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re PR rtl-optimization/48542 (unchanged variables in code which calls setjmp may be clobbered (including the return-address)) 

PR rtl-optimization/48542
	* reload.c (find_equiv_reg): Stop looking when finding a
	setjmp-type call.
	* reload1.c (reload_as_needed): Invalidate all reload
	registers when crossing a setjmp-type call.

From-SVN: r175144
This commit is contained in:
Hans-Peter Nilsson 2011-06-17 11:20:01 +00:00 committed by Hans-Peter Nilsson
parent a079fb105a
commit 45898b407d
3 changed files with 27 additions and 0 deletions
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11
gcc/ChangeLog
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@ -1,3 +1,14 @@
2011-06-17 Hans-Peter Nilsson <hp@axis.com>
Backport from mainline
2011-06-17 Hans-Peter Nilsson <hp@axis.com>
PR rtl-optimization/48542
* reload.c (find_equiv_reg): Stop looking when finding a
setjmp-type call.
* reload1.c (reload_as_needed): Invalidate all reload
registers when crossing a setjmp-type call.
2011-06-09 Eric Botcazou <ebotcazou@adacore.com>
* config/sparc/sparc.md (return_internal): Adjust 'length' attribute.

9
gcc/reload.c
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@ -6731,6 +6731,15 @@ find_equiv_reg (rtx goal, rtx insn, enum reg_class rclass, int other,
|| num > PARAM_VALUE (PARAM_MAX_RELOAD_SEARCH_INSNS))
return 0;
/* Don't reuse register contents from before a setjmp-type
function call; on the second return (from the longjmp) it
might have been clobbered by a later reuse. It doesn't
seem worthwhile to actually go and see if it is actually
reused even if that information would be readily available;
just don't reuse it across the setjmp call. */
if (CALL_P (p) && find_reg_note (p, REG_SETJMP, NULL_RTX))
return 0;
if (NONJUMP_INSN_P (p)
/* If we don't want spill regs ... */
&& (! (reload_reg_p != 0

7
gcc/reload1.c
View File

@ -4428,6 +4428,13 @@ reload_as_needed (int live_known)
{
AND_COMPL_HARD_REG_SET (reg_reloaded_valid, call_used_reg_set);
AND_COMPL_HARD_REG_SET (reg_reloaded_valid, reg_reloaded_call_part_clobbered);
/* If this is a call to a setjmp-type function, we must not
reuse any reload reg contents across the call; that will
just be clobbered by other uses of the register in later
code, before the longjmp. */
if (find_reg_note (insn, REG_SETJMP, NULL_RTX))
CLEAR_HARD_REG_SET (reg_reloaded_valid);
}
}