target/s390x: Implement load-and-zero-rightmost-byte insns

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
qemu · Jun 23, 2017 · c2a5c1d · c2a5c1d
1 parent 45aa9aa
commit c2a5c1d
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diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
@@ -427,6 +427,11 @@
 /* LOAD AND TRAP */
     C(0xe39f, LAT,     RXY_a, LAT, 0, m2_32u, r1, 0, lat, 0)
     C(0xe385, LGAT,    RXY_a, LAT, 0, a2, r1, 0, lgat, 0)
+/* LOAD AND ZERO RIGHTMOST BYTE */
+    C(0xe3eb, LZRF,    RXY_a, LZRB, 0, m2_32u, new, r1_32, lzrb, 0)
+    C(0xe32a, LZRG,    RXY_a, LZRB, 0, m2_64, r1, 0, lzrb, 0)
+/* LOAD LOGICAL AND ZERO RIGHTMOST BYTE */
+    C(0xe33a, LLZRGF,  RXY_a, LZRB, 0, m2_32u, r1, 0, lzrb, 0)
 /* LOAD BYTE */
     C(0xb926, LBR,     RRE,   EI,  0, r2_8s, 0, r1_32, mov2, 0)
     C(0xb906, LGBR,    RRE,   EI,  0, r2_8s, 0, r1, mov2, 0)

diff --git a/target/s390x/translate.c b/target/s390x/translate.c
@@ -2906,6 +2906,12 @@ static ExitStatus op_lurag(DisasContext *s, DisasOps *o)
 }
 #endif
 
+static ExitStatus op_lzrb(DisasContext *s, DisasOps *o)
+{
+    tcg_gen_andi_i64(o->out, o->in2, -256);
+    return NO_EXIT;
+}
+
 static ExitStatus op_mov2(DisasContext *s, DisasOps *o)
 {
     o->out = o->in2;
@@ -5437,6 +5443,7 @@ enum DisasInsnEnum {
 #define FAC_LPP         S390_FEAT_SET_PROGRAM_PARAMETERS /* load-program-parameter */
 #define FAC_DAT_ENH     S390_FEAT_DAT_ENH
 #define FAC_E2          S390_FEAT_EXTENDED_TRANSLATION_2
+#define FAC_LZRB        S390_FEAT_STFLE_53 /* load-and-zero-rightmost-byte */
 
 static const DisasInsn insn_info[] = {
 #include "insn-data.def"