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Unified Diff: src/opts/SkBlitRow_opts_SSE4_x64_asm.S

Issue 874863002: SSE4 opaque blend using intrinsics instead of assembly. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: rebase for gyp changes Created 5 years, 11 months ago
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Index: src/opts/SkBlitRow_opts_SSE4_x64_asm.S
diff --git a/src/opts/SkBlitRow_opts_SSE4_x64_asm.S b/src/opts/SkBlitRow_opts_SSE4_x64_asm.S
deleted file mode 100644
index 9a754a635bd7794b72224e9c0be649e01bc91883..0000000000000000000000000000000000000000
--- a/src/opts/SkBlitRow_opts_SSE4_x64_asm.S
+++ /dev/null
@@ -1,472 +0,0 @@
-/*
- * Copyright 2014 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifdef CRBUG_399842_FIXED
-
-#if defined(__clang__) || (defined(__GNUC__) && !defined(SK_BUILD_FOR_MAC))
-
-#define EXTRACT_ALPHA(var1, var2) \
- movdqa %var1, %var2; /* Clone source pixels to extract alpha */\
- psrlw $8, %var2; /* Discard red and blue, leaving alpha and green */\
- pshufhw $0xF5, %var2, %var2; /* Repeat alpha for scaling (high) */\
- movdqa %xmm6, %xmm4; \
- pshuflw $0xF5, %var2, %var2; /* Repeat alpha for scaling (low) */\
- movdqa %xmm5, %xmm3; \
- psubw %var2, %xmm4 /* Finalize alpha calculations */
-
-#define SCALE_PIXELS \
- psllw $8, %xmm5; /* Filter out red and blue components */\
- pmulhuw %xmm4, %xmm5; /* Scale red and blue */\
- psrlw $8, %xmm3; /* Filter out alpha and green components */\
- pmullw %xmm4, %xmm3 /* Scale alpha and green */
-
-
-/*
- * void S32A_Opaque_BlitRow32_SSE4(SkPMColor* SK_RESTRICT dst,
- * const SkPMColor* SK_RESTRICT src,
- * int count, U8CPU alpha)
- *
- * This function is divided into six blocks: initialization, blit 4-15 pixels,
- * blit 0-3 pixels, align destination for 16+ pixel blits,
- * blit 16+ pixels with source unaligned, blit 16+ pixels with source aligned.
- * There are some code reuse between the blocks.
- *
- * The primary optimization comes from checking the source pixels' alpha value.
- * If the alpha is zero, the pixel can be skipped entirely.
- * If the alpha is fully opaque, the pixel can be copied directly to the destination.
- * According to collected statistics, these two cases are the most common.
- * The main loop(s) uses pre-loading and unrolling in an attempt to reduce the
- * memory latency worse-case.
- */
-
-#ifdef __clang__
- .text
-#else
- .section .text.sse4.2,"ax",@progbits
- .type S32A_Opaque_BlitRow32_SSE4_asm, @function
-#endif
- .p2align 4
-#if defined(SK_BUILD_FOR_MAC)
- .global _S32A_Opaque_BlitRow32_SSE4_asm
- .private_extern _S32A_Opaque_BlitRow32_SSE4_asm
-_S32A_Opaque_BlitRow32_SSE4_asm:
-#else
- .global S32A_Opaque_BlitRow32_SSE4_asm
- .hidden S32A_Opaque_BlitRow32_SSE4_asm
-S32A_Opaque_BlitRow32_SSE4_asm:
-#endif
- .cfi_startproc
- prefetcht0 (%rsi)
- movl %edx, %ecx // Pixel count
- movq %rdi, %rdx // Destination pointer
- movq %rsi, %rax // Source pointer
-
- // Setup SSE constants
- movdqa .LAlphaCheckMask(%rip), %xmm7 // 0xFF000000 mask to check alpha
- movdqa .LInverseAlphaCalc(%rip), %xmm6// 16-bit 256 to calculate inv. alpha
- movdqa .LResultMergeMask(%rip), %xmm0 // 0x00FF00FF mask (Must be in xmm0 because of pblendvb)
-
- subl $4, %ecx // Check if we have only 0-3 pixels
- js .LReallySmall
- cmpl $11, %ecx // Do we have enough pixels to run the main loop?
