tccgen: arm/i386: save_reg_upstack

tccgen.c:gv() when loading long long from lvalue, before
was saving all registers which caused problems in the arm
function call register parameter preparation, as with

    void foo(long long y, int x);
    int main(void)
    {
      unsigned int *xx[1], x;
      unsigned long long *yy[1], y;
      foo(**yy, **xx);
      return 0;
    }

Now only the modified register is saved if necessary,
as in this case where it is used to store the result
of the post-inc:

        long long *p, v, **pp;
        v = 1;
        p = &v;
        p[0]++;
        printf("another long long spill test : %lld\n", *p);

i386-gen.c :
- found a similar problem with TOK_UMULL caused by the
  vstack juggle in tccgen:gen_opl()
  (bug seen only when using EBX as 4th register)

1 files changed, 1 insertions, 0 deletions

diff --git a/tcc.h b/tcc.h
index c25ab01..49fde3b 100644
--- a/tcc.h
+++ b/tcc.h
@@ -1295,6 +1295,7 @@ ST_FUNC void lexpand_nr(void);
 #endif
 ST_FUNC void vpushv(SValue *v);
 ST_FUNC void save_reg(int r);
+ST_FUNC void save_reg_upstack(int r, int n);
 ST_FUNC int get_reg(int rc);
 ST_FUNC void save_regs(int n);
 ST_FUNC void gaddrof(void);