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re PR middle-end/4520 (cselib.c hash_rtx incorrectly hashes based on rtx address)

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PR middle-end/4520
	PR bootstrap/28784
	* cselib.c (cselib_hash_rtx): Avoid hashing on the address of labels
	and symbols.  Instead use the implementation from cse.c's hash_rtx.

From-SVN: r116891
This commit is contained in:
Roger Sayle 2006-09-12 16:02:31 +00:00 committed by Roger Sayle
parent 4b943588d1
commit 4c6669c2c6
2 changed files with 26 additions and 5 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2006-09-12 Roger Sayle <roger@eyesopen.com>
PR middle-end/4520
PR bootstrap/28784
* cselib.c (cselib_hash_rtx): Avoid hashing on the address of labels
and symbols. Instead use the implementation from cse.c's hash_rtx.
2006-09-12 Jan Hubicka <jh@suse.cz>
PR rtl-optimization/28071

24
gcc/cselib.c
View File

@ -630,14 +630,28 @@ cselib_hash_rtx (rtx x, int create)
/* Assume there is only one rtx object for any given label. */
case LABEL_REF:
hash
+= ((unsigned) LABEL_REF << 7) + (unsigned long) XEXP (x, 0);
/* We don't hash on the address of the CODE_LABEL to avoid bootstrap
differences and differences between each stage's debugging dumps. */
hash += (((unsigned int) LABEL_REF << 7)
+ CODE_LABEL_NUMBER (XEXP (x, 0)));
return hash ? hash : (unsigned int) LABEL_REF;
case SYMBOL_REF:
hash
+= ((unsigned) SYMBOL_REF << 7) + (unsigned long) XSTR (x, 0);
return hash ? hash : (unsigned int) SYMBOL_REF;
{
/* Don't hash on the symbol's address to avoid bootstrap differences.
Different hash values may cause expressions to be recorded in
different orders and thus different registers to be used in the
final assembler. This also avoids differences in the dump files
between various stages. */
unsigned int h = 0;
const unsigned char *p = (const unsigned char *) XSTR (x, 0);
while (*p)
h += (h << 7) + *p++; /* ??? revisit */
hash += ((unsigned int) SYMBOL_REF << 7) + h;
return hash ? hash : (unsigned int) SYMBOL_REF;
}
case PRE_DEC:
case PRE_INC: