Re: HARD_REGNO_MODE_OK on PA-RISC (revisited)

[Mark Klein <mklein@dis.com>]

At 08:37 PM 8/24/99 -0600, Jeffrey A Law wrote:

>There is nothing wrong with requiring aligned registers, it is just
suboptimal.

The original question had to do with long double which according to the ACD
must be aligned on a 128 bit boundary. This is what works for long double.
If I'm missing something else, please refresh my memory, as it has been
over four months since I looked at this.

/* 
 * Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
 * 32 bit reg/subreg can fit in any general register. On PA1.0, FP regs
 * are 64 bits wide, but 32 bit quantities must be in the leftmost 32
 * bits of the FP register. On PA1.1, FP regs are still 64 bits wide,
 * but both halves can contain 32 bit quantities. In gcc, these registers
 * are each treated as a separate 32 bit FP register. So, modes greater
 * than 32 bits must be aligned on "even" registers. 128 bit floating
 * point must be aligned in evenly aligned FP registers on PA 1.0 and
 * because of the remapping for PA1.1, registers evenly divisible by 4.
 * For PA 1.0, disallow wide non-floating point modes in FP registers.
 */
#define HARD_REGNO_MODE_OK(REGNO, MODE) \
  ((REGNO) == 0                                                         \
    ? (MODE) == CCmode || (MODE) == CCFPmode                            \
    : FP_REGNO_P (REGNO)                                                \
       ? !TARGET_PA_11                                                  \
          ? GET_MODE_SIZE (MODE) <= 4 ||                                \
            GET_MODE_CLASS (MODE) == MODE_FLOAT &&                      \
            (GET_MODE_SIZE (MODE) <= 8 && ((REGNO) & 1) == 0 ||         \
            ((REGNO) & 3) == 0)                                         \
          : GET_MODE_SIZE (MODE) <= 4  ||                               \
            (GET_MODE_SIZE (MODE) <= 8 && ((REGNO) & 1) == 0) ||        \
            ((REGNO) & 3) == 0                                          \
       : 1)


--
Mark Klein                                 DIS International, Ltd.
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