Hi Oleg,
On Sun, May 01, 2016 at 12:40:15PM +0900, Oleg Endo wrote:
> The attached patch mainly simplifies some of the predicates. There is
> no functional change, except the removal of the "mov_nop" pattern,
> which resulted in a few +- 4/8 byte code size changes in the CSiBE set,
> which look like register allocation choices. But not sure what the
> original purpose or intention of that pattern was...
A long time ago (1998) there was
/* We need something to tag possible REG_LIBCALL notes on to. */
if (TARGET_FPU_SINGLE && rtx_equal_function_value_matters
&& GET_CODE (operands[0]) == REG)
emit_insn (gen_mov_nop (operands[0]));
(in movdf, movsf) but this was removed in 2000 already.
Segher
