ssa-pre-2.c

来自「Mac OS X 10.4.9 for x86 Source Code gcc」· C语言 代码 · 共 21 行

/* { dg-do compile } */ 
/* { dg-options "-O2 -fdump-tree-pre-stats" } */
int motion_test1(int data, int data_0, int data_3, int v)
{
	int i;
	int t, u;

	if (data)
		i = data_0 + data_3;
	else {
		v = 2;
		i = 5;
	}
	t = data_0 + data_3;
	u = i;
	return v * t * u;
}
/* We should eliminate one computation of data_0 + data_3 along the 
   main path, causing one reload. */
/* { dg-final { scan-tree-dump-times "Eliminated:1" 1 "pre"} } */