[Llvm-bgq-discuss] clang ICE: std::atomic<uint_fast16_t>

[Hal Finkel]

Michael,

Thanks for the report. I'll get these fixed.

 -Hal

----- Original Message -----
> From: "Michael Blocksome" <blocksom at us.ibm.com>
> To: llvm-bgq-discuss at lists.alcf.anl.gov
> Sent: Tuesday, February 5, 2013 4:25:58 PM
> Subject: Re: [Llvm-bgq-discuss] clang ICE: std::atomic<uint_fast16_t>
> 
> 
> One other thing .. the 'store' method gives the same failure, but the
> 'exchange' method seems to work.
> 
> std::atomic<uint_fast16_t> b;
> b = 0; // fail
> b.store(0); // fail
> b.exchange(0); // success
> 
> Michael Blocksome
> Blue Gene Messaging
> blocksom at us.ibm.com
> 
> 
> 
> 
> From: Michael Blocksome/Rochester/IBM at IBMUS
> To: llvm-bgq-discuss at lists.alcf.anl.gov,
> Date: 02/05/2013 04:21 PM
> Subject: [Llvm-bgq-discuss] clang ICE: std::atomic<uint_fast16_t>
> Sent by: llvm-bgq-discuss-bounces at lists.alcf.anl.gov
> 
> 
> 
> 
> I recently learned that I should not be using types such as
> 'uint32_t' for atomics, but instead should use the "fast" versions
> of these types, such as 'uint_fast32_t'. However, when I use these
> "fast" types with clang and the std::atomic::operator= overload I
> get a nasty ICE.
> 
> I get the same ICE with 'uint64_t', so I'm guessing that
> 'uint_fast*_t' is a typedef to 'uint64_t'...
> 
> ----
> 
> $> cat atomic_store.cc
> 
> #include <atomic>
> 
> int main ()
> {
> // this works fine ...
> std::atomic<uint_fast16_t> a(0);
> a++;
> 
> std::atomic<uint_fast16_t> b;
> b = 0; // fail
> 
> std::atomic<uint16_t> c;
> c = 0; // success
> 
> std::atomic<uint32_t> d;
> d = 0; // success
> 
> std::atomic<uint64_t> e;
> e = 0; // fail
> 
> std::atomic<uint_fast32_t> f;
> f = 0; // fail
> 
> return 0;
> };
> 
> $> /bghome/blocksom/development/c++11/bgclang++ -ferror-limit=10 -I
> /bghome/blocksom/development/c++11/install/libc++/include -std=c++11
> -stdlib=libc++ -g -c atomic_store.cc -o atomic_store.o
> fatal error: error in backend: Cannot select: 0x10005b64a80: ch =
> AtomicStore 0x10005b67ac0, 0x10005b66ca0, 0x10005b679c0<Volatile
> ST8[%__a_.i.i62]> [ID=10]
> dbg:/bghome/blocksom/development/c++11/install/libc++/include/atomic:571
> 0x10005b66ca0: i64,ch = CopyFromReg 0x10005ac0660, 0x10005b60c30
> [ID=8]
> dbg:/bghome/blocksom/development/c++11/install/libc++/include/atomic:571
> 0x10005b60c30: i64 = Register %vreg1 [ID=5]
> 0x10005b679c0: i64,ch = load 0x10005ac0660, 0x10005b65390,
> 0x10005b61230<LD8[%.atomictmp.i.i57]> [ORD=98] [ID=7]
> dbg:/bghome/blocksom/development/c++11/install/libc++/include/atomic:571
> 0x10005b65390: i64 = FrameIndex<14> [ORD=98] [ID=1]
> 0x10005b61230: i64 = undef [ORD=98] [ID=2]
> In function: main
> clang: error: clang frontend command failed with exit code 70 (use -v
> to see invocation)
> clang version 3.3 (trunk 170456)
> Target: powerpc64-bgq-linux
> Thread model: posix
> clang: note: diagnostic msg: PLEASE submit a bug report to
> http://llvm.org/bugs/ and include the crash backtrace, preprocessed
> source, and associated run script.
> clang: note: diagnostic msg:
> ********************
> 
> PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
> Preprocessed source(s) and associated run script(s) are located at:
> clang: note: diagnostic msg: /tmp/atomic_store-j00aLw.cpp
> clang: note: diagnostic msg: /tmp/atomic_store-j00aLw.sh
> clang: note: diagnostic msg:
> 
> ********************
> 
> Any ideas?
> 
> 
> --> http://en.cppreference.com/w/c/types/integer
> --> http://en.cppreference.com/w/cpp/atomic/atomic/operator%3D
> 
> Thanks,
> 
> Michael Blocksome
> Blue Gene Messaging
> blocksom at us.ibm.com _______________________________________________
> llvm-bgq-discuss mailing list
> llvm-bgq-discuss at lists.alcf.anl.gov
> https://lists.alcf.anl.gov/mailman/listinfo/llvm-bgq-discuss
> 
> 
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