lowp: add constant_color, swap, move_dst_src

This is enough for us to do some really simple draws.
Also add some debug tools to help prioritize porting.

Change-Id: I334f8fd2133be1aeec3f3406371a81aa6c184776
Reviewed-on: https://skia-review.googlesource.com/18597
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Herb Derby <herb@google.com>

4 files changed, 234 insertions, 49 deletions

diff --git a/src/jumper/SkJumper.cpp b/src/jumper/SkJumper.cpp
index 535e4a883b..4244bfda9f 100644
--- a/src/jumper/SkJumper.cpp
+++ b/src/jumper/SkJumper.cpp
@@ -26,6 +26,37 @@ static K kConstants = {
     {0,1,2,3,4,5,6,7},
 };
 
+#define M(st) +1
+static const int kNumStages = SK_RASTER_PIPELINE_STAGES(M);
+#undef M
+
+#if !__has_feature(memory_sanitizer) && (defined(__x86_64__) || defined(_M_X64))
+    #if 0
+        #include <atomic>
+
+        #define M(st) #st,
+        static const char* kStageNames[] = { SK_RASTER_PIPELINE_STAGES(M) };
+        #undef M
+
+        static std::atomic<int> gMissingStageCounters[kNumStages];
+
+        static void log_missing(SkRasterPipeline::StockStage st) {
+            static SkOnce once;
+            once([] { atexit([] {
+                for (int i = 0; i < kNumStages; i++) {
+                    if (int count = gMissingStageCounters[i].load()) {
+                        SkDebugf("%7d\t%s\n", count, kStageNames[i]);
+                    }
+                }
+            }); });
+
+            gMissingStageCounters[st]++;
+        }
+    #else
+        static void log_missing(SkRasterPipeline::StockStage) {}
+    #endif
+#endif
+
 // We can't express the real types of most stage functions portably, so we use a stand-in.
 // We'll only ever call start_pipeline(), which then chains into the rest for us.
 using StageFn = void(void);
@@ -38,6 +69,17 @@ using StartPipelineFn = void(size_t,size_t,size_t,void**,K*);
     #define ASM(name, suffix) _sk_##name##_##suffix
 #endif
 
+// Some stages have low-precision (~15 bit) versions from SkJumper_stages_lowp.cpp.
+#define LOWP_STAGES(M)  \
+    M(constant_color)   \
+    M(load_8888)        \
+    M(store_8888)       \
+    M(swap_rb)          \
+    M(swap)             \
+    M(move_src_dst)     \
+    M(move_dst_src)     \
+    M(srcover)
+
 extern "C" {
 
 #if __has_feature(memory_sanitizer)
@@ -83,11 +125,9 @@ extern "C" {
         SK_RASTER_PIPELINE_STAGES(M)
     #undef M
 
-    StageFn ASM(load_8888,    ssse3_lowp),
-            ASM(store_8888,   ssse3_lowp),
-            ASM(swap_rb,      ssse3_lowp),
-            ASM(move_src_dst, ssse3_lowp),
-            ASM(srcover,      ssse3_lowp);
+    #define M(st) StageFn ASM(st,ssse3_lowp);
+        LOWP_STAGES(M)
+    #undef M
 #endif
 
     // Portable, single-pixel stages.
@@ -98,10 +138,6 @@ extern "C" {
     #undef M
 }
 
-#define M(st) +1
-static const int kNumStages = SK_RASTER_PIPELINE_STAGES(M);
-#undef M
-
 // Engines comprise everything we need to run SkRasterPipelines.
 struct SkJumper_Engine {
     StageFn*         stages[kNumStages];
@@ -188,13 +224,11 @@ StartPipelineFn* SkRasterPipeline::build_pipeline(void** ip) const {
         for (const StageList* st = fStages; st; st = st->prev) {
             StageFn* fn = nullptr;
             switch (st->stage) {
-                case SkRasterPipeline::load_8888:    fn = ASM(load_8888,    ssse3_lowp); break;
-                case SkRasterPipeline::store_8888:   fn = ASM(store_8888,   ssse3_lowp); break;
-                case SkRasterPipeline::swap_rb:      fn = ASM(swap_rb,      ssse3_lowp); break;
-                case SkRasterPipeline::move_src_dst: fn = ASM(move_src_dst, ssse3_lowp); break;
-                case SkRasterPipeline::srcover:      fn = ASM(srcover,      ssse3_lowp); break;
+            #define M(st) case SkRasterPipeline::st: fn = ASM(st, ssse3_lowp); break;
+                LOWP_STAGES(M)
+            #undef M
                 default:
-                    //SkDebugf("can't %d\n", st->stage);
+                    log_missing(st->stage);
                     ip = reset_point;
             }
             if (ip == reset_point) {
diff --git a/src/jumper/SkJumper_generated.S b/src/jumper/SkJumper_generated.S
index de0fb731a0..eba1759a3f 100644
--- a/src/jumper/SkJumper_generated.S
+++ b/src/jumper/SkJumper_generated.S
@@ -36943,6 +36943,38 @@ FUNCTION(_sk_just_return_ssse3_lowp)
 _sk_just_return_ssse3_lowp:
   .byte  195                                 // retq
 
