[Mingw-notify] [ mingw-Bugs-954548 ] gcc: internal compiler error: in extract_insn

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Bugs item #954548, was opened at 2004-05-16 06:49
Message generated for change (Comment added) made by dannysmith
You can respond by visiting: 
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Category: gcc
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: vlada (vladakk)
Assigned to: Danny Smith (dannysmith)
Summary: gcc: internal compiler error: in extract_insn

Initial Comment:
internal compiler error: in extract_insn

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>Comment By: Danny Smith (dannysmith)
Date: 2004-05-16 20:11

Message:
Logged In: YES 
user_id=11494

Thanks for the detailed information on the bug.  It really does 
help.

Confirmed at -O1.
Here is reduced testcase:
/* test1.c */
typedef struct _foo
{
  unsigned long _bkgd;
} FOO;

void wbkgdset (FOO* foo, unsigned long ch)
{
  unsigned long bkgdattr;

  if ( (ch & 0xFFFF0000UL) == 0UL )
    bkgdattr = 0x0000000UL;
  else
    bkgdattr = (ch & 0xFFFF0000UL);

  foo->_bkgd = (ch | bkgdattr);
}


D:\>gcc  -O1 -S -Wall  test1.c 
test1.c: In function `wbkgdset':
test1.c:17: error: unrecognizable insn:
(insn 36 11 23 0 (set (reg/v:SI 60 [ bkgdattr ])
        (and:SI (reg/v:SI 59 [ ch ])
            (const_int -65536 [0xffff0000]))) -1 (nil)
    (nil))
test1.c:17: internal compiler error: in extract_insn, at 
recog.c:2083
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.mingw.org/bugs.shtml> for instructions.


The testcase compiles okay at -O0 and at -O2 and -O3.
It also compiles OK if you clean up the if...else condition to
simply 
bkgdattr = (ch & 0xFFFF0000UL);

I'll forward the bug report to GCC bugzilla
Danny

----------------------------------------------------------------------

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