S/390 epilogue ends with (parallel [(return) (use %r14)]) instead of
the more usual (return) or (simple_return). This sequence is not
recognized by the conditional return logic in try_optimize_cfg ().
This was introduced for processors older than z196, where it is
sometimes profitable to use call-clobbered register for returning
instead of %r14. On newer processors we always return via %r14,
for which the fact that it's used is already reflected by
EPILOGUE_USES. In this case a simple (return) suffices.
This patch changes return_use () to emit simple (return)s when
returning via %r14. The resulting sequences are recognized by the
conditional return logic in try_optimize_cfg ().
gcc/ChangeLog:
2018-09-19 Ilya Leoshkevich <i...@linux.ibm.com>
PR target/80080
* config/s390/s390.md: Do not use PARALLEL RETURN+USE when
returning via %r14.
gcc/testsuite/ChangeLog:
2018-09-19 Ilya Leoshkevich <i...@linux.ibm.com>
PR target/80080
* gcc.target/s390/risbg-ll-3.c: Expect conditional returns.
* gcc.target/s390/zvector/vec-cmp-2.c: Likewise.
---
gcc/config/s390/s390.md | 7 +++
gcc/testsuite/gcc.target/s390/risbg-ll-3.c | 6 +--
.../gcc.target/s390/zvector/vec-cmp-2.c | 48 +++++++++----------
3 files changed, 34 insertions(+), 27 deletions(-)
diff --git a/gcc/config/s390/s390.md b/gcc/config/s390/s390.md
index 35d22eb50cc..eb363e6d7f8 100644
--- a/gcc/config/s390/s390.md
+++ b/gcc/config/s390/s390.md
@@ -10831,6 +10831,13 @@
(use (match_operand 0 "register_operand" "a"))])]
""
{
+ if (REGNO (operands[0]) == RETURN_REGNUM && s390_can_use_return_insn ())
+ {
+ /* The fact that RETURN_REGNUM is used is already reflected by
+ EPILOGUE_USES. Emit plain (return). */
+ emit_jump_insn (gen_return ());
+ DONE;
+ }
if (!TARGET_CPU_Z10
&& TARGET_INDIRECT_BRANCH_NOBP_RET_OPTION)
{
diff --git a/gcc/testsuite/gcc.target/s390/risbg-ll-3.c
b/gcc/testsuite/gcc.target/s390/risbg-ll-3.c
index 838f1ffbd91..2a2db543cd9 100644
--- a/gcc/testsuite/gcc.target/s390/risbg-ll-3.c
+++ b/gcc/testsuite/gcc.target/s390/risbg-ll-3.c
@@ -23,7 +23,7 @@ i64 f1 (i64 v_a, i64 v_b)
extern i64 f2_foo();
i64 f2 (i64 v_a, i64 v_b)
{
-/* { dg-final { scan-assembler "f2:\n\trisbg\t%r2,%r3,60,62,0\n\tje\t" {
target { lp64 } } } } */
+/* { dg-final { scan-assembler
"f2:\n\trisbg\t%r2,%r3,60,62,0\n\tbner\t%r14\n\tjg\tf2_foo\n" { target { lp64 }
} } } */
/* { dg-final { scan-assembler
"f2:\n\trisbgn\t%r3,%r2,0,0\\\+32-1,64-0-32\n\trisbg\t%r3,%r5,60,62,0" { target
{ ! lp64 } } } } */
i64 v_anda = v_a & -15;
i64 v_andb = v_b & 14;
@@ -37,8 +37,8 @@ i64 f2 (i64 v_a, i64 v_b)
void f2_bar ();
void f2_cconly (i64 v_a, i64 v_b)
{
-/* { dg-final { scan-assembler "f2_cconly:\n\trisbg\t%r3,%r2,63,59,0\n\tjne\t"
{ target { lp64 } } } } */
-/* { dg-final { scan-assembler
"f2_cconly:\n\trisbgn\t%r3,%r2,0,0\\\+32-1,64-0-32\n\trisbg\t%r3,%r5,60,62,0\n\tjne\t"
{ target { ! lp64 } } } } */
+/* { dg-final { scan-assembler
"f2_cconly:\n\trisbg\t%r3,%r2,63,59,0\n\tber\t%r14\n\tjg\tf2_bar\n" { target {
lp64 } } } } */
+/* { dg-final { scan-assembler
"f2_cconly:\n\trisbgn\t%r3,%r2,0,0\\\+32-1,64-0-32\n\trisbg\t%r3,%r5,60,62,0\n\tber\t%r14\n\tjg\tf2_bar\n"
{ target { ! lp64 } } } } */
if ((v_a & -15) | (v_b & 14))
f2_bar();
}
