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SVE2: Improves SVE2 8888 swizzling performance and important fixes (#15662)

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* SVE2 was actually disabled in fdfbbce, this issue is fixed
  - The macro __ARM_FEATURE_SVE  is only defined when the compilation target is set as -march=armv8-m+sve2
* Improves 8888 alpha-blending performance
  - Now, in In-Order AArch64 processors, e.g. A520, SVE2 is better than NEON with the 128bit vector width
  - For Out-of-order processors, NEON is still better than SVE2 (We could improve this in the future), the performance is improved from 3.0 to 3.6.
* The 8888 -> RGB565 performance is also improved (from 7.4 to 9.3)
This commit is contained in:
Gabriel Wang 2026-05-26 22:57:44 +08:00 • committed by GitHub
parent d5438360d2
commit f2dba2626e
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GPG key ID: B5690EEEBB952194
4 changed files with 62 additions and 22 deletions
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50
src/video/arm/SDL_sve2_extension.h
View file

@ -19,10 +19,33 @@
3. This notice may not be removed or altered from any source distribution.
*/
/*
* IMPORTANT: Please do NOT include this header file directly or indirectly
* outside the src/video/arm folder.
*
*/
#if !defined(SDL_SVE2_EXTENSION_H) //&& (defined(__ARM_FEATURE_SVE2) && __ARM_FEATURE_SVE2)
#define SDL_SVE2_EXTENSION_H
#include "SDL_sve2_util.h"
/*
* NOTE: Some Android builds didn't attach '-march=armv8-a+sve2' to
* SDL_sve2_*.c and hence the macro __ARM_FEATURE_SVE is not
* defined by the compiler. This might not be a problem as the
* SDL_TARGETING("arch=armv8-a+sve2") enables the feature for
* individual functions, until some version of compilers
* provides arm_sve.h raising errors then __ARM_FEATURE_SVE
* is not defined. Although it should be avoided, as a
* workaround, we have to define the __ARM_FEATURE_SVE here as
* an ugly hack.
*/
#ifdef SDL_PLATFORM_ANDROID
#ifndef __ARM_FEATURE_SVE
#define __ARM_FEATURE_SVE 1
#endif
#endif
#include <arm_sve.h>
#include <stdint.h>
@ -907,7 +930,8 @@ static inline svuint16_t sdl_sve_chn_blend_with_mask(svuint16_t vSource,
svuint16_t vMask)
{
// vTarget = vSource * vMask + vTarget * (255 - vMask);
svuint16_t vTemp0 = svmul_u16_m(svptrue_b16(), vSource, vMask);
svuint16_t vTemp0 = svdup_u16(1);
vTemp0 = svmla_u16_m(svptrue_b16(), vTemp0, vSource, vMask);
vTemp0 = svmla_u16_m(svptrue_b16(),
vTemp0,
vTarget,
@ -915,17 +939,13 @@ static inline svuint16_t sdl_sve_chn_blend_with_mask(svuint16_t vSource,
svdup_u16(255),
vMask));
vTemp0 = svadd_n_u16_m(svptrue_b16(), vTemp0, 1);
svuint16_t vTemp1 = svlsr_n_u16_m(svptrue_b16(), vTemp0, 8);
/* x += x >> 8 */
vTemp0 = svadd_u16_m(svptrue_b16(),
vTemp0,
vTemp1);
return svlsr_n_u16_m(svptrue_b16(), vTemp0, 8); // vTarget >> 8;
return svreinterpret_u16_u8(
svaddhnb_u16(vTemp0,
svlsr_n_u16_m(svptrue_b16(),
vTemp0,
8)));
}
/*! \note the Element range of vMask is [0, 0xFF]
*/
SDL_TARGETING("arch=armv8-a+sve2")
@ -968,15 +988,15 @@ static inline svuint16_t sdl_sve_chn_blend_with_opacity(svuint16_t vSource,
*/
SDL_TARGETING("arch=armv8-a+sve2")
static inline svuint16_t sdl_sve_chn_blend_with_opacity_fast(svuint16_t vSource,
svuint16_t vTarget,
uint16_t hwOpacity)
svuint16_t vTarget,
uint16_t hwOpacity)
{
// vTarget = vSource * vMask + vTarget * (255 - vMask);
svuint16_t vTemp0 = svmul_n_u16_m(svptrue_b16(), vSource, hwOpacity);
vTemp0 = svmla_n_u16_m(svptrue_b16(),
vTemp0,
vTarget,
256 - hwOpacity);
vTemp0,
vTarget,
256 - hwOpacity);
return svlsr_n_u16_m(svptrue_b16(), vTemp0, 8); // vTarget >> 8;
}

6
src/video/arm/SDL_sve2_swizzle.h
View file

@ -19,6 +19,12 @@
3. This notice may not be removed or altered from any source distribution.
*/
/*
* IMPORTANT: Please do NOT include this header file directly or indirectly
* outside the src/video/arm folder.
*
*/
#if !defined(SD_SVE2_SWIZZLE_H) //&& (defined(__ARM_FEATURE_SVE2) && __ARM_FEATURE_SVE2)
#define SD_SVE2_SWIZZLE_H