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| author | Eric Botcazou <ebotcazou@adacore.com> | 2012-10-15 10:48:17 +0000 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2012-10-15 10:48:17 +0000 |
| commit | 9506aecb3b05c1a9f1f04760fc5320acbfc283b1 (patch) | |
| tree | cf71a31c094d976a5684e5387e5079bfd0807bb6 /gcc/expr.c | |
| parent | 0127aae46a182abeadf7419088ad85c9ba5bffc8 (diff) | |
| download | gcc-9506aecb3b05c1a9f1f04760fc5320acbfc283b1.tar.gz | |
expr.c (expand_expr_real_1): Do not unnecessarily copy the object in the MEM_P case.
* expr.c (expand_expr_real_1) <VIEW_CONVERT_EXPR>: Do not unnecessarily
copy the object in the MEM_P case.
From-SVN: r192452
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/expr.c b/gcc/expr.c index 1adea93c316..7cf812d3e3a 100644 --- a/gcc/expr.c +++ b/gcc/expr.c @@ -10270,10 +10270,15 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode, { enum insn_code icode; - op0 = copy_rtx (op0); - if (TYPE_ALIGN_OK (type)) - set_mem_align (op0, MAX (MEM_ALIGN (op0), TYPE_ALIGN (type))); + { + /* ??? Copying the MEM without substantially changing it might + run afoul of the code handling volatile memory references in + store_expr, which assumes that TARGET is returned unmodified + if it has been used. */ + op0 = copy_rtx (op0); + set_mem_align (op0, MAX (MEM_ALIGN (op0), TYPE_ALIGN (type))); + } else if (mode != BLKmode && MEM_ALIGN (op0) < GET_MODE_ALIGNMENT (mode) /* If the target does have special handling for unaligned |