[LLVMbugs] [Bug 16692] New: Microblaze Backend Inline Assembler Fault

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16692

            Bug ID: 16692
           Summary: Microblaze Backend Inline Assembler Fault
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: slugonamission at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The MBlaze asm printer does not work correctly when using input or output
constraints, causing llc to exit with the following error:

error: invalid operand in inline asm: 'add $0, r0, r0'

This is generated from lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp:400. It
appears to originate from "PrintAsmOperand()" in
lib/Target/MBlaze/MBlazeAsmPrinter.cpp. 

Given the indentation of the switch statement within this function (and the
actual statements), it appears as it should belong to the outer-if statement
(if(ExtraCode && ExtraCode[0])), although there are no braces to support this.
Adding braces to add the switch statement to the outer if seems to fix the
problem, although I've not submitted this as a patch incase I've missed some
nuance of doing this.

A simple test case is as follows. Compile using "clang -S -emit-llvm -target
MBlaze test.c -o test.bc", then "llc -march=mblaze test.bc".

int main()
{
    volatile int x = 5;
    asm("add %0, r0, r0" : "=r"(x) : : "r5");
    return 0;
}

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