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linux-next/arch/h8300/lib/ashrdi3.c
Yoshinori Sato a71a29de4c h8300: library functions
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
2015-06-23 13:35:54 +09:00

25 lines
494 B
C

#include "libgcc.h"
DWtype __ashrdi3(DWtype u, word_type b)
{
const DWunion uu = {.ll = u};
const word_type bm = (sizeof (Wtype) * BITS_PER_UNIT) - b;
DWunion w;
if (b == 0)
return u;
if (bm <= 0) {
/* w.s.high = 1..1 or 0..0 */
w.s.high = uu.s.high >> (sizeof (Wtype) * BITS_PER_UNIT - 1);
w.s.low = uu.s.high >> -bm;
} else {
const UWtype carries = (UWtype) uu.s.high << bm;
w.s.high = uu.s.high >> b;
w.s.low = ((UWtype) uu.s.low >> b) | carries;
}
return w.ll;
}