Checkpoint commit: Preliminary version of a facility to emit x86/sse code

to implement vertex emit functions for the t_vertex.c mechanism.

1 files changed, 937 insertions, 0 deletions

diff --git a/src/mesa/tnl/t_vertex_sse.c b/src/mesa/tnl/t_vertex_sse.c
new file mode 100644
index 00000000000..b4e2c5b4748
--- /dev/null
+++ b/src/mesa/tnl/t_vertex_sse.c
@@ -0,0 +1,937 @@
+/*
+ * Copyright 2003 Tungsten Graphics, inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
+ * TUNGSTEN GRAPHICS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Keith Whitwell <[email protected]>
+ */
+
+#include "glheader.h"
+#include "context.h"
+#include "colormac.h"
+#include "t_context.h"
+#include "t_vertex.h"
+#include "simple_list.h"
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define X    0
+#define Y    1
+#define Z    2
+#define W    3
+
+struct x86_reg {
+   GLuint file:3;
+   GLuint idx:3;
+   GLuint mod:2;		/* mod_REG if this is just a register */
+   GLint  disp:24;		/* only +/- 23bits of offset - should be enough... */
+};
+
+struct x86_program {
+   GLcontext *ctx;
+   
+   GLubyte *store;
+   GLubyte *csr;
+
+   GLuint stack_offset;
+
+   GLboolean inputs_safe;
+   GLboolean outputs_safe;
+   
+   struct x86_reg identity;
+   struct x86_reg vp0;
+   struct x86_reg vp1;
+};
+
+
+#define X86_TWOB 0x0f
+
+/* There are more but these are all we'll use:
+ */
+enum x86_reg_file {
+   file_REG32,
+   file_XMM
+};
+
+/* Values for mod field of modr/m byte
+ */
+enum x86_reg_mod {
+   mod_INDIRECT,
+   mod_DISP8,
+   mod_DISP32,
+   mod_REG
+};
+
+enum x86_reg_name {
+   reg_AX,
+   reg_CX,
+   reg_DX,
+   reg_BX,
+   reg_SP,
+   reg_BP,
+   reg_SI,
+   reg_DI
+};
+
+
+enum x86_cc {
+   cc_O,			/* overflow */
+   cc_NO,			/* not overflow */
+   cc_NAE,			/* not above or equal / carry */
+   cc_AE,			/* above or equal / not carry */
+   cc_E,			/* equal / zero */
+   cc_NE			/* not equal / not zero */
+};
+
+#define cc_Z  cc_E
+#define cc_NZ cc_NE
+
+
+/* Create and manipulate registers and regmem values:
+ */
+static struct x86_reg make_reg( GLuint file,
+				GLuint idx )
+{
+   struct x86_reg reg;
+
+   reg.file = file;
+   reg.idx = idx;
+   reg.mod = mod_REG;
+   reg.disp = 0;
+
+   return reg;
+}
+
+static struct x86_reg make_disp( struct x86_reg reg,
+				 GLint disp )
+{
+   assert(reg.file == file_REG32);
+
+   if (reg.mod == mod_REG)
+      reg.disp = disp;
+   else
+      reg.disp += disp;
+
+   if (reg.disp == 0)
+      reg.mod = mod_INDIRECT;
+   else if (reg.disp <= 127 && reg.disp >= -128)
+      reg.mod = mod_DISP8;
+   else
+      reg.mod = mod_DISP32;
+
+   return reg;
+}
+
+/* Retreive a reference to one of the function arguments, taking into
+ * account any push/pop activity:
+ */
+static struct x86_reg make_fn_arg( struct x86_program *p,
+				   GLuint arg )
+{
+   return make_disp(make_reg(file_REG32, reg_SP), 
+		    p->stack_offset + arg * 4);	/* ??? */
+}
+
+
+static struct x86_reg get_identity( struct x86_program *p )
+{
+   return p->identity;
+}
+
+static struct x86_reg get_sse_temp( struct x86_program *p )
+{
+   return make_reg(file_XMM, 7); /* hardwired */
+}
+
+static void release_temp( struct x86_program *p,
+			  struct x86_reg reg )
