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Fix alignment around struct for SSE.

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- Fix a wrong calculation for size of struct
- Handle cases where struct size isn't multple of 8
- Recover vstack after memcpy for pushing struct
- Add a float parameter for struct_assign_test1 to check SSE alignment
This commit is contained in:
Shinichiro Hamaji 2010-08-27 01:28:52 +09:00
parent 4ab4efd3a6
commit 1f6781f0ee
2 changed files with 21 additions and 9 deletions
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6
tests/tcctest.c
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@ -1061,9 +1061,9 @@ struct structa1 {
struct structa1 ssta1;
void struct_assign_test1(struct structa1 s1, int t)
void struct_assign_test1(struct structa1 s1, int t, float f)
{
printf("%d %d %d\n", s1.f1, s1.f2, t);
printf("%d %d %d %f\n", s1.f1, s1.f2, t, f);
}
struct structa1 struct_assign_test2(struct structa1 s1, int t)
@ -1089,7 +1089,7 @@ void struct_assign_test(void)
lsta2.f1 = 1;
lsta2.f2 = 2;
#endif
struct_assign_test1(lsta2, 3);
struct_assign_test1(lsta2, 3, 4.5);
printf("before call: %d %d\n", lsta2.f1, lsta2.f2);
lsta2 = struct_assign_test2(lsta2, 4);

24
x86_64-gen.c
View File

@ -820,7 +820,8 @@ void gfunc_call(int nb_args)
args_size = 0;
for(i = 0; i < nb_args; i++) {
if ((vtop[-i].type.t & VT_BTYPE) == VT_STRUCT) {
args_size += type_size(&vtop->type, &align);
args_size += type_size(&vtop[-i].type, &align);
args_size = (args_size + 3) & ~3;
} else if ((vtop[-i].type.t & VT_BTYPE) == VT_LDOUBLE) {
args_size += 16;
} else if (is_sse_float(vtop[-i].type.t)) {
@ -840,9 +841,16 @@ void gfunc_call(int nb_args)
sse_reg = nb_sse_args;
/* adjust stack to align SSE boundary */
if (args_size &= 8) {
o(0x50); /* push $rax */
if (args_size &= 15) {
/* fetch cpu flag before the following sub will change the value */
if (vtop >= vstack && (vtop->r & VT_VALMASK) == VT_CMP)
gv(RC_INT);
args_size = 16 - args_size;
o(0x48);
oad(0xec81, args_size); /* sub $xxx, %rsp */
}
for(i = 0; i < nb_args; i++) {
if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
size = type_size(&vtop->type, &align);
@ -856,12 +864,16 @@ void gfunc_call(int nb_args)
orex(1, r, 0, 0x89); /* mov %rsp, r */
o(0xe0 + REG_VALUE(r));
{
/* following code breaks vtop[1] */
SValue tmp = vtop[1];
/* following code breaks vtop[1], vtop[2], and vtop[3] */
SValue tmp1 = vtop[1];
SValue tmp2 = vtop[2];
SValue tmp3 = vtop[3];
vset(&vtop->type, r | VT_LVAL, 0);
vswap();
vstore();
vtop[1] = tmp;
vtop[1] = tmp1;
vtop[2] = tmp2;
vtop[3] = tmp3;
}
args_size += size;
} else if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {