GCC is a widely used open source compiler system developed by the GNU Project. It compiles C, C++, Java, Fortran and other languages. GCC has undergone major changes to its structure since 2005, including the addition of GENERIC and GIMPLE intermediate representations between the front end and back end. The front end parses source code into ASTs, then GIMPLE trees are optimized through many passes in the middle end before being converted to RTL for the back end code generation.

1. GCC : GNU compilers collection Alberto Bustamante Reyes ( www.albertobustamante.com ) Author:

3. Distributed by FSF under GPL License

4. Written in C / C++

5. Default compiler for Unix and Mac OS X

6. Also ported to Windows (MinGW)

9. Java (gcj)

10. Objective-C / Objective-C++ (gobjc / gobjc++ )

11. Fortran (gfortran)

14. Middle end

15. Back end

26. Single Static Assignment

27. Example: y := 1 y := 2 x := y y1 := 1 y2 := 2 x1 := y2

28. Structure: Middle end GIMPLE Tree SSA Optimizer RTL

31. Partial redundancy elimination if (some_condition) { // some code y = x + 4; }else { // other code } z = x + 4; if (some_condition) { // some code y = x + 4; t = y; }else { // other code t = x + 4; } z = t;

33. Partial redundancy elimination

34. Global value numbering w := 3 x := 3 y := x + 4 z := w + 4 w := 3 x := w y := w + 4 z := y

36. Partial redundancy elimination

37. Global value numbering

38. Sparse conditional constant propagation

40. Partial redundancy elimination

41. Global value numbering

42. Sparse conditional constant propagation

43. Scalar replacement of aggregates

45. Processor dependent

46. Looks like Lisp S-expressions: (set:SI (reg:SI 140) (plus:SI (reg:SI 138) (reg:SI 139)))

47. Structure: summary Source code AST GENERIC GIMPLE Tree SSA Optimizer RTL Optimized RTL Object code FRONT END MIDDLE END BACK END

49. Active and noumerous developer team

50. One of the most popular compilers

52. Free!!

54. GCC Wiki : http://gcc.gnu.org/wiki

55. SSA Tree Project: http://gcc.gnu.org/projects/tree-ssa/

56. GNU : http://www.gnu.org

57. Free Software Foundation : http://www.fsf.org

58. MinGW: http://www.mingw.org

59. The End Thanks for watching

60. GCC : GNU compilers collection Alberto Bustamante Reyes ( www.albertobustamante.com ) Author: