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-rw-r--r--test/fixedbugs/bug440_64.go21
1 files changed, 21 insertions, 0 deletions
diff --git a/test/fixedbugs/bug440_64.go b/test/fixedbugs/bug440_64.go
new file mode 100644
index 0000000..3ab3e56
--- /dev/null
+++ b/test/fixedbugs/bug440_64.go
@@ -0,0 +1,21 @@
+// run
+
+// Test for 6g register move bug. The optimizer gets confused
+// about 32- vs 64-bit moves during splitContractIndex.
+
+// Issue 3918.
+
+package main
+
+func main() {
+ const c = 0x123400005678
+ index, offset := splitContractIndex(c)
+ if index != (c&0xffffffff)>>5 || offset != c+1 {
+ println("BUG", index, offset)
+ }
+}
+
+func splitContractIndex(ce uint64) (index uint32, offset uint64) {
+ h := uint32(ce)
+ return h >> 5, ce + 1
+}