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vc4: Avoid an extra temporary and mov in ffloor/ffract/fceil.

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shader-db results:

total instructions in shared programs: 92611 -> 91764 (-0.91%)
instructions in affected programs:     27417 -> 26570 (-3.09%)

The star is one shader in glmark2's terrain (drops 16% of its
instructions), but there are also wins in mupen64plus and glb2.7.
This commit is contained in:
Eric Anholt 2017-01-18 14:23:14 +11:00
parent 0079df0b2d
commit c1299615fb
1 changed files with 18 additions and 13 deletions
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31
src/gallium/drivers/vc4/vc4_program.c
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@ -599,9 +599,11 @@ ntq_ffract(struct vc4_compile *c, struct qreg src)
struct qreg trunc = qir_ITOF(c, qir_FTOI(c, src));
struct qreg diff = qir_FSUB(c, src, trunc);
qir_SF(c, diff);
return qir_MOV(c, qir_SEL(c, QPU_COND_NS,
qir_FADD(c, diff, qir_uniform_f(c, 1.0)),
diff));
qir_FADD_dest(c, diff,
diff, qir_uniform_f(c, 1.0))->cond = QPU_COND_NS;
return qir_MOV(c, diff);
}
/**
@ -611,16 +613,18 @@ ntq_ffract(struct vc4_compile *c, struct qreg src)
static struct qreg
ntq_ffloor(struct vc4_compile *c, struct qreg src)
{
struct qreg trunc = qir_ITOF(c, qir_FTOI(c, src));
struct qreg result = qir_ITOF(c, qir_FTOI(c, src));
/* This will be < 0 if we truncated and the truncation was of a value
* that was < 0 in the first place.
*/
qir_SF(c, qir_FSUB(c, src, trunc));
qir_SF(c, qir_FSUB(c, src, result));
return qir_MOV(c, qir_SEL(c, QPU_COND_NS,
qir_FSUB(c, trunc, qir_uniform_f(c, 1.0)),
trunc));
struct qinst *sub = qir_FSUB_dest(c, result,
result, qir_uniform_f(c, 1.0));
sub->cond = QPU_COND_NS;
return qir_MOV(c, result);
}
/**
@ -630,16 +634,17 @@ ntq_ffloor(struct vc4_compile *c, struct qreg src)
static struct qreg
ntq_fceil(struct vc4_compile *c, struct qreg src)
{
struct qreg trunc = qir_ITOF(c, qir_FTOI(c, src));
struct qreg result = qir_ITOF(c, qir_FTOI(c, src));
/* This will be < 0 if we truncated and the truncation was of a value
* that was > 0 in the first place.
*/
qir_SF(c, qir_FSUB(c, trunc, src));
qir_SF(c, qir_FSUB(c, result, src));
return qir_MOV(c, qir_SEL(c, QPU_COND_NS,
qir_FADD(c, trunc, qir_uniform_f(c, 1.0)),
trunc));
qir_FADD_dest(c, result,
result, qir_uniform_f(c, 1.0))->cond = QPU_COND_NS;
return qir_MOV(c, result);
}
static struct qreg