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tcg: Swap commutative double-word comparisons 

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2012-10-02 11:32:23 -07:00 committed by Aurelien Jarno
parent 1e484e61e2
commit 0bfcb86538
1 changed files with 26 additions and 0 deletions
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26
tcg/optimize.c
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@ -405,6 +405,22 @@ static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2)
return false;
}
static bool swap_commutative2(TCGArg *p1, TCGArg *p2)
{
int sum = 0;
sum += temps[p1[0]].state == TCG_TEMP_CONST;
sum += temps[p1[1]].state == TCG_TEMP_CONST;
sum -= temps[p2[0]].state == TCG_TEMP_CONST;
sum -= temps[p2[1]].state == TCG_TEMP_CONST;
if (sum > 0) {
TCGArg t;
t = p1[0], p1[0] = p2[0], p2[0] = t;
t = p1[1], p1[1] = p2[1], p2[1] = t;
return true;
}
return false;
}
/* Propagate constants and copies, fold constant expressions. */
static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
TCGArg *args, TCGOpDef *tcg_op_defs)
@ -483,6 +499,16 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
swap_commutative(args[0], &args[2], &args[4]);
swap_commutative(args[1], &args[3], &args[5]);
break;
case INDEX_op_brcond2_i32:
if (swap_commutative2(&args[0], &args[2])) {
args[4] = tcg_swap_cond(args[4]);
}
break;
case INDEX_op_setcond2_i32:
if (swap_commutative2(&args[1], &args[3])) {
args[5] = tcg_swap_cond(args[5]);
}
break;
default:
break;
}