+{
+   assert(reg.file == file_XMM &&
+	  reg.idx == 7);
+}
+
+/* Emit bytes to the instruction stream:
+ */
+static void emit_1b( struct x86_program *p, GLbyte b0 )
+{
+   *(GLbyte *)(p->csr++) = b0;
+}
+
+static void emit_1ub( struct x86_program *p, GLubyte b0 )
+{
+   *(p->csr++) = b0;
+}
+
+static void emit_2ub( struct x86_program *p, GLubyte b0, GLubyte b1 )
+{
+   *(p->csr++) = b0;
+   *(p->csr++) = b1;
+}
+
+static void emit_3ub( struct x86_program *p, GLubyte b0, GLubyte b1, GLubyte b2 )
+{
+   *(p->csr++) = b0;
+   *(p->csr++) = b1;
+   *(p->csr++) = b2;
+}
+
+static void emit_1i( struct x86_program *p, GLint i0 )
+{
+   *(GLint *)(p->csr) = i0;
+   p->csr += 4;
+}
+
+
+/* Labels, jumps and fixup:
+ */
+static GLubyte *get_label( struct x86_program *p )
+{
+   return p->csr;
+}
+
+static void emit_jcc( struct x86_program *p,
+		      GLuint cc,
+		      GLubyte *label )
+{
+   GLint offset = label - (get_label(p) + 2);
+
+   if (offset <= 127 && offset >= -128) {
+      emit_1ub(p, 0x70 + cc);
+      emit_1b(p, (GLbyte) offset);
+   }
+   else {
+      offset = label - (get_label(p) + 5);
+      emit_2ub(p, 0x0f, 0x80 + cc);
+      emit_1i(p, offset);
+   }
+}
+
+/* Always use a 32bit offset for forward jumps:
+ */
+static GLubyte *emit_jcc_forward( struct x86_program *p,
+			       GLuint cc )
+{
+   emit_2ub(p, 0x0f, 0x80 + cc);
+   emit_1i(p, 0);
+   return get_label(p);
+}
+
+/* Fixup offset from forward jump:
+ */
+static void do_fixup( struct x86_program *p,
+		      GLubyte *fixup )
+{
+   *(int *)(fixup - 4) = get_label(p) - fixup;
+}
+
+static void emit_push( struct x86_program *p,
+		       struct x86_reg reg )
+{
+   assert(reg.mod == mod_REG);
+   emit_1ub(p, 0x50 + reg.idx);
+   p->stack_offset += 4;
+}
+
+static void emit_pop( struct x86_program *p,
+		       struct x86_reg reg )
+{
+   assert(reg.mod == mod_REG);
+   emit_1ub(p, 0x58 + reg.idx);
+   p->stack_offset -= 4;
+}
+
+static void emit_inc( struct x86_program *p,
+		       struct x86_reg reg )
+{
+   assert(reg.mod == mod_REG);
+   emit_1ub(p, 0x40 + reg.idx);
+}
+
+static void emit_dec( struct x86_program *p,
+		       struct x86_reg reg )
+{
+   assert(reg.mod == mod_REG);
+   emit_1ub(p, 0x40 + reg.idx);
+}
+
+static void emit_ret( struct x86_program *p )
+{
+   emit_1ub(p, 0xc3);
+}
+
+
+
+
+/* Build a modRM byte + possible displacement.  No treatment of SIB
+ * indexing.  BZZT - no way to encode an absolute address.
+ */
+static void emit_modrm( struct x86_program *p, 
+			struct x86_reg reg, 
+			struct x86_reg regmem )
+{
+   GLubyte val = 0;
+   
+   assert(reg.mod == mod_REG);
+   
+   val |= regmem.mod << 6;     	/* mod field */
+   val |= reg.idx << 3;		/* reg field */
+   val |= regmem.idx;		/* r/m field */
+   
+   emit_1ub(p, val);
+
+   switch (regmem.mod) {
+   case mod_REG:
+   case mod_INDIRECT:
+      break;
+   case mod_DISP8:
+      emit_1b(p, regmem.disp);
+   case mod_DISP32:
+      emit_1i(p, regmem.disp);
+   }
+}
+
+/* Many x86 instructions have two opcodes to cope with the situations
+ * where the destination is a register or memory reference
+ * respectively.  This function selects the correct opcode based on
+ * the arguments presented.
