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| author | Jason Merrill <merrill@gnu.org> | 1997-07-28 17:42:09 +0000 |
|---|---|---|
| committer | Jason Merrill <merrill@gnu.org> | 1997-07-28 17:42:09 +0000 |
| commit | 429baef53a9d160e88ce202a09c8d735524893b4 (patch) | |
| tree | 4ad98076fbd37dc982a542309fc2b8a53b0240ba /gcc | |
| parent | f0eebf28c40eb05fade71ddf798b25ef8754099a (diff) | |
| download | gcc-429baef53a9d160e88ce202a09c8d735524893b4.zip gcc-429baef53a9d160e88ce202a09c8d735524893b4.tar.gz gcc-429baef53a9d160e88ce202a09c8d735524893b4.tar.bz2 | |
x
From-SVN: r14542
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/stor-layout.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/gcc/stor-layout.c b/gcc/stor-layout.c index 83bfb99..7c4b4f6 100644 --- a/gcc/stor-layout.c +++ b/gcc/stor-layout.c @@ -835,6 +835,8 @@ layout_type (type) if (TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST) { tree field; + enum machine_mode mode = VOIDmode; + /* A record which has any BLKmode members must itself be BLKmode; it can't go in a register. Unless the member is BLKmode only because it isn't aligned. */ @@ -860,13 +862,23 @@ layout_type (type) != ((TREE_INT_CST_LOW (DECL_SIZE (field)) + bitpos - 1) / BITS_PER_WORD) /* But there is no problem if the field is entire words. */ - && TREE_INT_CST_LOW (DECL_SIZE (field)) % BITS_PER_WORD == 0) + && TREE_INT_CST_LOW (DECL_SIZE (field)) % BITS_PER_WORD != 0) goto record_lose; + + /* If this field is the whole struct, remember its mode so + that, say, we can put a double in a class into a DF + register instead of forcing it to live in the stack. */ + if (simple_cst_equal (TYPE_SIZE (type), DECL_SIZE (field))) + mode = DECL_MODE (field); } - TYPE_MODE (type) - = mode_for_size (TREE_INT_CST_LOW (TYPE_SIZE (type)), - MODE_INT, 1); + if (mode != VOIDmode) + /* We only have one real field; use its mode. */ + TYPE_MODE (type) = mode; + else + TYPE_MODE (type) + = mode_for_size (TREE_INT_CST_LOW (TYPE_SIZE (type)), + MODE_INT, 1); /* If structure's known alignment is less than what the scalar mode would need, and it matters, |