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[Bug libc/10107] 32-bit PowerPC POWER6 memcpy uses erroneous cmpldi but should use cmplwi
- From: "rsa at us dot ibm dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 30 Apr 2009 15:38:22 -0000
- Subject: [Bug libc/10107] 32-bit PowerPC POWER6 memcpy uses erroneous cmpldi but should use cmplwi
- References: <20090427170435.10107.rsa@us.ibm.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- 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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