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tccgen: factor out gfunc_return

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Also:
- on windows i386 and x86-64, structures of size <= 8 are
  NOT returned in registers if size is not one of 1,2,4,8.
- cleanup: put all tv-push/pop/swap/rot into one place
This commit is contained in:
grischka
2017-02-08 19:45:31 +01:00
parent f077d16c20
commit 68666eee2a
5 changed files with 199 additions and 212 deletions
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21
i386-gen.c
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@ -396,21 +396,21 @@ ST_FUNC int gfunc_sret(CType *vt, int variadic, CType *ret, int *ret_align, int
{
#ifdef TCC_TARGET_PE
int size, align;
*ret_align = 1; // Never have to re-align return values for x86
*regsize = 4;
size = type_size(vt, &align);
if (size > 8) {
if (size > 8 || (size & (size - 1)))
return 0;
} else if (size > 4) {
ret->ref = NULL;
if (size == 8)
ret->t = VT_LLONG;
return 1;
} else {
ret->ref = NULL;
else if (size == 4)
ret->t = VT_INT;
return 1;
}
else if (size == 2)
ret->t = VT_SHORT;
else
ret->t = VT_BYTE;
ret->ref = NULL;
return 1;
#else
*ret_align = 1; // Never have to re-align return values for x86
return 0;
@ -547,7 +547,8 @@ ST_FUNC void gfunc_prolog(CType *func_type)
func_var = (sym->c == FUNC_ELLIPSIS);
#ifdef TCC_TARGET_PE
size = type_size(&func_vt,&align);
if (((func_vt.t & VT_BTYPE) == VT_STRUCT) && (size > 8)) {
if (((func_vt.t & VT_BTYPE) == VT_STRUCT)
&& (size > 8 || (size & (size - 1)))) {
#else
if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
#endif