diff options
Diffstat (limited to 'gcc/lra-constraints.c')
| -rw-r--r-- | gcc/lra-constraints.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c index 4d98624..9440205 100644 --- a/gcc/lra-constraints.c +++ b/gcc/lra-constraints.c @@ -2685,6 +2685,21 @@ 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) + { + if (lra_dump_file != NULL) + fprintf + (lra_dump_file, + " Using memory insn operand %d: reject+=3\n", + nop); + reject += 3; + } + #ifdef SECONDARY_MEMORY_NEEDED /* If reload requires moving value through secondary memory, it will need one more insn at least. */ |