New asm instruction and IR_CLAMP node type to allow clamping to [0,1] with instruction saturate-write option. Not finished yet.

5 files changed, 356 insertions, 284 deletions

diff --git a/src/mesa/shader/slang/library/slang_common_builtin.gc b/src/mesa/shader/slang/library/slang_common_builtin.gc
index e4a55846b8..5a25bbc30b 100644
--- a/src/mesa/shader/slang/library/slang_common_builtin.gc
+++ b/src/mesa/shader/slang/library/slang_common_builtin.gc
@@ -977,51 +977,37 @@ vec4 max(const vec4 a, const float b)
 
 float clamp(const float val, const float minVal, const float maxVal)
 {
-   float t;
-   __asm vec4_max t, val, minVal;
-   __asm vec4_min __retVal.x, t, maxVal;
+   __asm vec4_clamp __retVal, val, minVal, maxVal;
 }
 
 vec2 clamp(const vec2 val, const float minVal, const float maxVal)
 {
-   vec2 t;
-   __asm vec4_max t.xy, val.xy, minVal.xx;
-   __asm vec4_min __retVal.xy, t.xy, maxVal.xx;
+   __asm vec4_clamp __retVal, val, minVal, maxVal;
 }
 
 vec3 clamp(const vec3 val, const float minVal, const float maxVal)
 {
-   vec3 t;
-   __asm vec4_max t.xyz, val.xyz, minVal.xxx;
-   __asm vec4_min __retVal.xyz, t.xyz, maxVal.xxx;
+   __asm vec4_clamp __retVal, val, minVal, maxVal;
 }
 
 vec4 clamp(const vec4 val, const float minVal, const float maxVal)
 {
-   vec4 t;
-   __asm vec4_max t, val, minVal.xxxx;
-   __asm vec4_min __retVal, t, maxVal.xxxx;
+   __asm vec4_clamp __retVal, val, minVal, maxVal;
 }
 
 vec2 clamp(const vec2 val, const vec2 minVal, const vec2 maxVal)
 {
-   vec2 t;
-   __asm vec4_max t.xy, val.xy, minVal.xy;
-   __asm vec4_min __retVal.xy, t.xy, maxVal.xxxx;
+   __asm vec4_clamp __retVal, val, minVal, maxVal;
 }
 
 vec3 clamp(const vec3 val, const vec3 minVal, const vec3 maxVal)
 {
-   vec3 t;
-   __asm vec4_max t.xyz, val.xyz, minVal.xyz;
-   __asm vec4_min __retVal.xyz, t.xyz, maxVal.xxxx;
+   __asm vec4_clamp __retVal, val, minVal, maxVal;
 }
 
 vec4 clamp(const vec4 val, const vec4 minVal, const vec4 maxVal)
 {
-   vec4 t;
-   __asm vec4_max t, val, minVal;
-   __asm vec4_min __retVal, t, maxVal;
+   __asm vec4_clamp __retVal, val, minVal, maxVal;
 }
 
