http://llvm.org/bugs/show_bug.cgi?id=18316
Bug ID: 18316
Summary: [powerpc-darwin][AsmPrinter] addis instruction expects
0 instead of r0
Product: libraries
Version: trunk
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: Backend: PowerPC
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Classification: Unclassified
During my stage-2 build of powerpc-darwin8 clang, stage-1 clang was found to
emit some assembly that was rejected by the system assembler (including the
'as' from odcctools-2009).
% cat addis.s
addis r30, 0, 1 ; OK
addis r30, r1, 1 ; OK
addis r30, r0, 1 : rejected
% as addis.s -o addis.o
addis.s:3:Parameter error: r0 not allowed for parameter 2 (code as 0 not r0)
Apparently, r0 is special enough to warrant different syntax in certain
contexts.
Would it be possible to emit such instructions differently?
The PPC darwin asm parser, accepts all of the above:
% ~/local/src/LLVM-svn/gcc40-cmake-build/bin/llvm-mc -triple
powerpc-apple-darwin8 addis.s -filetype=obj -o addis.o
I don't mind keeping that as-is, but if you want tighter conformity, you could
mimic the darwin assembler behavior.
I think it's more important to emit darwin-asm-friendly code so that
-no-integrated-as continues to work.
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