diff options
Diffstat (limited to 'gcc/config/i386/i386.c')
| -rw-r--r-- | gcc/config/i386/i386.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index d01733d..b707623 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -12125,13 +12125,21 @@ ix86_adjust_cost (insn, link, dep_insn, cost) if ((memory == MEMORY_LOAD || memory == MEMORY_BOTH) && !ix86_agi_dependant (insn, dep_insn, insn_type)) { - /* Claim moves to take one cycle, as core can issue one load - at time and the next load can start cycle later. */ - if (dep_insn_type == TYPE_IMOV - || dep_insn_type == TYPE_FMOV) - cost = 0; - else if (cost >= 3) - cost -= 3; + enum attr_unit unit = get_attr_unit (insn); + int loadcost = 3; + + /* Because of the difference between the length of integer and + floating unit pipeline preparation stages, the memory operands + for floating point are cheaper. + + ??? For Athlon it the difference is most propbably 2. */ + if (unit == UNIT_INTEGER || unit == UNIT_UNKNOWN) + loadcost = 3; + else + loadcost = TARGET_ATHLON ? 2 : 0; + + if (cost >= loadcost) + cost -= loadcost; else cost = 0; } |