Added 66 F3 0F BD opcode ([ARM64_DYNAREC] Too)

2 files changed, 39 insertions, 0 deletions

diff --git a/src/dynarec/arm64/dynarec_arm64_66f30f.c b/src/dynarec/arm64/dynarec_arm64_66f30f.c
index 11a18eba..66e349df 100644
--- a/src/dynarec/arm64/dynarec_arm64_66f30f.c
+++ b/src/dynarec/arm64/dynarec_arm64_66f30f.c
@@ -56,6 +56,27 @@ uintptr_t dynarec64_66F30F(dynarec_arm_t* dyn, uintptr_t addr, uintptr_t ip, int
 
     switch(opcode) {
 
+        case 0xBD:
+            INST_NAME("LZCNT Gw, Ew");
+            SETFLAGS(X_CF|X_ZF, SF_SUBSET);
+            SET_DFNONE(x1);
+            nextop = F8;
+            GETEW(x1, 0);
+            GETGW(x2);
+            IFX(X_CF) {
+                TSTxw_REG(ed, ed);
+                CSETw(x3, cEQ);
+                BFIw(xFlags, x3, F_CF, 1);  // CF = is source 0?
+            }
+            LSLw_IMM(ed, ed, 16);
+            CLZw(gd, ed);
+            IFX(X_ZF) {
+                TSTxw_REG(gd, gd);
+                CSETw(x3, cEQ);
+                BFIw(xFlags, x3, F_ZF, 1);  // ZF = is dest 0?
+            }
+            EWBACK;
+            break;
 
         default:
             DEFAULT;
diff --git a/src/emu/x64run66f30f.c b/src/emu/x64run66f30f.c
index dd466ad5..4e455d7c 100644
--- a/src/emu/x64run66f30f.c
+++ b/src/emu/x64run66f30f.c
@@ -56,6 +56,24 @@ uintptr_t Run66F30F(x64emu_t *emu, rex_t rex, uintptr_t addr)
 
     switch(opcode) {
 
+    case 0xBD:  /* LZCNT Ed,Gd */
+        CHECK_FLAGS(emu);
+        nextop = F8;
+        GETEW(0);
+        GETGW;
+        if(rex.w) {
+            tmp64u = ED->q[0];
+            tmp8u = (tmp64u)?__builtin_clzl(tmp64u):64;
+            CONDITIONAL_SET_FLAG(tmp8u==0, F_ZF);
+            CONDITIONAL_SET_FLAG(tmp8u==64, F_CF);
+        } else {
+            tmp32u = EW->word[0];
+            tmp8u = (tmp32u)?__builtin_clz(tmp32u<<16):16;
+            CONDITIONAL_SET_FLAG(tmp8u==0, F_ZF);
+            CONDITIONAL_SET_FLAG(tmp8u==16, F_CF);
+        }
+        GD->q[0] = tmp8u;
+        break;
 
     default:
         return 0;