target/mips/tx79: Introduce PSUB* opcodes (Parallel Subtract)

Introduce the 'Parallel Subtract' opcodes:

 - PSUBB (Parallel Subtract Byte)
 - PSUBH (Parallel Subtract Halfword)
 - PSUBW (Parallel Subtract Word)

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <820210309145653.743937-11-f4bug@amsat.org>

diff --git a/target/mips/tcg/tx79.decode b/target/mips/tcg/tx79.decode
index 26c80b9bce5e3a2b9ca1aa9e3aa566de66e3a474..d1c07c7d901920a2459f934e6256bb3aa596b316 100644 (file)
--- a/target/mips/tcg/tx79.decode
+++ b/target/mips/tcg/tx79.decode
@@ -29,6 +29,12 @@ MTHI1           011100 .....  0000000000 00000 010001   @rs
 MFLO1           011100 0000000000  ..... 00000 010010   @rd
 MTLO1           011100 .....  0000000000 00000 010011   @rs
 
+# MMI0
+
+PSUBW           011100 ..... ..... ..... 00001 001000   @rs_rt_rd
+PSUBH           011100 ..... ..... ..... 00101 001000   @rs_rt_rd
+PSUBB           011100 ..... ..... ..... 01001 001000   @rs_rt_rd
+
 # MMI2
 
 PCPYLD          011100 ..... ..... ..... 01110 001001   @rs_rt_rd

diff --git a/target/mips/tcg/tx79_translate.c b/target/mips/tcg/tx79_translate.c
index 00364f10d47ce23019a5c2c628bcd59d7f78a7db..3abd1d92e70e2732864a4bb426c4c63f0d66e3a5 100644 (file)
--- a/target/mips/tcg/tx79_translate.c
+++ b/target/mips/tcg/tx79_translate.c
@@ -9,6 +9,7 @@
 
 #include "qemu/osdep.h"
 #include "tcg/tcg-op.h"
+#include "tcg/tcg-op-gvec.h"
 #include "exec/helper-gen.h"
 #include "translate.h"
 
@@ -144,6 +145,24 @@ static bool trans_parallel_arith(DisasContext *ctx, arg_rtype *a,
     return true;
 }
 
+/* Parallel Subtract Byte */
+static bool trans_PSUBB(DisasContext *ctx, arg_rtype *a)
+{
+    return trans_parallel_arith(ctx, a, tcg_gen_vec_sub8_i64);
+}
+
+/* Parallel Subtract Halfword */
+static bool trans_PSUBH(DisasContext *ctx, arg_rtype *a)
+{
+    return trans_parallel_arith(ctx, a, tcg_gen_vec_sub16_i64);
+}
+
+/* Parallel Subtract Word */
+static bool trans_PSUBW(DisasContext *ctx, arg_rtype *a)
+{
+    return trans_parallel_arith(ctx, a, tcg_gen_vec_sub32_i64);
+}
+
 /*
  *     Min/Max (4 instructions)
  *     ------------------------