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i915g: Improve SIN/COS a bit.

This commit is contained in:
Stéphane Marchesin 2011-06-28 00:53:01 -07:00
parent 77896b256a
commit 062a1e291f
1 changed files with 20 additions and 20 deletions
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40
src/gallium/drivers/i915/i915_fpc_translate.c
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@ -72,19 +72,33 @@ static unsigned passthrough[] =
/* 1, -1/3!, 1/5!, -1/7! */
static const float sin_constants[4] = { 1.0,
static const float scs_sin_constants[4] = { 1.0,
-1.0f / (3 * 2 * 1),
1.0f / (5 * 4 * 3 * 2 * 1),
-1.0f / (7 * 6 * 5 * 4 * 3 * 2 * 1)
};
/* 1, -1/2!, 1/4!, -1/6! */
static const float cos_constants[4] = { 1.0,
static const float scs_cos_constants[4] = { 1.0,
-1.0f / (2 * 1),
1.0f / (4 * 3 * 2 * 1),
-1.0f / (6 * 5 * 4 * 3 * 2 * 1)
};
/* 1, -1/3!, 1/5!, -1/7! */
static const float sin_constants[4] = { 2.0 * M_PI,
-8.0f * M_PI * M_PI * M_PI / (3 * 2 * 1),
32.0f * M_PI * M_PI * M_PI * M_PI * M_PI / (5 * 4 * 3 * 2 * 1),
-128.0f * M_PI * M_PI * M_PI * M_PI * M_PI * M_PI * M_PI / (7 * 6 * 5 * 4 * 3 * 2 * 1)
};
/* 1, -1/2!, 1/4!, -1/6! */
static const float cos_constants[4] = { 1.0,
-4.0f * M_PI * M_PI / (2 * 1),
16.0f * M_PI * M_PI * M_PI * M_PI / (4 * 3 * 2 * 1),
-64.0f * M_PI * M_PI * M_PI * M_PI * M_PI * M_PI / (6 * 5 * 4 * 3 * 2 * 1)
};
/**
@ -483,13 +497,6 @@ i915_translate_instruction(struct i915_fp_compile *p,
i915_emit_arith(p, A0_MOD, tmp, A0_DEST_CHANNEL_X, 0, tmp, 0, 0);
/* By choosing different taylor constants, could get rid of this mul:
*/
i915_emit_arith(p,
A0_MUL,
tmp, A0_DEST_CHANNEL_X, 0,
tmp, i915_emit_const1f(p, (float) (M_PI * 2.0)), 0);
/*
* t0.xy = MUL x.xx11, x.x1111 ; x^2, x, 1, 1
* t0 = MUL t0.xyxy t0.xx11 ; x^4, x^3, x^2, 1
@ -772,9 +779,9 @@ i915_translate_instruction(struct i915_fp_compile *p,
* t0.xy = MUL x.xx11, x.x1111 ; x^2, x, 1, 1
* t0 = MUL t0.xyxy t0.xx11 ; x^4, x^3, x^2, x
* t1 = MUL t0.xyyw t0.yz11 ; x^7 x^5 x^3 x
* scs.x = DP4 t1, sin_constants
* scs.x = DP4 t1, scs_sin_constants
* t1 = MUL t0.xxz1 t0.z111 ; x^6 x^4 x^2 1
* scs.y = DP4 t1, cos_constants
* scs.y = DP4 t1, scs_cos_constants
*/
i915_emit_arith(p,
A0_MUL,
@ -809,7 +816,7 @@ i915_translate_instruction(struct i915_fp_compile *p,
get_result_vector(p, &inst->Dst[0]),
A0_DEST_CHANNEL_Y, 0,
swizzle(tmp1, W, Z, Y, X),
i915_emit_const4fv(p, sin_constants), 0);
i915_emit_const4fv(p, scs_sin_constants), 0);
}
if (writemask & TGSI_WRITEMASK_X) {
@ -824,7 +831,7 @@ i915_translate_instruction(struct i915_fp_compile *p,
get_result_vector(p, &inst->Dst[0]),
A0_DEST_CHANNEL_X, 0,
swizzle(tmp, ONE, Z, Y, X),
i915_emit_const4fv(p, cos_constants), 0);
i915_emit_const4fv(p, scs_cos_constants), 0);
}
break;
@ -871,13 +878,6 @@ i915_translate_instruction(struct i915_fp_compile *p,
i915_emit_arith(p, A0_MOD, tmp, A0_DEST_CHANNEL_X, 0, tmp, 0, 0);
/* By choosing different taylor constants, could get rid of this mul:
*/
i915_emit_arith(p,
A0_MUL,
tmp, A0_DEST_CHANNEL_X, 0,
tmp, i915_emit_const1f(p, (float) (M_PI * 2.0)), 0);
/*
* t0.xy = MUL x.xx11, x.x1111 ; x^2, x, 1, 1
* t0 = MUL t0.xyxy t0.xx11 ; x^4, x^3, x^2, x