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| author | Jeffrey A Law <law@cygnus.com> | 1998-07-13 09:26:59 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1998-07-13 03:26:59 -0600 |
| commit | b5f881570be51f9c67780802e7e8627a62c8a1de (patch) | |
| tree | a0cbab974a5039faeee315e4122850b6a7d4fa72 /gcc | |
| parent | bda991ee5e88baded69529b5c9271bba6c7399bc (diff) | |
| download | gcc-b5f881570be51f9c67780802e7e8627a62c8a1de.zip gcc-b5f881570be51f9c67780802e7e8627a62c8a1de.tar.gz gcc-b5f881570be51f9c67780802e7e8627a62c8a1de.tar.bz2 | |
expr.c (expand_expr): Only set MEM_IN_STRUCT_P if the memory address is not varying for...
* expr.c (expand_expr): Only set MEM_IN_STRUCT_P if the memory address
is not varying for REFERENCE_TYPE or when we think we might have found
an optimized access to the first element in an array.
From-SVN: r21099
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/expr.c | 35 |
2 files changed, 27 insertions, 14 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 2ea1526..20b221d 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +Mon Jul 13 10:19:00 1998 Jeffrey A Law (law@cygnus.com) + + * expr.c (expand_expr): Only set MEM_IN_STRUCT_P if the memory address + is not varying for REFERENCE_TYPE or when we think we might have found + an optimized access to the first element in an array. + Mon Jul 13 02:24:08 1998 David S. Miller <davem@pierdol.cobaltmicro.com> * regclass.c (reg_scan_mark_refs): New arg min_regno. Only update @@ -5836,23 +5836,30 @@ expand_expr (exp, target, tmode, modifier) || (TREE_CODE (exp1) == SAVE_EXPR && TREE_CODE (TREE_OPERAND (exp1, 0)) == PLUS_EXPR) || AGGREGATE_TYPE_P (TREE_TYPE (exp)) - /* If the pointer is actually a REFERENCE_TYPE, this could - be pointing into some aggregate too. */ - || TREE_CODE (TREE_TYPE (exp1)) == REFERENCE_TYPE || (TREE_CODE (exp1) == ADDR_EXPR && (exp2 = TREE_OPERAND (exp1, 0)) - && AGGREGATE_TYPE_P (TREE_TYPE (exp2))) - /* This may have been an array reference to the first element - that was optimized away from being an addition. */ - || (TREE_CODE (exp1) == NOP_EXPR - && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (exp1, 0))) - == REFERENCE_TYPE) - || ((TREE_CODE (TREE_TYPE (TREE_OPERAND (exp1, 0))) - == POINTER_TYPE) - && (AGGREGATE_TYPE_P - (TREE_TYPE (TREE_TYPE - (TREE_OPERAND (exp1, 0))))))))) + && AGGREGATE_TYPE_P (TREE_TYPE (exp2)))) MEM_IN_STRUCT_P (temp) = 1; + + /* If the pointer is actually a REFERENCE_TYPE, this could be pointing + into some aggregate too. In theory we could fold this into the + previous check and use rtx_addr_varies_p there too. + + However, this seems safer. */ + if (!MEM_IN_STRUCT_P (temp) + && (TREE_CODE (TREE_TYPE (exp1)) == REFERENCE_TYPE + /* This may have been an array reference to the first element + that was optimized away from being an addition. */ + || (TREE_CODE (exp1) == NOP_EXPR + && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (exp1, 0))) + == REFERENCE_TYPE) + || ((TREE_CODE (TREE_TYPE (TREE_OPERAND (exp1, 0))) + == POINTER_TYPE) + && (AGGREGATE_TYPE_P + (TREE_TYPE (TREE_TYPE + (TREE_OPERAND (exp1, 0)))))))))) + MEM_IN_STRUCT_P (temp) = ! rtx_addr_varies_p (temp); + MEM_VOLATILE_P (temp) = TREE_THIS_VOLATILE (exp) | flag_volatile; MEM_ALIAS_SET (temp) = get_alias_set (exp); |