diff options
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 4101f613f82..e660a3f65a1 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -112,6 +112,7 @@ struct init_expmed_rtl struct rtx_def shift_add; rtunion shift_add_fld1; struct rtx_def shift_sub0; rtunion shift_sub0_fld1; struct rtx_def shift_sub1; rtunion shift_sub1_fld1; + struct rtx_def convert; rtx pow2[MAX_BITS_PER_WORD]; rtx cint[MAX_BITS_PER_WORD]; @@ -122,6 +123,7 @@ init_expmed_one_mode (struct init_expmed_rtl *all, enum machine_mode mode, int speed) { int m, n, mode_bitsize; + enum machine_mode mode_from; mode_bitsize = GET_MODE_UNIT_BITSIZE (mode); @@ -139,6 +141,7 @@ init_expmed_one_mode (struct init_expmed_rtl *all, PUT_MODE (&all->shift_add, mode); PUT_MODE (&all->shift_sub0, mode); PUT_MODE (&all->shift_sub1, mode); + PUT_MODE (&all->convert, mode); add_cost[speed][mode] = set_src_cost (&all->plus, speed); neg_cost[speed][mode] = set_src_cost (&all->neg, speed); @@ -183,6 +186,30 @@ init_expmed_one_mode (struct init_expmed_rtl *all, mul_highpart_cost[speed][mode] = set_src_cost (&all->wide_trunc, speed); } + + for (mode_from = GET_CLASS_NARROWEST_MODE (MODE_INT); + mode_from != VOIDmode; + mode_from = GET_MODE_WIDER_MODE (mode_from)) + if (mode != mode_from) + { + unsigned short size_to = GET_MODE_SIZE (mode); + unsigned short size_from = GET_MODE_SIZE (mode_from); + if (size_to < size_from) + { + PUT_CODE (&all->convert, TRUNCATE); + PUT_MODE (&all->reg, mode_from); + set_convert_cost (mode, mode_from, speed, + set_src_cost (&all->convert, speed)); + } + else if (size_from < size_to) + { + /* Assume cost of zero-extend and sign-extend is the same. */ + PUT_CODE (&all->convert, ZERO_EXTEND); + PUT_MODE (&all->reg, mode_from); + set_convert_cost (mode, mode_from, speed, + set_src_cost (&all->convert, speed)); + } + } } } @@ -262,6 +289,9 @@ init_expmed (void) XEXP (&all.shift_sub1, 0) = &all.reg; XEXP (&all.shift_sub1, 1) = &all.shift_mult; + PUT_CODE (&all.convert, TRUNCATE); + XEXP (&all.convert, 0) = &all.reg; + for (speed = 0; speed < 2; speed++) { crtl->maybe_hot_insn_p = speed; @@ -3262,6 +3292,24 @@ expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target, return op0; } +/* Return a cost estimate for multiplying a register by the given + COEFFicient in the given MODE and SPEED. */ + +int +mult_by_coeff_cost (HOST_WIDE_INT coeff, enum machine_mode mode, bool speed) +{ + int max_cost; + struct algorithm algorithm; + enum mult_variant variant; + + rtx fake_reg = gen_raw_REG (mode, LAST_VIRTUAL_REGISTER + 1); + max_cost = set_src_cost (gen_rtx_MULT (mode, fake_reg, fake_reg), speed); + if (choose_mult_variant (mode, coeff, &algorithm, &variant, max_cost)) + return algorithm.cost.cost; + else + return max_cost; +} + /* Perform a widening multiplication and return an rtx for the result. MODE is mode of value; OP0 and OP1 are what to multiply (rtx's); TARGET is a suggestion for where to store the result (an rtx). |