+ */
+static void emit_op_modrm( struct x86_program *p,
+			   GLubyte op_dst_is_reg, 
+			   GLubyte op_dst_is_mem,
+			   struct x86_reg dst,
+			   struct x86_reg src )
+{
+   switch (dst.mod) {
+   case mod_REG:
+      emit_1ub(p, op_dst_is_reg);
+      emit_modrm(p, dst, src);
+      break;
+   case mod_INDIRECT:
+   case mod_DISP32:
+   case mod_DISP8:
+      assert(src.mod == mod_REG);
+      emit_1ub(p, op_dst_is_mem);
+      emit_modrm(p, src, dst);
+      break;
+   }
+}
+
+static void emit_mov( struct x86_program *p,
+		      struct x86_reg dst,
+		      struct x86_reg src )
+{
+   emit_op_modrm( p, 0x8b, 0x89, dst, src );
+}
+
+static void emit_xor( struct x86_program *p,
+		      struct x86_reg dst,
+		      struct x86_reg src )
+{
+   emit_op_modrm( p, 0x33, 0x31, dst, src );
+}
+
+static void emit_movlps( struct x86_program *p,
+			 struct x86_reg dst,
+			 struct x86_reg src )
+{
+   emit_1ub(p, X86_TWOB);
+   emit_op_modrm( p, 0x12, 0x13, dst, src );
+}
+
+static void emit_movhps( struct x86_program *p,
+			 struct x86_reg dst,
+			 struct x86_reg src )
+{
+   emit_1ub(p, X86_TWOB);
+   emit_op_modrm( p, 0x16, 0x17, dst, src );
+}
+
+static void emit_movd( struct x86_program *p,
+		       struct x86_reg dst,
+		       struct x86_reg src )
+{
+   emit_2ub(p, 0x66, X86_TWOB);
+   emit_op_modrm( p, 0x6e, 0x7e, dst, src );
+}
+
+static void emit_movss( struct x86_program *p,
+		       struct x86_reg dst,
+		       struct x86_reg src )
+{
+   emit_2ub(p, 0xF3, X86_TWOB);
+   emit_op_modrm( p, 0x10, 0x11, dst, src );
+}
+
+static void emit_movaps( struct x86_program *p,
+			 struct x86_reg dst,
+			 struct x86_reg src )
+{
+   emit_1ub(p, X86_TWOB);
+   emit_op_modrm( p, 0x28, 0x29, dst, src );
+}
+
+static void emit_movups( struct x86_program *p,
+			 struct x86_reg dst,
+			 struct x86_reg src )
+{
+   emit_1ub(p, X86_TWOB);
+   emit_op_modrm( p, 0x10, 0x11, dst, src );
+}
+
+/* SSE operations often only have one format, with dest constrained to
+ * be a register:
+ */
+static void emit_mulps( struct x86_program *p,
+			struct x86_reg dst,
+			struct x86_reg src )
+{
+   emit_2ub(p, X86_TWOB, 0x59);
+   emit_modrm( p, dst, src );
+}
+
+static void emit_addps( struct x86_program *p,
+			struct x86_reg dst,
+			struct x86_reg src )
+{
+   emit_2ub(p, X86_TWOB, 0x58);
+   emit_modrm( p, dst, src );
+}
+
+static void emit_cvtps2dq( struct x86_program *p,
+			struct x86_reg dst,
+			struct x86_reg src )
+{
+   emit_3ub(p, 0x66, X86_TWOB, 0x5B);
+   emit_modrm( p, dst, src );
+}
+
+static void emit_packssdw( struct x86_program *p,
+			struct x86_reg dst,
+			struct x86_reg src )
+{
+   emit_3ub(p, 0x66, X86_TWOB, 0x6B);
+   emit_modrm( p, dst, src );
+}
+
+static void emit_packsswb( struct x86_program *p,
+			struct x86_reg dst,
+			struct x86_reg src )
+{
+   emit_3ub(p, 0x66, X86_TWOB, 0x63);
+   emit_modrm( p, dst, src );
+}
+
+/* Load effective address:
+ */
+static void emit_lea( struct x86_program *p,
+		      struct x86_reg dst,
+		      struct x86_reg src )
+{
+   emit_1ub(p, 0x8d);
+   emit_modrm( p, dst, src );
+}
+
+static void emit_add_imm( struct x86_program *p,
+			  struct x86_reg dst,
+			  struct x86_reg src,
+			  GLint value )
+{
+   emit_lea(p, dst, make_disp(src, value));
+}
+
+
+
+
+/**
+ * Perform a reduced swizzle:
+ */
+static void emit_pshufd( struct x86_program *p,
+			 struct x86_reg dest,
+			 struct x86_reg arg0,
+			 GLubyte x,
+			 GLubyte y,
+			 GLubyte z,
+			 GLubyte w) 
+{
+   emit_3ub(p, 0x66, X86_TWOB, 0x70);
+   emit_modrm(p, dest, arg0);
+   emit_1ub(p, (x|(y<<2)|(z<<4)|w<<6)); 
+}
+
+
+static void emit_pk4ub( struct x86_program *p, 
+			struct x86_reg dest,
