diff options
Diffstat (limited to 'gcc/doc/rtl.texi')
| -rw-r--r-- | gcc/doc/rtl.texi | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi index 1698517..7e696fa 100644 --- a/gcc/doc/rtl.texi +++ b/gcc/doc/rtl.texi @@ -1850,7 +1850,8 @@ valid. @item (clz:@var{m} @var{x}) Represents the number of leading 0-bits in @var{x}, represented as an integer of mode @var{m}, starting at the most significant bit position. -If @var{x} is zero, the value is undefined. Note that this is one of +If @var{x} is zero, the value is determined by +@code{CLZ_DEFINED_VALUE_AT_ZERO}. Note that this is one of the few expressions that is not invariant under widening. The mode of @var{x} will usually be an integer mode. @@ -1858,7 +1859,8 @@ the few expressions that is not invariant under widening. The mode of @item (ctz:@var{m} @var{x}) Represents the number of trailing 0-bits in @var{x}, represented as an integer of mode @var{m}, starting at the least significant bit position. -If @var{x} is zero, the value is undefined. Except for this case, +If @var{x} is zero, the value is determined by +@code{CTZ_DEFINED_VALUE_AT_ZERO}. Except for this case, @code{ctz(x)} is equivalent to @code{ffs(@var{x}) - 1}. The mode of @var{x} will usually be an integer mode. |