diff options
Diffstat (limited to 'gcc/config/i386/i386.cc')
| -rw-r--r-- | gcc/config/i386/i386.cc | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc index f38e3db..b172f71 100644 --- a/gcc/config/i386/i386.cc +++ b/gcc/config/i386/i386.cc @@ -458,6 +458,9 @@ int ix86_arch_specified; indirect thunk pushes the return address onto stack, destroying red-zone. + NB: Don't use red-zone for functions with no_caller_saved_registers + and 32 GPRs since 128-byte red-zone is too small for 31 GPRs. + TODO: If we can reserve the first 2 WORDs, for PUSH and, another for CALL, in red-zone, we can allow local indirect jumps with indirect thunk. */ @@ -467,6 +470,9 @@ ix86_using_red_zone (void) { return (TARGET_RED_ZONE && !TARGET_64BIT_MS_ABI + && (!TARGET_APX_EGPR + || (cfun->machine->call_saved_registers + != TYPE_NO_CALLER_SAVED_REGISTERS)) && (!cfun->machine->has_local_indirect_jump || cfun->machine->indirect_branch_type == indirect_branch_keep)); } @@ -21883,7 +21889,11 @@ ix86_rtx_costs (rtx x, machine_mode mode, int outer_code_i, int opno, case SYMBOL_REF: if (x86_64_immediate_operand (x, VOIDmode)) *total = 0; - else + else if (TARGET_64BIT && x86_64_zext_immediate_operand (x, VOIDmode)) + /* Consider the zext constants slightly more expensive, as they + can't appear in most instructions. */ + *total = 1; + else /* movabsq is slightly more expensive than a simple instruction. */ *total = COSTS_N_INSNS (1) + 1; return true; |