- ja .LBigBlit
-
- // Handle small blits (4-15 pixels)
- ////////////////////////////////////////////////////////////////////////////////
- xorq %rdi, %rdi // Reset offset to zero
-
-.LSmallLoop:
- lddqu (%rax, %rdi), %xmm1 // Load four source pixels
- ptest %xmm7, %xmm1 // Check if all alphas are zero or opaque
- ja .LSmallAlphaNotOpaqueOrZero
- jz .LSmallAlphaZero
- movdqu %xmm1, (%rdx, %rdi) // Store four destination pixels
-.LSmallAlphaZero:
- addq $16, %rdi
- subl $4, %ecx // Check if there are four additional pixels, at least
- jns .LSmallLoop
- jmp .LSmallRemaining
-
- // Handle mixed alphas (calculate and scale)
- .p2align 4
-.LSmallAlphaNotOpaqueOrZero:
- lddqu (%rdx, %rdi), %xmm5 // Load four destination pixels
- EXTRACT_ALPHA(xmm1, xmm2) // Extract and clone alpha value
- SCALE_PIXELS // Scale pixels using alpha
-
- addq $16, %rdi
- subl $4, %ecx // Check if there are four additional pixels, at least
- pblendvb %xmm5, %xmm3 // Mask in %xmm0, implicitly
- paddb %xmm3, %xmm1 // Add source and destination pixels together
- movdqu %xmm1, -16(%rdx, %rdi) // Store four destination pixels
- jns .LSmallLoop
-
- // Handle the last 0-3 pixels (also used by the main loops)
-.LSmallRemaining:
- cmpl $-4, %ecx // Check if we are done
- je .LSmallExit
- sall $2, %ecx // Calculate offset for last pixels
- movslq %ecx, %rcx
- addq %rcx, %rdi
-
- lddqu (%rax, %rdi), %xmm1 // Load last four source pixels (overlapping)
- ptest %xmm7, %xmm1 // Check if all alphas are zero or opaque
- jc .LSmallRemainingStoreAll// If all alphas are opaque, just store (overlapping)
- jz .LSmallExit // If all alphas are zero, skip the pixels completely
-
- // Handle mixed alphas (calculate and scale)
- lddqu (%rdx, %rdi), %xmm5 // Load last four destination pixels (overlapping)
- EXTRACT_ALPHA(xmm1, xmm2) // Extract and clone alpha value
-
- psllw $8, %xmm3 // Filter out red and blue components
- pmulhuw %xmm4, %xmm3 // Scale red and blue
- movdqa %xmm5, %xmm2
- psrlw $8, %xmm2 // Filter out alpha and green components
- pmullw %xmm4, %xmm2 // Scale alpha and green
-
- cmpl $-8, %ecx // Check how many pixels should be written
- pblendvb %xmm3, %xmm2 // Combine results (mask in %xmm0, implicitly)
- paddb %xmm2, %xmm1 // Add source and destination pixels together
- jb .LSmallPixelsLeft1
- ja .LSmallPixelsLeft3 // To avoid double-blending the overlapping pixels...
