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final.c (final_scan_insn): Don't remove no-op instructions.

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* 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
This commit is contained in:
Ian Lance Taylor 2005-03-23 15:59:40 +00:00 committed by Ian Lance Taylor
parent 0e6b0dafa3
commit 17ac08e2fb
3 changed files with 21 additions and 15 deletions
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6
gcc/ChangeLog
View File

@ -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

17
gcc/final.c
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@ -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

13
gcc/reload1.c
View File

@ -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 = &REG_NOTES (insn);
while (*pnote != 0)
{