+			struct x86_reg arg0 )
+{
+   emit_cvtps2dq(p, dest, arg0);
+   emit_packssdw(p, dest, dest);
+   emit_packsswb(p, dest, dest);
+}
+
+static void emit_load4f_4( struct x86_program *p, 			   
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   emit_movups(p, dest, arg0);
+}
+
+static void emit_load4f_3( struct x86_program *p, 
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   /* Have to jump through some hoops:
+    *
+    * 0 0 0 1 -- skip if reg[3] preserved over loop iterations
+    * c 0 0 1
+    * 0 0 c 1
+    * a b c 1 
+    */
+   emit_movups(p, dest, get_identity(p));
+   emit_movss(p, dest, make_disp(arg0, 8));
+   emit_pshufd(p, dest, dest, Y,Z,X,W );
+   emit_movlps(p, dest, arg0);
+}
+
+static void emit_load4f_2( struct x86_program *p, 
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   /* Pull in 2 dwords, then copy the top 2 dwords with 0,1 from id.
+    */
+   emit_movlps(p, dest, arg0);
+   emit_movhps(p, dest, get_identity(p));
+}
+
+static void emit_load4f_1( struct x86_program *p, 
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   /* Initialized with [0,0,0,1] from id, then pull in the single low
+    * word.
+    */
+   emit_movaps(p, dest, get_identity(p));
+   emit_movss(p, dest, arg0);
+}
+
+
+
+static void emit_load3f_3( struct x86_program *p, 			   
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   /* Over-reads by 1 dword - potential SEGV...  Deal with in
+    * array_cache by treating size-3 arrays specially, copying to
+    * temporary storage if last element (how can you tell?) falls on a
+    * 4k boundary.
+    */
+   if (p->inputs_safe) {
+      emit_movaps(p, dest, arg0);
+   } 
+   else {
+      /* c . . .
+       * c c c c
+       * a b c c 
+       */
+      emit_movss(p, dest, make_disp(arg0, 8));
+      emit_pshufd(p, dest, dest, X,X,X,X);
+      emit_movlps(p, dest, arg0);
+   }
+}
+
+static void emit_load3f_2( struct x86_program *p, 
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   emit_load4f_2(p, dest, arg0);
+}
+
+static void emit_load3f_1( struct x86_program *p, 
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   emit_load4f_1(p, dest, arg0);
+}
+
+static void emit_load2f_2( struct x86_program *p, 
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   emit_movlps(p, dest, arg0);
+}
+
+static void emit_load2f_1( struct x86_program *p, 
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   emit_load4f_1(p, dest, arg0);
+}
+
+static void emit_load1f_1( struct x86_program *p, 
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   emit_movss(p, dest, arg0);
+}
+
+static void (*load[4][4])( struct x86_program *p, 
+			   struct x86_reg dest,
+			   struct x86_reg arg0 ) = {
+   { emit_load1f_1, 
+     emit_load1f_1, 
+     emit_load1f_1, 
+     emit_load1f_1 },
+
+   { emit_load2f_1, 
+     emit_load2f_2, 
+     emit_load2f_2, 
+     emit_load2f_2 },
+
+   { emit_load3f_1, 
+     emit_load3f_2, 
+     emit_load3f_3, 
+     emit_load3f_3 },
+
+   { emit_load4f_1, 
+     emit_load4f_2, 
+     emit_load4f_3, 
+     emit_load4f_4 } 
+};
+
+static void emit_load( struct x86_program *p,
+		       struct x86_reg temp,
+		       GLuint sz,
+		       struct x86_reg src,
+		       GLuint src_sz)
+{
+   load[sz-1][src_sz-1](p, temp, src);
+}
+
+
+static void emit_store4f( struct x86_program *p, 			   
+			  struct x86_reg dest,
+			  struct x86_reg arg0 )
+{
+   emit_movups(p, dest, arg0);
+}
+
+static void emit_store3f( struct x86_program *p, 
+			  struct x86_reg dest,
+			  struct x86_reg arg0 )
+{
+   if (p->outputs_safe) {
+      /* Emit the extra dword anyway.  This may hurt writecombining,
+       * may cause other problems.
