hppa: Don't allow large modes in hard registers

LRA has problems handling spills for OI and TI modes.  There are
issues with SUBREG support as well.

This change fixes gcc.c-torture/compile/pr92618.c with LRA.

2024-11-08  John David Anglin  <danglin@gcc.gnu.org>

gcc/ChangeLog:

	PR target/117238
	* config/pa/pa32-regs.h (PA_HARD_REGNO_MODE_OK): Don't allow
	mode size 32.  Limit mode size 16 in general registers to
	complex modes.

diff --git a/gcc/config/pa/pa32-regs.h b/gcc/config/pa/pa32-regs.h
index 3467e03afed79053e81346f4b78de325b35423bf..c9a27ef165873409c9d96fdef4babd248b86f666 100644 (file)
--- a/gcc/config/pa/pa32-regs.h
+++ b/gcc/config/pa/pa32-regs.h
@@ -187,10 +187,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    that includes the incoming arguments and the return value.  We specify a
    set with no overlaps so that we don't have to specify that the destination
    register is an early clobber in patterns using this mode.  Except for the
-   return value, the starting registers are odd.  For 128 and 256 bit modes,
-   we similarly specify non-overlapping sets of cpu registers.  However,
-   there aren't any patterns defined for modes larger than 64 bits at the
-   moment.
+   return value, the starting registers are odd.  Except for complex modes,
+   we don't allow modes larger than 64 bits in the general registers as there
+   are issues with copies, spills and SUBREG support.
 
    We limit the modes allowed in the floating point registers to the
    set of modes used in the machine definition.  In addition, we allow
@@ -217,15 +216,13 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      ? (VALID_FP_MODE_P (MODE)                                         \
        && (GET_MODE_SIZE (MODE) <= 4                                   \
            || (GET_MODE_SIZE (MODE) == 8 && ((REGNO) & 1) == 0)        \
-           || (GET_MODE_SIZE (MODE) == 16 && ((REGNO) & 3) == 0)       \
-           || (GET_MODE_SIZE (MODE) == 32 && ((REGNO) & 7) == 0)))     \
+           || (GET_MODE_SIZE (MODE) == 16 && ((REGNO) & 3) == 0)))     \
    : (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD                           \
       || (GET_MODE_SIZE (MODE) == 2 * UNITS_PER_WORD                   \
          && ((((REGNO) & 1) == 1 && (REGNO) <= 25) || (REGNO) == 28))  \
       || (GET_MODE_SIZE (MODE) == 4 * UNITS_PER_WORD                   \
-         && ((REGNO) & 3) == 3 && (REGNO) <= 23)                       \
-      || (GET_MODE_SIZE (MODE) == 8 * UNITS_PER_WORD                   \
-         && ((REGNO) & 7) == 3 && (REGNO) <= 19)))
+         && COMPLEX_MODE_P (MODE)                                      \
+         && ((REGNO) & 3) == 3 && (REGNO) <= 23)))
 
 /* How to renumber registers for gdb.