commit 69b2761c2d2b4d3fb4cb91497c2d17865a268970
author Juneyoung Lee <aqjune@gmail.com> Sat Nov 06 15:34:49 2021 +0900
committer Copybara-Service <copybara-worker@google.com> Fri Nov 05 23:41:00 2021 -0700
tree 236fcde5c744e9844efb50f88837473c85b15f8d
parent 3fdbb9f2d86d4cb959a3c7452828b62179ac401a

[Clang/Test]: Rename enable_noundef_analysis to disable-noundef-analysis and turn it off by default

Turning on `enable_noundef_analysis` flag allows better codegen by removing freeze instructions.
I modified clang by renaming `enable_noundef_analysis` flag to `disable-noundef-analysis` and turning it off by default.

Test updates are made as a separate patch: D108453

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D105169

GitOrigin-RevId: 7584ef766a7219b6ee5a400637206d26e0fa98ac

lib/sanitizer_common/sanitizer_linux.cpp

diff --git a/lib/sanitizer_common/sanitizer_linux.cpp b/lib/sanitizer_common/sanitizer_linux.cpp
index ea3e5bd..826c6d3 100644
--- a/lib/sanitizer_common/sanitizer_linux.cpp
+++ b/lib/sanitizer_common/sanitizer_linux.cpp
@@ -1360,7 +1360,7 @@
 #elif defined(__aarch64__)
 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
                     int *parent_tidptr, void *newtls, int *child_tidptr) {
-  long long res;
+  register long long res __asm__("x0");
   if (!fn || !child_stack)
     return -EINVAL;
   CHECK_EQ(0, (uptr)child_stack % 16);