+HIDDEN _sk_constant_color_ssse3_lowp
+.globl _sk_constant_color_ssse3_lowp
+FUNCTION(_sk_constant_color_ssse3_lowp)
+_sk_constant_color_ssse3_lowp:
+  .byte  72,173                              // lods          %ds:(%rsi),%rax
+  .byte  243,15,16,29,114,3,0,0              // movss         0x372(%rip),%xmm3        # 428 <_sk_srcover_ssse3_lowp+0x65>
+  .byte  243,15,16,0                         // movss         (%rax),%xmm0
+  .byte  243,15,89,195                       // mulss         %xmm3,%xmm0
+  .byte  243,68,15,44,200                    // cvttss2si     %xmm0,%r9d
+  .byte  102,65,15,110,193                   // movd          %r9d,%xmm0
+  .byte  242,15,112,192,0                    // pshuflw       $0x0,%xmm0,%xmm0
+  .byte  102,15,112,192,80                   // pshufd        $0x50,%xmm0,%xmm0
+  .byte  243,15,16,72,4                      // movss         0x4(%rax),%xmm1
+  .byte  243,15,89,203                       // mulss         %xmm3,%xmm1
+  .byte  243,68,15,44,201                    // cvttss2si     %xmm1,%r9d
+  .byte  102,65,15,110,201                   // movd          %r9d,%xmm1
+  .byte  242,15,112,201,0                    // pshuflw       $0x0,%xmm1,%xmm1
+  .byte  102,15,112,201,80                   // pshufd        $0x50,%xmm1,%xmm1
+  .byte  243,15,16,80,8                      // movss         0x8(%rax),%xmm2
+  .byte  243,15,89,211                       // mulss         %xmm3,%xmm2
+  .byte  243,68,15,44,202                    // cvttss2si     %xmm2,%r9d
+  .byte  102,65,15,110,209                   // movd          %r9d,%xmm2
+  .byte  242,15,112,210,0                    // pshuflw       $0x0,%xmm2,%xmm2
+  .byte  102,15,112,210,80                   // pshufd        $0x50,%xmm2,%xmm2
+  .byte  243,15,89,88,12                     // mulss         0xc(%rax),%xmm3
+  .byte  243,15,44,195                       // cvttss2si     %xmm3,%eax
+  .byte  102,15,110,216                      // movd          %eax,%xmm3
+  .byte  242,15,112,219,0                    // pshuflw       $0x0,%xmm3,%xmm3
+  .byte  102,15,112,219,80                   // pshufd        $0x50,%xmm3,%xmm3
+  .byte  72,173                              // lods          %ds:(%rsi),%rax
+  .byte  255,224                             // jmpq          *%rax
+
 HIDDEN _sk_load_8888_ssse3_lowp
 .globl _sk_load_8888_ssse3_lowp
 FUNCTION(_sk_load_8888_ssse3_lowp)
@@ -36950,10 +36982,10 @@ _sk_load_8888_ssse3_lowp:
   .byte  72,173                              // lods          %ds:(%rsi),%rax
   .byte  76,139,24                           // mov           (%rax),%r11
   .byte  77,133,192                          // test          %r8,%r8
-  .byte  117,113                             // jne           127 <_sk_load_8888_ssse3_lowp+0x7b>
+  .byte  117,113                             // jne           1a2 <_sk_load_8888_ssse3_lowp+0x7b>
   .byte  69,15,16,76,147,16                  // movups        0x10(%r11,%rdx,4),%xmm9
   .byte  69,15,16,4,147                      // movups        (%r11,%rdx,4),%xmm8
-  .byte  102,15,111,5,167,2,0,0              // movdqa        0x2a7(%rip),%xmm0        # 370 <_sk_srcover_ssse3_lowp+0x65>
+  .byte  102,15,111,5,236,2,0,0              // movdqa        0x2ec(%rip),%xmm0        # 430 <_sk_srcover_ssse3_lowp+0x6d>
   .byte  102,68,15,56,0,192                  // pshufb        %xmm0,%xmm8
   .byte  102,68,15,56,0,200                  // pshufb        %xmm0,%xmm9
   .byte  102,65,15,111,208                   // movdqa        %xmm8,%xmm2
@@ -36967,7 +36999,7 @@ _sk_load_8888_ssse3_lowp:
   .byte  102,15,239,210                      // pxor          %xmm2,%xmm2
   .byte  102,65,15,96,208                    // punpcklbw     %xmm8,%xmm2
   .byte  102,65,15,104,216                   // punpckhbw     %xmm8,%xmm3
-  .byte  102,68,15,111,5,113,2,0,0           // movdqa        0x271(%rip),%xmm8        # 380 <_sk_srcover_ssse3_lowp+0x75>
+  .byte  102,68,15,111,5,182,2,0,0           // movdqa        0x2b6(%rip),%xmm8        # 440 <_sk_srcover_ssse3_lowp+0x7d>
   .byte  102,65,15,228,192                   // pmulhuw       %xmm8,%xmm0
   .byte  102,65,15,228,200                   // pmulhuw       %xmm8,%xmm1
   .byte  102,65,15,228,208                   // pmulhuw       %xmm8,%xmm2
@@ -36980,9 +37012,9 @@ _sk_load_8888_ssse3_lowp:
   .byte  69,15,87,192                        // xorps         %xmm8,%xmm8
   .byte  65,254,201                          // dec           %r9b
   .byte  65,128,249,6                        // cmp           $0x6,%r9b
-  .byte  119,129                             // ja            c1 <_sk_load_8888_ssse3_lowp+0x15>
+  .byte  119,129                             // ja            13c <_sk_load_8888_ssse3_lowp+0x15>
   .byte  69,15,182,201                       // movzbl        %r9b,%r9d
-  .byte  76,141,21,133,0,0,0                 // lea           0x85(%rip),%r10        # 1d0 <_sk_load_8888_ssse3_lowp+0x124>
+  .byte  76,141,21,130,0,0,0                 // lea           0x82(%rip),%r10        # 248 <_sk_load_8888_ssse3_lowp+0x121>
   .byte  75,99,4,138                         // movslq        (%r10,%r9,4),%rax
   .byte  76,1,208                            // add           %r10,%rax
   .byte  255,224                             // jmpq          *%rax
@@ -37007,21 +37039,20 @@ _sk_load_8888_ssse3_lowp:
   .byte  68,15,40,192                        // movaps        %xmm0,%xmm8
   .byte  243,65,15,16,4,147                  // movss         (%r11,%rdx,4),%xmm0
   .byte  243,68,15,16,192                    // movss         %xmm0,%xmm8
-  .byte  233,244,254,255,255                 // jmpq          c1 <_sk_load_8888_ssse3_lowp+0x15>
-  .byte  15,31,0                             // nopl          (%rax)
-  .byte  237                                 // in            (%dx),%eax
+  .byte  233,244,254,255,255                 // jmpq          13c <_sk_load_8888_ssse3_lowp+0x15>
+  .byte  240,255                             // lock          (bad)
   .byte  255                                 // (bad)
   .byte  255                                 // (bad)
+  .byte  219,255                             // (bad)
   .byte  255                                 // (bad)
-  .byte  216,255                             // fdivr         %st(7),%st
+  .byte  255,202                             // dec           %edx
   .byte  255                                 // (bad)
-  .byte  255,199                             // inc           %edi
   .byte  255                                 // (bad)
   .byte  255                                 // (bad)
-  .byte  255,182,255,255,255,170             // pushq         -0x55000001(%rsi)
+  .byte  185,255,255,255,173                 // mov           $0xadffffff,%ecx
   .byte  255                                 // (bad)
   .byte  255                                 // (bad)
-  .byte  255,149,255,255,255,132             // callq         *-0x7b000001(%rbp)
+  .byte  255,152,255,255,255,135             // lcall         *-0x78000001(%rax)
   .byte  255                                 // (bad)
   .byte  255                                 // (bad)
   .byte  255                                 // .byte         0xff
@@ -37049,7 +37080,7 @@ _sk_store_8888_ssse3_lowp:
   .byte  102,69,15,97,194                    // punpcklwd     %xmm10,%xmm8
   .byte  102,69,15,105,202                   // punpckhwd     %xmm10,%xmm9
   .byte  77,133,192                          // test          %r8,%r8
-  .byte  117,17                              // jne           25b <_sk_store_8888_ssse3_lowp+0x6f>
+  .byte  117,17                              // jne           2d3 <_sk_store_8888_ssse3_lowp+0x6f>
   .byte  243,69,15,127,76,147,16             // movdqu        %xmm9,0x10(%r11,%rdx,4)
   .byte  243,69,15,127,4,147                 // movdqu        %xmm8,(%r11,%rdx,4)
   .byte  72,173                              // lods          %ds:(%rsi),%rax
@@ -37058,9 +37089,9 @@ _sk_store_8888_ssse3_lowp:
   .byte  65,128,225,7                        // and           $0x7,%r9b
   .byte  65,254,201                          // dec           %r9b
   .byte  65,128,249,6                        // cmp           $0x6,%r9b
-  .byte  119,236                             // ja            257 <_sk_store_8888_ssse3_lowp+0x6b>
+  .byte  119,236                             // ja            2cf <_sk_store_8888_ssse3_lowp+0x6b>
   .byte  69,15,182,201                       // movzbl        %r9b,%r9d
-  .byte  76,141,21,90,0,0,0                  // lea           0x5a(%rip),%r10        # 2d0 <_sk_store_8888_ssse3_lowp+0xe4>
+  .byte  76,141,21,90,0,0,0                  // lea           0x5a(%rip),%r10        # 348 <_sk_store_8888_ssse3_lowp+0xe4>
   .byte  75,99,4,138                         // movslq        (%r10,%r9,4),%rax
   .byte  76,1,208                            // add           %r10,%rax
   .byte  255,224                             // jmpq          *%rax
@@ -37076,7 +37107,7 @@ _sk_store_8888_ssse3_lowp:
   .byte  102,69,15,112,200,229               // pshufd        $0xe5,%xmm8,%xmm9
   .byte  102,69,15,126,76,147,4              // movd          %xmm9,0x4(%r11,%rdx,4)
   .byte  102,69,15,126,4,147                 // movd          %xmm8,(%r11,%rdx,4)
-  .byte  235,136                             // jmp           257 <_sk_store_8888_ssse3_lowp+0x6b>
+  .byte  235,136                             // jmp           2cf <_sk_store_8888_ssse3_lowp+0x6b>
   .byte  144                                 // nop
   .byte  247,255                             // idiv          %edi
   .byte  255                                 // (bad)
@@ -37109,6 +37140,25 @@ _sk_swap_rb_ssse3_lowp:
   .byte  65,15,40,208                        // movaps        %xmm8,%xmm2
   .byte  255,224                             // jmpq          *%rax
 
