OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

(final_scan_insn): Use single_set to check cc_status.flags. 

From-SVN: r14177
This commit is contained in:
Richard Kenner 1997-06-09 09:19:15 -04:00
parent f9dcab5273
commit b88c92ccb2
1 changed files with 14 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
gcc/final.c
View File

@ -1651,7 +1651,7 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
default:
{
register rtx body = PATTERN (insn);
register rtx body = PATTERN (insn), set;
int insn_code_number;
char *template;
rtx note;
@ -1853,6 +1853,8 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
body = PATTERN (insn);
#ifdef HAVE_cc0
set = single_set(insn);
/* Check for redundant test and compare instructions
(when the condition codes are already set up as desired).
This is done only when optimizing; if not optimizing,
@ -1863,7 +1865,9 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
if (optimize)
{
#if 0
rtx set = single_set(insn);
#endif
if (set
&& GET_CODE (SET_DEST (set)) == CC0
@ -1978,20 +1982,20 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
handle conditional moves (if this machine has either one). */
if (cc_status.flags != 0
&& GET_CODE (body) == SET)
&& set != 0)
{
rtx cond_rtx, then_rtx, else_rtx;
if (GET_CODE (insn) != JUMP_INSN
&& GET_CODE (SET_SRC (body)) == IF_THEN_ELSE)
&& GET_CODE (SET_SRC (set)) == IF_THEN_ELSE)
{
cond_rtx = XEXP (SET_SRC (body), 0);
then_rtx = XEXP (SET_SRC (body), 1);
else_rtx = XEXP (SET_SRC (body), 2);
cond_rtx = XEXP (SET_SRC (set), 0);
then_rtx = XEXP (SET_SRC (set), 1);
else_rtx = XEXP (SET_SRC (set), 2);
}
else
{
cond_rtx = SET_SRC (body);
cond_rtx = SET_SRC (set);
then_rtx = const_true_rtx;
else_rtx = const0_rtx;
}
@ -2014,12 +2018,12 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
break;
result = alter_cond (cond_rtx);
if (result == 1)
validate_change (insn, &SET_SRC (body), then_rtx, 0);
validate_change (insn, &SET_SRC (set), then_rtx, 0);
else if (result == -1)
validate_change (insn, &SET_SRC (body), else_rtx, 0);
validate_change (insn, &SET_SRC (set), else_rtx, 0);
else if (result == 2)
INSN_CODE (insn) = -1;
if (SET_DEST (body) == SET_SRC (body))
if (SET_DEST (set) == SET_SRC (set))
{
PUT_CODE (insn, NOTE);
NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;