diff --git a/gcc/testsuite/gcc.target/s390/zvector/vec-cmp-2.c
b/gcc/testsuite/gcc.target/s390/zvector/vec-cmp-2.c
index 1e63defa063..09a15eb25f0 100644
--- a/gcc/testsuite/gcc.target/s390/zvector/vec-cmp-2.c
+++ b/gcc/testsuite/gcc.target/s390/zvector/vec-cmp-2.c
@@ -15,7 +15,7 @@ all_eq_double (vector double a, vector double b)
if (__builtin_expect (vec_all_eq (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_eq_double:\n\tvfcedbs\t%v\[0-9\]*,%v24,%v26\n\tjne 1 } } */
+/* { dg-final { scan-assembler-times
all_eq_double:\n\tvfcedbs\t%v\[0-9\]*,%v24,%v26\n\tbner\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_ne_double (vector double a, vector double b)
@@ -23,7 +23,7 @@ all_ne_double (vector double a, vector double b)
if (__builtin_expect (vec_all_ne (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_ne_double:\n\tvfcedbs\t%v\[0-9\]*,%v24,%v26\n\tjle 1 } } */
+/* { dg-final { scan-assembler-times
all_ne_double:\n\tvfcedbs\t%v\[0-9\]*,%v24,%v26\n\tbler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_gt_double (vector double a, vector double b)
@@ -31,7 +31,7 @@ all_gt_double (vector double a, vector double b)
if (__builtin_expect (vec_all_gt (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_gt_double:\n\tvfchdbs\t%v\[0-9\]*,%v24,%v26\n\tjne 1 } } */
+/* { dg-final { scan-assembler-times
all_gt_double:\n\tvfchdbs\t%v\[0-9\]*,%v24,%v26\n\tbner\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_lt_double (vector double a, vector double b)
@@ -39,7 +39,7 @@ all_lt_double (vector double a, vector double b)
if (__builtin_expect (vec_all_lt (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_lt_double:\n\tvfchdbs\t%v\[0-9\]*,%v26,%v24\n\tjne 1 } } */
+/* { dg-final { scan-assembler-times
all_lt_double:\n\tvfchdbs\t%v\[0-9\]*,%v26,%v24\n\tbner\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_ge_double (vector double a, vector double b)
@@ -47,7 +47,7 @@ all_ge_double (vector double a, vector double b)
if (__builtin_expect (vec_all_ge (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_ge_double:\n\tvfchedbs\t%v\[0-9\]*,%v24,%v26\n\tjne 1 } } */
+/* { dg-final { scan-assembler-times
all_ge_double:\n\tvfchedbs\t%v\[0-9\]*,%v24,%v26\n\tbner\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_le_double (vector double a, vector double b)
@@ -55,7 +55,7 @@ all_le_double (vector double a, vector double b)
if (__builtin_expect (vec_all_le (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_le_double:\n\tvfchedbs\t%v\[0-9\]*,%v26,%v24\n\tjne 1 } } */
+/* { dg-final { scan-assembler-times
all_le_double:\n\tvfchedbs\t%v\[0-9\]*,%v26,%v24\n\tbner\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_eq_double (vector double a, vector double b)
@@ -63,7 +63,7 @@ any_eq_double (vector double a, vector double b)
if (__builtin_expect (vec_any_eq (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_eq_double:\n\tvfcedbs\t%v\[0-9\]*,%v24,%v26\n\tjnle 1 } } */
+/* { dg-final { scan-assembler-times
any_eq_double:\n\tvfcedbs\t%v\[0-9\]*,%v24,%v26\n\tbnler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_ne_double (vector double a, vector double b)
@@ -71,7 +71,7 @@ any_ne_double (vector double a, vector double b)
