OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

* reg-stack.c (convert_regs_1): Handle EH edges specially. 

From-SVN: r30336
This commit is contained in:
Richard Henderson 1999-11-01 18:09:55 -08:00 committed by Richard Henderson
parent e40217a763
commit f6d204868a
2 changed files with 31 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
gcc/ChangeLog
View File

@ -1,3 +1,7 @@
Mon Nov 1 18:09:14 1999 Richard Henderson <rth@cygnus.com>
* reg-stack.c (convert_regs_1): Handle EH edges specially.
Mon Nov 1 15:41:01 1999 Mark P. Mitchell <mark@codesourcery.com>
* bitmap.h (BITMAP_XMALLOC): New macro.

32
gcc/reg-stack.c
View File

@ -2514,12 +2514,34 @@ 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)
{
/* Assert that the lifetimes are as we expect -- one value
live at st(0) on the end of the source block, and no
values live at the beginning of the destination block. */
HARD_REG_SET tmp;
CLEAR_HARD_REG_SET (tmp);
GO_IF_HARD_REG_EQUAL (BLOCK_INFO (e->dest)->stack_in.reg_set,
tmp, eh1);
abort();
eh1:
SET_HARD_REG_BIT (tmp, FIRST_STACK_REG);
GO_IF_HARD_REG_EQUAL (BLOCK_INFO (e->src)->out_reg_set, tmp, eh2);
abort();
eh2:;
}
/* It is better to output directly to the end of the block
instead of to the edge, because emit_swap can do minimal
insn scheduling. We can do this when there is only one
edge out, and it is not abnormal. */
if (block->succ->succ_next == NULL
&& ! (e->flags & EDGE_ABNORMAL))
else if (block->succ->succ_next == NULL
&& ! (e->flags & EDGE_ABNORMAL))
{
/* change_stack kills values in regstack. */
tmpstack = regstack;
@ -2532,9 +2554,9 @@ convert_regs_1 (file, block)
{
rtx seq, after;
/* We don't support abnormal edges. Global takes
care to avoid any live register across them, so
we should never have to. */
/* We don't support abnormal edges. Global takes care to
avoid any live register across them, so we should never
have to insert instructions on such edges. */
if (e->flags & EDGE_ABNORMAL)
abort ();