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

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Jul 24 08:02:04 PDT 2013


            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

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;

You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20130724/775d3dc4/attachment.html>

More information about the llvm-bugs mailing list