http://llvm.org/bugs/show_bug.cgi?id=11291
Bug #: 11291
Summary: LLVM 3.0rc2: popcnt instruction fails on OSX (invalid
suffix)
Product: new-bugs
Version: 2.9
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 7570
--> http://llvm.org/bugs/attachment.cgi?id=7570
testcase
I've attached a small test case that produces assembly code that the assemblers
on OSX can't handle. OSX doesn't handle the length suffixes on the popcnt
instruction (e.g. {w,l,q}).
Here is a related GCC bug for this issue:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34497#c14
I believe they fixed it by not adding the suffix on OSX, which works fine.
Indeed changing instruction definition in lib/Target/X86/X86InstrSSE.td to drop
the suffix, works fine.
The integrated assembler of llc works fine but GHC which uses LLVM can't use
the integrated assembler at this stage as we do some assembly post processing.
== To Reproduce ==
1. llc testcase.ll -o testcase.s
2. gcc -m32 -c testcase.s -o b.o
(or as -arch i386 testcase.s)
== Expected Output ==
Shiny object file
== Actual Output ==
testcase.s:7:suffix or operands invalid for `popcnt'
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