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cfgexpand (n_stack_vars_conflict): New static variable. 

* cfgexpand (n_stack_vars_conflict): New static variable.
	(triangular_index): Reduce likelyhood of overflow by performing
	the division before the multiplication.
	(resize_stack_vars_conflict): Call fatal_error if overflow
	occurred in triangular_index.  Update n_stack_vars_conflict.

From-SVN: r154689
This commit is contained in:
Bernd Schmidt 2009-11-26 21:46:45 +00:00 committed by Bernd Schmidt
parent a96caf8085
commit 15b83b0f47
2 changed files with 18 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,5 +1,11 @@
2009-11-26 Bernd Schmidt <bernd.schmidt@analog.com>
* cfgexpand (n_stack_vars_conflict): New static variable.
(triangular_index): Reduce likelyhood of overflow by performing
the division before the multiplication.
(resize_stack_vars_conflict): Call fatal_error if overflow
occurred in triangular_index. Update n_stack_vars_conflict.
PR rtl-opt/38582
* regrename.c (struct du_chain): Remove member earlyclobber.
(scan_rtx_reg): Don't set it. Remove argument earlyclobber,

14
gcc/cfgexpand.c
View File

@ -217,6 +217,7 @@ static size_t *stack_vars_sorted;
is lower triangular. */
static bool *stack_vars_conflict;
static size_t stack_vars_conflict_alloc;
static size_t n_stack_vars_conflict;
/* The phase of the stack frame. This is the known misalignment of
virtual_stack_vars_rtx from PREFERRED_STACK_BOUNDARY. That is,
@ -335,7 +336,11 @@ triangular_index (size_t i, size_t j)
size_t t;
t = i, i = j, j = t;
}
return (i * (i + 1)) / 2 + j;
if (i & 1)
return ((i + 1) / 2) * i + j;
else
return (i / 2) * (i + 1) + j;
}
/* Ensure that STACK_VARS_CONFLICT is large enough for N objects. */
@ -346,12 +351,17 @@ resize_stack_vars_conflict (size_t n)
size_t size = triangular_index (n-1, n-1) + 1;
if (size <= stack_vars_conflict_alloc)
return;
{
if (n > n_stack_vars_conflict)
fatal_error ("program is too large to be compiled on this machine");
return;
}
stack_vars_conflict = XRESIZEVEC (bool, stack_vars_conflict, size);
memset (stack_vars_conflict + stack_vars_conflict_alloc, 0,
(size - stack_vars_conflict_alloc) * sizeof (bool));
stack_vars_conflict_alloc = size;
n_stack_vars_conflict = n;
}
/* Make the decls associated with luid's X and Y conflict. */