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* mode-switching.c: Make small adjustments to the top comment.

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From-SVN: r208892
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Eric Botcazou 2014-03-28 10:20:41 +00:00 committed by Eric Botcazou
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2 changed files with 9 additions and 5 deletions
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gcc/ChangeLog
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@ -1,3 +1,7 @@
2014-03-28 Eric Botcazou <ebotcazou@adacore.com>
* mode-switching.c: Make small adjustments to the top comment.
2014-03-27 Michael Meissner <meissner@linux.vnet.ibm.com>
* config/rs6000/constraints.md (wD constraint): New constraint to

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gcc/mode-switching.c
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@ -45,20 +45,20 @@ along with GCC; see the file COPYING3. If not see
and finding all the insns which require a specific mode. Each insn gets
a unique struct seginfo element. These structures are inserted into a list
for each basic block. For each entity, there is an array of bb_info over
the flow graph basic blocks (local var 'bb_info'), and contains a list
the flow graph basic blocks (local var 'bb_info'), which contains a list
of all insns within that basic block, in the order they are encountered.
For each entity, any basic block WITHOUT any insns requiring a specific
mode are given a single entry, without a mode. (Each basic block
in the flow graph must have at least one entry in the segment table.)
mode are given a single entry without a mode (each basic block in the
flow graph must have at least one entry in the segment table).
The LCM algorithm is then run over the flow graph to determine where to
place the sets to the highest-priority value in respect of first the first
place the sets to the highest-priority mode with respect to the first
insn in any one block. Any adjustments required to the transparency
vectors are made, then the next iteration starts for the next-lower
priority mode, till for each entity all modes are exhausted.
More details are located in the code for optimize_mode_switching(). */
More details can be found in the code of optimize_mode_switching. */
/* This structure contains the information for each insn which requires
either single or double mode to be set.