+       */
+      emit_movups(p, dest, arg0);
+   }
+   else {
+      /* Alternate strategy - emit two, shuffle, emit one.
+       */
+      struct x86_reg tmp = get_sse_temp(p);
+      emit_movlps(p, dest, arg0);
+
+      emit_pshufd(p, tmp, arg0, Z, Z, Z, Z );
+      emit_movss(p, make_disp(dest,8), tmp);
+      release_temp(p, tmp);
+   }
+}
+
+static void emit_store2f( struct x86_program *p, 
+			   struct x86_reg dest,
+			   struct x86_reg arg0 )
+{
+   emit_movlps(p, dest, arg0);
+}
+
+static void emit_store1f( struct x86_program *p, 
+			  struct x86_reg dest,
+			  struct x86_reg arg0 )
+{
+   emit_movss(p, dest, arg0);
+}
+
+
+static void (*store[4])( struct x86_program *p, 
+			 struct x86_reg dest,
+			 struct x86_reg arg0 ) = 
+{
+   emit_store1f, 
+   emit_store2f, 
+   emit_store3f, 
+   emit_store4f 
+};
+
+static void emit_store( struct x86_program *p,
+			struct x86_reg dest,
+			GLuint sz,
+			struct x86_reg temp )
+
+{
+   store[sz-1](p, dest, temp);
+}
+
+
+static GLint get_offset( const void *a, const void *b )
+{
+   return (const char *)b - (const char *)a;
+}
+
+
+
+/* Lots of hardcoding
+ *
+ * EAX -- pointer to current output vertex
+ * ECX -- pointer to current attribute 
+ * 
+ */
+static GLboolean build_vertex_emit( struct x86_program *p )
+{
+   GLcontext *ctx = p->ctx;
+   TNLcontext *tnl = TNL_CONTEXT(ctx);
+   struct tnl_clipspace *vtx = GET_VERTEX_STATE(ctx);
+   struct tnl_clipspace_attr *a = vtx->attr;
+   GLuint j;
+
+   struct x86_reg vertexEAX = make_reg(file_REG32, reg_AX);
+   struct x86_reg srcEDI = make_reg(file_REG32, reg_CX);
+   struct x86_reg countEBP = make_reg(file_REG32, reg_BP);
+   struct x86_reg vtxESI = make_reg(file_REG32, reg_SI);
+   struct x86_reg tmp = make_reg(file_XMM, 0);
+   struct x86_reg vp0 = make_reg(file_XMM, 1);
+   struct x86_reg vp1 = make_reg(file_XMM, 2);
+   GLubyte *fixup, *label;
+
+   p->csr = p->store;
+   
+   /* Push a few regs?
+    */
+   emit_push(p, srcEDI);
+   emit_push(p, countEBP);
+   emit_push(p, vtxESI);
+
+   /* Initialize destination register. 
