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author | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-01-28 02:48:15 +0900 |
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committer | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-06-23 13:35:54 +0900 |
commit | a71a29de4c2f95563220a472f265f0bd74701d52 (patch) | |
tree | 2e0b84cdc079ce9dc038d7bf3f86ebdd0315cb2e /arch/h8300/lib/ashrdi3.c | |
parent | bbeb79acb3b44f727f6267e1f6db9b3fdf791c24 (diff) | |
download | op-kernel-dev-a71a29de4c2f95563220a472f265f0bd74701d52.zip op-kernel-dev-a71a29de4c2f95563220a472f265f0bd74701d52.tar.gz |
h8300: library functions
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Diffstat (limited to 'arch/h8300/lib/ashrdi3.c')
-rw-r--r-- | arch/h8300/lib/ashrdi3.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/h8300/lib/ashrdi3.c b/arch/h8300/lib/ashrdi3.c new file mode 100644 index 0000000..070adf9 --- /dev/null +++ b/arch/h8300/lib/ashrdi3.c @@ -0,0 +1,24 @@ +#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; +} |