+HIDDEN _sk_swap_ssse3_lowp
+.globl _sk_swap_ssse3_lowp
+FUNCTION(_sk_swap_ssse3_lowp)
+_sk_swap_ssse3_lowp:
+  .byte  68,15,40,195                        // movaps        %xmm3,%xmm8
+  .byte  68,15,40,202                        // movaps        %xmm2,%xmm9
+  .byte  68,15,40,209                        // movaps        %xmm1,%xmm10
+  .byte  68,15,40,216                        // movaps        %xmm0,%xmm11
+  .byte  72,173                              // lods          %ds:(%rsi),%rax
+  .byte  15,40,196                           // movaps        %xmm4,%xmm0
+  .byte  15,40,205                           // movaps        %xmm5,%xmm1
+  .byte  15,40,214                           // movaps        %xmm6,%xmm2
+  .byte  15,40,223                           // movaps        %xmm7,%xmm3
+  .byte  65,15,40,227                        // movaps        %xmm11,%xmm4
+  .byte  65,15,40,234                        // movaps        %xmm10,%xmm5
+  .byte  65,15,40,241                        // movaps        %xmm9,%xmm6
+  .byte  65,15,40,248                        // movaps        %xmm8,%xmm7
+  .byte  255,224                             // jmpq          *%rax
+
 HIDDEN _sk_move_src_dst_ssse3_lowp
 .globl _sk_move_src_dst_ssse3_lowp
 FUNCTION(_sk_move_src_dst_ssse3_lowp)
@@ -37120,11 +37170,22 @@ _sk_move_src_dst_ssse3_lowp:
   .byte  15,40,251                           // movaps        %xmm3,%xmm7
   .byte  255,224                             // jmpq          *%rax
 
