http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53908
--- Comment #5 from Mikael Pettersson <mikpe at it dot uu.se> 2012-07-10 22:50:24 UTC --- On x86_64-linux the SEGV went away on trunk with r186159: http://gcc.gnu.org/ml/gcc-cvs/2012-04/msg00108.html http://gcc.gnu.org/ml/gcc-patches/2012-04/msg00202.html The patch description makes it sound more like a cleanup than fixing actual bugs, but when I diff the assembly code for the test case with r186158 and r186159 I see: --- pr53908.s-r186158 2012-07-11 00:28:57.000000000 +0200 +++ pr53908.s-r186159 2012-07-11 00:34:32.000000000 +0200 ... call is_basic testl %eax, %eax - movq 8(%rsp), %rbp - js .L68 -.L29: + js .L29 +.L33: movq users(%rip), %rbx + movq 8(%rsp), %rbp testq %rbx, %rbx ... That is, a load is being moved across a control flow insn. All other diffs seem to just be changed label numbers. I'll give it some more testing tomorrow.
