diff options
| author | Richard Henderson <rth@redhat.com> | 2003-02-05 14:37:54 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2003-02-05 14:37:54 -0800 |
| commit | 7dba8395e27f52d22aa11ff2fc147858e34f2a9d (patch) | |
| tree | e14ea46575bce454a67edbb9d6bc03000c970bcd /gcc/doc/rtl.texi | |
| parent | 8d705469aaefd27a439760de0c216ff036f92e11 (diff) | |
| download | gcc-7dba8395e27f52d22aa11ff2fc147858e34f2a9d.zip gcc-7dba8395e27f52d22aa11ff2fc147858e34f2a9d.tar.gz gcc-7dba8395e27f52d22aa11ff2fc147858e34f2a9d.tar.bz2 | |
defaults.h (CLZ_DEFINED_VALUE_AT_ZERO): New.
* defaults.h (CLZ_DEFINED_VALUE_AT_ZERO): New.
(CTZ_DEFINED_VALUE_AT_ZERO): New.
* doc/rtl.texi, doc/tm.texi: Document them.
* combine.c (nonzero_bits) [CLZ, CTZ]: Handle the definedness
of the value at zero properly.
* fold-const.c (tree_expr_nonnegative_p): Likewise.
* simplify-rtx.c (simplify_unary_operation): Likewise.
* config/alpha/alpha.h (CLZ_DEFINED_VALUE_AT_ZERO): New.
(CTZ_DEFINED_VALUE_AT_ZERO): New.
* config/arm/arm.c (TARGET_INIT_BUILTINS): Remove.
(TARGET_EXPAND_BUILTIN): Remove.
(def_builtin, arm_init_builtins, arm_expand_builtin): Remove.
* config/arm/arm.h (CLZ_DEFINED_VALUE_AT_ZERO): New.
(enum arm_builtins): Remove.
* config/arm/arm.md (UNSPEC_CLZ): Remove.
(clzsi2): Rename from clz; use clz instead of unspec.
(ctzsi2): New.
* config/arm/arm-protos.h: Update.
From-SVN: r62453
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. |