[Pixman] [PATCH 2/5] ARM: NEON: Bilinear macro template for instruction scheduling
Taekyun Kim
podain77 at gmail.com
Tue Oct 11 06:24:44 PDT 2011
From: Taekyun Kim <tkq.kim at samsung.com>
This macro template takes 6 code blocks.
1. process_last_pixel
2. process_two_pixels
3. process_four_pixels
4. process_pixblock_head
5. process_pixblock_tail
6. process_pixblock_tail_head
process_last_pixel does not need to update horizontal weight. This
is done by the template. two and four code block should update
horizontal weight inside of them. head/tail/tail_head blocks
consist unrolled core loop. You can apply instruction scheduling
to the tail_head blocks.
You can also specify size of the pixel block. Supported size is 4
and 8. If you want to use mask, give BILINEAR_FLAG_USE_MASK flags
to the template, then you can use register MASK. When using d8~d15
registers, give BILINEAR_FLAG_USE_ALL_NEON_REGS to make sure
registers are properly saved on the stack and later restored.
---
pixman/pixman-arm-neon-asm-bilinear.S | 195 +++++++++++++++++++++++++++++++++
1 files changed, 195 insertions(+), 0 deletions(-)
diff --git a/pixman/pixman-arm-neon-asm-bilinear.S b/pixman/pixman-arm-neon-asm-bilinear.S
index c5ba929..784e5df 100644
--- a/pixman/pixman-arm-neon-asm-bilinear.S
+++ b/pixman/pixman-arm-neon-asm-bilinear.S
@@ -773,3 +773,198 @@ generate_bilinear_scanline_func_src_a8_dst \
generate_bilinear_scanline_func_src_a8_dst \
pixman_scaled_bilinear_scanline_8888_8_8888_ADD_asm_neon, \
8888, 8888, add, 2, 28
+
+.set BILINEAR_FLAG_USE_MASK, 1
+.set BILINEAR_FLAG_USE_ALL_NEON_REGS, 2
+
+/*
+ * Main template macro for generating NEON optimized bilinear scanline functions.
+ *
+ * Bilinear scanline generator macro take folling arguments:
+ * fname - name of the function to generate
+ * src_fmt - source color format (8888 or 0565)
+ * dst_fmt - destination color format (8888 or 0565)
+ * src/dst_bpp_shift - (1 << bpp_shift) is the size of src/dst pixel in bytes
+ * process_last_pixel - code block that interpolate one pixel and does not
+ * update horizontal weight
+ * process_two_pixels - code block that interpolate two pixels and update
+ * horizontal weight
+ * process_four_pixels - code block that interpolate four pixels and update
+ * horizontal weight
+ * process_pixblock_head - head part of middle loop
+ * process_pixblock_tail - tail part of middle loop
+ * process_pixblock_tail_head - tail_head of middle loop
+ * pixblock_size - number of pixels processed in a single middle loop
+ * prefetch_distance - prefetch in the source image by that many pixels ahead
+ */
+
+.macro generate_bilinear_scanline_func \
+ fname, \
+ src_fmt, dst_fmt, src_bpp_shift, dst_bpp_shift, \
+ bilinear_process_last_pixel, \
+ bilinear_process_two_pixels, \
+ bilinear_process_four_pixels, \
+ bilinear_process_pixblock_head, \
+ bilinear_process_pixblock_tail, \
+ bilinear_process_pixblock_tail_head, \
