On 2018-10-19 2:26 AM, Helge Deller wrote:
And in the Linux kernel source (arch/parisc/include/asm/assembly.h) I see
/* Shift Left - note the r and t can NOT be the same! */
.macro shl r, sa, t
dep,z \r, 31-(\sa), 32-(\sa), \t
Should be zdep.
Ok.
What about the note "r and t can NOT be the same!" ?
Is that bogus or true for the dep case at least?
The comment is bogus. The only limitation is the field specified by the
position and length arguments
cannot extend beyond the leftmost bit. The macro is equivalent to the
shlw pseudo-operation (page
7-43 of PA 2.0 Architecture). I believe the hardware uses temporary
registers to do the manipulation.
Dave
--
John David Anglin dave.anglin@xxxxxxxx
