MIPS: added optimization for SkRGB16_Opaque_Blitter::blitMask

src/opts/SkBlitRow_opts_mips_dsp.cpp

Index: src/opts/SkBlitRow_opts_mips_dsp.cpp
diff --git a/src/opts/SkBlitRow_opts_mips_dsp.cpp b/src/opts/SkBlitRow_opts_mips_dsp.cpp
index 30bb4c2701a5e8535fd4b2258f05a2a227e6b90d..5487d0df5fcb9146352a3fa184cdc17c08675d79 100644
--- a/src/opts/SkBlitRow_opts_mips_dsp.cpp
+++ b/src/opts/SkBlitRow_opts_mips_dsp.cpp
@@ -808,6 +808,117 @@ static void S32_Blend_BlitRow32_mips_dsp(SkPMColor* SK_RESTRICT dst,
     );
 }
 
+void blitmask_d565_opaque_mips(int width, int height, uint16_t* device,
+                               unsigned deviceRB, const uint8_t* alpha,
+                               uint32_t expanded32, unsigned maskRB) {
+    register uint32_t s0, s1, s2, s3;
+
+    __asm__ volatile (
+        ".set            push                                    \n\t"
+        ".set            noreorder                               \n\t"
+        ".set            noat                                    \n\t"
+        "li              $t9,       0x7E0F81F                    \n\t"
+    "1:                                                          \n\t"
+        "move            $t8,       %[width]                     \n\t"
+        "addiu           %[height], %[height],     -1            \n\t"
+    "2:                                                          \n\t"
+        "beqz            $t8,       4f                           \n\t"
+        " addiu          $t0,       $t8,           -4            \n\t"
+        "bltz            $t0,       3f                           \n\t"
+        " nop                                                    \n\t"
+        "addiu           $t8,       $t8,           -4            \n\t"
+        "lhu             $t0,       0(%[device])                 \n\t"
+        "lhu             $t1,       2(%[device])                 \n\t"
+        "lhu             $t2,       4(%[device])                 \n\t"
+        "lhu             $t3,       6(%[device])                 \n\t"
+        "lbu             $t4,       0(%[alpha])                  \n\t"
+        "lbu             $t5,       1(%[alpha])                  \n\t"
+        "lbu             $t6,       2(%[alpha])                  \n\t"
+        "lbu             $t7,       3(%[alpha])                  \n\t"
+        "replv.ph        $t0,       $t0                          \n\t"
+        "replv.ph        $t1,       $t1                          \n\t"
+        "replv.ph        $t2,       $t2                          \n\t"
+        "replv.ph        $t3,       $t3                          \n\t"
+        "addiu           %[s0],     $t4,           1             \n\t"
+        "addiu           %[s1],     $t5,           1             \n\t"
+        "addiu           %[s2],     $t6,           1             \n\t"
+        "addiu           %[s3],     $t7,           1             \n\t"
+        "srl             %[s0],     %[s0],         3             \n\t"
+        "srl             %[s1],     %[s1],         3             \n\t"
+        "srl             %[s2],     %[s2],         3             \n\t"
+        "srl             %[s3],     %[s3],         3             \n\t"
+        "and             $t0,       $t0,           $t9           \n\t"
+        "and             $t1,       $t1,           $t9           \n\t"
+        "and             $t2,       $t2,           $t9           \n\t"
+        "and             $t3,       $t3,           $t9           \n\t"
+        "subu            $t4,       %[expanded32], $t0           \n\t"
+        "subu            $t5,       %[expanded32], $t1           \n\t"
+        "subu            $t6,       %[expanded32], $t2           \n\t"
+        "subu            $t7,       %[expanded32], $t3           \n\t"
+        "mul             $t4,       $t4,           %[s0]         \n\t"
+        "mul             $t5,       $t5,           %[s1]         \n\t"
+        "mul             $t6,       $t6,           %[s2]         \n\t"
+        "mul             $t7,       $t7,           %[s3]         \n\t"
+        "addiu           %[alpha],  %[alpha],      4             \n\t"
