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| author | Richard Sandiford <rsandifo@nildram.co.uk> | 2007-09-23 19:08:56 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2007-09-23 19:08:56 +0000 |
| commit | 208996c7d704f5f6f8454bf44d90377097ed8837 (patch) | |
| tree | 9293268eac64e17a465440936726ccb35d7c0668 /gcc/function.c | |
| parent | 4c4717752abbed17c278b44ba9891128a5c14e0d (diff) | |
| download | gcc-208996c7d704f5f6f8454bf44d90377097ed8837.zip gcc-208996c7d704f5f6f8454bf44d90377097ed8837.tar.gz gcc-208996c7d704f5f6f8454bf44d90377097ed8837.tar.bz2 | |
function.c (assign_parm_setup_block): Explicitly convert BLKmode parameters from word_mode to the subword type if...
gcc/
* function.c (assign_parm_setup_block): Explicitly convert BLKmode
parameters from word_mode to the subword type if such a truncation
is not a no-op.
From-SVN: r128696
Diffstat (limited to 'gcc/function.c')
| -rw-r--r-- | gcc/function.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gcc/function.c b/gcc/function.c index ffee598..5f2dd48 100644 --- a/gcc/function.c +++ b/gcc/function.c @@ -2591,7 +2591,21 @@ assign_parm_setup_block (struct assign_parm_data_all *all, #endif ) { - rtx reg = gen_rtx_REG (mode, REGNO (entry_parm)); + rtx reg; + + /* We are really truncating a word_mode value containing + SIZE bytes into a value of mode MODE. If such an + operation requires no actual instructions, we can refer + to the value directly in mode MODE, otherwise we must + start with the register in word_mode and explicitly + convert it. */ + if (TRULY_NOOP_TRUNCATION (size * BITS_PER_UNIT, BITS_PER_WORD)) + reg = gen_rtx_REG (mode, REGNO (entry_parm)); + else + { + reg = gen_rtx_REG (word_mode, REGNO (entry_parm)); + reg = convert_to_mode (mode, copy_to_reg (reg), 1); + } emit_move_insn (change_address (mem, mode, 0), reg); } |