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compiler-rt: Implement multc3 - quad-precision complex multiplication

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This may be reworked based on upstream discussion. This version is here
to support arm64 world builds.

Reviewed by:	ed
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D2173
This commit is contained in:
Ed Maste 2015-04-07 19:28:53 +00:00
parent d92661658b
commit 13553dc6bd
2 changed files with 74 additions and 0 deletions
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73
contrib/compiler-rt/lib/builtins/multc3.c Normal file
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@ -0,0 +1,73 @@
/* ===-- multc3.c - Implement __multc3 -------------------------------------===
*
* The LLVM Compiler Infrastructure
*
* This file is dual licensed under the MIT and the University of Illinois Open
* Source Licenses. See LICENSE.TXT for details.
*
* ===----------------------------------------------------------------------===
*
* This file implements __multc3 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
#include "int_math.h"
/* Returns: the product of a + ib and c + id */
COMPILER_RT_ABI long double _Complex
__multc3(long double __a, long double __b, long double __c, long double __d)
{
long double __ac = __a * __c;
long double __bd = __b * __d;
long double __ad = __a * __d;
long double __bc = __b * __c;
long double _Complex z;
__real__ z = __ac - __bd;
__imag__ z = __ad + __bc;
if (crt_isnan(__real__ z) && crt_isnan(__imag__ z))
{
int __recalc = 0;
if (crt_isinf(__a) || crt_isinf(__b))
{
__a = crt_copysignl(crt_isinf(__a) ? 1 : 0, __a);
__b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b);
if (crt_isnan(__c))
__c = crt_copysignl(0, __c);
if (crt_isnan(__d))
__d = crt_copysignl(0, __d);
__recalc = 1;
}
if (crt_isinf(__c) || crt_isinf(__d))
{
__c = crt_copysignl(crt_isinf(__c) ? 1 : 0, __c);
__d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d);
if (crt_isnan(__a))
__a = crt_copysignl(0, __a);
if (crt_isnan(__b))
__b = crt_copysignl(0, __b);
__recalc = 1;
}
if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) ||
crt_isinf(__ad) || crt_isinf(__bc)))
{
if (crt_isnan(__a))
__a = crt_copysignl(0, __a);
if (crt_isnan(__b))
__b = crt_copysignl(0, __b);
if (crt_isnan(__c))
__c = crt_copysignl(0, __c);
if (crt_isnan(__d))
__d = crt_copysignl(0, __d);
__recalc = 1;
}
if (__recalc)
{
__real__ z = CRT_INFINITY * (__a * __c - __b * __d);
__imag__ z = CRT_INFINITY * (__a * __d + __b * __c);
}
}
return z;
}

1
lib/libcompiler_rt/Makefile
View File

@ -108,6 +108,7 @@ SRCF= absvdi2 \
mulvdi3 \
mulvsi3 \
mulvti3 \
multc3 \
mulxc3 \
negdf2 \
negdi2 \