[Lldb-commits] [lldb] [lldb] Fix test_case_insensitivity's register value for canonical/PAC constraints (PR #213605)

[Med Ismail Bennani via lldb-commits]

https://github.com/medismailben created https://github.com/llvm/llvm-project/pull/213605

This addresses a test failure introduced in 4f6cf2c2072ccf5780ac30bf69ebf99b788dbd52.

`0x1122334455667788` is a non-canonical address on x86_64 (fails to write to rsp) and gets its non-addressing bits masked off on read for pc/lr/sp/fp on Darwin AArch64, so it doesn't round-trip on either. Zero the top 20 bits to stay clear of both.

>From 56fb7ff73e7f4af9c660e128c7ae8e3366310bbc Mon Sep 17 00:00:00 2001
From: Med Ismail Bennani <ismail at bennani.ma>
Date: Sun, 2 Aug 2026 23:50:23 -0700
Subject: [PATCH] [lldb] Fix test_case_insensitivity's register value for
 canonical/PAC constraints

0x1122334455667788 is a non-canonical address on x86_64 (fails to write to
rsp) and gets its non-addressing bits masked off on read for pc/lr/sp/fp on
Darwin AArch64, so it doesn't round-trip on either. Zero the top 20 bits to
stay clear of both.
---
 .../API/commands/register/register_command/TestRegisters.py  | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lldb/test/API/commands/register/register_command/TestRegisters.py b/lldb/test/API/commands/register/register_command/TestRegisters.py
index 5a2ac7b0ebbf3..1b1810cb37c58 100644
--- a/lldb/test/API/commands/register/register_command/TestRegisters.py
+++ b/lldb/test/API/commands/register/register_command/TestRegisters.py
@@ -727,7 +727,10 @@ def setup():
             self.build()
             self.common_setup()
 
-        expected = "0x1122334455667788"
+        # Top 20 bits zeroed: a non-canonical x86_64 address fails to write to
+        # rsp, and Darwin AArch64 masks non-addressing bits off pc/lr/sp/fp
+        # on read, so anything higher isn't safe to round-trip here.
+        expected = "0x0000034455667788"
 
         if self.getArchitecture() in ["amd64", "x86_64"]:
             setup()