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| author | Richard Kenner <kenner@gcc.gnu.org> | 1992-07-04 13:59:44 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1992-07-04 13:59:44 -0400 |
| commit | cc8765963d50329c6795b728b44514020b23b5d6 (patch) | |
| tree | bfbd5172444b3212a53c044f3f7fed85b2b6d19d | |
| parent | 0093e75b01730b9688f299e3abb6bf2703c96142 (diff) | |
| download | gcc-cc8765963d50329c6795b728b44514020b23b5d6.zip gcc-cc8765963d50329c6795b728b44514020b23b5d6.tar.gz gcc-cc8765963d50329c6795b728b44514020b23b5d6.tar.bz2 | |
*** empty log message ***
From-SVN: r1428
| -rw-r--r-- | gcc/combine.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 922e6c6..5e6a183 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -302,17 +302,20 @@ struct undobuf static struct undobuf undobuf; -/* Substitute NEWVAL, an rtx expression, into INTO, a place in a some +/* Substitute NEWVAL, an rtx expression, into INTO, a place in some insn. The substitution can be undone by undo_all. If INTO is already - set to NEWVAL, do not record this change. */ + set to NEWVAL, do not record this change. Because computing NEWVAL might + also call SUBST, we have to compute it before we put anything into + the undo table. */ #define SUBST(INTO, NEWVAL) \ - do { if (undobuf.num_undo < MAX_UNDO) \ + do { rtx _new = (NEWVAL); \ + if (undobuf.num_undo < MAX_UNDO) \ { \ undobuf.undo[undobuf.num_undo].where = &INTO; \ undobuf.undo[undobuf.num_undo].old_contents = INTO; \ undobuf.undo[undobuf.num_undo].is_int = 0; \ - INTO = NEWVAL; \ + INTO = _new; \ if (undobuf.undo[undobuf.num_undo].old_contents != INTO) \ undobuf.num_undo++; \ } \ |