https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95740
Hongtao.liu <crazylht at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |crazylht at gmail dot com
--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
Increase constraints preference and reduce sse->integer move cost can't help
it.
----
modified gcc/config/i386/i386.md
@@ -2294,9 +2294,9 @@
(define_insn "*movsi_internal"
[(set (match_operand:SI 0 "nonimmediate_operand"
- "=r,m ,*y,*y,?*y,?m,?r,?*y,*v,*v,*v,m ,?r,?*v,*k,*k ,*rm,*k")
+ "=r,m ,*y,*y,?*y,?m,?r,?*y,*v,*v,*v,r ,m,?*v,*k,*k ,*rm,*k")
(match_operand:SI 1 "general_operand"
- "g ,re,C ,*y,m ,*y,*y,r ,C ,*v,m ,*v,*v,r ,*r,*km,*k ,CBC"))]
+ "g ,re,C ,*y,m ,*y,*y,r ,C ,*v,m ,v,*v,r ,*r,*km,*k ,CBC"))]
"!(MEM_P (operands[0]) && MEM_P (operands[1]))"
{
switch (get_attr_type (insn))
modified gcc/config/i386/x86-tune-costs.h
@@ -1624,7 +1624,7 @@ struct processor_costs skylake_cost = {
in 32,64,128,256 and 512-bit */
{8, 8, 8, 12, 24}, /* cost of storing SSE registers
in 32,64,128,256 and 512-bit */
- 6, 6, /* SSE->integer and
integer->SSE moves */
+ 2, 2, /* SSE->integer and
integer->SSE moves */
------
It seems to me for insn inserted reloaded before
18: r89:SI=r87:SF#0
(insn 18 16 6 2 (set (reg:SI 89)
(subreg:SI (reg:SF 87) 0))
LRA prefer to put reg:SI 89 into memory since it would be used later.
