re PR rtl-optimization/70478 ([LRA] S/390: Performance regression - superfluous stack frame)
2017-04-11 Vladimir Makarov <vmakarov@redhat.com> PR rtl-optimization/70478 * lra-constraints.c (process_alt_operands): Check memory for disfavoring memory insn operand. From-SVN: r246854
This commit is contained in:
parent
df1c878ec2
commit
4796d8f620
|
@ -1,3 +1,9 @@
|
|||
2017-04-11 Vladimir Makarov <vmakarov@redhat.com>
|
||||
|
||||
PR rtl-optimization/70478
|
||||
* lra-constraints.c (process_alt_operands): Check memory for
|
||||
disfavoring memory insn operand.
|
||||
|
||||
2017-04-11 Jakub Jelinek <jakub@redhat.com>
|
||||
|
||||
PR middle-end/80100
|
||||
|
|
|
@ -2722,12 +2722,14 @@ process_alt_operands (int only_alternative)
|
|||
}
|
||||
}
|
||||
|
||||
/* When we use memory operand, the insn should read the
|
||||
value from memory and even if we just wrote a value
|
||||
into the memory it is costly in comparison with an
|
||||
insn alternative which does not use memory
|
||||
(e.g. register or immediate operand). */
|
||||
if (no_regs_p && offmemok)
|
||||
/* When we use an operand requiring memory in given
|
||||
alternative, the insn should write *and* read the
|
||||
value to/from memory it is costly in comparison with
|
||||
an insn alternative which does not use memory
|
||||
(e.g. register or immediate operand). We exclude
|
||||
memory operand for such case as we can satisfy the
|
||||
memory constraints by reloading address. */
|
||||
if (no_regs_p && offmemok && !MEM_P (op))
|
||||
{
|
||||
if (lra_dump_file != NULL)
|
||||
fprintf
|
||||
|
|
Loading…
Reference in New Issue