https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70288
--- Comment #1 from Andrey Tarasevich <tarasevich at cs dot uni-saarland.de> --- Created attachment 38014 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38014&action=edit test case with compile-time-hog Same test case, but with line 28 removed (attached as test_case_2.i) takes 42 mins to compile with GCC 5.3.0, but crashes with GCC 4.8.2. Should I file a separate bug report? ../build/gcc_530_clean_bin/bin/gcc -fno-tree-dominator-opts -O1 -save-temps -ftime-report test_case_2.c Execution times (seconds) phase setup : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 1093 kB ( 0%) ggc phase opt and generate :2529.12 (100%) usr 1.99 (100%) sys2535.52 (100%) wall 1802260 kB (100%) ggc garbage collection : 1.17 ( 0%) usr 0.00 ( 0%) sys 1.16 ( 0%) wall 0 kB ( 0%) ggc ipa pure const : 0.48 ( 0%) usr 0.00 ( 0%) sys 0.49 ( 0%) wall 3 kB ( 0%) ggc cfg construction : 0.29 ( 0%) usr 0.00 ( 0%) sys 0.28 ( 0%) wall 0 kB ( 0%) ggc cfg cleanup :1031.96 (41%) usr 0.07 ( 4%) sys1033.73 (41%) wall 0 kB ( 0%) ggc trivially dead code : 1.52 ( 0%) usr 0.00 ( 0%) sys 1.54 ( 0%) wall 0 kB ( 0%) ggc df scan insns : 1.13 ( 0%) usr 0.14 ( 7%) sys 1.27 ( 0%) wall 0 kB ( 0%) ggc df multiple defs : 0.67 ( 0%) usr 0.04 ( 2%) sys 0.70 ( 0%) wall 0 kB ( 0%) ggc df reaching defs : 0.02 ( 0%) usr 0.02 ( 1%) sys 0.03 ( 0%) wall 0 kB ( 0%) ggc df live regs : 2.94 ( 0%) usr 0.02 ( 1%) sys 2.95 ( 0%) wall 0 kB ( 0%) ggc df live&initialized regs: 1.41 ( 0%) usr 0.09 ( 5%) sys 1.51 ( 0%) wall 0 kB ( 0%) ggc df reg dead/unused notes: 3.09 ( 0%) usr 0.00 ( 0%) sys 3.10 ( 0%) wall 61256 kB ( 3%) ggc register information : 0.35 ( 0%) usr 0.00 ( 0%) sys 0.35 ( 0%) wall 0 kB ( 0%) ggc alias analysis : 1.83 ( 0%) usr 0.00 ( 0%) sys 1.83 ( 0%) wall 49152 kB ( 3%) ggc register scan : 0.15 ( 0%) usr 0.00 ( 0%) sys 0.16 ( 0%) wall 0 kB ( 0%) ggc rebuild jump labels : 0.49 ( 0%) usr 0.00 ( 0%) sys 0.50 ( 0%) wall 0 kB ( 0%) ggc tree CFG cleanup : 2.57 ( 0%) usr 0.00 ( 0%) sys 2.57 ( 0%) wall 2 kB ( 0%) ggc tree SSA rewrite : 3.23 ( 0%) usr 0.01 ( 1%) sys 3.23 ( 0%) wall 1 kB ( 0%) ggc tree SSA incremental : 4.11 ( 0%) usr 0.21 (11%) sys 4.21 ( 0%) wall 38823 kB ( 2%) ggc tree operand scan : 0.06 ( 0%) usr 0.05 ( 3%) sys 0.19 ( 0%) wall 5 kB ( 0%) ggc tree split crit edges : 0.67 ( 0%) usr 0.04 ( 2%) sys 0.71 ( 0%) wall 110287 kB ( 6%) ggc tree reassociation : 0.23 ( 0%) usr 0.00 ( 0%) sys 0.24 ( 0%) wall 0 kB ( 0%) ggc tree linearize phis : 0.05 ( 0%) usr 0.00 ( 0%) sys 0.05 ( 0%) wall 1 kB ( 0%) ggc tree forward propagate : 0.44 ( 0%) usr 0.00 ( 0%) sys 0.45 ( 0%) wall 0 kB ( 0%) ggc tree aggressive DCE :1416.89 (56%) usr 0.07 ( 4%) sys1419.48 (56%) wall 16382 kB ( 1%) ggc tree DSE : 0.08 ( 0%) usr 0.00 ( 0%) sys 0.09 ( 0%) wall 0 kB ( 0%) ggc tree loop invariant motion: 0.34 ( 0%) usr 0.00 ( 0%) sys 0.34 ( 0%) wall 0 kB ( 0%) ggc complete unrolling : 1.31 ( 0%) usr 0.27 (14%) sys 1.63 ( 0%) wall 382276 kB (21%) ggc tree rename SSA copies : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall 