diff options
| author | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-03-28 06:22:23 +0000 |
|---|---|---|
| committer | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-03-28 06:22:23 +0000 |
| commit | 022208375a3750f0b792adcfa8176d7e85e5ef6d (patch) | |
| tree | 6a3f4acb3012550610fc130ba3daec51f92064a8 /gcc/reg-stack.c | |
| parent | 98ad18c5b45f0e24a22a159bbb925a96a4064fe3 (diff) | |
| download | gcc-022208375a3750f0b792adcfa8176d7e85e5ef6d.tar.gz | |
* flow.c (tidy_fallthru_edges): Don't combine complex edges.
(calculate_global_regs_live): Kill call-clobbered registers
across exception edges.
* reg-stack.c (convert_regs_1): Kill the entire target stack
across non-call exception edges.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@40909 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/reg-stack.c')
| -rw-r--r-- | gcc/reg-stack.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/gcc/reg-stack.c b/gcc/reg-stack.c index 0e85a5ab922..54c3f086a48 100644 --- a/gcc/reg-stack.c +++ b/gcc/reg-stack.c @@ -2553,10 +2553,15 @@ convert_regs_1 (file, block) } } - /* Care for EH edges specially. The normal return path may return - a value in st(0), but the EH path will not, and there's no need - to add popping code to the edge. */ - if (e->flags & (EDGE_EH | EDGE_ABNORMAL_CALL)) + /* Care for non-call EH edges specially. The normal return path have + values in registers. These will be popped en masse by the unwind + library. */ + if ((e->flags & (EDGE_EH | EDGE_ABNORMAL_CALL)) == EDGE_EH) + target_stack->top = -1; + + /* Other calls may appear to have values live in st(0), but the + abnormal return path will not have actually loaded the values. */ + else if (e->flags & EDGE_ABNORMAL_CALL) { /* Assert that the lifetimes are as we expect -- one value live at st(0) on the end of the source block, and no |