https://llvm.org/bugs/show_bug.cgi?id=26518
Bug ID: 26518
Summary: rsp register considered uninitialized
Product: clang
Version: 3.8
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: car...@cardoe.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Using: Ubuntu clang version 3.8.0-svn257166-1~exp1 (trunk) (based on LLVM
3.8.0)
The following code:
static inline struct cpu_info *get_cpu_info(void)
{
register unsigned long sp asm("rsp");
return (struct cpu_info *)((sp & ~(STACK_SIZE-1)) + STACK_SIZE) - 1;
}
Results in an uninitialized warning for the variable 'sp' when compiling with
clang. GCC conversely does not report the variable as uninitialized but the
syntax does look like a GCCism. However I think it can be safe to assume that
rsp is initialized so this is probably a small corner case.
Build seen at: https://travis-ci.org/cardoe/xen/jobs/107263394
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