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implement ARM64 ScaleRowDown4 and ScaleRowDown4Box

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

Review URL: https://webrtc-codereview.appspot.com/21279004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1068 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
zhongwei.yao@arm.com 2014-08-28 06:43:18 +00:00
parent 3389f8efa4
commit 4d5c3f3498
2 changed files with 17 additions and 20 deletions
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2
include/libyuv/scale_row.h
View File

@ -54,7 +54,7 @@ extern "C" {
#elif !defined(LIBYUV_DISABLE_NEON) && !defined(__native_client__) && \
(defined(__aarch64__) || defined(LIBYUV_NEON))
#define HAS_SCALEROWDOWN2_NEON
/* #define HAS_SCALEROWDOWN4_NEON */
#define HAS_SCALEROWDOWN4_NEON
/* #define HAS_SCALEROWDOWN34_NEON */
/* #define HAS_SCALEROWDOWN38_NEON */
/* #define HAS_SCALEARGBROWDOWNEVEN_NEON */

35
source/scale_neon64.cc
View File

@ -75,19 +75,18 @@ void ScaleRowDown2Box_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
void ScaleRowDown4_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
asm volatile (
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld4.8 {d0, d1, d2, d3}, [%0]! \n" // src line 0
"subs %2, %2, #8 \n" // 8 processed per loop
"ld4 {v0.8b-3.8b}, [%0], #32 \n" // src line 0
"subs %2, %2, #8 \n" // 8 processed per loop
MEMACCESS(1)
"vst1.8 {d2}, [%1]! \n"
"st1 {v2.8b}, [%1], #8 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
"+r"(dst_width) // %2
:
: "q0", "q1", "memory", "cc"
: "v0", "v1", "v2", "v3", "memory", "cc"
);
}
#endif //HAS_SCALEROWDOWN4_NEON
@ -99,26 +98,24 @@ void ScaleRowDown4Box_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
const uint8* src_ptr2 = src_ptr + src_stride * 2;
const uint8* src_ptr3 = src_ptr + src_stride * 3;
asm volatile (
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld1.8 {q0}, [%0]! \n" // load up 16x4
"ld1 {v0.16b}, [%0], #16 \n" // load up 16x4
MEMACCESS(3)
"vld1.8 {q1}, [%3]! \n"
"ld1 {v1.16b}, [%3], #16 \n"
MEMACCESS(4)
"vld1.8 {q2}, [%4]! \n"
"ld1 {v2.16b}, [%4], #16 \n"
MEMACCESS(5)
"vld1.8 {q3}, [%5]! \n"
"ld1 {v3.16b}, [%5], #16 \n"
"subs %2, %2, #4 \n"
"vpaddl.u8 q0, q0 \n"
"vpadal.u8 q0, q1 \n"
"vpadal.u8 q0, q2 \n"
"vpadal.u8 q0, q3 \n"
"vpaddl.u16 q0, q0 \n"
"vrshrn.u32 d0, q0, #4 \n" // divide by 16 w/rounding
"vmovn.u16 d0, q0 \n"
"uaddlp v0.8h, v0.16b \n"
"uadalp v0.8h, v1.16b \n"
"uadalp v0.8h, v2.16b \n"
"uadalp v0.8h, v3.16b \n"
"addp v0.8h, v0.8h, v0.8h \n"
"rshrn v0.8b, v0.8h, #4 \n" // divide by 16 w/rounding
MEMACCESS(1)
"vst1.32 {d0[0]}, [%1]! \n"
"st1 {v0.s}[0], [%1], #4 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst_ptr), // %1
@ -127,7 +124,7 @@ asm volatile (
"+r"(src_ptr2), // %4
"+r"(src_ptr3) // %5
:
: "q0", "q1", "q2", "q3", "memory", "cc"
: "v0", "v1", "v2", "v3", "memory", "cc"
);
}
#endif //HAS_SCALEROWDOWN4_NEON