if (__builtin_expect (vec_any_ne (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_ne_double:\n\tvfcedbs\t%v\[0-9\]*,%v24,%v26\n\tje 1 } } */
+/* { dg-final { scan-assembler-times
any_ne_double:\n\tvfcedbs\t%v\[0-9\]*,%v24,%v26\n\tber\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_gt_double (vector double a, vector double b)
@@ -79,7 +79,7 @@ any_gt_double (vector double a, vector double b)
if (__builtin_expect (vec_any_gt (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_gt_double:\n\tvfchdbs\t%v\[0-9\]*,%v24,%v26\n\tjnle 1 } } */
+/* { dg-final { scan-assembler-times
any_gt_double:\n\tvfchdbs\t%v\[0-9\]*,%v24,%v26\n\tbnler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_lt_double (vector double a, vector double b)
@@ -87,7 +87,7 @@ any_lt_double (vector double a, vector double b)
if (__builtin_expect (vec_any_lt (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_lt_double:\n\tvfchdbs\t%v\[0-9\]*,%v26,%v24\n\tjnle 1 } } */
+/* { dg-final { scan-assembler-times
any_lt_double:\n\tvfchdbs\t%v\[0-9\]*,%v26,%v24\n\tbnler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_ge_double (vector double a, vector double b)
@@ -95,7 +95,7 @@ any_ge_double (vector double a, vector double b)
if (__builtin_expect (vec_any_ge (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_ge_double:\n\tvfchedbs\t%v\[0-9\]*,%v24,%v26\n\tjnle 1 } } */
+/* { dg-final { scan-assembler-times
any_ge_double:\n\tvfchedbs\t%v\[0-9\]*,%v24,%v26\n\tbnler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_le_double (vector double a, vector double b)
@@ -103,7 +103,7 @@ any_le_double (vector double a, vector double b)
if (__builtin_expect (vec_any_le (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_le_double:\n\tvfchedbs\t%v\[0-9\]*,%v26,%v24\n\tjnle 1 } } */
+/* { dg-final { scan-assembler-times
any_le_double:\n\tvfchedbs\t%v\[0-9\]*,%v26,%v24\n\tbnler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_eq_int (vector int a, vector int b)
@@ -111,7 +111,7 @@ all_eq_int (vector int a, vector int b)
if (__builtin_expect (vec_all_eq (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_eq_int:\n\tvceqfs\t%v\[0-9\]*,%v24,%v26\n\tjne 1 } } */
+/* { dg-final { scan-assembler-times
all_eq_int:\n\tvceqfs\t%v\[0-9\]*,%v24,%v26\n\tbner\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_ne_int (vector int a, vector int b)
@@ -119,7 +119,7 @@ all_ne_int (vector int a, vector int b)
if (__builtin_expect (vec_all_ne (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_ne_int:\n\tvceqfs\t%v\[0-9\]*,%v24,%v26\n\tjle 1 } } */
+/* { dg-final { scan-assembler-times
all_ne_int:\n\tvceqfs\t%v\[0-9\]*,%v24,%v26\n\tbler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_gt_int (vector int a, vector int b)
@@ -127,7 +127,7 @@ all_gt_int (vector int a, vector int b)
if (__builtin_expect (vec_all_gt (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_gt_int:\n\tvchfs\t%v\[0-9\]*,%v24,%v26\n\tjne 1 } } */
+/* { dg-final { scan-assembler-times
all_gt_int:\n\tvchfs\t%v\[0-9\]*,%v24,%v26\n\tbner\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_lt_int (vector int a, vector int b)
@@ -135,7 +135,7 @@ all_lt_int (vector int a, vector int b)
if (__builtin_expect (vec_all_lt (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_lt_int:\n\tvchfs\t%v\[0-9\]*,%v26,%v24\n\tjne 1 } } */
