diff options
Diffstat (limited to 'gcc/testsuite/g++.old-deja/g++.other/perf1.C')
| -rw-r--r-- | gcc/testsuite/g++.old-deja/g++.other/perf1.C | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.old-deja/g++.other/perf1.C b/gcc/testsuite/g++.old-deja/g++.other/perf1.C new file mode 100644 index 00000000000..3f898117511 --- /dev/null +++ b/gcc/testsuite/g++.old-deja/g++.other/perf1.C @@ -0,0 +1,78 @@ +// Build don't link: + +// Test of severe performance regression from 2.95. This code generates +// a heavily self-referential tree which caused the inliner to take +// O(3**N) time to scan it for function calls. +// Reported by Kelley Cook <kelley.cook@home.com>. PR c++/1687. + +bool in0 ; +bool in1 ; +bool in2 ; +bool in3 ; +bool in4 ; +bool in5 ; +bool in6 ; +bool in7 ; +bool in8 ; +bool in9 ; +bool in10; +bool in11; +bool in12; +bool in13; +bool in14; +bool in15; +bool in16; +bool in17; +bool in18; +bool in19; +bool in20; +bool in21; +bool in22; +bool in23; +bool in24; +bool in25; +bool in26; +bool in27; +bool in28; +bool in29; +bool in30; +bool in31; +unsigned long output; + +void mux(void) +{ + output = + (in0 ? 0x00000001 : 0) | + (in1 ? 0x00000002 : 0) | + (in2 ? 0x00000004 : 0) | + (in3 ? 0x00000008 : 0) | + (in4 ? 0x00000010 : 0) | + (in5 ? 0x00000020 : 0) | + (in6 ? 0x00000040 : 0) | + (in7 ? 0x00000080 : 0) | + (in8 ? 0x00000100 : 0) | + (in9 ? 0x00000200 : 0) | + (in10 ? 0x00000400 : 0) | + (in11 ? 0x00000800 : 0) | + (in12 ? 0x00001000 : 0) | + (in13 ? 0x00002000 : 0) | + (in14 ? 0x00004000 : 0) | + (in15 ? 0x00008000 : 0) | + (in16 ? 0x00010000 : 0) | + (in17 ? 0x00020000 : 0) | + (in18 ? 0x00040000 : 0) | + (in19 ? 0x00080000 : 0) | + (in20 ? 0x00100000 : 0) | + (in21 ? 0x00200000 : 0) | + (in22 ? 0x00400000 : 0) | + (in23 ? 0x00800000 : 0) | + (in24 ? 0x01000000 : 0) | + (in25 ? 0x02000000 : 0) | + (in26 ? 0x04000000 : 0) | + (in27 ? 0x08000000 : 0) | + (in28 ? 0x10000000 : 0) | + (in29 ? 0x20000000 : 0) | + (in30 ? 0x40000000 : 0) | + (in31 ? 0x80000000 : 0) ; +} + |