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docs: add new option to docs

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This commit is contained in:
Recep Aslantas
2018-05-10 16:27:40 +03:00
parent da5ad69863
commit 599524dacf
3 changed files with 11 additions and 5 deletions
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8
docs/source/opt.rst
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@@ -5,7 +5,7 @@ Options
A few options are provided via macros.
Alignment
Alignment Option
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
As default, cglm requires types to be aligned. Alignment requirements:
@@ -34,3 +34,9 @@ have to compile cglm with **CGLM_ALL_UNALIGNED** macro.
ALWAYS USE SAME CONFIGURATION / OPTION for **cglm** if you have multiple projects.
For instance if you set CGLM_ALL_UNALIGNED in a project then set it in other projects too
SSE and SSE2 Shuffle Option
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
**_mm_shuffle_ps** generates **shufps** instruction even if registers are same.
You can force it to generate **pshufd** instruction by defining
**CGLM_USE_INT_DOMAIN** macro. As default it is not defined.

2
include/cglm/simd/intrin.h
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@@ -32,7 +32,7 @@
#ifdef CGLM_USE_INT_DOMAIN
# define glmm_shuff1(xmm, z, y, x, w) \
_mm_castsi128_ps(_mm_shuffle_epi32(_mm_castps_si128(xmm), \
_MM_SHUFFLE(z, y, x, w)))
_MM_SHUFFLE(z, y, x, w)))
#else
# define glmm_shuff1(xmm, z, y, x, w) \
_mm_shuffle_ps(xmm, xmm, _MM_SHUFFLE(z, y, x, w))

6
include/cglm/simd/sse2/mat4.h
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@@ -168,8 +168,8 @@ glm_mat4_inv_fast_sse2(mat4 mat, mat4 dest) {
r3 = glmm_load(mat[3]); /* p o n m */
x0 = _mm_shuffle_ps(r2, r3, _MM_SHUFFLE(3, 2, 3, 2)); /* p o l k */
x1 = glmm_shuff1(x0, 1, 3, 3, 3); /* l p p p */
x2 = glmm_shuff1(x0, 0, 2, 2, 2); /* k o o o */
x1 = glmm_shuff1(x0, 1, 3, 3, 3); /* l p p p */
x2 = glmm_shuff1(x0, 0, 2, 2, 2); /* k o o o */
x0 = _mm_shuffle_ps(r2, r1, _MM_SHUFFLE(3, 3, 3, 3)); /* h h l l */
x3 = _mm_shuffle_ps(r2, r1, _MM_SHUFFLE(2, 2, 2, 2)); /* g g k k */
@@ -180,7 +180,7 @@ glm_mat4_inv_fast_sse2(mat4 mat, mat4 dest) {
t0 = _mm_sub_ps(_mm_mul_ps(x3, x1), _mm_mul_ps(x2, x0));
x4 = _mm_shuffle_ps(r2, r3, _MM_SHUFFLE(2, 1, 2, 1)); /* o n k j */
x4 = glmm_shuff1(x4, 0, 2, 2, 2); /* j n n n */
x4 = glmm_shuff1(x4, 0, 2, 2, 2); /* j n n n */
x5 = _mm_shuffle_ps(r2, r1, _MM_SHUFFLE(1, 1, 1, 1)); /* f f j j */
/* t1[1] = j * p - n * l;