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Date: Thu, 13 Jul 2006 12:45:00 -0000
From: Andrew Haley <aph@redhat.com>
To: "Petar Bajic" <petar.bajic@micronasnit.com>
Cc: <gcc-help@gcc.gnu.org>
Subject: Re: register usage
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Petar Bajic writes:
 > 
 > 
 > For this, I had to make two new register classes (machine has 32 regs and 
 > basicly just one reg class GENERAL_REGS)
 > I added two new classes: HI_REGS, and LO_REGS to "enum reg_classes" wich are 
 > lower and higher 16 regs of GENERAL_REGS.
 > REG_CLASS_CONTENTS is expanded with { 0xffff0000 } and { 0x0000ffff }
 > REG_CLASS_NAMES has two more names "HI_REGS" and "LO_REGS"
 > 
 > in machine.c file I modified  "reg_class_from_letter"  making letter 'j' and 
 > 'k' return HI_REGS and LO_REGS
 > 
 > in machine.md I finally wrote a rule that uses j and k regs to distinct 
 > input and output....
 > (define_insn "*movsicc_insn"
 >   [(set (match_operand:SI 0 "register_operand" "=j,j")
 >  (if_then_else:SI (match_operator 1 "comparison_operator" [(match_operand:SI 
 > 4 "register_operand" "=k,k") (const_int 0)])
 >     (match_operand:SI 2 "register_operand" "=d,d")
 >     (match_operand:SI 3 "register_operand" "=d,d")))]
 >   ""
 > "..."
 > 
 > and the error is:
 > ../../gcc/libgcc2.c:785: internal compiler error: in copy_to_mode_reg, at 
 > explow.c:581
 > 
 > what else do I have to do for this to work?

I would look in the debugger to see what copy_to_mode_reg was trying
to do.  

I suspect you haven't defined a pattern to move into one of the
register classes.

Andrew.