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tree-ssa-operands.c (build_ssa_operands): Update leading comment.

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* tree-ssa-operands.c (build_ssa_operands): Update leading comment.

From-SVN: r108512
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Sebastian Pop 2005-12-14 15:20:55 +01:00 committed by Sebastian Pop
parent 5216df748a
commit d14c5160c1
2 changed files with 5 additions and 21 deletions
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gcc/ChangeLog
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@ -1,3 +1,7 @@
2005-12-14 Sebastian Pop <pop@cri.ensmp.fr>
* tree-ssa-operands.c (build_ssa_operands): Update leading comment.
2005-12-14 J"orn Rennecke <joern.rennecke@st.com>
* struct-equiv.c (rtx_equiv_p): Allow arbitrary RVALUE values for

22
gcc/tree-ssa-operands.c
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@ -791,27 +791,7 @@ parse_ssa_operands (tree stmt)
}
}
/* Create an operands cache for STMT, returning it in NEW_OPS. OLD_OPS are the
original operands, and if ANN is non-null, appropriate stmt flags are set
in the stmt's annotation. If ANN is NULL, this is not considered a "real"
stmt, and none of the operands will be entered into their respective
immediate uses tables. This is to allow stmts to be processed when they
are not actually in the CFG.
Note that some fields in old_ops may change to NULL, although none of the
memory they originally pointed to will be destroyed. It is appropriate
to call free_stmt_operands() on the value returned in old_ops.
The rationale for this: Certain optimizations wish to examine the difference
between new_ops and old_ops after processing. If a set of operands don't
change, new_ops will simply assume the pointer in old_ops, and the old_ops
pointer will be set to NULL, indicating no memory needs to be cleared.
Usage might appear something like:
old_ops_copy = old_ops = stmt_ann(stmt)->operands;
build_ssa_operands (stmt, NULL, &old_ops, &new_ops);
<* compare old_ops_copy and new_ops *>
free_ssa_operands (old_ops); */
/* Create an operands cache for STMT. */
static void
build_ssa_operands (tree stmt)