0 kB ( 0%) ggc dominance frontiers : 0.14 ( 0%) usr 0.01 ( 1%) sys 0.17 ( 0%) wall 0 kB ( 0%) ggc dominance computation : 2.32 ( 0%) usr 0.05 ( 3%) sys 2.34 ( 0%) wall 0 kB ( 0%) ggc out of ssa : 0.11 ( 0%) usr 0.00 ( 0%) sys 0.11 ( 0%) wall 0 kB ( 0%) ggc expand vars : 0.31 ( 0%) usr 0.00 ( 0%) sys 0.30 ( 0%) wall 0 kB ( 0%) ggc expand : 1.45 ( 0%) usr 0.18 ( 9%) sys 1.64 ( 0%) wall 471768 kB (26%) ggc post expand cleanups : 0.69 ( 0%) usr 0.00 ( 0%) sys 0.70 ( 0%) wall 0 kB ( 0%) ggc lower subreg : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall 0 kB ( 0%) ggc forward prop : 3.06 ( 0%) usr 0.03 ( 2%) sys 3.10 ( 0%) wall 40837 kB ( 2%) ggc CSE : 3.61 ( 0%) usr 0.00 ( 0%) sys 3.62 ( 0%) wall 0 kB ( 0%) ggc dead code elimination : 0.42 ( 0%) usr 0.00 ( 0%) sys 0.42 ( 0%) wall 0 kB ( 0%) ggc dead store elim1 : 1.65 ( 0%) usr 0.14 ( 7%) sys 1.80 ( 0%) wall 30628 kB ( 2%) ggc dead store elim2 : 1.53 ( 0%) usr 0.01 ( 1%) sys 1.54 ( 0%) wall 10209 kB ( 1%) ggc loop analysis : 0.03 ( 0%) usr 0.01 ( 1%) sys 0.03 ( 0%) wall 0 kB ( 0%) ggc loop init : 1.21 ( 0%) usr 0.00 ( 0%) sys 1.20 ( 0%) wall 2600 kB ( 0%) ggc loop fini : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 0 kB ( 0%) ggc branch prediction : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 5 kB ( 0%) ggc combiner : 13.46 ( 1%) usr 0.01 ( 1%) sys 13.49 ( 1%) wall 187171 kB (10%) ggc if-conversion : 0.53 ( 0%) usr 0.03 ( 2%) sys 0.59 ( 0%) wall 0 kB ( 0%) ggc integrated RA : 8.37 ( 0%) usr 0.24 (12%) sys 8.63 ( 0%) wall 339539 kB (19%) ggc LRA non-specific : 5.62 ( 0%) usr 0.06 ( 3%) sys 5.71 ( 0%) wall 20418 kB ( 1%) ggc LRA virtuals elimination: 0.61 ( 0%) usr 0.02 ( 1%) sys 0.63 ( 0%) wall 20418 kB ( 1%) ggc LRA create live ranges : 1.01 ( 0%) usr 0.03 ( 2%) sys 1.03 ( 0%) wall 10209 kB ( 1%) ggc reload : 0.08 ( 0%) usr 0.01 ( 1%) sys 0.09 ( 0%) wall 0 kB ( 0%) ggc reload CSE regs : 1.32 ( 0%) usr 0.00 ( 0%) sys 1.32 ( 0%) wall 10209 kB ( 1%) ggc thread pro- & epilogue : 0.19 ( 0%) usr 0.00 ( 0%) sys 0.19 ( 0%) wall 0 kB ( 0%) ggc if-conversion 2 : 0.23 ( 0%) usr 0.00 ( 0%) sys 0.25 ( 0%) wall 0 kB ( 0%) ggc combine stack adjustments: 0.19 ( 0%) usr 0.00 ( 0%) sys 0.19 ( 0%) wall 0 kB ( 0%) ggc hard reg cprop : 0.32 ( 0%) usr 0.10 ( 5%) sys 0.42 ( 0%) wall 0 kB ( 0%) ggc machine dep reorg : 0.04 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall 0 kB ( 0%) ggc shorten branches : 0.29 ( 0%) usr 0.00 ( 0%) sys 0.29 ( 0%) wall 0 kB ( 0%) ggc final : 0.70 ( 0%) usr 0.02 ( 1%) sys 0.72 ( 0%) wall 2 kB ( 0%) ggc straight-line strength reduction: 0.18 ( 0%) usr 0.00 ( 0%) sys 0.17 ( 0%) wall 0 kB ( 0%) ggc rest of compilation : 1.75 ( 0%) usr 0.00 ( 0%) sys 1.76 ( 0%) wall 15 kB ( 0%) ggc remove unused locals : 0.08 ( 0%) usr 0.00 ( 0%) sys 0.08 ( 0%) wall 0 kB ( 0%) ggc unaccounted todo : 0.00 ( 0%) usr 0.01 ( 1%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc repair loop structures : 0.06 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 0%) wall 0 kB ( 0%) ggc TOTAL :2529.12 1.99 2535.52 1803451 kB
