llvm-arrays-2.ll

gistfile1.ll

; int n = 25;
; int[] a = new int[n];
; return a.length;

; Generates this:
; ......

entry0:

;;; int n = 25;

  %"$0_n" = alloca i32
  store i32 25, i32* %"$0_n"
  
;;; int[] a = new int[n];
;;;   "new int[n]" returns a struct at r_astruct_10
  %r0 = load i32, i32* %"$0_n"
  %r_size_1 = getelementptr i32, i32* null, i32 1
  %r_sizeof_2 = ptrtoint i32* %r_size_1 to i32
  %r_len_3 = sext i32 %r0 to i64
  %r_size_4 = sext i32 %r_sizeof_2 to i64
  %r5 = call i8* @calloc(i64 %r_len_3, i64 %r_size_4)
  %r_addr_6 = bitcast i8* %r5 to i32*
  %r_astructptr_7 = alloca { i32, i32* }
  %r_alenptr_8 = getelementptr { i32, i32* }, { i32, i32* }* %r_astructptr_7, i32 0, i32 0
  store i32 %r0, i32* %r_alenptr_8
  %r_aptr_9 = getelementptr { i32, i32* }, { i32, i32* }* %r_astructptr_7, i32 0, i32 1
  store i32* %r_addr_6, i32** %r_aptr_9
  %r_astruct_10 = load { i32, i32* }, { i32, i32* }* %r_astructptr_7
  
;;;   "int[] a =" stores the struct %r_astruct_10 in %"$1_a"
  %"$1_a" = alloca { i32, i32* }
  store { i32, i32* } %r_astruct_10, { i32, i32* }* %"$1_a"
  
;;; return a.length;
  %r_alenptr_11 = getelementptr { i32, i32* }, { i32, i32* }* %"$1_a", i32 0, i32 0
  %r_alen_12 = load i32, i32* %r_alenptr_11
  ret i32 %r_alen_12
  
 ; .....