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implement ScaleARGBRowDown2 && ScaleARGBRowDown2Box

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

Review URL: https://webrtc-codereview.appspot.com/17199004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1063 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
zhongwei.yao@arm.com 2014-08-26 02:45:14 +00:00
parent 6fb3ed37f5
commit 15d1af1574
2 changed files with 36 additions and 42 deletions
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2
include/libyuv/scale_row.h
View File

@ -58,7 +58,7 @@ extern "C" {
/* #define HAS_SCALEROWDOWN34_NEON */
/* #define HAS_SCALEROWDOWN38_NEON */
/* #define HAS_SCALEARGBROWDOWNEVEN_NEON */
/* #define HAS_SCALEARGBROWDOWN2_NEON */
#define HAS_SCALEARGBROWDOWN2_NEON
#endif
// The following are available on Mips platforms:

76
source/scale_neon64.cc
View File

@ -638,24 +638,23 @@ void ScaleFilterRows_NEON(uint8* dst_ptr,
void ScaleARGBRowDown2_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
MEMACCESS(0)
"vld2.32 {q0, q1}, [%0]! \n"
MEMACCESS(0)
"vld2.32 {q2, q3}, [%0]! \n"
MEMACCESS (0)
"ld2 {v0.4s, v1.4s}, [%0], #32 \n"
MEMACCESS (0)
"ld2 {v2.4s, v3.4s}, [%0], #32 \n"
"subs %2, %2, #8 \n" // 8 processed per loop
MEMACCESS(1)
"vst1.8 {q1}, [%1]! \n" // store odd pixels
MEMACCESS(1)
"vst1.8 {q3}, [%1]! \n"
MEMACCESS (1)
"st1 {v1.16b}, [%1], #16 \n" // store odd pixels
MEMACCESS (1)
"st1 {v3.16b}, [%1], #16 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(dst), // %1
"+r"(dst_width) // %2
: "+r" (src_ptr), // %0
"+r" (dst), // %1
"+r" (dst_width) // %2
:
: "memory", "cc", "q0", "q1", "q2", "q3" // Clobber List
: "memory", "cc", "v0", "v1", "v2", "v3" // Clobber List
);
}
#endif //HAS_SCALEARGBROWDOWN2_NEON
@ -666,38 +665,33 @@ void ScaleARGBRowDown2Box_NEON(const uint8* src_ptr, ptrdiff_t src_stride,
asm volatile (
// change the stride to row 2 pointer
"add %1, %1, %0 \n"
".p2align 2 \n"
"1: \n"
MEMACCESS(0)
"vld4.8 {d0, d2, d4, d6}, [%0]! \n" // load 8 ARGB pixels.
MEMACCESS(0)
"vld4.8 {d1, d3, d5, d7}, [%0]! \n" // load next 8 ARGB pixels.
MEMACCESS (0)
"ld4 {v0.16b - v3.16b}, [%0], #64 \n" // load 8 ARGB pixels.
"subs %3, %3, #8 \n" // 8 processed per loop.
"vpaddl.u8 q0, q0 \n" // B 16 bytes -> 8 shorts.
"vpaddl.u8 q1, q1 \n" // G 16 bytes -> 8 shorts.
"vpaddl.u8 q2, q2 \n" // R 16 bytes -> 8 shorts.
"vpaddl.u8 q3, q3 \n" // A 16 bytes -> 8 shorts.
MEMACCESS(1)
"vld4.8 {d16, d18, d20, d22}, [%1]! \n" // load 8 more ARGB pixels.
MEMACCESS(1)
"vld4.8 {d17, d19, d21, d23}, [%1]! \n" // load last 8 ARGB pixels.
"vpadal.u8 q0, q8 \n" // B 16 bytes -> 8 shorts.
"vpadal.u8 q1, q9 \n" // G 16 bytes -> 8 shorts.
"vpadal.u8 q2, q10 \n" // R 16 bytes -> 8 shorts.
"vpadal.u8 q3, q11 \n" // A 16 bytes -> 8 shorts.
"vrshrn.u16 d0, q0, #2 \n" // downshift, round and pack
"vrshrn.u16 d1, q1, #2 \n"
"vrshrn.u16 d2, q2, #2 \n"
"vrshrn.u16 d3, q3, #2 \n"
MEMACCESS(2)
"vst4.8 {d0, d1, d2, d3}, [%2]! \n"
"uaddlp v0.8h, v0.16b \n" // B 16 bytes -> 8 shorts.
"uaddlp v1.8h, v1.16b \n" // G 16 bytes -> 8 shorts.
"uaddlp v2.8h, v2.16b \n" // R 16 bytes -> 8 shorts.
"uaddlp v3.8h, v3.16b \n" // A 16 bytes -> 8 shorts.
MEMACCESS (1)
"ld4 {v16.16b - v19.16b}, [%1], #64 \n" // load 8 more ARGB pixels.
"uadalp v0.8h, v16.16b \n" // B 16 bytes -> 8 shorts.
"uadalp v1.8h, v17.16b \n" // G 16 bytes -> 8 shorts.
"uadalp v2.8h, v18.16b \n" // R 16 bytes -> 8 shorts.
"uadalp v3.8h, v19.16b \n" // A 16 bytes -> 8 shorts.
"rshrn v0.8b, v0.8h, #2 \n" // downshift, round and pack
"rshrn v1.8b, v1.8h, #2 \n"
"rshrn v2.8b, v2.8h, #2 \n"
"rshrn v3.8b, v3.8h, #2 \n"
MEMACCESS (2)
"st4 {v0.8b - v3.8b}, [%2], #32 \n"
"bgt 1b \n"
: "+r"(src_ptr), // %0
"+r"(src_stride), // %1
"+r"(dst), // %2
"+r"(dst_width) // %3
: "+r" (src_ptr), // %0
"+r" (src_stride), // %1
"+r" (dst), // %2
"+r" (dst_width) // %3
:
: "memory", "cc", "q0", "q1", "q2", "q3", "q8", "q9", "q10", "q11"
: "memory", "cc", "v0", "v1", "v2", "v3", "v16", "v17", "v18", "v19"
);
}
#endif //HAS_SCALEARGBROWDOWN2_NEON