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| author | bernds <bernds@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-11-15 17:54:55 +0000 |
|---|---|---|
| committer | bernds <bernds@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-11-15 17:54:55 +0000 |
| commit | e90b35dbc54c9f8f603007234afdfdf0b06e1a50 (patch) | |
| tree | ed7bccbea173d8f793358c56f13750e14c5d0c65 /gcc/tree-ssa-loop-ivopts.c | |
| parent | 2350f40cfcbcb46011c49792a1e8b16cea62751b (diff) | |
| download | gcc-e90b35dbc54c9f8f603007234afdfdf0b06e1a50.tar.gz | |
* tree-ssa-loop-ivopts.c (get_address_cost): Make sure memory
addresses we generate for testing are aligned.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@118863 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-ssa-loop-ivopts.c')
| -rw-r--r-- | gcc/tree-ssa-loop-ivopts.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/gcc/tree-ssa-loop-ivopts.c b/gcc/tree-ssa-loop-ivopts.c index b20c309a707..29885f2fac7 100644 --- a/gcc/tree-ssa-loop-ivopts.c +++ b/gcc/tree-ssa-loop-ivopts.c @@ -3318,7 +3318,8 @@ multiply_by_cost (HOST_WIDE_INT cst, enum machine_mode mode) return cost; } -/* Returns true if multiplying by RATIO is allowed in address. */ +/* Returns true if multiplying by RATIO is allowed in an address. Test the + validity for a memory reference accessing memory of mode MODE. */ bool multiplier_allowed_in_address_p (HOST_WIDE_INT ratio, enum machine_mode mode) @@ -3361,8 +3362,9 @@ multiplier_allowed_in_address_p (HOST_WIDE_INT ratio, enum machine_mode mode) /* Returns cost of address in shape symbol + var + OFFSET + RATIO * index. If SYMBOL_PRESENT is false, symbol is omitted. If VAR_PRESENT is false, - variable is omitted. The created memory accesses MODE. - + variable is omitted. Compute the cost for a memory reference that accesses + a memory location of mode MEM_MODE. + TODO -- there must be some better way. This all is quite crude. */ static unsigned @@ -3383,6 +3385,7 @@ get_address_cost (bool symbol_present, bool var_present, if (!initialized[mem_mode]) { HOST_WIDE_INT i; + HOST_WIDE_INT start = BIGGEST_ALIGNMENT / BITS_PER_UNIT; int old_cse_not_expected; unsigned sym_p, var_p, off_p, rat_p, add_c; rtx seq, addr, base; @@ -3393,22 +3396,22 @@ get_address_cost (bool symbol_present, bool var_present, reg1 = gen_raw_REG (Pmode, LAST_VIRTUAL_REGISTER + 1); addr = gen_rtx_fmt_ee (PLUS, Pmode, reg1, NULL_RTX); - for (i = 1; i <= 1 << 20; i <<= 1) + for (i = start; i <= 1 << 20; i <<= 1) { XEXP (addr, 1) = gen_int_mode (i, Pmode); if (!memory_address_p (mem_mode, addr)) break; } - max_offset[mem_mode] = i >> 1; + max_offset[mem_mode] = i == start ? 0 : i >> 1; off[mem_mode] = max_offset[mem_mode]; - for (i = 1; i <= 1 << 20; i <<= 1) + for (i = start; i <= 1 << 20; i <<= 1) { XEXP (addr, 1) = gen_int_mode (-i, Pmode); if (!memory_address_p (mem_mode, addr)) break; } - min_offset[mem_mode] = -(i >> 1); + min_offset[mem_mode] = i == start ? 0 : -(i >> 1); if (dump_file && (dump_flags & TDF_DETAILS)) { |