[Bug libc/10107] 32-bit PowerPC POWER6 memcpy uses erroneous cmpldi but should use cmplwi

[Bug libc/10107] 32-bit PowerPC POWER6 memcpy uses erroneous cmpldi but should use cmplwi

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=10107

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
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              Flags|                            |security-

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[Bug libc/10107] 32-bit PowerPC POWER6 memcpy uses erroneous cmpldi but should use cmplwi

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2009-06-16 15:30 -------
Patch applied to git.

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           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://sourceware.org/bugzilla/show_bug.cgi?id=10107

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[Bug libc/10107] 32-bit PowerPC POWER6 memcpy uses erroneous cmpldi but should use cmplwi

[rsa at us dot ibm dot com]

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           What    |Removed                     |Added
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         AssignedTo|rsa at us dot ibm dot com   |drepper at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10107

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[Bug libc/10107] 32-bit PowerPC POWER6 memcpy uses erroneous cmpldi but should use cmplwi

[rsa at us dot ibm dot com]

------- Additional Comments From rsa at us dot ibm dot com  2009-04-30 15:38 -------
I attempted to produce a standalone testcase that would pass the high-word bits
of r5 as non-zero to the power6 memcpy but I was unable to get the compiler to
cooperate and reproduce the failure that I originally debugged.

Regardless, using cmpldi in 32-bit code is erroneous and in this case can cause
an overwrite of an array if r5 (length) parameter has bits set in the high-word
of the register.

Please check-in.

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           What    |Removed                     |Added
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   Target Milestone|---                         |2.10


http://sourceware.org/bugzilla/show_bug.cgi?id=10107

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[Bug libc/10107] 32-bit PowerPC POWER6 memcpy uses erroneous cmpldi but should use cmplwi

[rsa at us dot ibm dot com]

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           What    |Removed                     |Added
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             Status|NEW                         |ASSIGNED
   Last reconfirmed|0000-00-00 00:00:00         |2009-04-27 17:09:38
               date|                            |


http://sourceware.org/bugzilla/show_bug.cgi?id=10107

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[Bug libc/10107] 32-bit PowerPC POWER6 memcpy uses erroneous cmpldi but should use cmplwi

[rsa at us dot ibm dot com]

------- Additional Comments From rsa at us dot ibm dot com  2009-04-27 17:08 -------
Created an attachment (id=3911)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=3911&action=view)
cmpldi-to-cmplwi.diff

This is a fix to correct usage of cmpldi to cmplwi in the 32-bit POWER6
mem[cpy|set].  I'll attach a testcase shortly.

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