diff options
| author | amylaar <amylaar@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-01-23 13:01:42 +0000 |
|---|---|---|
| committer | amylaar <amylaar@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-01-23 13:01:42 +0000 |
| commit | a091e4f5c1a3d1c56ebd0ccf56f09342546170b5 (patch) | |
| tree | 42529d1eb0ebe4cb9d1f1aaac576501e8e97de7d /gcc/postreload.c | |
| parent | d83f298ec8ac0fa640f4854d72ce45a9d08dc799 (diff) | |
| download | gcc-a091e4f5c1a3d1c56ebd0ccf56f09342546170b5.tar.gz | |
* doc/tm.texi: Insert some weasel words when LOAD_EXTEND_OP
may or may not return non-NIL.
* postreload.c (reload_cse_simplify_operands): In LOAD_EXTEND_OP code,
check CANNOT_CHANGE_MODE_CLASS
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@76415 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/postreload.c')
| -rw-r--r-- | gcc/postreload.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/postreload.c b/gcc/postreload.c index 5596d9c2782..6f567f07f9e 100644 --- a/gcc/postreload.c +++ b/gcc/postreload.c @@ -423,6 +423,15 @@ reload_cse_simplify_operands (rtx insn, rtx testreg) || GET_CODE (SET_SRC (set)) == ZERO_EXTEND || GET_CODE (SET_SRC (set)) == SIGN_EXTEND) ; /* Continue ordinary processing. */ +#ifdef CANNOT_CHANGE_MODE_CLASS + /* If the register cannot change mode to word_mode, it follows that + it cannot have been used in word_mode. */ + else if (GET_CODE (SET_DEST (set)) == REG + && CANNOT_CHANGE_MODE_CLASS (GET_MODE (SET_DEST (set)), + word_mode, + REGNO_REG_CLASS (REGNO (SET_DEST (set))))) + ; /* Continue ordinary processing. */ +#endif /* If this is a straight load, make the extension explicit. */ else if (GET_CODE (SET_DEST (set)) == REG && recog_data.n_operands == 2 |