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From: "harmeeksingh at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/60220] Vectorization : simple loop : fails to vectorize
Date: Tue, 18 Feb 2014 03:16:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60220

--- Comment #3 from harmeeksingh at gmail dot com ---
It still does not vectorise after adding the recomended flag. But rewriting the
code the following way does. 

This is a bizare behavioir . My tests show that this is not an issue of gcc
rewriting it as a memset . If I change the value 0 to a array assignment it
still gives. From the output it does show that it is trying to assign FALSE. 

31: not vectorized: data ref analysis failed *D.2549_9 = 0;

31: not vectorized: data ref analysis failed *D.2549_9 = 0;

#include <stdio.h>
#include <stdint.h>
#define FALSE ((char )0)

struct test
{
  int            *copy;
};
typedef struct test test;

static inline 
foo1(int *a, unsigned int num)
{
  unsigned int cnt;
  for (cnt = 0; cnt < num ; cnt++)
    a[cnt] = FALSE;
}

typedef uintptr_t Datum;

void
foo(test  *__restrict c, unsigned int a, unsigned int num)
{
  foo1(c->copy, num); // This vectorizes. if we pass it to inline function 
}