diff options
Diffstat (limited to 'lib/ppc/gcc_qmul.c')
| -rw-r--r-- | lib/ppc/gcc_qmul.c | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/lib/ppc/gcc_qmul.c b/lib/ppc/gcc_qmul.c index 26d899ee..fb4c5164 100644 --- a/lib/ppc/gcc_qmul.c +++ b/lib/ppc/gcc_qmul.c @@ -1,9 +1,11 @@ -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. +/* This file is distributed under the University of Illinois Open Source + * License. See LICENSE.TXT for details. + */ -// long double __gcc_qmul(long double x, long double y); -// This file implements the PowerPC 128-bit double-double multiply operation. -// This implementation is shamelessly cribbed from Apple's DDRT, circa 1993(!) +/* long double __gcc_qmul(long double x, long double y); + * This file implements the PowerPC 128-bit double-double multiply operation. + * This implementation is shamelessly cribbed from Apple's DDRT, circa 1993(!) + */ #include "DD.h" @@ -12,29 +14,29 @@ long double __gcc_qmul(long double x, long double y) static const uint32_t infinityHi = UINT32_C(0x7ff00000); DD dst = { .ld = x }, src = { .ld = y }; - register double A = dst.hi, a = dst.lo, - B = src.hi, b = src.lo; + register double A = dst.s.hi, a = dst.s.lo, + B = src.s.hi, b = src.s.lo; double aHi, aLo, bHi, bLo; double ab, tmp, tau; ab = A * B; - // Detect special cases + /* Detect special cases */ if (ab == 0.0) { - dst.hi = ab; - dst.lo = 0.0; + dst.s.hi = ab; + dst.s.lo = 0.0; return dst.ld; } const doublebits abBits = { .d = ab }; if (((uint32_t)(abBits.x >> 32) & infinityHi) == infinityHi) { - dst.hi = ab; - dst.lo = 0.0; + dst.s.hi = ab; + dst.s.lo = 0.0; return dst.ld; } - // Generic cases handled here. + /* Generic cases handled here. */ aHi = high26bits(A); bHi = high26bits(B); aLo = A - aHi; @@ -44,8 +46,8 @@ long double __gcc_qmul(long double x, long double y) tmp += (A * b + a * B); tau = ab + tmp; - dst.lo = (ab - tau) + tmp; - dst.hi = tau; + dst.s.lo = (ab - tau) + tmp; + dst.s.hi = tau; return dst.ld; } |