Re: Failed cross: Alpha->ARM

[Stephen Williams <steve at icarus dot icarus dot com>]

  Host: Alpha Linux RedHat 5.0
  Target: ARM Linux
  Problem: Constant greater than 2^32 generated in assembler file
  Suspected cause: Converting a -1 to 2^32 and then propogating the value.

Try this patch. (In spite of the name, it does apply to the egcs-1.0
sources.) As I understand it, it does indeed mess up detecting if the
constant that is can load in a simple instruction or requires more
complex handling. Here is a ChangeLog and the patch itself.

Mon Oct 20 08:49:16 1997  Stephen Williams  <steve@icarus.com>

       * gcc/config/arm/arm.c: Fixed problem with 64bit hosts generating
       bogus assembler for long long constants.


diff --exclude=*~ --exclude=*.orig --exclude=testsuite -Npcr 
egcs-971023/gcc/config/arm/arm.c ../egcs-971023/gcc/config/arm/arm.c
*** egcs-971023/gcc/config/arm/arm.c    Mon Aug 11 08:57:24 1997
--- ../egcs-971023/gcc/config/arm/arm.c Mon Oct 27 20:38:41 1997
*************** const_ok_for_arm (i)
*** 407,412 ****
--- 407,415 ----
  {
    unsigned HOST_WIDE_INT mask = ~0xFF;

+   if (i & ~(unsigned HOST_WIDE_INT) 0xffffffff)
+     return FALSE;
+
    /* Fast return for 0 and powers of 2 */
    if ((i & (i - 1)) == 0)
      return TRUE;

-- 
Steve Williams
steve@icarus.com
steve@picturel.com

"The woods are lovely, dark and deep.  But I have promises to keep,
And lines to code before I sleep, And lines to code before I sleep."