+    */
+   emit_mov(p, vertexEAX, make_fn_arg(p, 3));
+
+   /* Dereference ctx to get tnl, then vtx:
+    */
+   emit_mov(p, vtxESI, make_fn_arg(p, 1));
+   emit_mov(p, vtxESI, make_disp(vtxESI, get_offset(ctx, &ctx->swtnl_context)));
+   vtxESI = make_disp(vtxESI, get_offset(tnl, &tnl->clipspace));
+
+   /* Get vertex count, compare to zero
+    */
+   emit_mov(p, countEBP, make_fn_arg(p, 2));
+   fixup = emit_jcc_forward(p, cc_NZ);
+   
+   /* Possibly load vp0, vp1 for viewport calcs:
+    */
+   if (vtx->need_viewport) {
+      emit_movups(p, vp0, make_disp(vtxESI, get_offset(vtx, &vtx->vp_scale[0])));
+      emit_movups(p, vp1, make_disp(vtxESI, get_offset(vtx, &vtx->vp_xlate[0])));
+   }
+
+   /* Note address for loop jump */
+   label = get_label(p);
+
+   /* Emit code for each of the attributes.  Currently routes
+    * everything through SSE registers, even when it might be more
+    * efficient to stick with regular old x86.  No optimization or
+    * other tricks - enough new ground to cover here just getting
+    * things working.
+    */
+   for (j = 0; j < vtx->attr_count; j++) {
+      struct x86_reg dest = make_disp(vertexEAX, vtx->attr[j].vertoffset);
+      struct x86_reg ptr_to_src = make_disp(vtxESI, get_offset(vtx, &vtx->attr[j].inputptr));
+
+      /* Load current a[j].inputptr
+       */
+      emit_mov(p, srcEDI, ptr_to_src);
+
+      /* Now, load an XMM reg from src, perhaps transform, then save.
+       * Could be shortcircuited in specific cases:
+       */
+      switch (a[j].format) {
+      case EMIT_1F:
+	 emit_load(p, tmp, 1, srcEDI, vtx->attr[j].inputsize);
+	 emit_store(p, dest, 1, tmp);
+      case EMIT_2F:
+	 emit_load(p, tmp, 2, srcEDI, vtx->attr[j].inputsize);
+	 emit_store(p, dest, 2, tmp);
+      case EMIT_3F:
+	 /* Potentially the worst case - hardcode 2+1 copying:
+	  */
+	 emit_load(p, tmp, 3, srcEDI, vtx->attr[j].inputsize);
+	 emit_store(p, dest, 3, tmp);
+      case EMIT_4F:
+	 emit_load(p, tmp, 4, srcEDI, vtx->attr[j].inputsize);
+	 emit_store(p, dest, 4, tmp);
+	 break;
+      case EMIT_2F_VIEWPORT: 
+	 emit_load(p, tmp, 2, srcEDI, vtx->attr[j].inputsize);
+	 emit_mulps(p, dest, vp0);
+	 emit_addps(p, dest, vp1);
+	 emit_store(p, dest, 2, tmp);
+	 break;
+      case EMIT_3F_VIEWPORT: 
+	 emit_load(p, tmp, 3, srcEDI, vtx->attr[j].inputsize);
+	 emit_mulps(p, dest, vp0);
+	 emit_addps(p, dest, vp1);
+	 emit_store(p, dest, 3, tmp);
+	 break;
+      case EMIT_4F_VIEWPORT: 
+	 emit_load(p, tmp, 4, srcEDI, vtx->attr[j].inputsize);
+	 emit_mulps(p, dest, vp0);
+	 emit_addps(p, dest, vp1);
+	 emit_store(p, dest, 4, tmp);
+	 break;
+      case EMIT_3F_XYW:
+	 emit_load(p, tmp, 4, srcEDI, vtx->attr[j].inputsize);
+	 emit_pshufd(p, tmp, tmp, X, Y, W, Z);
+	 emit_store(p, dest, 3, tmp);
+	 break;
+
+	 /* Try and bond 3ub + 1ub pairs into a single 4ub operation?
