Optimization Topics/Exercise 01: Difference between revisions

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   return c;
   return c;
}
}
</source>
Instruções Postfix:
<source lang="text">
directivas: text data rodata bss align label extrn globl const str char id byte double
acesso: addr addra addrv local loca locv load load2 ldchr store store2 stchr
          alloc dup swap push pop int sp
aritmética/lógica: add dadd sub dsub mul dmul div ddiv mod neg gt ge lt le eq ne cmp
bit a bit: rotl rotr shtl shtru shtrs and or not xor
funções/saltos: call ret start enter leave trash jmp jz jnz branch leap
</source>
</source>

Latest revision as of 18:05, 14 May 2019

Considere a seguinte função em C:

  1. Que optimizações independentes da máquina são possíveis?
  2. Traduza-a para Postfix optimizado.
int *fun(int *a, int *b) {
  int *c = (int *)malloc(160 * 4), i, j;
  for (j = 0; j < 40; ++j)
    for (i = 0; i < 4; ++i)
      c[i+j*4] = a[i+j*4] + b[i*40+j] + 100*j;
  return c;
}