+HIDDEN _sk_move_dst_src_ssse3_lowp
+.globl _sk_move_dst_src_ssse3_lowp
+FUNCTION(_sk_move_dst_src_ssse3_lowp)
+_sk_move_dst_src_ssse3_lowp:
+  .byte  72,173                              // lods          %ds:(%rsi),%rax
+  .byte  15,40,196                           // movaps        %xmm4,%xmm0
+  .byte  15,40,205                           // movaps        %xmm5,%xmm1
+  .byte  15,40,214                           // movaps        %xmm6,%xmm2
+  .byte  15,40,223                           // movaps        %xmm7,%xmm3
+  .byte  255,224                             // jmpq          *%rax
+
 HIDDEN _sk_srcover_ssse3_lowp
 .globl _sk_srcover_ssse3_lowp
 FUNCTION(_sk_srcover_ssse3_lowp)
 _sk_srcover_ssse3_lowp:
-  .byte  102,68,15,111,5,124,0,0,0           // movdqa        0x7c(%rip),%xmm8        # 390 <_sk_srcover_ssse3_lowp+0x85>
+  .byte  102,68,15,111,5,132,0,0,0           // movdqa        0x84(%rip),%xmm8        # 450 <_sk_srcover_ssse3_lowp+0x8d>
   .byte  102,68,15,249,195                   // psubw         %xmm3,%xmm8
   .byte  102,68,15,111,204                   // movdqa        %xmm4,%xmm9
   .byte  102,69,15,56,11,200                 // pmulhrsw      %xmm8,%xmm9
@@ -37144,6 +37205,11 @@ _sk_srcover_ssse3_lowp:
   .byte  72,173                              // lods          %ds:(%rsi),%rax
   .byte  255,224                             // jmpq          *%rax
 
