mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-13 00:30:07 +00:00
183a34dc4a
The operand modifier %s on powerpc is an undocumented internal implementation detail of GCC. Besides that, the GCC community wants to remove it. This patch rewrites the expressions that use this modifier with logically equivalent expressions that don't require it. Explanation for the substitution: The %s modifier takes an immediate operand and prints 32 less such immediate. Thus, in the previous code, the expression resulted in: 32 - __builtin_ffs(e) where e was guaranteed to have exactly a single bit set, by the following expressions: (e & (e-1) == 0) : e has at most one bit set. (e != 0) : e is not zero, thus it has at least one bit set. Since we guarantee that there is exactly only one bit set, the following statement is true: 32 - __builtin_ffs(e) == __builtin_clz(e) Thus, we can replace __builtin_ffs with __builtin_clz and remove the %s operand modifier. |
||
|---|---|---|
| .. | ||
| endian.h | ||
| fenv.h | ||
| fenvinline.h | ||
| hwcap.h | ||
| link.h | ||
| mathdef.h | ||
| mathinline.h | ||
| setjmp.h | ||