Hi, On Sun, Jan 17, 2016 at 6:21 PM, Henrik Gramner <hen...@gramner.com> wrote:
> When allocating stack space with a larger alignment than the known stack > alignment a temporary register is used for storing the stack pointer. > Ensure that this isn't one of the registers used for passing arguments. > --- > libavutil/x86/x86inc.asm | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/libavutil/x86/x86inc.asm b/libavutil/x86/x86inc.asm > index fc58b74..c355ee7 100644 > --- a/libavutil/x86/x86inc.asm > +++ b/libavutil/x86/x86inc.asm > @@ -386,8 +386,10 @@ DECLARE_REG_TMP_SIZE > 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14 > %if %1 != 0 && required_stack_alignment > STACK_ALIGNMENT > %if %1 > 0 > %assign regs_used (regs_used + 1) > - %elif ARCH_X86_64 && regs_used == num_args && num_args <= 4 + > UNIX64 * 2 > - %warning "Stack pointer will overwrite register argument" > + %endif > + %if ARCH_X86_64 && regs_used < 5 + UNIX64 * 3 > + ; Ensure that we don't clobber any registers containing > arguments > + %assign regs_used 5 + UNIX64 * 3 Why 5 + unix * 3 and not 5 +unix * 2? Isn't unix64 6 regs and win64 4 regs? Ronald _______________________________________________ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
