> Michael Eager writes:
Michael> Can someone explain to me why FP regs should contain int values?
Michael> Is this to support the fcfid conversion instruction?
Yes, for FP conversion instructions.
Michael> What keeps FP regs from being used to contain integer values?
Nothin
rs6000.c contains the following:
rs6000_hard_regno_mode_ok (int regno, enum machine_mode mode)
{
. . .
/* The float registers can only hold floating modes and DImode. */
if (FP_REGNO_P (regno))
return
(GET_MODE_CLASS (mode) == MODE_FLOAT
&& FP_REGNO_P (regno + HARD_REGNO_
