Am 18.03.2012 23:16, schrieb Stefan Weil: > Most functions which handle exceptions don't return. > > With a compiler attribute (added by QEMU_NORETURN), > gcc can optimize the code.
Do you have any numbers? > > Signed-off-by: Stefan Weil <s...@weilnetz.de> Seems like a sensible optimization, Reviewed-by: Andreas Färber <afaer...@suse.de> Andreas > --- > def-helper.h | 7 +++++++ > 1 files changed, 7 insertions(+), 0 deletions(-) > > diff --git a/def-helper.h b/def-helper.h > index 0e70c31..b98ff69 100644 > --- a/def-helper.h > +++ b/def-helper.h > @@ -39,6 +39,7 @@ > #endif > #define dh_alias_ptr ptr > #define dh_alias_void void > +#define dh_alias_noreturn noreturn > #define dh_alias_env ptr > #define dh_alias(t) glue(dh_alias_, t) > > @@ -52,36 +53,42 @@ > #define dh_ctype_tl target_ulong > #define dh_ctype_ptr void * > #define dh_ctype_void void > +#define dh_ctype_noreturn void QEMU_NORETURN > #define dh_ctype_env CPUArchState * > #define dh_ctype(t) dh_ctype_##t > > /* We can't use glue() here because it falls foul of C preprocessor > recursive expansion rules. */ > #define dh_retvar_decl0_void void > +#define dh_retvar_decl0_noreturn void > #define dh_retvar_decl0_i32 TCGv_i32 retval > #define dh_retvar_decl0_i64 TCGv_i64 retval > #define dh_retvar_decl0_ptr TCGv_ptr retval > #define dh_retvar_decl0(t) glue(dh_retvar_decl0_, dh_alias(t)) > > #define dh_retvar_decl_void > +#define dh_retvar_decl_noreturn > #define dh_retvar_decl_i32 TCGv_i32 retval, > #define dh_retvar_decl_i64 TCGv_i64 retval, > #define dh_retvar_decl_ptr TCGv_ptr retval, > #define dh_retvar_decl(t) glue(dh_retvar_decl_, dh_alias(t)) > > #define dh_retvar_void TCG_CALL_DUMMY_ARG > +#define dh_retvar_noreturn TCG_CALL_DUMMY_ARG > #define dh_retvar_i32 GET_TCGV_i32(retval) > #define dh_retvar_i64 GET_TCGV_i64(retval) > #define dh_retvar_ptr GET_TCGV_ptr(retval) > #define dh_retvar(t) glue(dh_retvar_, dh_alias(t)) > > #define dh_is_64bit_void 0 > +#define dh_is_64bit_noreturn 0 > #define dh_is_64bit_i32 0 > #define dh_is_64bit_i64 1 > #define dh_is_64bit_ptr (TCG_TARGET_REG_BITS == 64) > #define dh_is_64bit(t) glue(dh_is_64bit_, dh_alias(t)) > > #define dh_is_signed_void 0 > +#define dh_is_signed_noreturn 0 > #define dh_is_signed_i32 0 > #define dh_is_signed_s32 1 > #define dh_is_signed_i64 0 -- SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