 
diff --git a/src/mesa/shader/slang/library/slang_common_builtin_gc.h b/src/mesa/shader/slang/library/slang_common_builtin_gc.h
index e64f401115..ed59b07c76 100644
--- a/src/mesa/shader/slang/library/slang_common_builtin_gc.h
+++ b/src/mesa/shader/slang/library/slang_common_builtin_gc.h
@@ -422,268 +422,259 @@
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+100,0,18,115,117,109,0,59,120,0,0,18,118,0,59,120,0,0,18,118,0,59,121,0,0,0,4,118,101,99,52,95,115,
+110,101,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,115,117,109,0,59,120,0,0,17,48,0,48,0,0,0,
+0,0,1,0,1,0,97,110,121,0,1,1,0,3,118,0,0,0,1,3,2,0,9,1,115,117,109,0,0,0,4,118,101,99,52,95,97,100,
+100,0,18,115,117,109,0,59,120,0,0,18,118,0,59,120,0,0,18,118,0,59,121,0,0,0,4,118,101,99,52,95,97,
+100,100,0,18,115,117,109,0,59,120,0,0,18,115,117,109,0,59,120,0,0,18,118,0,59,122,0,0,0,4,118,101,
 99,52,95,115,110,101,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,115,117,109,0,59,120,0,0,17,
-48,0,48,0,0,0,0,0,1,0,1,0,97,110,121,0,1,1,0,3,118,0,0,0,1,3,2,0,9,1,115,117,109,0,0,0,4,118,101,
+48,0,48,0,0,0,0,0,1,0,1,0,97,110,121,0,1,1,0,4,118,0,0,0,1,3,2,0,9,1,115,117,109,0,0,0,4,118,101,
 99,52,95,97,100,100,0,18,115,117,109,0,59,120,0,0,18,118,0,59,120,0,0,18,118,0,59,121,0,0,0,4,118,
 101,99,52,95,97,100,100,0,18,115,117,109,0,59,120,0,0,18,115,117,109,0,59,120,0,0,18,118,0,59,122,
-0,0,0,4,118,101,99,52,95,115,110,101,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,115,117,109,
-0,59,120,0,0,17,48,0,48,0,0,0,0,0,1,0,1,0,97,110,121,0,1,1,0,4,118,0,0,0,1,3,2,0,9,1,115,117,109,0,
-0,0,4,118,101,99,52,95,97,100,100,0,18,115,117,109,0,59,120,0,0,18,118,0,59,120,0,0,18,118,0,59,
-121,0,0,0,4,118,101,99,52,95,97,100,100,0,18,115,117,109,0,59,120,0,0,18,115,117,109,0,59,120,0,0,
-18,118,0,59,122,0,0,0,4,118,101,99,52,95,97,100,100,0,18,115,117,109,0,59,120,0,0,18,115,117,109,0,
-59,120,0,0,18,118,0,59,119,0,0,0,4,118,101,99,52,95,115,110,101,0,18,95,95,114,101,116,86,97,108,0,
-59,120,0,0,18,115,117,109,0,59,120,0,0,17,48,0,48,0,0,0,0,0,1,0,1,0,97,108,108,0,1,1,0,10,118,0,0,
-0,1,3,2,0,9,1,112,114,111,100,0,0,0,4,118,101,99,52,95,109,117,108,116,105,112,108,121,0,18,112,
-114,111,100,0,59,120,0,0,18,118,0,59,120,0,0,18,118,0,59,121,0,0,0,4,118,101,99,52,95,115,110,101,
-0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,112,114,111,100,0,59,120,0,0,17,48,0,48,0,0,0,0,8,
-18,118,0,59,120,0,18,118,0,59,121,0,34,0,0,1,0,1,0,97,108,108,0,1,1,0,3,118,0,0,0,1,3,2,0,9,1,112,
-114,111,100,0,0,0,4,118,101,99,52,95,109,117,108,116,105,112,108,121,0,18,112,114,111,100,0,59,120,
-0,0,18,118,0,59,120,0,0,18,118,0,59,121,0,0,0,4,118,101,99,52,95,109,117,108,116,105,112,108,121,0,
-18,112,114,111,100,0,59,120,0,0,18,112,114,111,100,0,59,120,0,0,18,118,0,59,122,0,0,0,4,118,101,99,
-52,95,115,110,101,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,112,114,111,100,0,59,120,0,0,17,
-48,0,48,0,0,0,0,0,1,0,1,0,97,108,108,0,1,1,0,4,118,0,0,0,1,3,2,0,9,1,112,114,111,100,0,0,0,4,118,
-101,99,52,95,109,117,108,116,105,112,108,121,0,18,112,114,111,100,0,59,120,0,0,18,118,0,59,120,0,0,