+	  */	 
+      case EMIT_1UB_1F:	 
+      case EMIT_3UB_3F_RGB:
+      case EMIT_3UB_3F_BGR:
+	 return GL_FALSE;	/* add this later */
+
+      case EMIT_4UB_4F_RGBA:
+	 emit_load(p, tmp, 4, srcEDI, vtx->attr[j].inputsize);
+	 emit_pk4ub(p, tmp, tmp);
+	 emit_store(p, dest, 1, tmp);
+	 break;
+      case EMIT_4UB_4F_BGRA:
+	 emit_load(p, tmp, 4, srcEDI, vtx->attr[j].inputsize);
+	 emit_pshufd(p, tmp, tmp, Z, Y, X, W);
+	 emit_pk4ub(p, tmp, tmp);
+	 emit_store(p, dest, 1, tmp);
+	 break;
+      case EMIT_4UB_4F_ARGB:
+	 emit_load(p, tmp, 4, srcEDI, vtx->attr[j].inputsize);
+	 emit_pshufd(p, tmp, tmp, W, X, Y, Z);
+	 emit_pk4ub(p, tmp, tmp);
+	 emit_store(p, dest, 1, tmp);
+	 break;
+      case EMIT_4UB_4F_ABGR:
+	 emit_load(p, tmp, 4, srcEDI, vtx->attr[j].inputsize);
+	 emit_pshufd(p, tmp, tmp, W, Z, Y, X);
+	 emit_pk4ub(p, tmp, tmp);
+	 emit_store(p, dest, 1, tmp);
+	 break;
+      case EMIT_4CHAN_4F_RGBA:
+	 switch (CHAN_TYPE) {
+	 case GL_UNSIGNED_BYTE:
+	    emit_load(p, tmp, 4, srcEDI, vtx->attr[j].inputsize);
+	    emit_pk4ub(p, tmp, tmp);
+	    emit_store(p, dest, 1, tmp);
+	    break;
+	 case GL_UNSIGNED_SHORT:
+	    return GL_FALSE;
+	 case GL_FLOAT:
+	    emit_load(p, tmp, 4, srcEDI, vtx->attr[j].inputsize);
+	    emit_store(p, dest, 4, tmp);
+	    break;
+	 default:
+	    break;
+	 }
+      default:
+	 return GL_FALSE;	/* catch any new opcodes */
+      }
+      
+      /* add a[j].inputstride (hardcoded value - could just as easily
+       * pull the stride value from memory each time).
+       */
+      emit_add_imm(p, srcEDI, srcEDI, a[j].inputstride);
+      
+      /* save new value of a[j].inputptr 
+       */
+      emit_mov(p, ptr_to_src, srcEDI);
+
+   }
+
+   /* Next vertex:
+    */
+   emit_add_imm(p, vertexEAX, vertexEAX, vtx->vertex_size);
+
+   /* decr count, loop if not zero
+    */
+   emit_dec(p, countEBP);
+   emit_jcc(p, cc_NZ, label);
+
+   /* Land forward jump here:
+    */
+   do_fixup(p, fixup);
+
+   /* Pop regs and return
+    */
+   emit_pop(p, vtxESI);
+   emit_pop(p, countEBP);
+   emit_pop(p, srcEDI);
+   emit_ret(p);
+
+   vtx->emit = (tnl_emit_func)p->store;
+   return GL_TRUE;
+}
+
+void _tnl_generate_sse_emit( GLcontext *ctx )
+{
+   struct tnl_clipspace *vtx = GET_VERTEX_STATE(ctx);
+   struct x86_program p;
+
+   memset(&p, 0, sizeof(p));
+   p.ctx = ctx;
+   p.store = MALLOC(1024);
+
+   p.inputs_safe = 1;		/* for now */
+   p.outputs_safe = 1;		/* for now */
+   
+   if (build_vertex_emit(&p)) {
+      _tnl_register_fastpath( vtx, GL_TRUE );
+
+      {
+	 static int i = 0;
+	 char filename[100];
+	 int fd;
+
+	 sprintf(filename, "fastpath%d.o", i); 
+	 fd = creat(filename, 0600);
+	 if (fd != -1) {
+	    write(fd, p.store, p.csr - p.store);
+	    close(fd);
+	    _mesa_printf("wrote %s\n", filename);
+	 }
+      }
+   }
+   else {
+      FREE(p.store);
+   }
+
+   (void)emit_movd;
+   (void)emit_inc;
+   (void)emit_xor;
+}