[LLVMbugs] [Bug 15211] New: Clang doesn't react to some constraints in inline asm instructions

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15211

            Bug ID: 15211
           Summary: Clang doesn't react to some constraints in inline asm
                    instructions
           Product: clang
           Version: 3.2
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ili.filippov at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

We can write simple test:

void f() {
    register int in asm("ebx") = 0;
    __asm("test %h0, %h0" : : "A"(in)); 
}

and watch clang's assembler for it.
We will see:

        movl    $0, -12(%rbp)
        movl    -12(%rbp), %ebx
        ## InlineAsm Start
        test %bh, %bh
        ## InlineAsm End

But constraint "A" says, that input parameter must be placed in eax.
Other constraints have the same errors.




--
Software Engineer
Intel Compiler Team
Intel Corp.

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