-18,118,0,59,121,0,0,0,4,118,101,99,52,95,109,117,108,116,105,112,108,121,0,18,112,114,111,100,0,59,
-120,0,0,18,112,114,111,100,0,59,120,0,0,18,118,0,59,122,0,0,0,4,118,101,99,52,95,109,117,108,116,
-105,112,108,121,0,18,112,114,111,100,0,59,120,0,0,18,112,114,111,100,0,59,120,0,0,18,118,0,59,119,
-0,0,0,4,118,101,99,52,95,115,110,101,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,112,114,111,
-100,0,59,120,0,0,17,48,0,48,0,0,0,0,0,1,0,2,0,110,111,116,0,1,1,0,2,118,0,0,0,1,4,118,101,99,52,95,
-115,101,113,0,18,95,95,114,101,116,86,97,108,0,59,120,121,0,0,18,118,0,0,17,48,0,48,0,0,0,0,0,1,0,
-3,0,110,111,116,0,1,1,0,3,118,0,0,0,1,4,118,101,99,52,95,115,101,113,0,18,95,95,114,101,116,86,97,
-108,0,59,120,121,122,0,0,18,118,0,0,17,48,0,48,0,0,0,0,0,1,0,4,0,110,111,116,0,1,1,0,4,118,0,0,0,1,
-4,118,101,99,52,95,115,101,113,0,18,95,95,114,101,116,86,97,108,0,0,18,118,0,0,17,48,0,48,0,0,0,0,
-0,1,0,12,0,116,101,120,116,117,114,101,49,68,0,1,1,0,16,115,97,109,112,108,101,114,0,0,1,1,0,9,99,
-111,111,114,100,0,0,0,1,4,118,101,99,52,95,116,101,120,49,100,0,18,95,95,114,101,116,86,97,108,0,0,
-18,115,97,109,112,108,101,114,0,0,18,99,111,111,114,100,0,0,0,0,1,0,12,0,116,101,120,116,117,114,
-101,49,68,80,114,111,106,0,1,1,0,16,115,97,109,112,108,101,114,0,0,1,1,0,10,99,111,111,114,100,0,0,
-0,1,3,2,0,12,1,99,111,111,114,100,52,0,0,0,9,18,99,111,111,114,100,52,0,59,120,0,18,99,111,111,114,
-100,0,59,120,0,20,0,9,18,99,111,111,114,100,52,0,59,119,0,18,99,111,111,114,100,0,59,121,0,20,0,4,
-118,101,99,52,95,116,101,120,112,49,100,0,18,95,95,114,101,116,86,97,108,0,0,18,115,97,109,112,108,
-101,114,0,0,18,99,111,111,114,100,52,0,0,0,0,1,0,12,0,116,101,120,116,117,114,101,49,68,80,114,111,
-106,0,1,1,0,16,115,97,109,112,108,101,114,0,0,1,1,0,12,99,111,111,114,100,0,0,0,1,4,118,101,99,52,
-95,116,101,120,112,49,100,0,18,95,95,114,101,116,86,97,108,0,0,18,115,97,109,112,108,101,114,0,0,
-18,99,111,111,114,100,0,0,0,0,1,0,12,0,116,101,120,116,117,114,101,50,68,0,1,1,0,17,115,97,109,112,
+0,0,0,4,118,101,99,52,95,97,100,100,0,18,115,117,109,0,59,120,0,0,18,115,117,109,0,59,120,0,0,18,
+118,0,59,119,0,0,0,4,118,101,99,52,95,115,110,101,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,
+115,117,109,0,59,120,0,0,17,48,0,48,0,0,0,0,0,1,0,1,0,97,108,108,0,1,1,0,10,118,0,0,0,1,3,2,0,9,1,
+112,114,111,100,0,0,0,4,118,101,99,52,95,109,117,108,116,105,112,108,121,0,18,112,114,111,100,0,59,
+120,0,0,18,118,0,59,120,0,0,18,118,0,59,121,0,0,0,4,118,101,99,52,95,115,110,101,0,18,95,95,114,
+101,116,86,97,108,0,59,120,0,0,18,112,114,111,100,0,59,120,0,0,17,48,0,48,0,0,0,0,8,18,118,0,59,
+120,0,18,118,0,59,121,0,34,0,0,1,0,1,0,97,108,108,0,1,1,0,3,118,0,0,0,1,3,2,0,9,1,112,114,111,100,
+0,0,0,4,118,101,99,52,95,109,117,108,116,105,112,108,121,0,18,112,114,111,100,0,59,120,0,0,18,118,
+0,59,120,0,0,18,118,0,59,121,0,0,0,4,118,101,99,52,95,109,117,108,116,105,112,108,121,0,18,112,114,
+111,100,0,59,120,0,0,18,112,114,111,100,0,59,120,0,0,18,118,0,59,122,0,0,0,4,118,101,99,52,95,115,
+110,101,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,112,114,111,100,0,59,120,0,0,17,48,0,48,0,