+BALIGN4
+  .byte  0,0                                 // add           %al,(%rax)
+  .byte  0                                   // .byte         0x0
+  .byte  71                                  // rex.RXB
+
 BALIGN16
   .byte  0,4,8                               // add           %al,(%rax,%rcx,1)
   .byte  12,1                                // or            $0x1,%al
diff --git a/src/jumper/SkJumper_generated_win.S b/src/jumper/SkJumper_generated_win.S
index 67c9b86a2b..a7848d3706 100644
--- a/src/jumper/SkJumper_generated_win.S
+++ b/src/jumper/SkJumper_generated_win.S
@@ -26358,15 +26358,45 @@ PUBLIC _sk_just_return_ssse3_lowp
 _sk_just_return_ssse3_lowp LABEL PROC
   DB  195                                 ; retq
 
+PUBLIC _sk_constant_color_ssse3_lowp
+_sk_constant_color_ssse3_lowp LABEL PROC
+  DB  72,173                              ; lods          %ds:(%rsi),%rax
+  DB  243,15,16,29,114,3,0,0              ; movss         0x372(%rip),%xmm3        # 4b8 <_sk_srcover_ssse3_lowp+0x65>
+  DB  243,15,16,0                         ; movss         (%rax),%xmm0
+  DB  243,15,89,195                       ; mulss         %xmm3,%xmm0
+  DB  243,68,15,44,200                    ; cvttss2si     %xmm0,%r9d
+  DB  102,65,15,110,193                   ; movd          %r9d,%xmm0
+  DB  242,15,112,192,0                    ; pshuflw       $0x0,%xmm0,%xmm0
+  DB  102,15,112,192,80                   ; pshufd        $0x50,%xmm0,%xmm0
+  DB  243,15,16,72,4                      ; movss         0x4(%rax),%xmm1
+  DB  243,15,89,203                       ; mulss         %xmm3,%xmm1
+  DB  243,68,15,44,201                    ; cvttss2si     %xmm1,%r9d
+  DB  102,65,15,110,201                   ; movd          %r9d,%xmm1
+  DB  242,15,112,201,0                    ; pshuflw       $0x0,%xmm1,%xmm1
+  DB  102,15,112,201,80                   ; pshufd        $0x50,%xmm1,%xmm1
+  DB  243,15,16,80,8                      ; movss         0x8(%rax),%xmm2
+  DB  243,15,89,211                       ; mulss         %xmm3,%xmm2
+  DB  243,68,15,44,202                    ; cvttss2si     %xmm2,%r9d
+  DB  102,65,15,110,209                   ; movd          %r9d,%xmm2
+  DB  242,15,112,210,0                    ; pshuflw       $0x0,%xmm2,%xmm2
+  DB  102,15,112,210,80                   ; pshufd        $0x50,%xmm2,%xmm2
+  DB  243,15,89,88,12                     ; mulss         0xc(%rax),%xmm3
+  DB  243,15,44,195                       ; cvttss2si     %xmm3,%eax
+  DB  102,15,110,216                      ; movd          %eax,%xmm3
+  DB  242,15,112,219,0                    ; pshuflw       $0x0,%xmm3,%xmm3
+  DB  102,15,112,219,80                   ; pshufd        $0x50,%xmm3,%xmm3
+  DB  72,173                              ; lods          %ds:(%rsi),%rax
+  DB  255,224                             ; jmpq          *%rax
+
 PUBLIC _sk_load_8888_ssse3_lowp
 _sk_load_8888_ssse3_lowp LABEL PROC
   DB  72,173                              ; lods          %ds:(%rsi),%rax
   DB  76,139,24                           ; mov           (%rax),%r11
   DB  77,133,192                          ; test          %r8,%r8
-  DB  117,113                             ; jne           1b7 <_sk_load_8888_ssse3_lowp+0x7b>
+  DB  117,113                             ; jne           232 <_sk_load_8888_ssse3_lowp+0x7b>
   DB  69,15,16,76,147,16                  ; movups        0x10(%r11,%rdx,4),%xmm9
   DB  69,15,16,4,147                      ; movups        (%r11,%rdx,4),%xmm8
-  DB  102,15,111,5,167,2,0,0              ; movdqa        0x2a7(%rip),%xmm0        # 400 <_sk_srcover_ssse3_lowp+0x65>
+  DB  102,15,111,5,236,2,0,0              ; movdqa        0x2ec(%rip),%xmm0        # 4c0 <_sk_srcover_ssse3_lowp+0x6d>
   DB  102,68,15,56,0,192                  ; pshufb        %xmm0,%xmm8
   DB  102,68,15,56,0,200                  ; pshufb        %xmm0,%xmm9
   DB  102,65,15,111,208                   ; movdqa        %xmm8,%xmm2
@@ -26380,7 +26410,7 @@ _sk_load_8888_ssse3_lowp LABEL PROC
   DB  102,15,239,210                      ; pxor          %xmm2,%xmm2
   DB  102,65,15,96,208                    ; punpcklbw     %xmm8,%xmm2
   DB  102,65,15,104,216                   ; punpckhbw     %xmm8,%xmm3
-  DB  102,68,15,111,5,113,2,0,0           ; movdqa        0x271(%rip),%xmm8        # 410 <_sk_srcover_ssse3_lowp+0x75>
+  DB  102,68,15,111,5,182,2,0,0           ; movdqa        0x2b6(%rip),%xmm8        # 4d0 <_sk_srcover_ssse3_lowp+0x7d>
   DB  102,65,15,228,192                   ; pmulhuw       %xmm8,%xmm0
   DB  102,65,15,228,200                   ; pmulhuw       %xmm8,%xmm1
   DB  102,65,15,228,208                   ; pmulhuw       %xmm8,%xmm2
@@ -26393,9 +26423,9 @@ _sk_load_8888_ssse3_lowp LABEL PROC
   DB  69,15,87,192                        ; xorps         %xmm8,%xmm8
   DB  65,254,201                          ; dec           %r9b
   DB  65,128,249,6                        ; cmp           $0x6,%r9b
-  DB  119,129                             ; ja            151 <_sk_load_8888_ssse3_lowp+0x15>
