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implement ScaleRowDown2_NEON && ScaleRowDown2Box_NEON

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TESTED=libyuv_unit_test
BUG=319
R=fbarchard@chromium.org, fbarchard@google.com

Review URL: https://webrtc-codereview.appspot.com/15269004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1064 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
zhongwei.yao@arm.com 2014-08-26 02:50:41 +00:00
parent 15d1af1574
commit 298dbf2dc3
2 changed files with 16 additions and 18 deletions
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2
include/libyuv/scale_row.h
View File

@ -53,7 +53,7 @@ extern "C" {
#define HAS_SCALEARGBROWDOWN2_NEON
#elif !defined(LIBYUV_DISABLE_NEON) && !defined(__native_client__) && \
(defined(__aarch64__) || defined(LIBYUV_NEON))
/* #define HAS_SCALEROWDOWN2_NEON */
#define HAS_SCALEROWDOWN2_NEON
/* #define HAS_SCALEROWDOWN4_NEON */
/* #define HAS_SCALEROWDOWN34_NEON */
/* #define HAS_SCALEROWDOWN38_NEON */

32
source/scale_neon64.cc
View File

@ -22,20 +22,19 @@ extern "C" {
void ScaleRowDown2_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst, int dst_width) {
asm volatile (
".p2align 2 \n"
"1: \n"
// load even pixels into q0, odd into q1
// load even pixels into v0, odd into v1
MEMACCESS(0)
"vld2.8 {q0, q1}, [%0]! \n"
"ld2 {v0.16b, v1.16b}, [%0], #32 \n"
"subs %2, %2, #16 \n" // 16 processed per loop
MEMACCESS(1)
"vst1.8 {q1}, [%1]! \n" // store odd pixels
"st1 {v1.16b}, [%1], #16 \n" // store odd pixels
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst), // %1
"+r"(dst_width) // %2
:
: "q0", "q1" // Clobber List
: "v0", "v1" // Clobber List
);
}
#endif //HAS_SCALEROWDOWN2_NEON
@ -46,29 +45,28 @@ void ScaleRowDown2Box_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst, int dst_width) {
asm volatile (
// change the stride to row 2 pointer
"add %1, %0 \n"
".p2align 2 \n"
"add %1, %1, %0 \n"
"1: \n"
MEMACCESS(0)
"vld1.8 {q0, q1}, [%0]! \n" // load row 1 and post inc
"ld1 {v0.16b, v1.16b}, [%0], #32 \n" // load row 1 and post inc
MEMACCESS(1)
"vld1.8 {q2, q3}, [%1]! \n" // load row 2 and post inc
"ld1 {v2.16b, v3.16b}, [%1], #32 \n" // load row 2 and post inc
"subs %3, %3, #16 \n" // 16 processed per loop
"vpaddl.u8 q0, q0 \n" // row 1 add adjacent
"vpaddl.u8 q1, q1 \n"
"vpadal.u8 q0, q2 \n" // row 2 add adjacent + row1
"vpadal.u8 q1, q3 \n"
"vrshrn.u16 d0, q0, #2 \n" // downshift, round and pack
"vrshrn.u16 d1, q1, #2 \n"
"uaddlp v0.8h, v0.16b \n" // row 1 add adjacent
"uaddlp v1.8h, v1.16b \n"
"uadalp v0.8h, v2.16b \n" // row 2 add adjacent + row1
"uadalp v1.8h, v3.16b \n"
"rshrn v0.8b, v0.8h, #2 \n" // downshift, round and pack
"rshrn2 v0.16b, v1.8h, #2 \n"
MEMACCESS(2)
"vst1.8 {q0}, [%2]! \n"
"st1 {v0.16b}, [%2], #16 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(src_stride), // %1
"+r"(dst), // %2
"+r"(dst_width) // %3
:
: "q0", "q1", "q2", "q3" // Clobber List
: "v0", "v1", "v2", "v3" // Clobber List
);
}
#endif //HAS_SCALEROWDOWN2_NEON