+0,0,0,0,1,0,1,0,97,108,108,0,1,1,0,4,118,0,0,0,1,3,2,0,9,1,112,114,111,100,0,0,0,4,118,101,99,52,
+95,109,117,108,116,105,112,108,121,0,18,112,114,111,100,0,59,120,0,0,18,118,0,59,120,0,0,18,118,0,
+59,121,0,0,0,4,118,101,99,52,95,109,117,108,116,105,112,108,121,0,18,112,114,111,100,0,59,120,0,0,
+18,112,114,111,100,0,59,120,0,0,18,118,0,59,122,0,0,0,4,118,101,99,52,95,109,117,108,116,105,112,
+108,121,0,18,112,114,111,100,0,59,120,0,0,18,112,114,111,100,0,59,120,0,0,18,118,0,59,119,0,0,0,4,
+118,101,99,52,95,115,110,101,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,112,114,111,100,0,59,
+120,0,0,17,48,0,48,0,0,0,0,0,1,0,2,0,110,111,116,0,1,1,0,2,118,0,0,0,1,4,118,101,99,52,95,115,101,
+113,0,18,95,95,114,101,116,86,97,108,0,59,120,121,0,0,18,118,0,0,17,48,0,48,0,0,0,0,0,1,0,3,0,110,
+111,116,0,1,1,0,3,118,0,0,0,1,4,118,101,99,52,95,115,101,113,0,18,95,95,114,101,116,86,97,108,0,59,
+120,121,122,0,0,18,118,0,0,17,48,0,48,0,0,0,0,0,1,0,4,0,110,111,116,0,1,1,0,4,118,0,0,0,1,4,118,
+101,99,52,95,115,101,113,0,18,95,95,114,101,116,86,97,108,0,0,18,118,0,0,17,48,0,48,0,0,0,0,0,1,0,
+12,0,116,101,120,116,117,114,101,49,68,0,1,1,0,16,115,97,109,112,108,101,114,0,0,1,1,0,9,99,111,
+111,114,100,0,0,0,1,4,118,101,99,52,95,116,101,120,49,100,0,18,95,95,114,101,116,86,97,108,0,0,18,
+115,97,109,112,108,101,114,0,0,18,99,111,111,114,100,0,0,0,0,1,0,12,0,116,101,120,116,117,114,101,
+49,68,80,114,111,106,0,1,1,0,16,115,97,109,112,108,101,114,0,0,1,1,0,10,99,111,111,114,100,0,0,0,1,
+3,2,0,12,1,99,111,111,114,100,52,0,0,0,9,18,99,111,111,114,100,52,0,59,120,0,18,99,111,111,114,100,
+0,59,120,0,20,0,9,18,99,111,111,114,100,52,0,59,119,0,18,99,111,111,114,100,0,59,121,0,20,0,4,118,
+101,99,52,95,116,101,120,112,49,100,0,18,95,95,114,101,116,86,97,108,0,0,18,115,97,109,112,108,101,
+114,0,0,18,99,111,111,114,100,52,0,0,0,0,1,0,12,0,116,101,120,116,117,114,101,49,68,80,114,111,106,
+0,1,1,0,16,115,97,109,112,108,101,114,0,0,1,1,0,12,99,111,111,114,100,0,0,0,1,4,118,101,99,52,95,
+116,101,120,112,49,100,0,18,95,95,114,101,116,86,97,108,0,0,18,115,97,109,112,108,101,114,0,0,18,
+99,111,111,114,100,0,0,0,0,1,0,12,0,116,101,120,116,117,114,101,50,68,0,1,1,0,17,115,97,109,112,
 108,101,114,0,0,1,1,0,10,99,111,111,114,100,0,0,0,1,4,118,101,99,52,95,116,101,120,50,100,0,18,95,
 95,114,101,116,86,97,108,0,0,18,115,97,109,112,108,101,114,0,0,18,99,111,111,114,100,0,0,0,0,1,0,
 12,0,116,101,120,116,117,114,101,50,68,80,114,111,106,0,1,1,0,17,115,97,109,112,108,101,114,0,0,1,
diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c
index 9b932ca71b..cc2a0b2738 100644
--- a/src/mesa/shader/slang/slang_codegen.c
+++ b/src/mesa/shader/slang/slang_codegen.c
@@ -458,6 +458,7 @@ static slang_asm_info AsmInfo[] = {
    { "vec4_lrp", IR_LRP, 1, 3 },
    { "vec4_min", IR_MIN, 1, 2 },
    { "vec4_max", IR_MAX, 1, 2 },
+   { "vec4_clamp", IR_CLAMP, 1, 3 },
    { "vec4_seq", IR_SEQ, 1, 2 },
    { "vec4_sge", IR_SGE, 1, 2 },
    { "vec4_sgt", IR_SGT, 1, 2 },
@@ -1394,7 +1395,8 @@ _slang_gen_while(slang_assemble_ctx * A, const slang_operation *oper)
    tree = new_seq(tree, bra);
 
