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except.c (init_eh): Fix computation of builtin setjmp buffer size to allow for targets where...

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* except.c (init_eh): Fix computation of builtin setjmp buffer
	size to allow for targets where POINTER_SIZE > BITS_PER_WORD.

From-SVN: r210612
This commit is contained in:
Nick Clifton 2014-05-19 13:27:25 +00:00 • committed by Nick Clifton
parent cb460086e1
commit 40ba8dfb39
2 changed files with 20 additions and 2 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-05-19 Nick Clifton <nickc@redhat.com>
* except.c (init_eh): Fix computation of builtin setjmp buffer
size to allow for targets where POINTER_SIZE > BITS_PER_WORD.
2014-05-19 Richard Biener <rguenther@suse.de>
PR tree-optimization/61184

17
gcc/except.c
View file

@ -286,9 +286,22 @@ init_eh (void)
tmp = size_int (FIRST_PSEUDO_REGISTER + 2 - 1);
#endif
#else
/* builtin_setjmp takes a pointer to 5 words. */
tmp = size_int (5 * BITS_PER_WORD / POINTER_SIZE - 1);
/* Compute a minimally sized jump buffer. We need room to store at
least 3 pointers - stack pointer, frame pointer and return address.
Plus for some targets we need room for an extra pointer - in the
case of MIPS this is the global pointer. This makes a total of four
pointers, but to be safe we actually allocate room for 5.
If pointers are smaller than words then we allocate enough room for
5 words, just in case the backend needs this much room. For more
discussion on this issue see:
http://gcc.gnu.org/ml/gcc-patches/2014-05/msg00313.html. */
if (POINTER_SIZE > BITS_PER_WORD)
tmp = size_int (5 - 1);
else
tmp = size_int ((5 * BITS_PER_WORD / POINTER_SIZE) - 1);
#endif
tmp = build_index_type (tmp);
tmp = build_array_type (ptr_type_node, tmp);
f_jbuf = build_decl (BUILTINS_LOCATION,