http://llvm.org/bugs/show_bug.cgi?id=22101
Bug ID: 22101
Summary: At -O2, debug info says variable has constant value
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13636
--> http://llvm.org/bugs/attachment.cgi?id=13636&action=edit
Sample source
On x86-64 Linux, compiling the attached source with -O2 -g, the debug info
for local variable "compare" has DW_AT_const_value = 0, but actually it can
become 1 or -1.
Trying to reduce the source much further caused the const_value to go away,
leaving "compare" with no location at all, which isn't what I wanted to show.
Might be related to PR22099 but it feels different, mainly because it's
clear "compare" has a fairly extensive lifetime, which is not the case
with the other example.
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