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List: llvm-bugs
Subject: [LLVMbugs] [Bug 1530] NEW: missing implied subtarget features
From: bugzilla-daemon () cs ! uiuc ! edu
Date: 2007-06-27 22:19:10
Message-ID: 200706272219.l5RMJAbi032242 () zion ! cs ! uiuc ! edu
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http://llvm.org/bugs/show_bug.cgi?id=1530
Summary: missing implied subtarget features
Product: libraries
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Target Description Classes
AssignedTo: unassignedbugs@nondot.org
ReportedBy: djg@cray.com
llc -march=x86-64 -mcpu=opteron
gives this message:
Warning: 64-bit processors all have at least SSE2.
Looking at the code in lib/Target/SubtargetFeature.cpp,
SetImpliedBits isn't called for the base CPU's feature
bits, so even though "opteron" has the 64-bit feature
and 64-bit implies SSE2, -mcpu=opteron doesn't
automatically enable SSE2.
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