Re: IRA has been merged into trunk

["Andrew Pinski" <pinskia@gmail.com>]

On Tue, Aug 26, 2008 at 5:40 AM, Vladimir Makarov <vmakarov@redhat.com> wrote:
>  Recently I got an approval of the last part of IRA -- reload
> changes.  Therefore I've just merged IRA into mainline.

This causes the PowerPC64 testcase gcc.target/powerpc/ppc64-double-1.c
to fail.  This was added to make sure that the register allocator
would get the correct answer of using the floating point registers for
fix_truncdfdi2 and floatdidf2.
Which have the following constraints:
"!f#r"

Before the register allocator we have:
(insn:HI 6 7 12 2
gcc/gcc/testsuite/gcc.target/powerpc/ppc64-double-1.c:9 (set (reg:DI
122)
        (fix:DI (reg:DF 33 1 [ d ]))) 267 {fix_truncdfdi2}
(expr_list:REG_DEAD (reg:DF 33 1 [ d ])
        (nil)))

(insn:HI 12 6 18 2
gcc/gcc/testsuite/gcc.target/powerpc/ppc64-double-1.c:11 (set
(reg/i:DF 33 1)
        (float:DF (reg:DI 122))) 263 {floatdidf2} (expr_list:REG_DEAD
(reg:DI 122)
        (nil)))

IRA says:
Pass 0 for finding allocno costs

    a0 (r122,l0) best GENERAL_REGS, cover GENERAL_REGS

Which is wrong as FLOAT_REGS is still better as both instruction take
FLOAT_REGS but is discouraged.

Thanks,
Andrew Pinski