http://llvm.org/bugs/show_bug.cgi?id=8842
Summary: Support for __sync_fetch_and_nand and
__sync_nand_and_fetch
Product: clang
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=5919)
--> (http://llvm.org/bugs/attachment.cgi?id=5919)
GCC 4.4 style __sync_fetch_and_nand and __sync_nand_and_fetch support.
Support for the atomic builtins __sync_fetch_and_nand and __sync_nand_and_fetch
was removed in commit 99522 due to inconsistencies in the GCC implementation.
Specifically, GCC versions prior to 4.4 implemented the atomic as:
{ tmp = *ptr; *ptr = ~tmp & value; return tmp; }
where as, GCC 4.4 and following implements the atomic as:
{ tmp = *ptr; *ptr = ~(tmp & value); return tmp; }
The attached patch supports __sync_fetch_and_nand through the LLVM intrinsic
function llvm.atomic.load.nand and generates GCC 4.4 style code for the atomic
__sync_nand_and_fetch.
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