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| author | Torbjorn Granlund <tege@gnu.org> | 1994-07-05 23:19:00 +0000 |
|---|---|---|
| committer | Torbjorn Granlund <tege@gnu.org> | 1994-07-05 23:19:00 +0000 |
| commit | 9176af2fd89edcabb118a3993fe49623a2c7255d (patch) | |
| tree | 08f6ca9bfa8811b75db3c83d0b7c08fe5411b660 /gcc | |
| parent | cd5e8f1fc2a2a1934591a15b27005821886db768 (diff) | |
| download | gcc-9176af2fd89edcabb118a3993fe49623a2c7255d.zip gcc-9176af2fd89edcabb118a3993fe49623a2c7255d.tar.gz gcc-9176af2fd89edcabb118a3993fe49623a2c7255d.tar.bz2 | |
(expand_divmod): Fix typo setting op1_is_pow2.
(expand_divmod): Handle powers-of-two specifically for CEIL_*_EXPR.
From-SVN: r7658
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/expmed.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index a57992e..f828e7f 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -2560,8 +2560,9 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp) int op1_is_constant, op1_is_pow2; op1_is_constant = GET_CODE (op1) == CONST_INT; - op1_is_pow2 = (EXACT_POWER_OF_2_OR_ZERO_P (INTVAL (op1)) - || EXACT_POWER_OF_2_OR_ZERO_P (-INTVAL (op1))); + op1_is_pow2 = (op1_is_constant + && ((EXACT_POWER_OF_2_OR_ZERO_P (INTVAL (op1)) + || EXACT_POWER_OF_2_OR_ZERO_P (-INTVAL (op1))))); /* This is the structure of expand_divmod: @@ -3112,6 +3113,24 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp) case CEIL_MOD_EXPR: if (unsignedp) { + if (op1_is_constant && EXACT_POWER_OF_2_OR_ZERO_P (INTVAL (op1))) + { + rtx t1, t2, t3; + unsigned HOST_WIDE_INT d = INTVAL (op1); + t1 = expand_shift (RSHIFT_EXPR, compute_mode, op0, + build_int_2 (floor_log2 (d), 0), + NULL_RTX, 1); + t2 = expand_binop (compute_mode, and_optab, op0, + GEN_INT (d - 1), + NULL_RTX, 1, OPTAB_LIB_WIDEN); + t3 = gen_reg_rtx (compute_mode); + t3 = emit_store_flag (t3, NE, t2, const0_rtx, + compute_mode, 1, 1); + quotient = force_operand (gen_rtx (PLUS, compute_mode, + t1, t3), + tquotient); + break; + } /* Try using an instruction that produces both the quotient and remainder, using truncation. We can easily compensate the |