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| author |   miod <miod@openbsd.org> | 2004-05-04 16:14:32 +0000 |
|---|---|---|
| committer | miod <miod@openbsd.org> | 2004-05-04 16:14:32 +0000 |
| commit | 3ec3567666e66e793ab0d2ddf9eade3aa5392628 (patch) | |
| tree | 967e6c80e12e3d6cd3ab8137a8a4ecb969d7d1f8 | |
| parent | In _longjmp(), flush windows rather than attempting to backtrack manually, (diff) | |
| download | wireguard-openbsd-3ec3567666e66e793ab0d2ddf9eade3aa5392628.tar.xz wireguard-openbsd-3ec3567666e66e793ab0d2ddf9eade3aa5392628.zip | |
Backport a fix from gcc 3 (revision 1.32):
* caller-save.c (mark_referenced_regs): Mark partially-overwritten
multi-word registers.
This problem apparently only affected m88k, as far as OpenBSD is concerned.
| -rw-r--r-- | gnu/egcs/gcc/caller-save.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gnu/egcs/gcc/caller-save.c b/gnu/egcs/gcc/caller-save.c index 7c390a5955e..4f18a231e88 100644 --- a/gnu/egcs/gcc/caller-save.c +++ b/gnu/egcs/gcc/caller-save.c @@ -504,7 +504,14 @@ 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) |