diff options
Diffstat (limited to 'gcc/alias.c')
| -rw-r--r-- | gcc/alias.c | 53 |
1 files changed, 46 insertions, 7 deletions
diff --git a/gcc/alias.c b/gcc/alias.c index c528fcf..4969aa6 100644 --- a/gcc/alias.c +++ b/gcc/alias.c @@ -156,6 +156,10 @@ static GTY((length ("reg_base_value_size"))) rtx *reg_base_value; static rtx *new_reg_base_value; static unsigned int reg_base_value_size; /* size of reg_base_value array */ +/* Static hunks of RTL used by the aliasing code; these are initialized + once per function to avoid unnecessary RTL allocations. */ +static GTY (()) rtx static_reg_base_value[FIRST_PSEUDO_REGISTER]; + #define REG_BASE_VALUE(X) \ (REGNO (X) < reg_base_value_size \ ? reg_base_value[REGNO (X)] : 0) @@ -2638,6 +2642,43 @@ init_alias_once () alias_sets = splay_tree_new (splay_tree_compare_ints, 0, 0); } +/* Per-function initializer for the aliasing code. + + Allocate RTL for argument and other special use registers once + per function here intead of multiple times per function in + init_alias_analysis. */ + +void +init_alias_once_per_function () +{ + int i; + + /* Generate and mark all hard registers which may contain an address. + The stack, frame and argument pointers may contain an address. + An argument register which can hold a Pmode value may contain + an address even if it is not in BASE_REGS. + + The address expression is VOIDmode for an argument and + Pmode for other registers. */ + + for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) + if (TEST_HARD_REG_BIT (argument_registers, i)) + static_reg_base_value[i] + = gen_rtx_ADDRESS (VOIDmode, gen_rtx_REG (Pmode, i)); + + + static_reg_base_value[STACK_POINTER_REGNUM] + = gen_rtx_ADDRESS (Pmode, stack_pointer_rtx); + static_reg_base_value[ARG_POINTER_REGNUM] + = gen_rtx_ADDRESS (Pmode, arg_pointer_rtx); + static_reg_base_value[FRAME_POINTER_REGNUM] + = gen_rtx_ADDRESS (Pmode, frame_pointer_rtx); +#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM + static_reg_base_value[HARD_FRAME_POINTER_REGNUM] + = gen_rtx_ADDRESS (Pmode, hard_frame_pointer_rtx); +#endif +} + /* Initialize the aliasing machinery. Initialize the REG_KNOWN_VALUE array. */ @@ -2725,20 +2766,18 @@ init_alias_analysis () for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) if (TEST_HARD_REG_BIT (argument_registers, i)) - new_reg_base_value[i] = gen_rtx_ADDRESS (VOIDmode, - gen_rtx_REG (Pmode, i)); + new_reg_base_value[i] = static_reg_base_value[i]; new_reg_base_value[STACK_POINTER_REGNUM] - = gen_rtx_ADDRESS (Pmode, stack_pointer_rtx); + = static_reg_base_value[STACK_POINTER_REGNUM]; new_reg_base_value[ARG_POINTER_REGNUM] - = gen_rtx_ADDRESS (Pmode, arg_pointer_rtx); + = static_reg_base_value[ARG_POINTER_REGNUM]; new_reg_base_value[FRAME_POINTER_REGNUM] - = gen_rtx_ADDRESS (Pmode, frame_pointer_rtx); + = static_reg_base_value[FRAME_POINTER_REGNUM]; #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM new_reg_base_value[HARD_FRAME_POINTER_REGNUM] - = gen_rtx_ADDRESS (Pmode, hard_frame_pointer_rtx); + = static_reg_base_value[HARD_FRAME_POINTER_REGNUM]; #endif - /* Walk the insns adding values to the new_reg_base_value array. */ for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) { |