[PATCH v3 07/44] target/arm: Implement MVE VABS

[Peter Maydell <peter.maydell@linaro.org>]

Implement the MVE VABS functions (both integer and floating point).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/helper-mve.h    |  6 ++++++
 target/arm/mve.decode      |  3 +++
 target/arm/mve_helper.c    | 13 +++++++++++++
 target/arm/translate-mve.c | 15 +++++++++++++++
 4 files changed, 37 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index f1dc52f7a50..76508d5dd71 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -49,3 +49,9 @@ DEF_HELPER_FLAGS_3(mve_vrev64h, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vrev64w, TCG_CALL_NO_WG, void, env, ptr, ptr)
 
 DEF_HELPER_FLAGS_3(mve_vmvn, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vabsb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vabsh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vabsw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vfabsh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vfabss, TCG_CALL_NO_WG, void, env, ptr, ptr)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index ff8afb682fb..66963dc1847 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -77,3 +77,6 @@ VREV32           1111 1111 1 . 11 .. 00 ... 0 0000 11 . 0 ... 0 @1op
 VREV64           1111 1111 1 . 11 .. 00 ... 0 0000 01 . 0 ... 0 @1op
 
 VMVN             1111 1111 1 . 11 00 00 ... 0 0101 11 . 0 ... 0 @1op_nosz
+
+VABS             1111 1111 1 . 11 .. 01 ... 0 0011 01 . 0 ... 0 @1op
+VABS_fp          1111 1111 1 . 11 .. 01 ... 0 0111 01 . 0 ... 0 @1op
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 97da43fa3d6..eaf750ead0b 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -24,6 +24,7 @@
 #include "exec/helper-proto.h"
 #include "exec/cpu_ldst.h"
 #include "exec/exec-all.h"
+#include "tcg/tcg.h"
 
 static uint16_t mve_element_mask(CPUARMState *env)
 {
@@ -296,3 +297,15 @@ DO_1OP(vrev64w, 8, uint64_t, wswap64)
 #define DO_NOT(N) (~(N))
 
 DO_1OP(vmvn, 8, uint64_t, DO_NOT)
+
+#define DO_ABS(N) ((N) < 0 ? -(N) : (N))
+#define DO_FABSH(N)  ((N) & dup_const(MO_16, 0x7fff))
+#define DO_FABSS(N)  ((N) & dup_const(MO_32, 0x7fffffff))
+
+DO_1OP(vabsb, 1, int8_t, DO_ABS)
+DO_1OP(vabsh, 2, int16_t, DO_ABS)
+DO_1OP(vabsw, 4, int32_t, DO_ABS)
+
+/* We can do these 64 bits at a time */
+DO_1OP(vfabsh, 8, uint64_t, DO_FABSH)
+DO_1OP(vfabss, 8, uint64_t, DO_FABSS)
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index bd908abcff7..90996813a85 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -199,6 +199,7 @@ static bool do_1op(DisasContext *s, arg_1op *a, MVEGenOneOpFn fn)
 
 DO_1OP(VCLZ, vclz)
 DO_1OP(VCLS, vcls)
+DO_1OP(VABS, vabs)
 
 static bool trans_VREV16(DisasContext *s, arg_1op *a)
 {
@@ -237,3 +238,17 @@ static bool trans_VMVN(DisasContext *s, arg_1op *a)
 {
     return do_1op(s, a, gen_helper_mve_vmvn);
 }
+
+static bool trans_VABS_fp(DisasContext *s, arg_1op *a)
+{
+    static MVEGenOneOpFn * const fns[] = {
+        NULL,
+        gen_helper_mve_vfabsh,
+        gen_helper_mve_vfabss,
+        NULL,
+    };
+    if (!dc_isar_feature(aa32_mve_fp, s)) {
+        return false;
+    }
+    return do_1op(s, a, fns[a->size]);
+}
-- 
2.20.1