From b56b6a9538f50ac4d4424bc7ad37d2f462245182 Mon Sep 17 00:00:00 2001
From: Peter Varga <pvarga@inf.u-szeged.hu>
Date: Thu, 21 Apr 2022 08:49:53 +0200
Subject: Workaround MSVC2022 ICE in constexpr functions

It happens around initialization of STL containers in a constexpr
function. In this case, aggregate initialization of std::array with
double braces seems to cause the crash.

For some reason it doesn't seem to happen in 98-based. This workaround
can be reverted after Microsoft fixes the issue:
https://developercommunity.visualstudio.com/t/fatal-error-C1001:-Internal-compiler-err/1669485

Change-Id: I6bc2c71d328691cc74bc53c6d62f3d5df519b81e
Fixes: QTBUG-101917
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
(cherry picked from commit 0ce5e91bdfa2cd7cac247911b9e8c4404c114937)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 chromium/base/hash/md5_constexpr_internal.h | 62 +++++++++++++++++++++++++----
 1 file changed, 55 insertions(+), 7 deletions(-)

diff --git a/chromium/base/hash/md5_constexpr_internal.h b/chromium/base/hash/md5_constexpr_internal.h
index b705bc8ad05..5c9c004455e 100644
--- a/chromium/base/hash/md5_constexpr_internal.h
+++ b/chromium/base/hash/md5_constexpr_internal.h
@@ -281,15 +281,63 @@ struct MD5CE {
     return IntermediateDataToMD5Digest(ProcessMessage(data, n));
   }
 
-  static constexpr uint64_t Hash64(const char* data, uint32_t n) {
-    IntermediateData intermediate = ProcessMessage(data, n);
-    return (static_cast<uint64_t>(SwapEndian(intermediate.a)) << 32) |
-           static_cast<uint64_t>(SwapEndian(intermediate.b));
+  static constexpr uint64_t Hash64(const char* message, uint32_t n) {
+    const uint32_t m = GetPaddedMessageLength(n);
+    IntermediateData intermediate0 = kInitialIntermediateData;
+    for (uint32_t offset = 0; offset < m; offset += 64) {
+      RoundData data = {
+          GetPaddedMessageWord(message, n, m, offset),
+          GetPaddedMessageWord(message, n, m, offset + 4),
+          GetPaddedMessageWord(message, n, m, offset + 8),
+          GetPaddedMessageWord(message, n, m, offset + 12),
+          GetPaddedMessageWord(message, n, m, offset + 16),
+          GetPaddedMessageWord(message, n, m, offset + 20),
+          GetPaddedMessageWord(message, n, m, offset + 24),
+          GetPaddedMessageWord(message, n, m, offset + 28),
+          GetPaddedMessageWord(message, n, m, offset + 32),
+          GetPaddedMessageWord(message, n, m, offset + 36),
+          GetPaddedMessageWord(message, n, m, offset + 40),
+          GetPaddedMessageWord(message, n, m, offset + 44),
+          GetPaddedMessageWord(message, n, m, offset + 48),
+          GetPaddedMessageWord(message, n, m, offset + 52),
+          GetPaddedMessageWord(message, n, m, offset + 56),
+          GetPaddedMessageWord(message, n, m, offset + 60)};
+      IntermediateData intermediate1 = intermediate0;
+      for (uint32_t i = 0; i < 64; ++i)
+        intermediate1 = ApplyStep(i, data, intermediate1);
+      intermediate0 = Add(intermediate0, intermediate1);
+    }
+    return (static_cast<uint64_t>(SwapEndian(intermediate0.a)) << 32) |
+           static_cast<uint64_t>(SwapEndian(intermediate0.b));
   }
 
-  static constexpr uint32_t Hash32(const char* data, uint32_t n) {
-    IntermediateData intermediate = ProcessMessage(data, n);
-    return SwapEndian(intermediate.a);
+  static constexpr uint32_t Hash32(const char* message, uint32_t n) {
+    const uint32_t m = GetPaddedMessageLength(n);
+    IntermediateData intermediate0 = kInitialIntermediateData;
+    for (uint32_t offset = 0; offset < m; offset += 64) {
+      RoundData data = {
+          GetPaddedMessageWord(message, n, m, offset),
+          GetPaddedMessageWord(message, n, m, offset + 4),
+          GetPaddedMessageWord(message, n, m, offset + 8),
+          GetPaddedMessageWord(message, n, m, offset + 12),
+          GetPaddedMessageWord(message, n, m, offset + 16),
+          GetPaddedMessageWord(message, n, m, offset + 20),
+          GetPaddedMessageWord(message, n, m, offset + 24),
+          GetPaddedMessageWord(message, n, m, offset + 28),
+          GetPaddedMessageWord(message, n, m, offset + 32),
+          GetPaddedMessageWord(message, n, m, offset + 36),
+          GetPaddedMessageWord(message, n, m, offset + 40),
+          GetPaddedMessageWord(message, n, m, offset + 44),
+          GetPaddedMessageWord(message, n, m, offset + 48),
+          GetPaddedMessageWord(message, n, m, offset + 52),
+          GetPaddedMessageWord(message, n, m, offset + 56),
+          GetPaddedMessageWord(message, n, m, offset + 60)};
+      IntermediateData intermediate1 = intermediate0;
+      for (uint32_t i = 0; i < 64; ++i)
+        intermediate1 = ApplyStep(i, data, intermediate1);
+      intermediate0 = Add(intermediate0, intermediate1);
+    }
+    return SwapEndian(intermediate0.a);
   }
 };
 
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