[LLVMbugs] [Bug 9855] New: trying to call an inlined function, causing link failure

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9855

           Summary: trying to call an inlined function, causing link
                    failure
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: if.html at gmail.com
                CC: llvmbugs at cs.uiuc.edu


code:

#include <stdio.h>
inline unsigned int f(unsigned int x){
    if(x%2==0) {
        return x/2;
    } else {
        return 3*x+1;
    }
}
int main(){
    unsigned int x;
    for(scanf("%d",&x); x!=1; printf("%d\n", x))
        x=f(x);
    return 0;
}

---------
what clang compiles to:

    .def     _main;
    .scl    2;
    .type    32;
    .endef
    .text
    .globl    _main
    .align    16, 0x90
_main:
    pushl    %ebp
    movl    %esp, %ebp
    subl    $24, %esp
    calll    ___main
    leal    L_.str, %eax
    leal    -8(%ebp), %ecx
    movl    $0, -4(%ebp)
    movl    %eax, (%esp)
    movl    %ecx, 4(%esp)
    calll    _scanf
    movl    %eax, -12(%ebp)
LBB0_1:
    cmpl    $1, -8(%ebp)
    je    LBB0_4
    movl    -8(%ebp), %eax
    movl    %eax, (%esp)
    calll    _f              ; <=== here
    movl    %eax, -8(%ebp)
    leal    L_.str1, %eax
    movl    -8(%ebp), %ecx
    movl    %eax, (%esp)
    movl    %ecx, 4(%esp)
    calll    _printf
    movl    %eax, -16(%ebp)
    jmp    LBB0_1
LBB0_4:
    movl    $0, %eax
    addl    $24, %esp
    popl    %ebp
    ret

    .data
L_.str:
    .asciz     "%d"

L_.str1:
    .asciz     "%d\n"

------

BTW, with -O2 option, clang generates correct assembly

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