pike.git/ src/ interpret_functions.h

2001-06-16

2001-06-16 17:07:44 by Per Hedbor <ph@opera.com>

• b1d0688cd6a9d1dac30da9466079eca2c2c8eb88 (19 lines) (+18/-1) ^{[ Show | Annotate ]}
  Branch: 7.9

Optimized the common case int_variable += integer about 30-50%. Non-integer += is ~1% slower (not counting the actual operation, I tried with string s; (do 1M times) s+="").

Rev: src/interpret_functions.h:1.59

1:   /* -  * $Id: interpret_functions.h,v 1.58 2001/06/10 00:24:17 grubba Exp $ +  * $Id: interpret_functions.h,v 1.59 2001/06/16 17:07:44 per Exp $    *    * Opcode definitions for the interpreter.    */
475:    Pike_sp++;    lvalue_to_svalue_no_free(Pike_sp-2,Pike_sp-4);    +  if( Pike_sp[-1].type == PIKE_T_INT && +  Pike_sp[-2].type == PIKE_T_INT ) +  { + #ifdef AUTO_BIGNUM +  if(!INT_TYPE_ADD_OVERFLOW(Pike_sp[-1].u.integer, Pike_sp[-2].u.integer)) + #endif +  { +  /* Optimization for a rather common case. Makes it 30% faster. */ +  Pike_sp[-1].u.integer += Pike_sp[-2].u.integer; +  assign_lvalue(Pike_sp-4,Pike_sp-1); +  Pike_sp-=4; /* known integers and a lvalue */ +  goto add_and_pop_done; +  } +  }    /* this is so that foo+=bar (and similar things) will be faster, this    * is done by freeing the old reference to foo after it has been pushed    * on the stack. That way foo can have only 1 reference if we are lucky,
493:    f_add(2);    assign_lvalue(Pike_sp-3,Pike_sp-1);    pop_n_elems(3); +  add_and_pop_done: +  ; /* make gcc happy */   BREAK;      OPCODE1(F_GLOBAL_LVALUE, "& global")