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Add support for struct > 4B returned via registers

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On ARM with hardfloat calling convention, structure containing 4 fields
or less of the same float type are returned via float registers. This
means that a structure can be returned in up to 4 double registers in a
structure is composed of 4 doubles. This commit adds support for return
of structures in several registers.
This commit is contained in:
Thomas Preud'homme
2013-11-22 09:27:15 +08:00
parent d9d60a1ebd
commit dcec8673f2
5 changed files with 77 additions and 49 deletions
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9
i386-gen.c
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@ -374,7 +374,8 @@ static void gcall_or_jmp(int is_jmp)
static uint8_t fastcall_regs[3] = { TREG_EAX, TREG_EDX, TREG_ECX };
static uint8_t fastcallw_regs[2] = { TREG_ECX, TREG_EDX };
/* Return 1 if this function returns via an sret pointer, 0 otherwise */
/* Return the number of registers needed to return the struct, or 0 if
returning via struct pointer. */
ST_FUNC int gfunc_sret(CType *vt, CType *ret, int *ret_align)
{
#ifdef TCC_TARGET_PE
@ -383,11 +384,11 @@ ST_FUNC int gfunc_sret(CType *vt, CType *ret, int *ret_align)
*ret_align = 1; // Never have to re-align return values for x86
size = type_size(vt, &align);
if (size > 8) {
return 1;
return 0;
} else if (size > 4) {
ret->ref = NULL;
ret->t = VT_LLONG;
return 0;
return 1;
} else {
ret->ref = NULL;
ret->t = VT_INT;
@ -395,7 +396,7 @@ ST_FUNC int gfunc_sret(CType *vt, CType *ret, int *ret_align)
}
#else
*ret_align = 1; // Never have to re-align return values for x86
return 1;
return 0;
#endif
}