diff options
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 17a9af7a582..2f656c281f1 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -93,9 +93,10 @@ init_expmed () /* Since we are on the permanent obstack, we must be sure we save this spot AFTER we call start_sequence, since it will reuse the rtl it makes. */ - free_point = (char *) oballoc (0); + reg = gen_rtx (REG, word_mode, 10000); + zero_cost = rtx_cost (const0_rtx, 0); add_cost = rtx_cost (gen_rtx_PLUS (word_mode, reg, reg), SET); @@ -2277,7 +2278,8 @@ expand_mult (mode, op0, op1, target, unsignedp) rtx shift_subtarget = preserve ? 0 : accum; rtx add_target = (opno == alg.ops - 1 && target != 0 && variant != add_variant - ? target : 0); + && ! preserve) + ? target : 0; rtx accum_target = preserve ? 0 : accum; switch (alg.op[opno]) @@ -2746,6 +2748,7 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp) optab optab1, optab2; int op1_is_constant, op1_is_pow2; int max_cost, extra_cost; + static HOST_WIDE_INT last_div_const = 0; op1_is_constant = GET_CODE (op1) == CONST_INT; op1_is_pow2 = (op1_is_constant @@ -2855,8 +2858,15 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp) size = GET_MODE_BITSIZE (mode); #endif + /* Only deduct something for a REM if the last divide done was + for a different constant. Then set the constant of the last + divide. */ max_cost = div_cost[(int) compute_mode] - - (rem_flag ? mul_cost[(int) compute_mode] + add_cost : 0); + - (rem_flag && ! (last_div_const != 0 && op1_is_constant + && INTVAL (op1) == last_div_const) + ? mul_cost[(int) compute_mode] + add_cost : 0); + + last_div_const = ! rem_flag && op1_is_constant ? INTVAL (op1) : 0; /* Now convert to the best mode to use. */ if (compute_mode != mode) |