1 files changed, 60 insertions, 0 deletions
diff --git a/main/musl/fix-cacosh-results-for-arguments-with-negative-imagi.patch b/main/musl/fix-cacosh-results-for-arguments-with-negative-imagi.patch
new file mode 100644
index 0000000000..b9f812d0cc
--- /dev/null
+++ b/main/musl/fix-cacosh-results-for-arguments-with-negative-imagi.patch
@@ -0,0 +1,60 @@
+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
+