diff options
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 70a0d18bcb5..9ee5f29883d 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -1,7 +1,7 @@ /* Medium-level subroutines: convert bit-field store and extract and shifts, multiplies and divides to rtl instructions. Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, - 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 + 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. This file is part of GCC. @@ -532,6 +532,7 @@ store_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize, int icode = optab_handler (movstrict_optab, fieldmode)->insn_code; rtx insn; rtx start = get_last_insn (); + rtx arg0 = op0; /* Get appropriate low part of the value being stored. */ if (GET_CODE (value) == CONST_INT || REG_P (value)) @@ -552,11 +553,11 @@ store_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize, gcc_assert (GET_MODE (SUBREG_REG (op0)) == fieldmode || GET_MODE_CLASS (fieldmode) == MODE_INT || GET_MODE_CLASS (fieldmode) == MODE_PARTIAL_INT); - op0 = SUBREG_REG (op0); + arg0 = SUBREG_REG (op0); } insn = (GEN_FCN (icode) - (gen_rtx_SUBREG (fieldmode, op0, + (gen_rtx_SUBREG (fieldmode, arg0, (bitnum % BITS_PER_WORD) / BITS_PER_UNIT + (offset * UNITS_PER_WORD)), value)); @@ -748,6 +749,16 @@ store_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize, if (pat) { emit_insn (pat); + + /* If the mode of the insertion is wider than the mode of the + target register we created a paradoxical subreg for the + target. Truncate the paradoxical subreg of the target to + itself properly. */ + if (!TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (GET_MODE (op0)), + GET_MODE_BITSIZE (op_mode)) + && (REG_P (xop0) + || GET_CODE (xop0) == SUBREG)) + convert_move (op0, xop0, true); return true; } delete_insns_since (last); |