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| author | Richard Kenner <kenner@gcc.gnu.org> | 1994-03-21 17:15:32 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1994-03-21 17:15:32 -0500 |
| commit | e3a771613feb915111421ff10f29937aee88c452 (patch) | |
| tree | 9db21cf638d2bc7718fc44129058eb0f8d47b459 /gcc | |
| parent | 987c71d9bcf5f1211dfde6e515d8a35675ca5983 (diff) | |
| download | gcc-e3a771613feb915111421ff10f29937aee88c452.zip gcc-e3a771613feb915111421ff10f29937aee88c452.tar.gz gcc-e3a771613feb915111421ff10f29937aee88c452.tar.bz2 | |
(preserve_temp_slots): If argument is REG, see if it is address of a
temp slot we know about.
From-SVN: r6843
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/function.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gcc/function.c b/gcc/function.c index a266ead..8726afb 100644 --- a/gcc/function.c +++ b/gcc/function.c @@ -946,9 +946,23 @@ preserve_temp_slots (x) { struct temp_slot *p; + if (x == 0) + return; + + /* If X is a register that is being used as a pointer, see if we have + a temporary slot we know it points to. To be consistent with + the code below, we really should preserve all non-kept slots + if we can't find a match, but that seems to be much too costly. */ + if (GET_CODE (x) == REG && REGNO_POINTER_FLAG (REGNO (x)) + && (p = find_temp_slot_from_address (x)) != 0) + { + p->level--; + return; + } + /* If X is not in memory or is at a constant address, it cannot be in a temporary slot. */ - if (x == 0 || GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))) + if (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))) return; /* First see if we can find a match. */ |