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| author | Richard Kenner <kenner@gcc.gnu.org> | 1992-08-17 07:34:23 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1992-08-17 07:34:23 -0400 |
| commit | 2c414fba8efe097c221d1f643404ae1b753720ac (patch) | |
| tree | 2be9f00ca70dcb2322341e438e7cebc4c7aac7d1 /gcc | |
| parent | 05c0fbb8bcbee55bf0b21bd1eb8201f2fda07240 (diff) | |
| download | gcc-2c414fba8efe097c221d1f643404ae1b753720ac.zip gcc-2c414fba8efe097c221d1f643404ae1b753720ac.tar.gz gcc-2c414fba8efe097c221d1f643404ae1b753720ac.tar.bz2 | |
(expand_mult): Bound second synth_mult cost by cost of algorithm from
first call.
(expand_divmod): When doing logical operations, the size of
COMPUTE_MODE should be used, not MODE.
From-SVN: r1869
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/expmed.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 5b6ed4d..2534f57 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -1982,7 +1982,8 @@ expand_mult (mode, op0, op1, target, unsignedp) alg = synth_mult (absval, add_cost, shift_cost, mult_cost); neg_alg = synth_mult (- absval, add_cost, shift_cost, - mult_cost - negate_cost); + (alg.cost >= 0 ? alg.cost : mult_cost) + - negate_cost); if (neg_alg.cost >= 0 && neg_alg.cost + negate_cost < alg.cost) alg = neg_alg, negate = 1, absval = - absval; @@ -2151,6 +2152,7 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp) register rtx result = 0; enum machine_mode compute_mode; int log = -1; + int size; int can_clobber_op0; int mod_insn_no_good = 0; rtx adjusted_op0 = op0; @@ -2247,6 +2249,8 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp) if (compute_mode == VOIDmode) compute_mode = mode; + size = GET_MODE_BITSIZE (compute_mode); + /* Now convert to the best mode to use. Show we made a copy of OP0 and hence we can clobber it (we cannot use a SUBREG to widen something. */ @@ -2299,8 +2303,7 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp) temp = expand_shift (RSHIFT_EXPR, compute_mode, temp, build_int_2 (log - 1, 0), NULL_RTX, 0); temp = expand_shift (RSHIFT_EXPR, compute_mode, temp, - build_int_2 (GET_MODE_BITSIZE (mode) - log, - 0), + build_int_2 (size - log, 0), temp, 1); expand_inc (adjusted_op0, temp); } @@ -2398,7 +2401,7 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp) rtx temp = gen_reg_rtx (compute_mode); temp = copy_to_suggested_reg (adjusted_op0, temp, compute_mode); temp = expand_shift (RSHIFT_EXPR, compute_mode, temp, - build_int_2 (GET_MODE_BITSIZE (mode) - 1, 0), + build_int_2 (size - 1, 0), NULL_RTX, 0); op1 = expand_binop (compute_mode, xor_optab, op1, temp, op1, unsignedp, OPTAB_LIB_WIDEN); |