OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

* flow.c (new_insn_dead_notes): Don't early out for preexisting regs.

Browse Source 
From-SVN: r29217
This commit is contained in:
Richard Henderson 1999-09-08 16:42:18 -07:00 committed by Richard Henderson
parent b6b4c6c6f9
commit 9831d64062
2 changed files with 17 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
gcc/ChangeLog
View File

@ -1,3 +1,7 @@
Wed Sep 8 16:41:27 1999 Richard Henderson <rth@cygnus.com>
* flow.c (new_insn_dead_notes): Don't early out for preexisting regs.
Wed Sep 8 16:07:52 1999 Richard Henderson <rth@cygnus.com>
* gengenrtl.c (CONST_DOUBLE_FORMAT): Take the size REAL_ARITHMETIC

13
gcc/flow.c
View File

@ -5351,6 +5351,7 @@ new_insn_dead_notes (pat, insn, first, last, orig_first_insn, orig_last_insn)
if (GET_CODE (dest) == REG)
{
#if 0
/* If the original insns already used this register, we may not
add new notes for it. One example for a replacement that
needs this test is when a multi-word memory access with
@ -5370,6 +5371,17 @@ new_insn_dead_notes (pat, insn, first, last, orig_first_insn, orig_last_insn)
REG_DEAD notes. This can probably be accurately done by
calling mark_referenced_resources() on the old stream before
replacing the old insns. */
/* ??? The conclusion reached here -- that we can't add DEAD notes
when the register is preexisting -- is false. I can't envision
a sequence postulated above that wouldn't be properly handled
by the code below. In the meantime, consider the 1->2 split
(set (reg:SI 100) (ne:SI (reg:SI 100) (const_int 0)))
to
(set (reg:CC icc) (compare:CC (reg:SI 100) (const_int 0)))
(set (reg:SI 100) (ne:SI (reg:CC icc) (const_int 0)))
We do in fact need a new DEAD note on the first insn for reg 100. */
for (tem = orig_first_insn; tem != NULL_RTX; tem = NEXT_INSN (tem))
{
@ -5379,6 +5391,7 @@ new_insn_dead_notes (pat, insn, first, last, orig_first_insn, orig_last_insn)
if (tem == orig_last_insn)
break;
}
#endif
/* So it's a new register, presumably only used within this
group of insns. Find the last insn in the set of new insns