diff options
Diffstat (limited to 'tccgen.c')
| -rw-r--r-- | tccgen.c | 37 |
1 files changed, 8 insertions, 29 deletions
@@ -458,7 +458,7 @@ static void vseti(int r, int v) ST_FUNC void vswap(void) { - unsigned long *vtopl; + SValue tmp; /* cannot let cpu flags if other instruction are generated. Also avoid leaving VT_JMP anywhere except on the top of the stack because it would complicate the code generator. */ @@ -467,35 +467,14 @@ ST_FUNC void vswap(void) if (v == VT_CMP || (v & ~1) == VT_JMP) gv(RC_INT); } + tmp = vtop[0]; + vtop[0] = vtop[-1]; + vtop[-1] = tmp; - /* - * vtop[0], vtop[-1] = vtop[-1], vtop[0] - * - * vswap is called often and exchanging vtop[0] vs vtop[-1] is hot on - * profile, so it is hand optimized - */ - vtopl = (unsigned long *) vtop; -# define VSIZEL (sizeof(*vtop) / sizeof(*vtopl)) - - _STATIC_ASSERT( VSIZEL*sizeof(*vtopl) == sizeof(*vtop) ); - _STATIC_ASSERT( VSIZEL <= 16 ); /* should be enough */ - switch(VSIZEL) { -# define VSWAPL(i) \ - case i+1: { \ - unsigned long tmpl; \ - tmpl = vtopl[i]; \ - vtopl[i] = vtopl[-1*VSIZEL + i]; \ - vtopl[-1*VSIZEL + i] = tmpl; \ - } do {} while (0) - - VSWAPL(15); VSWAPL(14); VSWAPL(13); VSWAPL(12); - VSWAPL(11); VSWAPL(10); VSWAPL( 9); VSWAPL( 8); - VSWAPL( 7); VSWAPL( 6); VSWAPL( 5); VSWAPL( 4); - VSWAPL( 3); VSWAPL( 2); VSWAPL( 1); VSWAPL( 0); - } - -# undef VSWAPL -# undef VSIZEL +/* XXX: +2% overall speed possible with optimized memswap + * + * memswap(&vtop[0], &vtop[1], sizeof *vtop); + */ } ST_FUNC void vpushv(SValue *v) |