Convert Outer Control Structure to Loop

lib/compress/zstd_double_fast.c

@@ -104,8 +104,8 @@ size_t ZSTD_compressBlock_doubleFast_noDict_generic(
         if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0;
     }
 
-_start:
-
+    /* Outer Loop: one iteration per match found and stored */
+    while (1) {
         step = 1;
         nextStep = ip + kStepIncr;
         ip1 = ip + step;
@@ -118,7 +118,7 @@ _start:
         idxl0 = hashLong[hl0];
         matchl0 = base + idxl0;
 
-    /* Main Search Loop */
+        /* Inner Loop: one iteration per search / position */
         do {
             const size_t hs0 = ZSTD_hashPtr(ip, hBitsS, mls);
             const U32 idxs0 = hashSmall[hs0];
@@ -169,9 +169,9 @@ _start:
             hl0 = hl1;
             idxl0 = idxl1;
             matchl0 = matchl1;
-#if defined(__aarch64__)
+    #if defined(__aarch64__)
             PREFETCH_L1(ip+256);
-#endif
+    #endif
         } while (ip1 <= ilimit);
 
 _cleanup:
@@ -247,9 +247,9 @@ _match_stored:
                 ip += rLength;
                 anchor = ip;
                 continue;   /* faster when present ... (?) */
-    }   }
-
-    goto _start;
+            }
+        }
+    }
 }