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Bug fixed in optimizing two adjacent basic blocks.

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This commit is contained in:
bal 1984-12-07 14:19:53 +00:00
parent af75a28622
commit 9019141137
1 changed files with 8 additions and 5 deletions
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13
util/ego/cs/cs.c
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@ -1,3 +1,4 @@
/* C O M M O N S U B E X P R E S S I O N E L I M I N A T I O N */
@ -41,17 +42,19 @@ STATIC cs_optimize(p)
rbp = p->p_start;
while (rbp != (bblock_p) 0) {
bdone = rbp->b_idom;
/* First we build a list of common expressions with the
* value numbering algorithm. We take blocks in textual order
* as long as the next block can only be reached through the
* block we have just done.
* block we have just done. Note that if a block is preceded
* by itself, the number of predecessors is greater than 1,
* but the previous block can still be its immediate dominator.
*/
while (rbp != (bblock_p) 0 && rbp->b_idom == bdone) {
vnm(rbp); bdone = rbp;
do { vnm(rbp); bdone = rbp;
OUTTRACE("basic block %d processed", bdone->b_id);
rbp = rbp->b_next;
}
} while (rbp != (bblock_p) 0 && rbp->b_idom == bdone &&
Lnrelems(rbp->b_pred) == 1
);
OUTTRACE("value numbering completed", 0);
OUTAVAILS(); OUTENTITIES();