+/* { dg-final { scan-assembler-times
all_lt_int:\n\tvchfs\t%v\[0-9\]*,%v26,%v24\n\tbner\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_ge_int (vector int a, vector int b)
@@ -143,7 +143,7 @@ all_ge_int (vector int a, vector int b)
if (__builtin_expect (vec_all_ge (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_ge_int:\n\tvchfs\t%v\[0-9\]*,%v26,%v24\n\tjle 1 } } */
+/* { dg-final { scan-assembler-times
all_ge_int:\n\tvchfs\t%v\[0-9\]*,%v26,%v24\n\tbler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
all_le_int (vector int a, vector int b)
@@ -151,7 +151,7 @@ all_le_int (vector int a, vector int b)
if (__builtin_expect (vec_all_le (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
all_le_int:\n\tvchfs\t%v\[0-9\]*,%v24,%v26\n\tjle 1 } } */
+/* { dg-final { scan-assembler-times
all_le_int:\n\tvchfs\t%v\[0-9\]*,%v24,%v26\n\tbler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_eq_int (vector int a, vector int b)
@@ -159,7 +159,7 @@ any_eq_int (vector int a, vector int b)
if (__builtin_expect (vec_any_eq (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_eq_int:\n\tvceqfs\t%v\[0-9\]*,%v24,%v26\n\tjnle 1 } } */
+/* { dg-final { scan-assembler-times
any_eq_int:\n\tvceqfs\t%v\[0-9\]*,%v24,%v26\n\tbnler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_ne_int (vector int a, vector int b)
@@ -167,7 +167,7 @@ any_ne_int (vector int a, vector int b)
if (__builtin_expect (vec_any_ne (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_ne_int:\n\tvceqfs\t%v\[0-9\]*,%v24,%v26\n\tje 1 } } */
+/* { dg-final { scan-assembler-times
any_ne_int:\n\tvceqfs\t%v\[0-9\]*,%v24,%v26\n\tber\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_gt_int (vector int a, vector int b)
@@ -175,7 +175,7 @@ any_gt_int (vector int a, vector int b)
if (__builtin_expect (vec_any_gt (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_gt_int:\n\tvchfs\t%v\[0-9\]*,%v24,%v26\n\tjnle 1 } } */
+/* { dg-final { scan-assembler-times
any_gt_int:\n\tvchfs\t%v\[0-9\]*,%v24,%v26\n\tbnler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_lt_int (vector int a, vector int b)
@@ -183,7 +183,7 @@ any_lt_int (vector int a, vector int b)
if (__builtin_expect (vec_any_lt (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_lt_int:\n\tvchfs\t%v\[0-9\]*,%v26,%v24\n\tjnle 1 } } */
+/* { dg-final { scan-assembler-times
any_lt_int:\n\tvchfs\t%v\[0-9\]*,%v26,%v24\n\tbnler\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_ge_int (vector int a, vector int b)
@@ -191,7 +191,7 @@ any_ge_int (vector int a, vector int b)
if (__builtin_expect (vec_any_ge (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_ge_int:\n\tvchfs\t%v\[0-9\]*,%v26,%v24\n\tje 1 } } */
+/* { dg-final { scan-assembler-times
any_ge_int:\n\tvchfs\t%v\[0-9\]*,%v26,%v24\n\tber\t%r14\n 1 } } */
void __attribute__((noinline,noclone))
any_le_int (vector int a, vector int b)
@@ -199,5 +199,5 @@ any_le_int (vector int a, vector int b)
if (__builtin_expect (vec_any_le (a, b), 1))
g = 2;
}
-/* { dg-final { scan-assembler-times
any_le_int:\n\tvchfs\t%v\[0-9\]*,%v24,%v26\n\tje 1 } } */
+/* { dg-final { scan-assembler-times
any_le_int:\n\tvchfs\t%v\[0-9\]*,%v24,%v26\n\tber\t%r14\n 1 } } */
--
2.19.0
