More floating point conversion test cases.

FossilOrigin-Name: 44a736a700ab12b398873400dc06cd334817842b4fa08bf8070a9ad6dbff0b51

manifest

@@ -1,5 +1,5 @@
-C New\sfloating-point\stest\scase.
-D 2026-03-01T23:01:17.452
+C More\sfloating\spoint\sconversion\stest\scases.
+D 2026-03-01T23:23:52.724
 F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@ -1132,7 +1132,7 @@ F test/fork-test.c 9ac2e6423a1d38df3d6be0e8ac15608b545de21e2b19d9d876254c5931b63
 F test/format4.test eeae341953db8b6bda7f549044797c3278a6cc345d11ada81471671b654f8ef4
 F test/fp-speed-1.c b37de94eba034e1703668816225f54510ec60fb0685406608cc707afe6b8234d
 F test/fpconv1.test 63f352682fa65601a326563ad633086df6ab194e6ed5e7366786f38a525a7fd7
-F test/fptest01.sql 73caa1c71ff0d74d5e76d9ad98d9c4a26f3d928f3cd7f737196cf209dffe7cae
+F test/fptest01.sql 210562ad8d5a7895f26273dd3be56561a41bcb51d78a28a337af0f1ceaa3bb8d
 F test/fts-9fd058691.test 78b887e30ae6816df0e1fed6259de4b5a64ad33c
 F test/fts3.test 672a040ea57036fb4b6fdc09027c18d7d24ab654
 F test/fts3_common.tcl dffad248f9ce090800e272017d2898005c28ee6314fc1dd5550643a02666907a
@@ -2197,8 +2197,8 @@ F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee
 F tool/warnings.sh d924598cf2f55a4ecbc2aeb055c10bd5f48114793e7ba25f9585435da29e7e98
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
 F tool/winmain.c 00c8fb88e365c9017db14c73d3c78af62194d9644feaf60e220ab0f411f3604c
-P abecc8e388e294311aa0b572e0a984b8ddad2afbf829c1246e1682fa549c8fac
-R 3a662ca0649735fc41e920572fb64776
+P f353399932e9797198e635405a594c2987850070e3f9aee87a05c5a65d4c1e00
+R 6cbc7c2f243f2aec8662e3be08e46909
 U drh
-Z 42f0fd55beedce180599a4c54b875ae0
+Z bb1e7d38e72f541a9df8b1768869daa5
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-f353399932e9797198e635405a594c2987850070e3f9aee87a05c5a65d4c1e00
+44a736a700ab12b398873400dc06cd334817842b4fa08bf8070a9ad6dbff0b51

test/fptest01.sql

@@ -25,9 +25,52 @@ WITH
   i1(i) AS (VALUES(0) UNION ALL SELECT i+1 FROM i1 WHERE i<15),
   i2(j) AS (VALUES(0) UNION ALL SELECT j+1 FROM i2 WHERE j<0x7fe),
   i3(k) AS (VALUES(0x0000000000000000),
-                  (0x000fffffffffff00),
+                  (0x000ffffffffffff0),
                   (0x0008080808080800)),
   fpint(n) AS (SELECT (j<<52)+i+k FROM i2, i1, i3),
   fp(n,r) AS (SELECT n, ieee754_from_int(n) FROM fpint)
 SELECT n, r FROM fp WHERE r<>(0.0 + (r||''));
 .check ''
+
+# Another batch of 106,444 edge cases:  All postiive floating point
+# values that have only a single bit set in the mantissa part of the
+# number.
+#
+.testcase 110
+WITH
+  i1(i) AS (VALUES(0) UNION ALL SELECT i+1 FROM i1 WHERE i<51),
+  i2(j) AS (VALUES(0) UNION ALL SELECT j+1 FROM i2 WHERE j<0x7fe),
+  fpint(n) AS (SELECT (j<<52)+(1<<i) FROM i2, i1),
+  fp(n,r) AS (SELECT n, ieee754_from_int(n) FROM fpint)
+SELECT n, r FROM fp WHERE r<>(0.0 + (r||''));
+.check ''
+
+# Verify that text -> binary64 conversions agree with system strtod().
+# for 98,256 different edge-cases.
+#
+.testcase 200
+.mode list
+WITH
+  i1(i) AS (VALUES(0) UNION ALL SELECT i+1 FROM i1 WHERE i<15),
+  i2(j) AS (VALUES(0) UNION ALL SELECT j+1 FROM i2 WHERE j<0x7fe),
+  i3(k) AS (VALUES(0x0000000000000000),
+                  (0x000ffffffffffff0),
+                  (0x0008080808080800)),
+  fpint(n) AS (SELECT (j<<52)+i+k FROM i2, i1, i3),
+  fp(r) AS (SELECT ieee754_from_int(n) FROM fpint)
+SELECT r FROM fp WHERE r<>strtod(r||'');
+.check ''
+
+
+# Another batch of 106,444 edge cases:  All postiive floating point
+# values that have only a single bit set in the mantissa part of the
+# number.
+#
+.testcase 210
+WITH
+  i1(i) AS (VALUES(0) UNION ALL SELECT i+1 FROM i1 WHERE i<51),
+  i2(j) AS (VALUES(0) UNION ALL SELECT j+1 FROM i2 WHERE j<0x7fe),
+  fpint(n) AS (SELECT (j<<52)+(1<<i) FROM i2, i1),
+  fp(r) AS (SELECT ieee754_from_int(n) FROM fpint)
+SELECT r FROM fp WHERE r<>strtod(r||'');
+.check ''