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Convert a number of places in core and plugins to use the BIT_N() macro instead of 1<<n. Speeds up things on SH1, and also reduces core binsize. Most notable speedups: 1 bit lcd driver: drawpixel +20%, drawline + 27%, hline +5%; jpeg viewer: +8% for 1/8 scaling. Other targets are unaffected.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21205 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2009-06-07 21:27:05 +00:00
parent c3182ec333
commit 1d6df54df2
24 changed files with 88 additions and 70 deletions
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10
apps/plugins/rockboy/cpu.c
View file

@ -147,9 +147,9 @@ F = (F & (FN)) | ZFLAG(A) | daa_carry_table[LB(acc)>>2]; }
(r) = swap_table[(r)]; \
F = ZFLAG((r)); }
#define BIT(n,r) { F = (F & FC) | ZFLAG(((r) & (1 << (n)))) | FH; }
#define RES(n,r) { (r) &= ~(1 << (n)); }
#define SET(n,r) { (r) |= (1 << (n)); }
#define BIT(n,r) { F = (F & FC) | ZFLAG(((r) & BIT_N(n))) | FH; }
#define RES(n,r) { (r) &= ~BIT_N(n); }
#define SET(n,r) { (r) |= BIT_N(n); }
#define CB_REG_CASES(r, n) \
case 0x00|(n): RLC(r); break; \
@ -225,7 +225,7 @@ label: op(b); break;
#define PRE_INT ( DI, PUSH(PC) )
#define THROW_INT(n) ( (IF &= ~(1<<(n))), (PC = 0x40+((n)<<3)) )
#define THROW_INT(n) ( (IF &= ~BIT_N(n)), (PC = 0x40+((n)<<3)) )
#ifdef DYNAREC
un32 reg_backup[16];
@ -355,7 +355,7 @@ static int cpu_idle(int max)
/* Figure out when the next timer interrupt will happen */
unit = ((-R_TAC) & 3) << 1;
cnt = (511 - cpu.tim + (1<<unit)) >> unit;
cnt = (511 - cpu.tim + BIT_N(unit)) >> unit;
cnt += (255 - R_TIMA) << (9 - unit);
if (max < cnt)

4
apps/plugins/rockboy/lcd.c
View file

@ -216,8 +216,8 @@ static void updatepatpix(void)
a = ((i<<4) | (j<<1));
for (k = 0; k < 8; k++)
{
c = vram[a] & (1<<k) ? 1 : 0;
c |= vram[a+1] & (1<<k) ? 2 : 0;
c = vram[a] & BIT_N(k) ? 1 : 0;
c |= vram[a+1] & BIT_N(k) ? 2 : 0;
patpix[i+1024][j][k] = c;
}
for (k = 0; k < 8; k++)

2
apps/plugins/rockboy/sound.c
View file

@ -182,7 +182,7 @@ static void gbSoundChannel1(int *r, int *l)
int newfreq = 0;
if(S1.swsteps)
{
newfreq = freq + updown * freq / (1 << S1.swsteps);
newfreq = freq + updown * freq / BIT_N(S1.swsteps);
if(newfreq == freq)
newfreq = 0;
}