+  DB  119,129                             ; ja            1cc <_sk_load_8888_ssse3_lowp+0x15>
   DB  69,15,182,201                       ; movzbl        %r9b,%r9d
-  DB  76,141,21,133,0,0,0                 ; lea           0x85(%rip),%r10        # 260 <_sk_load_8888_ssse3_lowp+0x124>
+  DB  76,141,21,130,0,0,0                 ; lea           0x82(%rip),%r10        # 2d8 <_sk_load_8888_ssse3_lowp+0x121>
   DB  75,99,4,138                         ; movslq        (%r10,%r9,4),%rax
   DB  76,1,208                            ; add           %r10,%rax
   DB  255,224                             ; jmpq          *%rax
@@ -26420,21 +26450,20 @@ _sk_load_8888_ssse3_lowp LABEL PROC
   DB  68,15,40,192                        ; movaps        %xmm0,%xmm8
   DB  243,65,15,16,4,147                  ; movss         (%r11,%rdx,4),%xmm0
   DB  243,68,15,16,192                    ; movss         %xmm0,%xmm8
-  DB  233,244,254,255,255                 ; jmpq          151 <_sk_load_8888_ssse3_lowp+0x15>
-  DB  15,31,0                             ; nopl          (%rax)
-  DB  237                                 ; in            (%dx),%eax
+  DB  233,244,254,255,255                 ; jmpq          1cc <_sk_load_8888_ssse3_lowp+0x15>
+  DB  240,255                             ; lock          (bad)
   DB  255                                 ; (bad)
   DB  255                                 ; (bad)
+  DB  219,255                             ; (bad)
   DB  255                                 ; (bad)
-  DB  216,255                             ; fdivr         %st(7),%st
+  DB  255,202                             ; dec           %edx
   DB  255                                 ; (bad)
-  DB  255,199                             ; inc           %edi
   DB  255                                 ; (bad)
   DB  255                                 ; (bad)
-  DB  255,182,255,255,255,170             ; pushq         -0x55000001(%rsi)
+  DB  185,255,255,255,173                 ; mov           $0xadffffff,%ecx
   DB  255                                 ; (bad)
   DB  255                                 ; (bad)
-  DB  255,149,255,255,255,132             ; callq         *-0x7b000001(%rbp)
+  DB  255,152,255,255,255,135             ; lcall         *-0x78000001(%rax)
   DB  255                                 ; (bad)
   DB  255                                 ; (bad)
   DB  255                                 ; .byte         0xff
@@ -26460,7 +26489,7 @@ _sk_store_8888_ssse3_lowp LABEL PROC
   DB  102,69,15,97,194                    ; punpcklwd     %xmm10,%xmm8
   DB  102,69,15,105,202                   ; punpckhwd     %xmm10,%xmm9
   DB  77,133,192                          ; test          %r8,%r8
-  DB  117,17                              ; jne           2eb <_sk_store_8888_ssse3_lowp+0x6f>
+  DB  117,17                              ; jne           363 <_sk_store_8888_ssse3_lowp+0x6f>
   DB  243,69,15,127,76,147,16             ; movdqu        %xmm9,0x10(%r11,%rdx,4)
   DB  243,69,15,127,4,147                 ; movdqu        %xmm8,(%r11,%rdx,4)
   DB  72,173                              ; lods          %ds:(%rsi),%rax
@@ -26469,9 +26498,9 @@ _sk_store_8888_ssse3_lowp LABEL PROC
   DB  65,128,225,7                        ; and           $0x7,%r9b
   DB  65,254,201                          ; dec           %r9b
   DB  65,128,249,6                        ; cmp           $0x6,%r9b
-  DB  119,236                             ; ja            2e7 <_sk_store_8888_ssse3_lowp+0x6b>
+  DB  119,236                             ; ja            35f <_sk_store_8888_ssse3_lowp+0x6b>
   DB  69,15,182,201                       ; movzbl        %r9b,%r9d
-  DB  76,141,21,90,0,0,0                  ; lea           0x5a(%rip),%r10        # 360 <_sk_store_8888_ssse3_lowp+0xe4>
+  DB  76,141,21,90,0,0,0                  ; lea           0x5a(%rip),%r10        # 3d8 <_sk_store_8888_ssse3_lowp+0xe4>
   DB  75,99,4,138                         ; movslq        (%r10,%r9,4),%rax
   DB  76,1,208                            ; add           %r10,%rax
   DB  255,224                             ; jmpq          *%rax
@@ -26487,7 +26516,7 @@ _sk_store_8888_ssse3_lowp LABEL PROC
   DB  102,69,15,112,200,229               ; pshufd        $0xe5,%xmm8,%xmm9
   DB  102,69,15,126,76,147,4              ; movd          %xmm9,0x4(%r11,%rdx,4)
   DB  102,69,15,126,4,147                 ; movd          %xmm8,(%r11,%rdx,4)
-  DB  235,136                             ; jmp           2e7 <_sk_store_8888_ssse3_lowp+0x6b>
+  DB  235,136                             ; jmp           35f <_sk_store_8888_ssse3_lowp+0x6b>
   DB  144                                 ; nop
   DB  247,255                             ; idiv          %edi
   DB  255                                 ; (bad)
@@ -26518,6 +26547,23 @@ _sk_swap_rb_ssse3_lowp LABEL PROC
   DB  65,15,40,208                        ; movaps        %xmm8,%xmm2
   DB  255,224                             ; jmpq          *%rax
 
