0ffeb80cb035e5a5be52d8ef0 Mon Sep 17 00:00:00 2001
From: Michael Morrell <mmorrell@tachyum.com>
Date: Mon, 14 Oct 2019 09:07:31 -0400
Subject: [PATCH] fix cacosh results for arguments with negative imaginary part
---
src/complex/cacosh.c | 5 ++++-
src/complex/cacoshf.c | 5 ++++-
src/complex/cacoshl.c | 5 ++++-
3 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/src/complex/cacosh.c b/src/complex/cacosh.c
index 8e42f1ae..76127f75 100644
--- a/src/complex/cacosh.c
+++ b/src/complex/cacosh.c
@@ -4,6 +4,9 @@
double complex cacosh(double complex z)
{
+ int zineg = signbit(cimag(z));
+
z = cacos(z);
- return CMPLX(-cimag(z), creal(z));
+ if (zineg) return CMPLX(cimag(z), -creal(z));
+ else return CMPLX(-cimag(z), creal(z));
}
diff --git a/src/complex/cacoshf.c b/src/complex/cacoshf.c
index d7e6b545..8bd80581 100644
--- a/src/complex/cacoshf.c
+++ b/src/complex/cacoshf.c
@@ -2,6 +2,9 @@
float complex cacoshf(float complex z)
{
+ int zineg = signbit(cimagf(z));
+
z = cacosf(z);
- return CMPLXF(-cimagf(z), crealf(z));
+ if (zineg) return CMPLXF(cimagf(z), -crealf(z));
+ else return CMPLXF(-cimagf(z), crealf(z));
}
diff --git a/src/complex/cacoshl.c b/src/complex/cacoshl.c
index d3eaee20..3a284be9 100644
--- a/src/complex/cacoshl.c
+++ b/src/complex/cacoshl.c
@@ -8,7 +8,10 @@ long double complex cacoshl(long double complex z)
#else
long double complex cacoshl(long double complex z)
{
+ int zineg = signbit(cimagl(z));
+
z = cacosl(z);
- return CMPLXL(-cimagl(z), creall(z));
+ if (zineg) return CMPLXL(cimagl(z), -creall(z));
+ else return CMPLXL(-cimagl(z), creall(z));
}
#endif
--
2.24.1
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