[PATCH][SH] Check for 0 length with inlined strnlen builtin

[Oleg Endo]

On Tue, 2015-01-06 at 10:28 +0100, Christian Bruel wrote:
> Hello,
> 
> We should not enter the first iteration when length is 0. Testcase 
> attached. Difficult to reduce because register allocation generated 
> accidentally the correct return value.
> 
> testsuite OK
> 
> OK for 4.9 and trunk ?

In your patch:

+      emit_insn (gen_tstsi_t (len, len));

Please use 'gen_cmpeqsi_t (len, const0_rtx)' for comparing a value
against zero instead of the bit test insn.  Otherwise, I think it's OK
for trunk and 4.9.

Cheers,
Oleg