+        "srl             $t4,       $t4,           5             \n\t"
+        "srl             $t5,       $t5,           5             \n\t"
+        "srl             $t6,       $t6,           5             \n\t"
+        "srl             $t7,       $t7,           5             \n\t"
+        "addu            $t4,       $t0,           $t4           \n\t"
+        "addu            $t5,       $t1,           $t5           \n\t"
+        "addu            $t6,       $t2,           $t6           \n\t"
+        "addu            $t7,       $t3,           $t7           \n\t"
+        "and             $t4,       $t4,           $t9           \n\t"
+        "and             $t5,       $t5,           $t9           \n\t"
+        "and             $t6,       $t6,           $t9           \n\t"
+        "and             $t7,       $t7,           $t9           \n\t"
+        "srl             $t0,       $t4,           16            \n\t"
+        "srl             $t1,       $t5,           16            \n\t"
+        "srl             $t2,       $t6,           16            \n\t"
+        "srl             $t3,       $t7,           16            \n\t"
+        "or              %[s0],     $t0,           $t4           \n\t"
+        "or              %[s1],     $t1,           $t5           \n\t"
+        "or              %[s2],     $t2,           $t6           \n\t"
+        "or              %[s3],     $t3,           $t7           \n\t"
+        "sh              %[s0],     0(%[device])                 \n\t"
+        "sh              %[s1],     2(%[device])                 \n\t"
+        "sh              %[s2],     4(%[device])                 \n\t"
+        "sh              %[s3],     6(%[device])                 \n\t"
+        "b               2b                                      \n\t"
+        " addiu          %[device], %[device],     8             \n\t"
+    "3:                                                          \n\t"
+        "lhu             $t0,       0(%[device])                 \n\t"
+        "lbu             $t1,       0(%[alpha])                  \n\t"
+        "addiu           $t8,       $t8,           -1            \n\t"
+        "replv.ph        $t2,       $t0                          \n\t"
+        "and             $t2,       $t2,           $t9           \n\t"
+        "addiu           $t0,       $t1,           1             \n\t"
+        "srl             $t0,       $t0,           3             \n\t"
+        "subu            $t3,       %[expanded32], $t2           \n\t"
+        "mul             $t3,       $t3,           $t0           \n\t"
+        "addiu           %[alpha],  %[alpha],      1             \n\t"
+        "srl             $t3,       $t3,           5             \n\t"
+        "addu            $t3,       $t2,           $t3           \n\t"
+        "and             $t3,       $t3,           $t9           \n\t"
+        "srl             $t4,       $t3,           16            \n\t"
+        "or              %[s0],     $t4,           $t3           \n\t"
+        "sh              %[s0],     0(%[device])                 \n\t"
+        "bnez            $t8,       3b                           \n\t"
+         "addiu          %[device], %[device],     2             \n\t"
+    "4:                                                          \n\t"
+        "addu            %[device], %[device],     %[deviceRB]   \n\t"
+        "bgtz            %[height], 1b                           \n\t"
+        " addu           %[alpha],  %[alpha],      %[maskRB]     \n\t"
+        ".set            pop                                     \n\t"
+        : [height]"+r"(height), [alpha]"+r"(alpha), [device]"+r"(device),
+          [deviceRB]"+r"(deviceRB), [maskRB]"+r"(maskRB), [s0]"=&r"(s0),
+          [s1]"=&r"(s1), [s2]"=&r"(s2), [s3]"=&r"(s3)
+        : [expanded32] "r" (expanded32), [width] "r" (width)
+        : "memory", "hi", "lo", "t0", "t1", "t2", "t3",
+          "t4", "t5", "t6", "t7", "t8", "t9"
+    );
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 const SkBlitRow::Proc platform_565_procs_mips_dsp[] = {