- pblendw $0xF0, %xmm1, %xmm5 // Merge only the final two pixels to the destination
- movdqu %xmm5, (%rdx, %rdi) // Store last two destination pixels
-.LSmallExit:
- ret
-
-.LSmallPixelsLeft1:
- pblendw $0xC0, %xmm1, %xmm5 // Merge only the final pixel to the destination
- movdqu %xmm5, (%rdx, %rdi) // Store last destination pixel
- ret
-
-.LSmallPixelsLeft3:
- pblendw $0xFC, %xmm1, %xmm5 // Merge only the final three pixels to the destination
- movdqu %xmm5, (%rdx, %rdi) // Store last three destination pixels
- ret
-
-.LSmallRemainingStoreAll:
- movdqu %xmm1, (%rdx, %rdi) // Store last destination pixels (overwrite)
- ret
-
- // Handle really small blits (0-3 pixels)
- ////////////////////////////////////////////////////////////////////////////////
-.LReallySmall:
- addl $4, %ecx
- jle .LReallySmallExit
- pcmpeqd %xmm1, %xmm1
- cmpl $2, %ecx // Check how many pixels should be read
- pinsrd $0x0, (%rax), %xmm1 // Load one source pixel
- pinsrd $0x0, (%rdx), %xmm5 // Load one destination pixel
- jb .LReallySmallCalc
- pinsrd $0x1, 4(%rax), %xmm1 // Load second source pixel
- pinsrd $0x1, 4(%rdx), %xmm5 // Load second destination pixel
- je .LReallySmallCalc
- pinsrd $0x2, 8(%rax), %xmm1 // Load third source pixel
- pinsrd $0x2, 8(%rdx), %xmm5 // Load third destination pixel
-
-.LReallySmallCalc:
- ptest %xmm7, %xmm1 // Check if all alphas are opaque
- jc .LReallySmallStore // If all alphas are opaque, just store
-
- // Handle mixed alphas (calculate and scale)
- EXTRACT_ALPHA(xmm1, xmm2) // Extract and clone alpha value
-
- pand %xmm0, %xmm5 // Filter out red and blue components
- pmullw %xmm4, %xmm5 // Scale red and blue
- psrlw $8, %xmm3 // Filter out alpha and green components
- pmullw %xmm4, %xmm3 // Scale alpha and green
-
- psrlw $8, %xmm5 // Combine results
- pblendvb %xmm5, %xmm3 // Mask in %xmm0, implicitly
- paddb %xmm3, %xmm1 // Add source and destination pixels together
-
-.LReallySmallStore:
- cmpl $2, %ecx // Check how many pixels should be written
- pextrd $0x0, %xmm1, (%rdx) // Store one destination pixel
- jb .LReallySmallExit
- pextrd $0x1, %xmm1, 4(%rdx) // Store second destination pixel
- je .LReallySmallExit
- pextrd $0x2, %xmm1, 8(%rdx) // Store third destination pixel
-.LReallySmallExit:
- ret
-
- // Handle bigger blit operations (16+ pixels)
- ////////////////////////////////////////////////////////////////////////////////
- .p2align 4
-.LBigBlit:
- // Align destination?
- testl $0xF, %edx
- lddqu (%rax), %xmm1 // Pre-load four source pixels
- jz .LAligned
-
- movq %rdx, %rdi // Calculate alignment of destination pointer
- negq %rdi
- andl $0xF, %edi
-
- // Handle 1-3 pixels to align destination
- ptest %xmm7, %xmm1 // Check if all alphas are zero or opaque
- jz .LAlignDone // If all alphas are zero, just skip
- lddqu (%rdx), %xmm5 // Load four destination pixels
- jc .LAlignStore // If all alphas are opaque, just store
-
- // Handle mixed alphas (calculate and scale)
