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hashtab.c (hash_pointer): Remove conditional and avoid unexecuted shift equal to wordsize.

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2013-05-06  David Edelsohn  <dje.gcc@gmail.com>
            Peter Bergner  <bergner@vnet.ibm.com>
            Segher Boessenkool  <segher@kernel.crashing.org>
            Jakub Jelinek  <jakub@redhat.com>

        * hashtab.c (hash_pointer): Remove conditional and avoid
        unexecuted shift equal to wordsize.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>
Co-Authored-By: Peter Bergner <bergner@vnet.ibm.com>
Co-Authored-By: Segher Boessenkool <segher@kernel.crashing.org>

From-SVN: r198633
This commit is contained in:
David Edelsohn 2013-05-06 15:40:54 +00:00 committed by David Edelsohn
parent cb3f6a88f6
commit b768e8cf27
2 changed files with 10 additions and 11 deletions
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8
libiberty/ChangeLog
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@ -1,3 +1,11 @@
2013-05-06 David Edelsohn <dje.gcc@gmail.com>
Peter Bergner <bergner@vnet.ibm.com>
Segher Boessenkool <segher@kernel.crashing.org>
Jakub Jelinek <jakub@redhat.com>
* hashtab.c (hash_pointer): Remove conditional and avoid
unexecuted shift equal to wordsize.
2013-04-22 Andi Kleen <ak@linux.intel.com>
* hashtab.c (hash_pointer): Move to end of file and reimplement.

13
libiberty/hashtab.c
View File

@ -990,17 +990,8 @@ hash_pointer (const PTR p)
unsigned a, b, c;
a = b = 0x9e3779b9;
if (sizeof (intptr_t) == 4)
{
/* Mix as 16bit for now */
a += v >> 16;
b += v & 0xffff;
}
else
{
a += v >> 32;
b += v & 0xffffffff;
}
a += v >> (sizeof (intptr_t) * CHAR_BIT / 2);
b += v & (((intptr_t) 1 << (sizeof (intptr_t) * CHAR_BIT / 2)) - 1);
c = 0x42135234;
mix (a, b, c);
return c;