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| author | Nick Clifton <nickc@redhat.com> | 2012-08-01 09:36:01 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@gcc.gnu.org> | 2012-08-01 09:36:01 +0000 |
| commit | d04aacfc87503addc886a6a0ee9e69d73ffc280f (patch) | |
| tree | 74fcf3af710e09b1234961cf95516e4a23b7acdc /libgcc | |
| parent | cecd512351699ce0a43ae82c12b7f78c30ea78af (diff) | |
| download | gcc-d04aacfc87503addc886a6a0ee9e69d73ffc280f.zip gcc-d04aacfc87503addc886a6a0ee9e69d73ffc280f.tar.gz gcc-d04aacfc87503addc886a6a0ee9e69d73ffc280f.tar.bz2 | |
lib2funcs.c (__clrsbhi2): New function.
* config/m32c/lib2funcs.c (__clrsbhi2): New function.
Implements __clrsb for an HImode argument.
From-SVN: r190032
Diffstat (limited to 'libgcc')
| -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; +} |