http://llvm.org/bugs/show_bug.cgi?id=18890
Bug ID: 18890
Summary: Lowering of atomic ops doesn't reuse registers
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12084
--> http://llvm.org/bugs/attachment.cgi?id=12084&action=edit
Test case
Compile the attached test program with -O2 for amd64. Observe that the assembly
is not using known zero value of %rax for the xchg, but creating a new register
for that purpose.
Problem applies to other __sync_* builtins as well.
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