tree-ssa-alias.c (compute_flow_insensitive_aliasing): Reduce the number of queries to random elements in the ai->written_vars bitmap.
* tree-ssa-alias.c (compute_flow_insensitive_aliasing): Reduce the number of queries to random elements in the ai->written_vars bitmap. From-SVN: r91271
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@ -1,3 +1,9 @@
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2004-11-24 Jeff Law <law@redhat.com>
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* tree-ssa-alias.c (compute_flow_insensitive_aliasing): Reduce
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the number of queries to random elements in the ai->written_vars
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bitmap.
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2004-11-24 Roger Sayle <roger@eyesopen.com>
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* config/i386/i386.c (override_options): Disable x87 fancy math
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@ -921,11 +921,16 @@ compute_flow_insensitive_aliasing (struct alias_info *ai)
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/* Skip memory tags and variables that have never been
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written to. We also need to check if the variables are
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call-clobbered because they may be overwritten by
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function calls. */
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tag_stored_p = bitmap_bit_p (ai->written_vars, tag_ann->uid)
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|| is_call_clobbered (tag);
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var_stored_p = bitmap_bit_p (ai->written_vars, v_ann->uid)
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|| is_call_clobbered (var);
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function calls.
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Note this is effectively random accessing elements in
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the sparse bitset, which can be highly inefficient.
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So we first check the call_clobbered status of the
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tag and variable before querying the bitmap. */
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tag_stored_p = is_call_clobbered (tag)
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|| bitmap_bit_p (ai->written_vars, tag_ann->uid);
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var_stored_p = is_call_clobbered (var)
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|| bitmap_bit_p (ai->written_vars, v_ann->uid);
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if (!tag_stored_p && !var_stored_p)
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continue;
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