+2014-01-15 Jeff Law <law@redhat.com>
+
+ PR tree-optimization/59747
+ * ree.c (find_and_remove_re): Properly handle case where a second
+ eliminated extension requires widening a copy created for elimination
+ of a prior extension.
+ (combine_set_extension): Ensure that the number of hard regs needed
+ for a destination register does not change when we widen it.
+
2014-01-15 Sebastian Huber <sebastian.huber@embedded-brains.de>
* config.gcc (*-*-rtems*): Add t-rtems to tmake_file.
else
new_reg = gen_rtx_REG (cand->mode, REGNO (SET_DEST (*orig_set)));
+ /* We're going to be widening the result of DEF_INSN, ensure that doing so
+ doesn't change the number of hard registers needed for the result. */
+ if (HARD_REGNO_NREGS (REGNO (new_reg), cand->mode)
+ != HARD_REGNO_NREGS (REGNO (orig_src), GET_MODE (SET_DEST (*orig_set))))
+ return false;
+
/* Merge constants by directly moving the constant into the register under
some conditions. Recall that RTL constants are sign-extended. */
if (GET_CODE (orig_src) == CONST_INT
for (unsigned int i = 0; i < reinsn_copy_list.length (); i += 2)
{
rtx curr_insn = reinsn_copy_list[i];
+ rtx def_insn = reinsn_copy_list[i + 1];
+
+ /* Use the mode of the destination of the defining insn
+ for the mode of the copy. This is necessary if the
+ defining insn was used to eliminate a second extension
+ that was wider than the first. */
+ rtx sub_rtx = *get_sub_rtx (def_insn);
rtx pat = PATTERN (curr_insn);
- rtx new_reg = gen_rtx_REG (GET_MODE (SET_DEST (pat)),
+ rtx new_dst = gen_rtx_REG (GET_MODE (SET_DEST (sub_rtx)),
REGNO (XEXP (SET_SRC (pat), 0)));
- rtx set = gen_rtx_SET (VOIDmode, new_reg, SET_DEST (pat));
- emit_insn_after (set, reinsn_copy_list[i + 1]);
+ rtx new_src = gen_rtx_REG (GET_MODE (SET_DEST (sub_rtx)),
+ REGNO (SET_DEST (pat)));
+ rtx set = gen_rtx_SET (VOIDmode, new_dst, new_src);
+ emit_insn_after (set, def_insn);
}
/* Delete all useless extensions here in one sweep. */