aboutsummaryrefslogtreecommitdiff
path: root/sim/aarch64
diff options
context:
space:
mode:
authorJim Wilson <jim.wilson@linaro.org>2017-02-25 20:04:09 -0800
committerJim Wilson <jim.wilson@linaro.org>2017-02-25 20:04:09 -0800
commitac189e7bf8865d61b4f5e89a530476f9e4c5c70b (patch)
tree6259f1c8e9c66da0df22cb004046855101fa5111 /sim/aarch64
parenta8a0c9384831bc03b43e60b8d7896a403807335a (diff)
downloadgdb-ac189e7bf8865d61b4f5e89a530476f9e4c5c70b.zip
gdb-ac189e7bf8865d61b4f5e89a530476f9e4c5c70b.tar.gz
gdb-ac189e7bf8865d61b4f5e89a530476f9e4c5c70b.tar.bz2
Add missing cnt (popcount) instruction support.
sim/aarch64/ * simulator.c (popcount): New. (do_vec_CNT): New. (do_vec_op1): Add do_vec_CNT call. sim/testsuite/sim/aarch64/ * cnt.s: New.
Diffstat (limited to 'sim/aarch64')
-rw-r--r--sim/aarch64/ChangeLog6
-rw-r--r--sim/aarch64/simulator.c51
2 files changed, 57 insertions, 0 deletions
diff --git a/sim/aarch64/ChangeLog b/sim/aarch64/ChangeLog
index dbe68ec..243ec0e 100644
--- a/sim/aarch64/ChangeLog
+++ b/sim/aarch64/ChangeLog
@@ -1,3 +1,9 @@
+2017-02-25 Jim Wilson <jim.wilson@linaro.org>
+
+ * simulator.c (popcount): New.
+ (do_vec_CNT): New.
+ (do_vec_op1): Add do_vec_CNT call.
+
2017-02-19 Jim Wilson <jim.wilson@linaro.org>
* simulator.c (do_vec_ADDV): Mov val declaration inside each case,
diff --git a/sim/aarch64/simulator.c b/sim/aarch64/simulator.c
index d31cb10..f430159 100644
--- a/sim/aarch64/simulator.c
+++ b/sim/aarch64/simulator.c
@@ -4197,6 +4197,56 @@ do_vec_XTN (sim_cpu *cpu)
}
}
+/* Return the number of bits set in the input value. */
+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+# define popcount __builtin_popcount
+#else
+static int
+popcount (unsigned char x)
+{
+ static const unsigned char popcnt[16] =
+ {
+ 0, 1, 1, 2,
+ 1, 2, 2, 3,
+ 1, 2, 2, 3,
+ 2, 3, 3, 4
+ };
+
+ /* Only counts the low 8 bits of the input as that is all we need. */
+ return popcnt[x % 16] + popcnt[x / 16];
+}
+#endif
+
+static void
+do_vec_CNT (sim_cpu *cpu)
+{
+ /* instr[31] = 0
+ instr[30] = half (0)/ full (1)
+ instr[29,24] = 00 1110
+ instr[23,22] = size: byte(00)
+ instr[21,10] = 1000 0001 0110
+ instr[9,5] = Vs
+ instr[4,0] = Vd. */
+
+ unsigned vs = INSTR (9, 5);
+ unsigned vd = INSTR (4, 0);
+ int full = INSTR (30, 30);
+ int size = INSTR (23, 22);
+ int i;
+
+ NYI_assert (29, 24, 0x0E);
+ NYI_assert (21, 10, 0x816);
+
+ if (size != 0)
+ HALT_UNALLOC;
+
+ TRACE_DECODE (cpu, "emulated at line %d", __LINE__);
+
+ for (i = 0; i < (full ? 16 : 8); i++)
+ aarch64_set_vec_u8 (cpu, vd, i,
+ popcount (aarch64_get_vec_u8 (cpu, vs, i)));
+}
+
static void
do_vec_maxv (sim_cpu *cpu)
{
@@ -5605,6 +5655,7 @@ do_vec_op1 (sim_cpu *cpu)
case 0x08: do_vec_sub_long (cpu); return;
case 0x0a: do_vec_XTN (cpu); return;
case 0x11: do_vec_SSHL (cpu); return;
+ case 0x16: do_vec_CNT (cpu); return;
case 0x19: do_vec_max (cpu); return;
case 0x1B: do_vec_min (cpu); return;
case 0x21: do_vec_add (cpu); return;