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re PR rtl-optimization/3783 (gcc3.0/ia64 ICE on linux kernel file fs/ufs/super.c)

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Fix for PR 3783.
	* alias.c (clear_reg_alias_info): New.
	* flow.c (attempt_auto_inc): Call clear_reg_alias_info.
	* rtl.h (clear_reg_alias_info): Declare.

From-SVN: r45482
This commit is contained in:
Jim Wilson 2001-09-07 23:25:01 +00:00 committed by Jim Wilson
parent 177b41ebf3
commit 43fe47ca78
4 changed files with 24 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2001-09-07 Jim Wilson <wilson@redhat.com>
* alias.c (clear_reg_alias_info): New.
* flow.c (attempt_auto_inc): Call clear_reg_alias_info.
* rtl.h (clear_reg_alias_info): Declare.
2001-09-07 Roman Lechtchinsky <rl@cs.tu-berlin.de>
* real.c (EMUSHORT,EMUSHORT_SIZE): Use HImode if no 16-bit type is

14
gcc/alias.c
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@ -960,6 +960,20 @@ record_base_value (regno, val, invariant)
reg_base_value[regno] = find_base_value (val);
}
/* Clear alias info for a register. This is used if an RTL transformation
changes the value of a register. This is used in flow by AUTO_INC_DEC
optimizations. We don't need to clear reg_base_value, since flow only
changes the offset. */
void
clear_reg_alias_info (rtx reg)
{
int regno = REGNO (reg);
if (regno < reg_known_value_size)
reg_known_value[regno] = reg;
}
/* Returns a canonical version of X, from the point of view alias
analysis. (For example, if X is a MEM whose address is a register,
and the register has a known value (say a SYMBOL_REF), then a MEM

3
gcc/flow.c
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@ -7027,6 +7027,9 @@ attempt_auto_inc (pbi, inc, insn, mem, incr, incr_reg)
for (temp = insn; temp != incr; temp = NEXT_INSN (temp))
if (GET_CODE (temp) == CALL_INSN)
REG_N_CALLS_CROSSED (regno)++;
/* Invalidate alias info for Q since we just changed its value. */
clear_reg_alias_info (q);
}
else
return;

1
gcc/rtl.h
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@ -1988,6 +1988,7 @@ extern void fancy_abort PARAMS ((const char *, int, const char *))
#define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
/* In alias.c */
extern void clear_reg_alias_info PARAMS ((rtx));
extern rtx canon_rtx PARAMS ((rtx));
extern int true_dependence PARAMS ((rtx, enum machine_mode, rtx,
int (*)(rtx, int)));