- EXTRACT_ALPHA(xmm1, xmm2) // Extract and clone alpha value
-
- psllw $8, %xmm3 // Filter out red and blue components
- pmulhuw %xmm4, %xmm3 // Scale red and blue
- movdqa %xmm5, %xmm2
- psrlw $8, %xmm2 // Filter out alpha and green components
- pmullw %xmm4, %xmm2 // Scale alpha and green
-
- pblendvb %xmm3, %xmm2 // Combine results (mask in %xmm0, implicitly)
- paddb %xmm2, %xmm1 // Add source and destination pixels together
-
-.LAlignStore:
- cmpl $8, %edi // Check how many pixels should be written
- jb .LAlignPixelsLeft1
- ja .LAlignPixelsLeft3
- pblendw $0x0F, %xmm1, %xmm5 // Blend two pixels
- jmp .LAlignStorePixels
-
-.LAlignPixelsLeft1:
- pblendw $0x03, %xmm1, %xmm5 // Blend one pixel
- jmp .LAlignStorePixels
-
-.LAlignPixelsLeft3:
- pblendw $0x3F, %xmm1, %xmm5 // Blend three pixels
-
-.LAlignStorePixels:
- movdqu %xmm5, (%rdx) // Store destination pixels
-
-.LAlignDone:
- addq %rdi, %rax // Adjust pointers and pixel count
- addq %rdi, %rdx
- shrq $2, %rdi
- lddqu (%rax), %xmm1 // Pre-load new source pixels (after alignment)
- subl %edi, %ecx
-
-.LAligned: // Destination is guaranteed to be 16 byte aligned
- xorq %rdi, %rdi // Reset offset to zero
- subl $8, %ecx // Decrease counter (Reserve four pixels for the cleanup)
- testl $0xF, %eax // Check alignment of source pointer
- jz .LAlignedLoop
-
- // Source not aligned to destination
- ////////////////////////////////////////////////////////////////////////////////
- .p2align 4
-.LUnalignedLoop: // Main loop for unaligned, handles eight pixels per iteration
- ptest %xmm7, %xmm1 // Check if all alphas are zero or opaque
- ja .LAlphaNotOpaqueOrZero00
- lddqu 16(%rax, %rdi), %xmm2 // Pre-load four source pixels
- jz .LAlphaZero00
- movdqa %xmm1, (%rdx, %rdi) // Store four destination pixels
-
-.LAlphaZero00:
- ptest %xmm7, %xmm2 // Check if all alphas are zero or opaque
- ja .LAlphaNotOpaqueOrZero01
- lddqu 32(%rax, %rdi), %xmm1 // Pre-load four source pixels
- jz .LAlphaZero01
- movdqa %xmm2, 16(%rdx, %rdi) // Store four destination pixels
-
-.LAlphaZero01:
- addq $32, %rdi // Adjust offset and pixel count
- subl $8, %ecx
- jae .LUnalignedLoop
- addl $8, %ecx // Adjust pixel count
- jmp .LLoopCleanup0
-
- .p2align 4
-.LAlphaNotOpaqueOrZero00:
- movdqa (%rdx, %rdi), %xmm5 // Load four destination pixels
- EXTRACT_ALPHA(xmm1, xmm2) // Extract and clone alpha value
- SCALE_PIXELS // Scale pixels using alpha
-
- lddqu 16(%rax, %rdi), %xmm2 // Pre-load four source pixels
- pblendvb %xmm5, %xmm3 // Combine results (mask in %xmm0, implicitly)
- paddb %xmm3, %xmm1 // Add source and destination pixels together
- movdqa %xmm1, (%rdx, %rdi) // Store four destination pixels
-
- // Handle next four pixels
- ptest %xmm7, %xmm2 // Check if all alphas are zero or opaque
- ja .LAlphaNotOpaqueOrZero01
- lddqu 32(%rax, %rdi), %xmm1 // Pre-load four source pixels
- jz .LAlphaZero02
- movdqa %xmm2, 16(%rdx, %rdi) // Store four destination pixels
-.LAlphaZero02:
- addq $32, %rdi // Adjust offset and pixel count
