diff options
| author | Ian Lance Taylor <ian@airs.com> | 2005-03-23 15:59:40 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2005-03-23 15:59:40 +0000 |
| commit | 17ac08e2fb86675af83171afbeccfe7936c48709 (patch) | |
| tree | 1d2e8d636e2d097fbbf7d8d91bff95a8cd0968e0 /gcc | |
| parent | 0e6b0dafa31335e74c230356f71d0356089a3a3f (diff) | |
| download | gcc-17ac08e2fb86675af83171afbeccfe7936c48709.zip gcc-17ac08e2fb86675af83171afbeccfe7936c48709.tar.gz gcc-17ac08e2fb86675af83171afbeccfe7936c48709.tar.bz2 | |
final.c (final_scan_insn): Don't remove no-op instructions.
* final.c (final_scan_insn): Don't remove no-op instructions.
* reload1.c (reload): Remove simple no-op instructions even when
not optimizing.
From-SVN: r96933
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/final.c | 17 | ||||
| -rw-r--r-- | gcc/reload1.c | 13 |
3 files changed, 21 insertions, 15 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 223b673..36c07b8 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2005-03-23 Ian Lance Taylor <ian@airs.com> + + * final.c (final_scan_insn): Don't remove no-op instructions. + * reload1.c (reload): Remove simple no-op instructions even when + not optimizing. + 2005-03-23 Dorit Naishlos <dorit@il.ib.com> PR tree-optimization/20501 diff --git a/gcc/final.c b/gcc/final.c index 9347efe..906e50c 100644 --- a/gcc/final.c +++ b/gcc/final.c @@ -1,6 +1,7 @@ /* Convert RTL to assembler code and output it, for GNU compiler. Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, - 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. + 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 + Free Software Foundation, Inc. This file is part of GCC. @@ -2267,20 +2268,6 @@ final_scan_insn (rtx insn, FILE *file, int optimize ATTRIBUTE_UNUSED, } #endif -#ifndef STACK_REGS - /* Don't bother outputting obvious no-ops, even without -O. - This optimization is fast and doesn't interfere with debugging. - Don't do this if the insn is in a delay slot, since this - will cause an improper number of delay insns to be written. */ - if (final_sequence == 0 - && prescan >= 0 - && NONJUMP_INSN_P (insn) && GET_CODE (body) == SET - && REG_P (SET_SRC (body)) - && REG_P (SET_DEST (body)) - && REGNO (SET_SRC (body)) == REGNO (SET_DEST (body))) - break; -#endif - #ifdef HAVE_cc0 /* If this is a conditional branch, maybe modify it if the cc's are in a nonstandard state diff --git a/gcc/reload1.c b/gcc/reload1.c index 41a2f02..5e1ab1a 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -1174,6 +1174,19 @@ reload (rtx first, int global) replace_pseudos_in (& XEXP (PATTERN (insn), 0), VOIDmode, PATTERN (insn)); + /* Discard obvious no-ops, even without -O. This optimization + is fast and doesn't interfere with debugging. */ + if (NONJUMP_INSN_P (insn) + && GET_CODE (PATTERN (insn)) == SET + && REG_P (SET_SRC (PATTERN (insn))) + && REG_P (SET_DEST (PATTERN (insn))) + && (REGNO (SET_SRC (PATTERN (insn))) + == REGNO (SET_DEST (PATTERN (insn))))) + { + delete_insn (insn); + continue; + } + pnote = ®_NOTES (insn); while (*pnote != 0) { |