From dcec8673f21da86ae3dcf1ca3e9498127715b795 Mon Sep 17 00:00:00 2001 From: Thomas Preud'homme Date: Fri, 22 Nov 2013 09:27:15 +0800 Subject: Add support for struct > 4B returned via registers 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. --- i386-gen.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'i386-gen.c') diff --git a/i386-gen.c b/i386-gen.c index 0a6d4d3..eaab2b7 100644 --- a/i386-gen.c +++ b/i386-gen.c @@ -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 } -- cgit v1.3.1