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Enable strict aliasing optimizations for codecs on gcc versions >= 4.0, fix alising violations that this uncovered, gives small speedups for most codecs, FS#10801

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23784 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Nils Wallménius 2009-11-29 18:11:49 +00:00
parent 685ca2672e
commit 13f08d70fd
5 changed files with 38 additions and 33 deletions
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21
apps/codecs/libspc/spc_dsp.c
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@ -77,12 +77,13 @@ static void decode_brr( struct Spc_Dsp* this, unsigned start_addr,
/* setup same variables as where decode_brr() is called from */
#undef RAM
#define RAM ram.ram
struct src_dir const* const sd =
(struct src_dir*) &RAM [this->r.g.wave_page * 0x100];
&ram.sd[this->r.g.wave_page * 0x100/sizeof(struct src_dir)];
struct cache_entry_t* const wave_entry =
&this->wave_entry [raw_voice->waveform];
/* the following block can be put in place of the call to
/* the following block can be put in place of the call to
decode_brr() below
*/
{
@ -106,7 +107,7 @@ static void decode_brr( struct Spc_Dsp* this, unsigned start_addr,
wave_entry->start_addr = start_addr;
uint8_t const* const loop_ptr =
RAM + GET_LE16A( sd [raw_voice->waveform].loop );
RAM + letoh16(sd[raw_voice->waveform].loop);
short* loop_start = 0;
short* out = BRRcache + start_addr * 2;
@ -251,7 +252,7 @@ static void key_on(struct Spc_Dsp* const this, struct voice_t* const voice,
voice->envx = 0;
voice->env_mode = state_attack;
voice->env_timer = env_rate_init; /* TODO: inaccurate? */
unsigned start_addr = GET_LE16A(sd [raw_voice->waveform].start);
unsigned start_addr = letoh16(sd[raw_voice->waveform].start);
#if !SPC_BRRCACHE
{
voice->addr = RAM + start_addr;
@ -331,9 +332,9 @@ void DSP_run_( struct Spc_Dsp* this, long count, int32_t* out_buf )
}
while ( (vbit >>= 1) != 0 );
}
struct src_dir const* const sd =
(struct src_dir*) &RAM [this->r.g.wave_page * 0x100];
struct src_dir const* const sd =
&ram.sd[this->r.g.wave_page * 0x100/sizeof(struct src_dir)];
#ifdef ROCKBOX_BIG_ENDIAN
/* Convert endiannesses before entering loops - these
@ -358,7 +359,7 @@ void DSP_run_( struct Spc_Dsp* this, long count, int32_t* out_buf )
const int echo_start = this->r.g.echo_page * 0x100;
#endif /* CPU_COLDFIRE */
#else
#define VOICE_RATE(x) (INT16A(raw_voice->rate) & 0x3FFF)
#define VOICE_RATE(x) (GET_LE16(raw_voice->rate) & 0x3FFF)
#define IF_RBE(...)
#endif /* ROCKBOX_BIG_ENDIAN */
@ -590,7 +591,7 @@ void DSP_run_( struct Spc_Dsp* this, long count, int32_t* out_buf )
/* action based on previous block's header */
if ( voice->block_header & 1 )
{
addr = RAM + GET_LE16A( sd [raw_voice->waveform].loop );
addr = RAM + letoh16(sd[raw_voice->waveform].loop);
this->r.g.wave_ended |= vbit;
if ( !(voice->block_header & 2) ) /* 1% of the time */
{