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riscv-gcc-1
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lvzhengyang
riscv-gcc-1
Commits
b88c92cc
Commit
b88c92cc
authored
Jun 09, 1997
by
Richard Kenner
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(final_scan_insn): Use single_set to check cc_status.flags.
From-SVN: r14177
parent
f9dcab52
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14 additions
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10 deletions
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-10
gcc/final.c
+14
-10
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gcc/final.c
View file @
b88c92cc
...
...
@@ -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
;
...
...
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