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Improve code generation in opj_t1_dec_clnpass() 

Add a opj_t1_dec_clnpass_step_only_if_flag_not_sig_visit() method that
does the job of opj_t1_dec_clnpass_step_only() assuming the conditions
are met. And use it in opj_t1_dec_clnpass(). The compiler generates
more efficient code.
This commit is contained in:
Even Rouault 2016-05-21 15:52:02 +02:00
parent c539808d09
commit d8fef96f23
1 changed files with 43 additions and 4 deletions
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47
src/lib/openjp2/t1.c
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@ -906,6 +906,32 @@ static void opj_t1_dec_clnpass_step(
*flagsp &= ~T1_VISIT;
} /* VSC and BYPASS by Antonin */
static void opj_t1_dec_clnpass_step_only_if_flag_not_sig_visit(
opj_t1_t *t1,
opj_flag_t *flagsp,
OPJ_INT32 *datap,
OPJ_INT32 orient,
OPJ_INT32 oneplushalf)
{
OPJ_INT32 v;
OPJ_INT32 flag;
opj_mqc_t *mqc = t1->mqc; /* MQC component */
flag = *flagsp;
/*if (!(flag & (T1_SIG | T1_VISIT)))*/
{
opj_mqc_setcurctx(mqc, opj_t1_getctxno_zc((OPJ_UINT32)flag, (OPJ_UINT32)orient));
if (opj_mqc_decode(mqc)) {
opj_mqc_setcurctx(mqc, opj_t1_getctxno_sc((OPJ_UINT32)flag));
v = opj_mqc_decode(mqc) ^ opj_t1_getspb((OPJ_UINT32)flag);
*datap = v ? -oneplushalf : oneplushalf;
opj_t1_updateflags(flagsp, v, t1->flags_stride);
}
}
/*flagsp &= ~T1_VISIT;*/
}
static void opj_t1_dec_clnpass_step_vsc(
opj_t1_t *t1,
opj_flag_t *flagsp,
@ -1084,17 +1110,30 @@ static void opj_t1_dec_clnpass(
data2 += t1->w;
}
} else {
opj_flag_t flag;
flags2 += t1->flags_stride;
opj_t1_dec_clnpass_step(t1, flags2, data2, orient, oneplushalf);
flag = *flags2;
if (!(flag & (T1_SIG | T1_VISIT)))
opj_t1_dec_clnpass_step_only_if_flag_not_sig_visit(t1, flags2, data2, orient, oneplushalf);
*flags2 &= ~T1_VISIT;
data2 += t1->w;
flags2 += t1->flags_stride;
opj_t1_dec_clnpass_step(t1, flags2, data2, orient, oneplushalf);
flag = *flags2;
if (!(flag & (T1_SIG | T1_VISIT)))
opj_t1_dec_clnpass_step_only_if_flag_not_sig_visit(t1, flags2, data2, orient, oneplushalf);
*flags2 &= ~T1_VISIT;
data2 += t1->w;
flags2 += t1->flags_stride;
opj_t1_dec_clnpass_step(t1, flags2, data2, orient, oneplushalf);
flag = *flags2;
if (!(flag & (T1_SIG | T1_VISIT)))
opj_t1_dec_clnpass_step_only_if_flag_not_sig_visit(t1, flags2, data2, orient, oneplushalf);
*flags2 &= ~T1_VISIT;
data2 += t1->w;
flags2 += t1->flags_stride;
opj_t1_dec_clnpass_step(t1, flags2, data2, orient, oneplushalf);
flag = *flags2;
if (!(flag & (T1_SIG | T1_VISIT)))
opj_t1_dec_clnpass_step_only_if_flag_not_sig_visit(t1, flags2, data2, orient, oneplushalf);
*flags2 &= ~T1_VISIT;
data2 += t1->w;
}
}