Re: optimization/8634: [3.2/3.3 regression] incorrect code for inlining of memcpy under -O2

[Glen Nakamura <glen@imodulo.com>]

The following reply was made to PR optimization/8634; it has been noted by GNATS.

From: Glen Nakamura <glen@imodulo.com>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org
Cc:  
Subject: Re: optimization/8634: [3.2/3.3 regression] incorrect code for inlining of memcpy under -O2
Date: Sun, 23 Mar 2003 18:07:39 +0000

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 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8634
 
 Attached is an extended test case for constant initializers.
 
 
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 /* PR optimization/8634 */
 /* Contributed by Glen Nakamura <glen@imodulo.com> */
 
 extern void abort (void);
 
 struct foo {
   char a, b, c, d, e, f, g, h, i, j;
 };
 
 int test1 ()
 {
   const char X[8] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H' };
   char buffer[8];
   __builtin_memcpy (buffer, X, 8);
   if (buffer[0] != 'A' || buffer[1] != 'B'
       || buffer[2] != 'C' || buffer[3] != 'D'
       || buffer[4] != 'E' || buffer[5] != 'F'
       || buffer[6] != 'G' || buffer[7] != 'H')
     abort ();
   return 0;
 }
 
 int test2 ()
 {
   const char X[10] = { 'A', 'B', 'C', 'D', 'E' };
   char buffer[10];
   __builtin_memcpy (buffer, X, 10);
   if (buffer[0] != 'A' || buffer[1] != 'B'
       || buffer[2] != 'C' || buffer[3] != 'D'
       || buffer[4] != 'E' || buffer[5] != '\0'
       || buffer[6] != '\0' || buffer[7] != '\0'
       || buffer[8] != '\0' || buffer[9] != '\0')
     abort ();
   return 0;
 }
 
 int test3 ()
 {
   const struct foo X = { a : 'A', c : 'C', e : 'E', g : 'G', i : 'I' };
   char buffer[10];
   __builtin_memcpy (buffer, &X, 10);
   if (buffer[0] != 'A' || buffer[1] != '\0'
       || buffer[2] != 'C' || buffer[3] != '\0'
       || buffer[4] != 'E' || buffer[5] != '\0'
       || buffer[6] != 'G' || buffer[7] != '\0'
       || buffer[8] != 'I' || buffer[9] != '\0')
     abort ();
   return 0;
 }
 
 int test4 ()
 {
   const struct foo X = { .b = 'B', .d = 'D', .f = 'F', .h = 'H' , .j = 'J' };
   char buffer[10];
   __builtin_memcpy (buffer, &X, 10);
   if (buffer[0] != '\0' || buffer[1] != 'B'
       || buffer[2] != '\0' || buffer[3] != 'D'
       || buffer[4] != '\0' || buffer[5] != 'F'
       || buffer[6] != '\0' || buffer[7] != 'H'
       || buffer[8] != '\0' || buffer[9] != 'J')
     abort ();
   return 0;
 }
 
 int main ()
 {
   test1 (); test2 (); test3 (); test4 ();
   return 0;
 }
 
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