+PUBLIC _sk_swap_ssse3_lowp
+_sk_swap_ssse3_lowp LABEL PROC
+  DB  68,15,40,195                        ; movaps        %xmm3,%xmm8
+  DB  68,15,40,202                        ; movaps        %xmm2,%xmm9
+  DB  68,15,40,209                        ; movaps        %xmm1,%xmm10
+  DB  68,15,40,216                        ; movaps        %xmm0,%xmm11
+  DB  72,173                              ; lods          %ds:(%rsi),%rax
+  DB  15,40,196                           ; movaps        %xmm4,%xmm0
+  DB  15,40,205                           ; movaps        %xmm5,%xmm1
+  DB  15,40,214                           ; movaps        %xmm6,%xmm2
+  DB  15,40,223                           ; movaps        %xmm7,%xmm3
+  DB  65,15,40,227                        ; movaps        %xmm11,%xmm4
+  DB  65,15,40,234                        ; movaps        %xmm10,%xmm5
+  DB  65,15,40,241                        ; movaps        %xmm9,%xmm6
+  DB  65,15,40,248                        ; movaps        %xmm8,%xmm7
+  DB  255,224                             ; jmpq          *%rax
+
 PUBLIC _sk_move_src_dst_ssse3_lowp
 _sk_move_src_dst_ssse3_lowp LABEL PROC
   DB  72,173                              ; lods          %ds:(%rsi),%rax
@@ -26527,9 +26573,18 @@ _sk_move_src_dst_ssse3_lowp LABEL PROC
   DB  15,40,251                           ; movaps        %xmm3,%xmm7
   DB  255,224                             ; jmpq          *%rax
 
