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expr.c (emit_move_insn_1): If there is no move pattern for the original mode...

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* expr.c (emit_move_insn_1): If there is no move pattern for the
	original mode, try using a pattern for the corresponding integer mode.

From-SVN: r71816
This commit is contained in:
Richard Sandiford 2003-09-26 06:08:48 +00:00 committed by Richard Sandiford
parent 9eb5455884
commit 5581fc9110
2 changed files with 16 additions and 0 deletions

5
gcc/ChangeLog

@ -1,3 +1,8 @@
2003-09-26 Richard Sandiford <rsandifo@redhat.com>
* expr.c (emit_move_insn_1): If there is no move pattern for the
original mode, try using a pattern for the corresponding integer mode.
2003-09-26 Richard Sandiford <rsandifo@redhat.com>
* combine.c (if_then_else_cond): Tighten mode check.

11
gcc/expr.c

@ -3491,6 +3491,17 @@ emit_move_insn_1 (rtx x, rtx y)
return emit_insn (GEN_FCN (insn_code) (x, y));
}
/* Try using a move pattern for the corresponding integer mode. This is
only safe when simplify_subreg can convert MODE constants into integer
constants. At present, it can only do this reliably if the value
fits within a HOST_WIDE_INT. */
else if (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
&& (submode = int_mode_for_mode (mode)) != BLKmode
&& mov_optab->handlers[submode].insn_code != CODE_FOR_nothing)
return emit_insn (GEN_FCN (mov_optab->handlers[submode].insn_code)
(simplify_gen_subreg (submode, x, mode, 0),
simplify_gen_subreg (submode, y, mode, 0)));
/* This will handle any multi-word or full-word mode that lacks a move_insn
pattern. However, you will get better code if you define such patterns,
even if they must turn into multiple assembler instructions. */