pp_iter: replace if/else with switch

Makes the code neater and slightly faster

diff --git a/pp_hot.c b/pp_hot.c
index aefe455..f4f4622 100644 (file)
--- a/pp_hot.c
+++ b/pp_hot.c
@@ -1904,11 +1904,11 @@ PP(pp_iter)
 
     EXTEND(SP, 1);
     cx = &cxstack[cxstack_ix];
-    if (!CxTYPE_is_LOOP(cx))
-       DIE(aTHX_ "panic: pp_iter, type=%u", CxTYPE(cx));
-
     itersvp = CxITERVAR(cx);
-    if (CxTYPE(cx) == CXt_LOOP_LAZYSV) {
+
+    switch (CxTYPE(cx)) {
+    case CXt_LOOP_LAZYSV:
+        {
            /* string increment */
            SV* cur = cx->blk_loop.state_u.lazysv.cur;
            SV *end = cx->blk_loop.state_u.lazysv.end;
@@ -1937,8 +1937,10 @@ PP(pp_iter)
                RETPUSHYES;
            }
            RETPUSHNO;
-    }
-    else if (CxTYPE(cx) == CXt_LOOP_LAZYIV) {
+            break;
+        }
+
+    case CXt_LOOP_LAZYIV:
        /* integer increment */
        if (cx->blk_loop.state_u.lazyiv.cur > cx->blk_loop.state_u.lazyiv.end)
            RETPUSHNO;
@@ -1963,12 +1965,12 @@ PP(pp_iter)
            cx->blk_loop.state_u.lazyiv.end = IV_MIN;
        } else
            ++cx->blk_loop.state_u.lazyiv.cur;
-
        RETPUSHYES;
-    }
+        break;
+
+    case CXt_LOOP_FOR:
 
     /* iterate array */
-    assert(CxTYPE(cx) == CXt_LOOP_FOR);
     av = cx->blk_loop.state_u.ary.ary;
     if (!av) {
        av_is_stack = TRUE;
@@ -2027,6 +2029,11 @@ PP(pp_iter)
     SvREFCNT_dec(oldsv);
 
     RETPUSHYES;
+    break;
+
+    default:
+       DIE(aTHX_ "panic: pp_iter, type=%u", CxTYPE(cx));
+    }
 }
 
 /*