diff options
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/caller-save.c | 9 |
2 files changed, 13 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 1a5e9c61fa5..44199272ad5 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2000-08-09 Alexandre Oliva <aoliva@redhat.com> + + * caller-save.c (mark_referenced_regs): Mark partially-overwritten + multi-word registers. + 2000-08-08 Joseph S. Myers <jsm28@cam.ac.uk> * c-common.c (combine_strings, check_format_info): Refer to ISO C diff --git a/gcc/caller-save.c b/gcc/caller-save.c index f939de77858..8a411e17c78 100644 --- a/gcc/caller-save.c +++ b/gcc/caller-save.c @@ -512,7 +512,14 @@ mark_referenced_regs (x) x = SET_DEST (x); code = GET_CODE (x); if (code == REG || code == PC || code == CC0 - || (code == SUBREG && GET_CODE (SUBREG_REG (x)) == REG)) + || (code == SUBREG && GET_CODE (SUBREG_REG (x)) == REG + /* If we're setting only part of a multi-word register, + we shall mark it as referenced, because the words + that are not being set should be restored. */ + && ((GET_MODE_SIZE (GET_MODE (x)) + >= GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) + || (GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) + <= UNITS_PER_WORD)))) return; } if (code == MEM || code == SUBREG) |