From 861eff79eafc35ac88bbeb1b0edb7269c54ac807 Mon Sep 17 00:00:00 2001
From: miaozhuojun <[email protected]>
Date: Wed, 4 Aug 2021 15:22:25 +0800
Subject: [PATCH 1/8] Update algorithm annotations for fill_words

Summary: <JDK>: update algorithm annotations for fill_words
LLT: NA
Patch Type: huawei
Bug url: NA
---
 .../cpu/aarch64/macroAssembler_aarch64.cpp    | 28 ++++++++++++++-----
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp b/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
index 60dc92953..1401b8627 100644
--- a/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
+++ b/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
@@ -5658,23 +5658,37 @@ void MacroAssembler::fill_words(Register base, Register cnt, Register value)
 {
 //  Algorithm:
 //
-//    scratch1 = cnt & 7;
+//    if (cnt == 0) {
+//      return;
+//    }
+//    if ((p & 8) != 0) {
+//      *p++ = v;
+//    }
+//
+//    scratch1 = cnt & 14;
 //    cnt -= scratch1;
 //    p += scratch1;
-//    switch (scratch1) {
+//    switch (scratch1 / 2) {
 //      do {
-//        cnt -= 8;
-//          p[-8] = v;
+//        cnt -= 16;
+//          p[-16] = v;
+//          p[-15] = v;
 //        case 7:
-//          p[-7] = v;
+//          p[-14] = v;
+//          p[-13] = v;
 //        case 6:
-//          p[-6] = v;
+//          p[-12] = v;
+//          p[-11] = v;
 //          // ...
 //        case 1:
+//          p[-2] = v;
 //          p[-1] = v;
 //        case 0:
-//          p += 8;
+//          p += 16;
 //      } while (cnt);
+//    }
+//    if ((cnt & 1) == 1) {
+//      *p++ = v;
 //    }
 
   assert_different_registers(base, cnt, value, rscratch1, rscratch2);
-- 
2.22.0