http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55303
--- Comment #2 from Oleg Endo <olegendo at gcc dot gnu.org> 2013-03-02 16:23:57
UTC ---
For non-SH2A targets there is an opportunity to generate better insn sequences
for the special case
unsigned int test (unsigned int a)
{
return a > 1 ? 1 : a;
}
on SH2A:
tst r4,r4
movrt r0
if zero-displacement branches are not good:
tst r4,r4
mov #-1,r0
negc r0,r0
if zero-displacement branches are good:
tst r4,r4
bt 0f
mov #1,r1
0f:
This can be done by implementing a pattern
(umin:SI (match_operand:SI 1 "arith_reg_operand")
(const_int 1))
as it is already done for SH2A in attachment 29567.