- subl $8, %ecx
- jae .LUnalignedLoop
- addl $8, %ecx // Adjust pixel count
- jmp .LLoopCleanup0
-
- .p2align 4
-.LAlphaNotOpaqueOrZero01:
- movdqa 16(%rdx, %rdi), %xmm5 // Load four destination pixels
- EXTRACT_ALPHA(xmm2, xmm1) // Extract and clone alpha value
- SCALE_PIXELS // Scale pixels using alpha
-
- lddqu 32(%rax, %rdi), %xmm1 // Pre-load four source pixels
- addq $32, %rdi
- pblendvb %xmm5, %xmm3 // Combine results (mask in %xmm0, implicitly)
- paddb %xmm3, %xmm2 // Add source and destination pixels together
- subl $8, %ecx
- movdqa %xmm2, -16(%rdx, %rdi) // Store four destination pixels
- jae .LUnalignedLoop
- addl $8, %ecx // Adjust pixel count
-
- // Cleanup - handle pending pixels from loop
-.LLoopCleanup0:
- ptest %xmm7, %xmm1 // Check if all alphas are zero or opaque
- ja .LAlphaNotOpaqueOrZero02
- jz .LAlphaZero03
- movdqa %xmm1, (%rdx, %rdi) // Store four destination pixels
-.LAlphaZero03:
- addq $16, %rdi
- subl $4, %ecx
- js .LSmallRemaining // Reuse code from small loop
-
-.LRemain0:
- lddqu (%rax, %rdi), %xmm1 // Load four source pixels
- ptest %xmm7, %xmm1 // Check if all alphas are zero or opaque
- ja .LAlphaNotOpaqueOrZero02
- jz .LAlphaZero04
- movdqa %xmm1, (%rdx, %rdi) // Store four destination pixels
-.LAlphaZero04:
- addq $16, %rdi
- subl $4, %ecx
- jmp .LSmallRemaining // Reuse code from small loop
-
-.LAlphaNotOpaqueOrZero02:
- movdqa (%rdx, %rdi), %xmm5 // Load four destination pixels
- EXTRACT_ALPHA(xmm1, xmm2) // Extract and clone alpha value
- SCALE_PIXELS // Scale pixels using alpha
-
- addq $16, %rdi
- subl $4, %ecx
- pblendvb %xmm5, %xmm3 // Combine results (mask in %xmm0, implicitly)
- paddb %xmm3, %xmm1 // Add source and destination pixels together
- movdqa %xmm1, -16(%rdx, %rdi) // Store four destination pixels
- js .LSmallRemaining // Reuse code from small loop
- jmp .LRemain0
-
- // Source aligned to destination
- ////////////////////////////////////////////////////////////////////////////////
- .p2align 4
-.LAlignedLoop: // Main loop for aligned, handles eight pixels per iteration
- ptest %xmm7, %xmm1 // Check if all alphas are zero or opaque
- ja .LAlphaNotOpaqueOrZero10
- movdqa 16(%rax, %rdi), %xmm2 // Pre-load four source pixels
- jz .LAlphaZero10
- movdqa %xmm1, (%rdx, %rdi) // Store four destination pixels
-
-.LAlphaZero10:
- ptest %xmm7, %xmm2 // Check if all alphas are zero or opaque
- ja .LAlphaNotOpaqueOrZero11
- movdqa 32(%rax, %rdi), %xmm1 // Pre-load four source pixels
- jz .LAlphaZero11
- movdqa %xmm2, 16(%rdx, %rdi) // Store four destination pixels
-
-.LAlphaZero11:
- addq $32, %rdi // Adjust offset and pixel count
- subl $8, %ecx
- jae .LAlignedLoop
- addl $8, %ecx // Adjust pixel count
- jmp .LLoopCleanup1
-
- .p2align 4
-.LAlphaNotOpaqueOrZero10:
- movdqa (%rdx, %rdi), %xmm5 // Load four destination pixels
- EXTRACT_ALPHA(xmm1, xmm2) // Extract and clone alpha value
- SCALE_PIXELS // Scale pixels using alpha
-
