From 0a92994c4b880f2ac449e9da063e6ec435e31df9 Mon Sep 17 00:00:00 2001
From: Alexey Andreev <konsoletyper@gmail.com>
Date: Thu, 14 Sep 2023 10:04:27 +0200
Subject: [PATCH] classlib: improve accuracy of double parser and fix possible
 issue

---
 .../java/org/teavm/classlib/impl/text/DoubleAnalyzer.java     | 4 ----
 .../java/org/teavm/classlib/impl/text/DoubleSynthesizer.java  | 4 ++++
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/classlib/src/main/java/org/teavm/classlib/impl/text/DoubleAnalyzer.java b/classlib/src/main/java/org/teavm/classlib/impl/text/DoubleAnalyzer.java
index 6b583dd1f..075a2226f 100644
--- a/classlib/src/main/java/org/teavm/classlib/impl/text/DoubleAnalyzer.java
+++ b/classlib/src/main/java/org/teavm/classlib/impl/text/DoubleAnalyzer.java
@@ -134,10 +134,6 @@ public final class DoubleAnalyzer {
 
         long c = (c3 << (32 + shift)) + (c2 << (16 + shift)) + (c1 << shift);
         cm += c0 << 16;
-        // TODO: removing this gives better result in random tests, however toString(1.0) gives '0.5'
-        if (((cm >>> (31 - shift)) & 1) != 0) {
-            ++c;
-        }
         c += cm >>> (32 - shift);
 
         return c;
diff --git a/classlib/src/main/java/org/teavm/classlib/impl/text/DoubleSynthesizer.java b/classlib/src/main/java/org/teavm/classlib/impl/text/DoubleSynthesizer.java
index 6b8c7461c..d20cd61c9 100644
--- a/classlib/src/main/java/org/teavm/classlib/impl/text/DoubleSynthesizer.java
+++ b/classlib/src/main/java/org/teavm/classlib/impl/text/DoubleSynthesizer.java
@@ -39,6 +39,10 @@ public final class DoubleSynthesizer {
             return negative ? Double.NEGATIVE_INFINITY : Double.POSITIVE_INFINITY;
         }
         binMantissa += 1L << 4;
+        if ((binMantissa & (-1L << 58L)) != 0) {
+            binMantissa >>>= 1;
+            binExp++;
+        }
         if (binExp <= 0) {
             binMantissa >>= Math.min(-binExp + 1, 64);
             binExp = 0;