diff options
| -rw-r--r-- | tcc.h | 4 | ||||
| -rw-r--r-- | tccgen.c | 34 |
2 files changed, 33 insertions, 5 deletions
@@ -228,6 +228,10 @@ #define true 1 typedef int BOOL; +#ifndef _STATIC_ASSERT +#define _STATIC_ASSERT(cond) do { (void) sizeof(char [1 - 2*!(cond)]); } while(0) +#endif + #define INCLUDE_STACK_SIZE 32 #define IFDEF_STACK_SIZE 64 #define VSTACK_SIZE 256 @@ -458,8 +458,6 @@ static void vseti(int r, int v) ST_FUNC void vswap(void) { - 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. */ @@ -468,9 +466,35 @@ 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 + */ + unsigned long *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 } ST_FUNC void vpushv(SValue *v) |