diff options
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/i386/x86-tune-sched.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/gcc/config/i386/x86-tune-sched.c b/gcc/config/i386/x86-tune-sched.c index 51fa77c..aac2bae 100644 --- a/gcc/config/i386/x86-tune-sched.c +++ b/gcc/config/i386/x86-tune-sched.c @@ -352,7 +352,6 @@ ix86_adjust_cost (rtx_insn *insn, int dep_type, rtx_insn *dep_insn, int cost, case PROCESSOR_BDVER2: case PROCESSOR_BDVER3: case PROCESSOR_BDVER4: - case PROCESSOR_ZNVER1: case PROCESSOR_BTVER1: case PROCESSOR_BTVER2: case PROCESSOR_GENERIC: @@ -392,6 +391,35 @@ ix86_adjust_cost (rtx_insn *insn, int dep_type, rtx_insn *dep_insn, int cost, } break; + case PROCESSOR_ZNVER1: + /* Stack engine allows to execute push&pop instructions in parall. */ + if ((insn_type == TYPE_PUSH || insn_type == TYPE_POP) + && (dep_insn_type == TYPE_PUSH || dep_insn_type == TYPE_POP)) + return 0; + + memory = get_attr_memory (insn); + + /* Show ability of reorder buffer to hide latency of load by executing + in parallel with previous instruction in case + previous instruction is not needed to compute the address. */ + if ((memory == MEMORY_LOAD || memory == MEMORY_BOTH) + && !ix86_agi_dependent (dep_insn, insn)) + { + enum attr_unit unit = get_attr_unit (insn); + int loadcost; + + if (unit == UNIT_INTEGER || unit == UNIT_UNKNOWN) + loadcost = 4; + else + loadcost = 7; + + if (cost >= loadcost) + cost -= loadcost; + else + cost = 0; + } + break; + case PROCESSOR_CORE2: case PROCESSOR_NEHALEM: case PROCESSOR_SANDYBRIDGE: |