[Bug target/38900] ICE: unable to find a register to spill

[ktietz at gcc dot gnu dot org]

------- Comment #11 from ktietz at gcc dot gnu dot org  2009-07-06 16:12 -------
(In reply to comment #10)
> > Well, why? For save or called saved registers the functions epilogue/prologue
> > takes care. The reason why gcc tries to choose ebx for call address register
> > here, is exactly this reason, as it can be sure that after the sibcall, the
> > register is still valid.
> 
> What's the assembly code generated with your patch?
> 

Compiling the test case with -O2

        .file   "c_impfast.c"
        .text
        .p2align 4,,15
.globl _f
        .def    _f;     .scl    2;      .type   32;     .endef
_f:
        pushl   %ebp
        movl    $2, %ecx
        movl    %esp, %ebp
        pushl   %ebx
        subl    $4, %esp
        movl    __imp_@h@4, %ebx
        call    *%ebx
        addl    $4, %esp
        movl    $1, %ecx
        popl    %ebx
        popl    %ebp
        jmp     *%ebx


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38900