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| author | Michael Matz <matz@suse.de> | 2009-12-20 01:15:46 +0000 |
|---|---|---|
| committer | Michael Matz <matz@gcc.gnu.org> | 2009-12-20 01:15:46 +0000 |
| commit | e83f4b68e7d86d97d230aa84ea1a0c71c4b43aac (patch) | |
| tree | 7c4ea5cbc5a0f4f136ef8ca29dd6d5cdacb56c5a /gcc/cfgexpand.c | |
| parent | e72297c57250b6a50d1a1f2b0d1983023c5266c8 (diff) | |
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re PR tree-optimization/42027 (Performance regression in convolution loop optimization)
PR tree-optimization/42027
* cfgexpand.c (expand_gimple_cond): Use jumpy sequence for &, &&, |
and || if jumps are cheap.
From-SVN: r155367
Diffstat (limited to 'gcc/cfgexpand.c')
| -rw-r--r-- | gcc/cfgexpand.c | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c index 08b211e..b0921bf 100644 --- a/gcc/cfgexpand.c +++ b/gcc/cfgexpand.c @@ -1606,13 +1606,35 @@ expand_gimple_cond (basic_block bb, gimple stmt) && bitmap_bit_p (SA.values, SSA_NAME_VERSION (op0))) { gimple second = SSA_NAME_DEF_STMT (op0); - if (gimple_code (second) == GIMPLE_ASSIGN - && TREE_CODE_CLASS (gimple_assign_rhs_code (second)) - == tcc_comparison) + if (gimple_code (second) == GIMPLE_ASSIGN) { - code = gimple_assign_rhs_code (second); - op0 = gimple_assign_rhs1 (second); - op1 = gimple_assign_rhs2 (second); + enum tree_code code2 = gimple_assign_rhs_code (second); + if (TREE_CODE_CLASS (code2) == tcc_comparison) + { + code = code2; + op0 = gimple_assign_rhs1 (second); + op1 = gimple_assign_rhs2 (second); + } + /* If jumps are cheap turn some more codes into + jumpy sequences. */ + else if (BRANCH_COST (optimize_insn_for_speed_p (), false) < 4) + { + if ((code2 == BIT_AND_EXPR + && TYPE_PRECISION (TREE_TYPE (op0)) == 1 + && TREE_CODE (gimple_assign_rhs2 (second)) != INTEGER_CST) + || code2 == TRUTH_AND_EXPR) + { + code = TRUTH_ANDIF_EXPR; + op0 = gimple_assign_rhs1 (second); + op1 = gimple_assign_rhs2 (second); + } + else if (code2 == BIT_IOR_EXPR || code2 == TRUTH_OR_EXPR) + { + code = TRUTH_ORIF_EXPR; + op0 = gimple_assign_rhs1 (second); + op1 = gimple_assign_rhs2 (second); + } + } } } |