+PUBLIC _sk_move_dst_src_ssse3_lowp
+_sk_move_dst_src_ssse3_lowp LABEL PROC
+  DB  72,173                              ; lods          %ds:(%rsi),%rax
+  DB  15,40,196                           ; movaps        %xmm4,%xmm0
+  DB  15,40,205                           ; movaps        %xmm5,%xmm1
+  DB  15,40,214                           ; movaps        %xmm6,%xmm2
+  DB  15,40,223                           ; movaps        %xmm7,%xmm3
+  DB  255,224                             ; jmpq          *%rax
+
 PUBLIC _sk_srcover_ssse3_lowp
 _sk_srcover_ssse3_lowp LABEL PROC
-  DB  102,68,15,111,5,124,0,0,0           ; movdqa        0x7c(%rip),%xmm8        # 420 <_sk_srcover_ssse3_lowp+0x85>
+  DB  102,68,15,111,5,132,0,0,0           ; movdqa        0x84(%rip),%xmm8        # 4e0 <_sk_srcover_ssse3_lowp+0x8d>
   DB  102,68,15,249,195                   ; psubw         %xmm3,%xmm8
   DB  102,68,15,111,204                   ; movdqa        %xmm4,%xmm9
   DB  102,69,15,56,11,200                 ; pmulhrsw      %xmm8,%xmm9
@@ -26549,6 +26604,11 @@ _sk_srcover_ssse3_lowp LABEL PROC
   DB  72,173                              ; lods          %ds:(%rsi),%rax
   DB  255,224                             ; jmpq          *%rax
 
+ALIGN 4
+  DB  0,0                                 ; add           %al,(%rax)
+  DB  0                                   ; .byte         0x0
+  DB  71                                  ; rex.RXB
+
 ALIGN 16
   DB  0,4,8                               ; add           %al,(%rax,%rcx,1)
   DB  12,1                                ; or            $0x1,%al
diff --git a/src/jumper/SkJumper_stages_lowp.cpp b/src/jumper/SkJumper_stages_lowp.cpp
index 139382377d..987bfa6518 100644
--- a/src/jumper/SkJumper_stages_lowp.cpp
+++ b/src/jumper/SkJumper_stages_lowp.cpp
@@ -165,6 +165,14 @@ SI U32 to_8888(F r, F g, F b, F a) {
 
 // Stages!
 
+STAGE(constant_color) {
+    auto rgba = (const float*)ctx;
+    r = rgba[0];
+    g = rgba[1];
+    b = rgba[2];
+    a = rgba[3];
+}
+
 STAGE(load_8888) {
     auto ptr = *(const uint32_t**)ctx + x;
     from_8888(load<U32>(ptr, tail), &r,&g,&b,&a);
@@ -180,12 +188,29 @@ STAGE(swap_rb) {
     b = tmp;
 }
 
+STAGE(swap) {
+    auto swap = [](F& v, F& dv) {
+        auto tmp = v;
+        v = dv;
+        dv = tmp;
+    };
+    swap(r, dr);
+    swap(g, dg);
+    swap(b, db);
+    swap(a, da);
+}
 STAGE(move_src_dst) {
     dr = r;
     dg = g;
     db = b;
     da = a;
 }
+STAGE(move_dst_src) {
+    r = dr;
+    g = dg;
+    b = db;
+    a = da;
+}
 
 // Most blend modes apply the same logic to each channel.
 #define BLEND_MODE(name)                       \