https://bugs.kde.org/show_bug.cgi?id=385843
Bug ID: 385843
Summary: [PATCH] ARM: mark caller-save VFP registes as trashed
by calls
Product: valgrind
Version: 3.14 SVN
Platform: unspecified
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: vex
Assignee: jsew...@acm.org
Reporter: saa...@cisco.com
Target Milestone: ---
Created attachment 108391
--> https://bugs.kde.org/attachment.cgi?id=108391&action=edit
ARMv7 NEON test program
The attached test program gives the wrong output when run with the memcheck
tool. The attached patch makes the issue disappear. The issue depends on how
valgrind is built.
With the right combination of compiler and compiler flags (e.g. using
-mfpu=neon makes a difference here with GCC 7.2.0), the helper functions in
memcheck/mc_main.c end up using the same (caller-save) VFP registers as used by
VEX.
According to
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042f/IHI0042F_aapcs.pdf
(§5.1.2.1 VFP register usage conventions): VFP registers d16-d31 (q8-q15), if
present, do not need to preserved (by the callee).
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