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* [Bug sim/11965] New: vmhaddshs, vmhraddshs uninitialized variable may cause wrong VSCR result
@ 2010-09-01 6:33 hp at sourceware dot org
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From: hp at sourceware dot org @ 2010-09-01 6:33 UTC (permalink / raw)
To: gdb-prs
Looking at sim/ppc/altivec.igen 1.4 it seems the sat variable for vmhaddshs and
vmhraddshs isn't initialized before being "|=" in the vector element loop, so
depending on what the host and compiler makes of it, VSCR (from calling
ALTIVEC_SET_SAT) may be set incorrectly. I guess not many codes looks at it,
hence going undetected until now. Just a random observation, no test-case or
anything. Not even sure I see right. :)
--
Summary: vmhaddshs, vmhraddshs uninitialized variable may cause
wrong VSCR result
Product: gdb
Version: HEAD
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: sim
AssignedTo: unassigned at sourceware dot org
ReportedBy: hp at sourceware dot org
CC: gdb-prs at sourceware dot org
GCC target triplet: powerpc-*
http://sourceware.org/bugzilla/show_bug.cgi?id=11965
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2010-09-01 6:33 [Bug sim/11965] New: vmhaddshs, vmhraddshs uninitialized variable may cause wrong VSCR result hp at sourceware dot org
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