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...y question. About a year ago there was a fix of some obscure bug (rdar://problem/8030636 which is located on the internal Apple bugtracker I believe and so not available to the general public :)) Some discussion can be found here: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20100531/102160.html. Unfortunately, no real testcase is provided, just abstract scenario description. Basically a EFLAGS-clobbering instruction is not sunk if EFLAGS might be live out of the current block and since a conditional branch doesn't mark its EFLAGS use as a kill, that effectively means it is never...

...estion. About a year ago there was a fix of some obscure bug (rdar://problem/8030636 which is located on the internal Apple bugtracker I believe and so not available to the general public J) > Some discussion can be found here: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20100531/102160.html. Unfortunately, no real testcase is provided, just abstract scenario description. > > Basically a EFLAGS-clobbering instruction is not sunk if EFLAGS might be live out of the current block and since a conditional branch doesn’t mark its EFLAGS use as a kill, that effectively means it i...

...stion. > About a year ago there was a fix of some obscure bug (rdar://problem/8030636 which is located on the internal Apple bugtracker I believe and so not available to the general public J) Some discussion can be found here: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20100531/102160.html. Unfortunately, no real testcase is provided, just abstract scenario description. > > Basically a EFLAGS-clobbering instruction is not sunk if EFLAGS might be live out of the current block and since a conditional branch doesn't mark its EFLAGS use as a kill, that effectively means...