+ pixblock_size, \
+ prefetch_distance, \
+ flags
+
+pixman_asm_function fname
+.if pixblock_size == 8
+.elseif pixblock_size == 4
+.else
+ .error unsupported pixblock size
+.endif
+
+.if ((flags) & BILINEAR_FLAG_USE_MASK) == 0
+ OUT .req r0
+ TOP .req r1
+ BOTTOM .req r2
+ WT .req r3
+ WB .req r4
+ X .req r5
+ UX .req r6
+ WIDTH .req ip
+ TMP1 .req r3
+ TMP2 .req r4
+ PF_OFFS .req r7
+ TMP3 .req r8
+ TMP4 .req r9
+ STRIDE .req r2
+
+ mov ip, sp
+ push {r4, r5, r6, r7, r8, r9}
+ mov PF_OFFS, #prefetch_distance
+ ldmia ip, {WB, X, UX, WIDTH}
+.else
+ OUT .req r0
+ MASK .req r1
+ TOP .req r2
+ BOTTOM .req r3
+ WT .req r4
+ WB .req r5
+ X .req r6
+ UX .req r7
+ WIDTH .req ip
+ TMP1 .req r4
+ TMP2 .req r5
+ PF_OFFS .req r8
+ TMP3 .req r9
+ TMP4 .req r10
+ STRIDE .req r3
+
+ mov ip, sp
+ push {r4, r5, r6, r7, r8, r9, r10, ip}
+ mov PF_OFFS, #prefetch_distance
+ ldmia ip, {WT, WB, X, UX, WIDTH}
+.endif
+
+ mul PF_OFFS, PF_OFFS, UX
+
+.if ((flags) & BILINEAR_FLAG_USE_ALL_NEON_REGS) != 0
+ vpush {d8-d15}
+.endif
+
+ sub STRIDE, BOTTOM, TOP
+ .unreq BOTTOM
+
+ cmp WIDTH, #0
+ ble 3f
+
+ vdup.u16 q12, X
+ vdup.u16 q13, UX
+ vdup.u8 d28, WT
+ vdup.u8 d29, WB
+ vadd.u16 d25, d25, d26
+
+ /* ensure good destination alignment */
+ cmp WIDTH, #1
+ blt 0f
+ tst OUT, #(1 << dst_bpp_shift)
+ beq 0f
+ vshr.u16 q15, q12, #8
+ vadd.u16 q12, q12, q13
+ bilinear_process_last_pixel
+ sub WIDTH, WIDTH, #1
+0:
+ vadd.u16 q13, q13, q13
+ vshr.u16 q15, q12, #8
+ vadd.u16 q12, q12, q13
+
+ cmp WIDTH, #2
+ blt 0f
+ tst OUT, #(1 << (dst_bpp_shift + 1))
+ beq 0f
+ bilinear_process_two_pixels
+ sub WIDTH, WIDTH, #2
+0:
+.if pixblock_size == 8
+ cmp WIDTH, #4
+ blt 0f
+ tst OUT, #(1 << (dst_bpp_shift + 2))
+ beq 0f
+ bilinear_process_four_pixels
+ sub WIDTH, WIDTH, #4
+0:
+.endif
+ subs WIDTH, WIDTH, #pixblock_size
+ blt 1f
+ mov PF_OFFS, PF_OFFS, asr #(16 - src_bpp_shift)
+ bilinear_process_pixblock_head
+ subs WIDTH, WIDTH, #pixblock_size
+ blt 5f
+0:
+ bilinear_process_pixblock_tail_head
+ subs WIDTH, WIDTH, #pixblock_size
+ bge 0b
+5:
+ bilinear_process_pixblock_tail
+1:
+.if pixblock_size == 8
+ tst WIDTH, #4
+ beq 2f
+ bilinear_process_four_pixels
+2:
+.endif
+ /* handle the remaining trailing pixels */
+ tst WIDTH, #2
+ beq 2f
+ bilinear_process_two_pixels
+2:
+ tst WIDTH, #1
+ beq 3f
+ bilinear_process_last_pixel
+3:
+.if ((flags) & BILINEAR_FLAG_USE_ALL_NEON_REGS) != 0
+ vpop {d8-d15}
+.endif
+
+.if ((flags) & BILINEAR_FLAG_USE_MASK) == 0
+ pop {r4, r5, r6, r7, r8, r9}
+.else
+ pop {r4, r5, r6, r7, r8, r9, r10, ip}
+.endif
+ bx lr
+
+ .unreq OUT
+ .unreq TOP
+ .unreq WT
+ .unreq WB
+ .unreq X
+ .unreq UX
+ .unreq WIDTH
+ .unreq TMP1
+ .unreq TMP2
+ .unreq PF_OFFS
+ .unreq TMP3
+ .unreq TMP4
+ .unreq STRIDE
+.if ((flags) & BILINEAR_FLAG_USE_MASK) != 0
+ .unreq MASK
+.endif
+
+.endfunc
+
+.endm
--
1.7.1
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