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[11558.527680] ------------[ cut here ]------------ [11558.527708] kernel BUG at fs/btrfs/transaction.c:1337! [11558.527730] invalid opcode: 0000 [#1] PREEMPT SMP [11558.527764] CPU 1 [11558.527776] Modules linked in: loop nls_cp437 vfat fat dm_mod xfs exportfs jfs usb_storage uas fuse ext4 jbd2 mbcache snd_hda_codec_hdmi snd_hda_codec_realtek arc4 iwlwifi snd_hda_intel snd_hda_codec uvcvideo

OK, Let me describe. There is nothing wrong with if-conversion in LLVM. The algorithm implemented in LLVM can handle the if(???){do something} and if(???){do something}else{do something else} case very well. But it can handle complicated case like when there are a lot of gotos in the program. The more systematic way to do if-conversion is based on Hyperblock [Scott A. Mahlke et al 1992]

Hi, Are you guys interested in implementing if-conversion as a GSoC 2015 project? Last year, I did a literature review about approaches of if-conversion and the if-conversion in LLVM. This was the undergraduate thesis of my bachelor degree. It seems that, the if-conversion used in LLVM is a very simple approach instead of following the literature. So I want to implement the approaches in the