diff options
| -rw-r--r-- | libgcc/ChangeLog | 5 | ||||
| -rw-r--r-- | libgcc/config/m32c/lib2funcs.c | 16 |
2 files changed, 20 insertions, 1 deletions
diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog index 9d629e6..62f9446 100644 --- a/libgcc/ChangeLog +++ b/libgcc/ChangeLog @@ -1,3 +1,8 @@ +2012-08-01 Nick Clifton <nickc@redhat.com> + + * config/m32c/lib2funcs.c (__clrsbhi2): New function. + Implements __clrsb for an HImode argument. + 2012-07-31 Nick Clifton <nickc@redhat.com> * config/stormy16/lib2funcs.c (__clrsbhi2): New function. diff --git a/libgcc/config/m32c/lib2funcs.c b/libgcc/config/m32c/lib2funcs.c index 274affc..76b237c 100644 --- a/libgcc/config/m32c/lib2funcs.c +++ b/libgcc/config/m32c/lib2funcs.c @@ -1,5 +1,5 @@ /* libgcc routines for R8C/M16C/M32C - Copyright (C) 2005, 2009 + Copyright (C) 2005, 2009, 2012 Free Software Foundation, Inc. Contributed by Red Hat. @@ -132,3 +132,17 @@ __umoddi3 (uint32_type a, uint32_type b) { return udivmodsi4 (a, b, 1); } + +/* Returns the number of leading redundant sign bits in X. + I.e. the number of bits following the most significant bit which are + identical to it. There are no special cases for 0 or other values. */ + +int +__clrsbhi2 (word_type x) +{ + if (x < 0) + x = ~x; + if (x == 0) + return 15; + return __builtin_clz (x) - 1; +} |