- movdqa 16(%rax, %rdi), %xmm2 // Pre-load four source pixels
- pblendvb %xmm5, %xmm3 // Combine results (mask in %xmm0, implicitly)
- paddb %xmm3, %xmm1 // Add source and destination pixels together
- movdqa %xmm1, (%rdx, %rdi) // Store four destination pixels
-
- // Handle next four pixels
- ptest %xmm7, %xmm2 // Check if all alphas are zero or opaque
- ja .LAlphaNotOpaqueOrZero11
- movdqa 32(%rax, %rdi), %xmm1 // Pre-load four source pixels
- jz .LAlphaZero12
- movdqa %xmm2, 16(%rdx, %rdi) // Store four destination pixels
-.LAlphaZero12:
- addq $32, %rdi // Adjust offset and pixel count
- subl $8, %ecx
- jae .LAlignedLoop
- addl $8, %ecx // Adjust pixel count
- jmp .LLoopCleanup1
-
- .p2align 4
-.LAlphaNotOpaqueOrZero11:
- movdqa 16(%rdx, %rdi), %xmm5 // Load four destination pixels
- EXTRACT_ALPHA(xmm2, xmm1) // Extract and clone alpha value
- SCALE_PIXELS // Scale pixels using alpha
- movdqa 32(%rax, %rdi), %xmm1 // Pre-load four source pixels
-
- addq $32, %rdi
- pblendvb %xmm5, %xmm3 // Combine results (mask in %xmm0, implicitly)
- paddb %xmm3, %xmm2 // Add source and destination pixels together
- subl $8, %ecx
- movdqa %xmm2, -16(%rdx, %rdi) // Store four destination pixels
- jae .LAlignedLoop
- addl $8, %ecx // Adjust pixel count
-
- // Cleanup - handle four pending pixels from loop
-.LLoopCleanup1:
- ptest %xmm7, %xmm1 // Check if all alphas are zero or opaque
- ja .LAlphaNotOpaqueOrZero12
- jz .LAlphaZero13
- movdqa %xmm1, (%rdx, %rdi) // Store four destination pixels
-.LAlphaZero13:
- addq $16, %rdi
- subl $4, %ecx
- js .LSmallRemaining // Reuse code from small loop
-
-.LRemain1:
- movdqa (%rax, %rdi), %xmm1 // Pre-load four source pixels
- ptest %xmm7, %xmm1 // Check if all alphas are zero or opaque
- ja .LAlphaNotOpaqueOrZero12
- jz .LAlphaZero14
- movdqa %xmm1, (%rdx, %rdi) // Store four destination pixels
-.LAlphaZero14:
- addq $16, %rdi
- subl $4, %ecx
- jmp .LSmallRemaining // Reuse code from small loop
-
-.LAlphaNotOpaqueOrZero12:
- movdqa (%rdx, %rdi), %xmm5 // Load four destination pixels
- EXTRACT_ALPHA(xmm1, xmm2) // Extract and clone alpha value
- SCALE_PIXELS // Scale pixels using alpha
-
- addq $16, %rdi
- subl $4, %ecx
- pblendvb %xmm5, %xmm3 // Combine results (mask in %xmm0, implicitly)
- paddb %xmm3, %xmm1 // Add source and destination pixels together
- movdqa %xmm1, -16(%rdx, %rdi) // Store four destination pixels
- js .LSmallRemaining // Reuse code from small loop
- jmp .LRemain1
-
- .cfi_endproc
-#ifndef __clang__
- .size S32A_Opaque_BlitRow32_SSE4_asm, .-S32A_Opaque_BlitRow32_SSE4_asm
-#endif
-
- // Constants for SSE code
-#ifndef __clang__
- .section .rodata
-#endif
- .p2align 4
-.LAlphaCheckMask:
- .long 0xFF000000, 0xFF000000, 0xFF000000, 0xFF000000
-.LInverseAlphaCalc:
- .word 256, 256, 256, 256, 256, 256, 256, 256
-.LResultMergeMask:
- .long 0x00FF00FF, 0x00FF00FF, 0x00FF00FF, 0x00FF00FF
-#endif
-
-#endif // CRBUG_399842_FIXED
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