We already have a C based copysign function which is used on arm.
On arm, long double is equal to double, so just call the normal
double function instead of using the handwritten assembly.
The C based copysign function ends up at 5 instructions including
"bx lr", which is significantly shorter than this version.
---
mingw-w64-crt/math/copysignl.S | 14 +-------------
1 file changed, 1 insertion(+), 13 deletions(-)
diff --git a/mingw-w64-crt/math/copysignl.S b/mingw-w64-crt/math/copysignl.S
index 1ee4a45..5194330 100644
--- a/mingw-w64-crt/math/copysignl.S
+++ b/mingw-w64-crt/math/copysignl.S
@@ -33,19 +33,7 @@ __MINGW_USYMBOL(copysignl):
movq %rcx, %rax
ret
#elif defined(_ARM_) || defined(__arm__)
- fcmpzd d1
- fmstat
- bmi 1f /* jump if d1 is negative */
- fcmpzd d0
- fmstat
- it mi
- vnegmi.f64 d0, d0 /* negate d0 if it is negative */
- bx lr
- 1: fcmpzd d0
- fmstat
- it pl
- vnegpl.f64 d0, d0 /* negate d0 if it is positive */
- bx lr
+ b copysign
#elif defined(_X86_) || defined(__i386__)
movl 24(%esp),%edx
movl 12(%esp),%eax
--
2.7.4
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