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[Bug other/55981] std::atomic store is split in two smaller stores
- From: "eugeni.stepanov at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 14 Jan 2013 22:45:30 +0000
- Subject: [Bug other/55981] std::atomic store is split in two smaller stores
- Auto-submitted: auto-generated
- References: <bug-55981-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55981
--- Comment #1 from Evgeniy Stepanov <eugeni.stepanov at gmail dot com> 2013-01-14 22:45:30 UTC ---
Disassembly of the loop in ff() function:
4007c0: movl $0x2,0x2008de(%rip) # 6010a8 <y>
4007ca: movl $0x1,0x2008d8(%rip) # 6010ac <y+0x4>
4007d4: sub $0x1,%eax
4007d7: mfence
4007da: movl $0x4,0x2008c4(%rip) # 6010a8 <y>
4007e4: movl $0x3,0x2008be(%rip) # 6010ac <y+0x4>
4007ee: mfence
4007f1: jne 4007c0 <_Z2ffv+0xb0>
Does not look atomic.
Has all the proper fences, though.