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Functions with no prototypes might use EAX registers.

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This commit is contained in:
acqn 2021-01-24 18:19:51 +08:00 committed by Oliver Schmidt
parent a1992702f8
commit c9ac515286
1 changed files with 17 additions and 11 deletions
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28
src/cc65/codeinfo.c
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@ -493,22 +493,28 @@ fncls_t GetFuncInfo (const char* Name, unsigned int* Use, unsigned int* Chg)
** registers.
*/
*Use = REG_EAXY;
} else if (D->ParamCount > 0 &&
} else if ((D->ParamCount > 0 ||
(D->Flags & FD_EMPTY) != 0) &&
(AutoCDecl ?
IsQualFastcall (E->Type) :
!IsQualCDecl (E->Type))) {
/* Will use registers depending on the last param. If the last
** param has incomplete type, just assume __EAX__.
** param has incomplete type, or if the function has not been
** prototyped yet, just assume __EAX__.
*/
switch (SizeOf (D->LastParam->Type)) {
case 1u:
*Use = REG_A;
break;
case 2u:
*Use = REG_AX;
break;
default:
*Use = REG_EAX;
if (D->LastParam != 0) {
switch (SizeOf(D->LastParam->Type)) {
case 1u:
*Use = REG_A;
break;
case 2u:
*Use = REG_AX;
break;
default:
*Use = REG_EAX;
}
} else {
*Use = REG_EAX;
}
} else {
/* Will not use any registers */