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| author | Richard Henderson <rth@cygnus.com> | 1999-09-08 16:42:18 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 1999-09-08 16:42:18 -0700 |
| commit | 9831d6406274d4bfbdf0106976718ac08b472dd9 (patch) | |
| tree | 01131e6136aef32fd853c3e9f7a9176a62fd99c5 /gcc | |
| parent | b6b4c6c6f9aef8cdcf37eb3c2518eff0b68a787f (diff) | |
| download | gcc-9831d6406274d4bfbdf0106976718ac08b472dd9.zip gcc-9831d6406274d4bfbdf0106976718ac08b472dd9.tar.gz gcc-9831d6406274d4bfbdf0106976718ac08b472dd9.tar.bz2 | |
* flow.c (new_insn_dead_notes): Don't early out for preexisting regs.
From-SVN: r29217
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/flow.c | 13 |
2 files changed, 17 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index abf7806..8f47f95 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 @@ -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 |