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re PR rtl-optimization/6233 (simple loop miscompilation)

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PR optimization/6233
	* rtlanal.c (pure_call_p): New function.
	* rtl.h (pure_call_p): Declare.
	* loop.c (prescan_loop): Use it to set has_nonconst_call.
	* gcse.c (store_killed_in_insn): Use pure_call_p here too.

From-SVN: r52110
This commit is contained in:
Alan Modra 2002-04-10 03:50:39 +00:00 committed by Alan Modra
parent 7b2e107761
commit a6a063b81c
5 changed files with 37 additions and 15 deletions

8
gcc/ChangeLog

@ -1,3 +1,11 @@
2002-04-10 Alan Modra <amodra@bigpond.net.au>
PR optimization/6233
* rtlanal.c (pure_call_p): New function.
* rtl.h (pure_call_p): Declare.
* loop.c (prescan_loop): Use it to set has_nonconst_call.
* gcse.c (store_killed_in_insn): Use pure_call_p here too.
2002-04-09 Eric Christopher <echristo@redhat.com>
* config/mips/mips.h (ASM_OUTPUT_ALIGNED_DECL_COMMON): Add additional

16
gcc/gcse.c

@ -6528,21 +6528,7 @@ store_killed_in_insn (x, insn)
{
/* A normal or pure call might read from pattern,
but a const call will not. */
if (CONST_OR_PURE_CALL_P (insn))
{
rtx link;
for (link = CALL_INSN_FUNCTION_USAGE (insn);
link;
link = XEXP (link, 1))
if (GET_CODE (XEXP (link, 0)) == USE
&& GET_CODE (XEXP (XEXP (link, 0), 0)) == MEM
&& GET_CODE (XEXP (XEXP (XEXP (link, 0), 0), 0)) == SCRATCH)
return 1;
return 0;
}
else
return 1;
return ! CONST_OR_PURE_CALL_P (insn) || pure_call_p (insn);
}
if (GET_CODE (PATTERN (insn)) == SET)

2
gcc/loop.c

@ -2494,6 +2494,8 @@ prescan_loop (loop)
loop_info->unknown_address_altered = 1;
loop_info->has_nonconst_call = 1;
}
else if (pure_call_p (insn))
loop_info->has_nonconst_call = 1;
loop_info->has_call = 1;
if (can_throw_internal (insn))
loop_info->has_multiple_exit_targets = 1;

1
gcc/rtl.h

@ -1502,6 +1502,7 @@ extern rtx find_reg_equal_equiv_note PARAMS ((rtx));
extern int find_reg_fusage PARAMS ((rtx, enum rtx_code, rtx));
extern int find_regno_fusage PARAMS ((rtx, enum rtx_code,
unsigned int));
extern int pure_call_p PARAMS ((rtx));
extern void remove_note PARAMS ((rtx, rtx));
extern int side_effects_p PARAMS ((rtx));
extern int volatile_refs_p PARAMS ((rtx));

25
gcc/rtlanal.c

@ -2011,6 +2011,31 @@ find_regno_fusage (insn, code, regno)
return 0;
}
/* Return true if INSN is a call to a pure function. */
int
pure_call_p (insn)
rtx insn;
{
rtx link;
if (GET_CODE (insn) != CALL_INSN || ! CONST_OR_PURE_CALL_P (insn))
return 0;
/* Look for the note that differentiates const and pure functions. */
for (link = CALL_INSN_FUNCTION_USAGE (insn); link; link = XEXP (link, 1))
{
rtx u, m;
if (GET_CODE (u = XEXP (link, 0)) == USE
&& GET_CODE (m = XEXP (u, 0)) == MEM && GET_MODE (m) == BLKmode
&& GET_CODE (XEXP (m, 0)) == SCRATCH)
return 1;
}
return 0;
}
/* Remove register note NOTE from the REG_NOTES of INSN. */