diff options
| author | sayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-01-23 02:57:26 +0000 |
|---|---|---|
| committer | sayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-01-23 02:57:26 +0000 |
| commit | c7926a824cfe7ee75d14440282d6d15d83dcd6f8 (patch) | |
| tree | e350e7cda96af13a3c7a7347f5f121cef549541c /gcc/cse.c | |
| parent | 45baea8bdc127498d928bff521be446e7d595dff (diff) | |
| download | gcc-c7926a824cfe7ee75d14440282d6d15d83dcd6f8.tar.gz | |
PR optimization/8423
* cse.c (fold_rtx): Only eliminate a CONSTANT_P_RTX to 1 when
its argument is constant, or 0 if !flag_gcse.
* simplify-rtx.c (simplify_rtx): Convert CONSTANT_P_RTX to 1
if it's argument is constant.
* gcse.c (want_to_gcse_p): Ignore CONSTANT_P_RTX nodes.
(hash_scan_set): Don't record CONSTANT_P_RTX expressions.
(do_local_cprop): Don't propagate CONSTANT_P_RTX constants.
* builtins.c (purge_builtin_constant_p): New function to force
instantiation of any remaining CONSTANT_P_RTX nodes.
* rtl.h (purge_builtin_constant_p): Prototype here.
* toplev.c (rest_of_compilation): Invoke purge_builtin_constant_p
pass after GCSE and before loop.
(flag_gcse): No longer static.
* flags.h (flag_gcse): Prototype here.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@61642 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/cse.c b/gcc/cse.c index 1a4ca2e7765..8f9ac33cc25 100644 --- a/gcc/cse.c +++ b/gcc/cse.c @@ -1,6 +1,6 @@ /* Common subexpression elimination for GNU compiler. Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998 - 1999, 2000, 2001, 2002 Free Software Foundation, Inc. + 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. This file is part of GCC. @@ -4332,9 +4332,14 @@ fold_rtx (x, insn) break; case 'x': - /* Always eliminate CONSTANT_P_RTX at this stage. */ + /* Eliminate CONSTANT_P_RTX if its constant. */ if (code == CONSTANT_P_RTX) - return (const_arg0 ? const1_rtx : const0_rtx); + { + if (const_arg0) + return const1_rtx; + if (!flag_gcse) + return const0_rtx; + } break; } |