[LLVMbugs] [Bug 6203] New: [mips] cannot copy register from FGR32 to AFGR64 class

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=6203

           Summary: [mips] cannot copy register from FGR32 to AFGR64 class
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: ASSIGNED
          Keywords: compile-fail
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: bruno.cardoso at gmail.com
        ReportedBy: zhou_shuchang at sina.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=4163)
 --> (http://llvm.org/bugs/attachment.cgi?id=4163)
cannot copy register from FGR32 to AFGR64 class

#include <stdio.h>
int main()
{
        register unsigned char rC0, rC1;
        rC0 = 0;
        rC1 = 255;
        rC0 +=  (float) rC1;
        if(rC0 == 255)
                printf("passed\n");
        else
                printf("failed\n");
        return 0;
}

we have assertion failure
clang: /home/zsc/tmpd/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp:291: void
llvm::InstrEmitter::AddRegisterOperand(llvm::MachineInstr*, llvm::SDValue,
unsigned int, const llvm::TargetInstrDesc*, llvm::DenseMap<llvm::SDValue,
unsigned int, llvm::DenseMapInfo<llvm::SDValue>, llvm::DenseMapInfo<unsigned
int> >&): Assertion `Emitted && "Unable to issue a copy instruction!\n"'
failed.

0.      Program arguments: /usr/local/bin/clang -cc1 -triple
mipsel-unknown-linux-gnu -S -disable-free -main-file-name 16.c -pic-level 2
-mdisable-fp-elim -v -g -resource-dir /usr/local/lib/clang/1.1 -fmessage-length
87 -fgnu-runtime -fdiagnostics-show-option -fcolor-diagnostics -o 16.s -x c
16.c 

By GDB, bool MipsInstrInfo::copyRegToReg returns false

(gdb) p SrcRC->Name
$8 = 0x9575a01 "FGR32"
(gdb) p DestRC->Name
$9 = 0x95759ee "AFGR64"
(gdb) f
#0  llvm::MipsInstrInfo::copyRegToReg (this=0x9cf7548, MBB=..., I=...,
DestReg=1039, SrcReg=1036, DestRC=0x9c5aec0, SrcRC=0x9c5afe0) at
/home/zsc/tmpd/llvm/lib/Target/Mips/MipsInstrInfo.cpp:169


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