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...k. But how can that happen? I think the only way for it is when EFLAGS def and use are located in different blocks but that is impossible with current instruction selector. Or am I wrong? A little later another fix has been made (http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20100614/102554.html) which restricts the problem only to cases when the blocks are produced by lowering a SELECT instruction. It is even more confusing. How is it different from the other scenario wrt. EFLAGS use? Moreover, pseudo cmov is marked as clobbering EFLAGS so how can it be used further in the code? Are...

...can that happen? I think the only way for it is when EFLAGS def and use are located in different blocks but that is impossible with current instruction selector. Or am I wrong? > > A little later another fix has been made (http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20100614/102554.html) which restricts the problem only to cases when the blocks are produced by lowering a SELECT instruction. It is even more confusing. How is it different from the other scenario wrt. EFLAGS use? Moreover, pseudo cmov is marked as clobbering EFLAGS so how can it be used further in the code? >...

...can that happen? I think the only way for it is when EFLAGS def and use are located in different blocks but that is impossible with current instruction selector. Or am I wrong? > > A little later another fix has been made (http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20100614/102554.html) which restricts the problem only to cases when the blocks are produced by lowering a SELECT instruction. It is even more confusing. How is it different from the other scenario wrt. EFLAGS use? Moreover, pseudo cmov is marked as clobbering EFLAGS so how can it be used further in the code? >...