Re: Unaligned double

[law at redhat dot com]

  In message <4.2.0.58.20011015091248.00ad8690@dis.dis.com>you write:
  > Hi.
  > 
  > The following used to work on 2.95.x and fails on 3.0.x for PA 1.0
  > semantics:
  > 
  > class ua_double
  > {
  >      double l;
  > public:
  >     ua_double &operator =(double l_) { l = l_; return *this; };
  >     operator double () { return l; };
  > }__attribute__((aligned(2), packed));
  > 
  > void addHoldFile(void);
  > 
  > void addHoldFile ()
  > {
  >     double dpAmount;
  >     struct
  >     {
  >        long lVal;
  >        ua_double dpAmount;
  >     } saRec;
  > 
  >     dpAmount = saRec.dpAmount;
  > }
  > 
  > ...
  > 
  > (insn 28 26 30 (set (subreg:SI (reg:DF 96) 1)
  >          (reg:SI 102)) 68 {*pa.md:2088} (nil)
  >      (expr_list:REG_DEAD (reg:SI 102)
  >          (nil)))
  > 
  > which becomes:
  > 
  > (insn 68 28 65 (set (reg:SI 43 %fr9R [42])
  >          (reg:SI 21 %r21)) 68 {*pa.md:2088} (nil)
  >      (nil))
  > 
  > [snip]
  > 
  > test.cc: In member function `ua_double::operator double()':
  > test.cc:6: Insn does not satisfy its constraints:
  > 
  > (insn 68 28 30 (set (reg:SI 43 %fr9R [42])
  >          (reg:SI 21 %r21)) 68 {*pa.md:2088} (nil)
  >      (nil))
  > test.cc:6: Internal compiler error in extract_constrain_insn_cached, at rec
  > og.c
  >     :2133
  > Please submit a full bug report,
  > 
  > Note that I am using PA 1.0 as the architecture and %fr9R should not be
  > used. In fact:
  > 
  > regno: 43, not_usable: 1, used_by_other_reload: 0, mode: DF, mode_ok: 0
  > 
  > I can not figure out how or where %fr9R is getting emitted.
  > 
  > Any clues would be appreciated.
I'd start by looking to see if local, global or reload assigned %fr9R to
pseudo 96.  That will determine how to proceed.
jeff