    body = _slang_gen_operation(A, &oper->children[1]);
-   tree = new_seq(tree, body);
+   if (body)
+      tree = new_seq(tree, body);
 
    jump = new_jump(startAtom);
    tree = new_seq(tree, jump);
@@ -2167,7 +2169,10 @@ _slang_gen_operation(slang_assemble_ctx * A, slang_operation *oper)
 
    case slang_oper_block_no_new_scope:
       /* list of operations */
+      /*
       assert(oper->num_children > 0);
+      */
+      if (oper->num_children > 0)
       {
          slang_ir_node *n, *tree = NULL;
          GLuint i;
@@ -2434,6 +2439,9 @@ _slang_gen_operation(slang_assemble_ctx * A, slang_operation *oper)
 
    case slang_oper_none:
       return NULL;
+   case slang_oper_void:
+      return NULL;
+
    default:
       printf("Unhandled node type %d\n", oper->type);
       abort();
diff --git a/src/mesa/shader/slang/slang_emit.c b/src/mesa/shader/slang/slang_emit.c
index 8e598bf660..1c945fa0ba 100644
--- a/src/mesa/shader/slang/slang_emit.c
+++ b/src/mesa/shader/slang/slang_emit.c
@@ -68,6 +68,7 @@ static slang_ir_info IrInfo[] = {
    { IR_LRP, "IR_LRP", OPCODE_LRP, 4, 3 },
    { IR_MIN, "IR_MIN", OPCODE_MIN, 4, 2 },
    { IR_MAX, "IR_MAX", OPCODE_MAX, 4, 2 },
+   { IR_CLAMP, "IR_CLAMP", OPCODE_NOP, 4, 3 }, /* special case: emit_clamp() */
    { IR_SEQUAL, "IR_SEQUAL", OPCODE_SEQ, 4, 2 },
    { IR_SNEQUAL, "IR_SNEQUAL", OPCODE_SNE, 4, 2 },
    { IR_SGE, "IR_SGE", OPCODE_SGE, 4, 2 },
@@ -84,7 +85,7 @@ static slang_ir_info IrInfo[] = {
    { IR_FLOOR, "IR_FLOOR", OPCODE_FLR, 4, 1 },
    { IR_FRAC, "IR_FRAC", OPCODE_FRC, 4, 1 },
    { IR_ABS, "IR_ABS", OPCODE_ABS, 4, 1 },
-   { IR_NEG, "IR_NEG", OPCODE_NOP/*spec case*/, 4, 1 },
+   { IR_NEG, "IR_NEG", OPCODE_NOP, 4, 1 }, /* special case: emit_negation() */
    { IR_DDX, "IR_DDX", OPCODE_DDX, 4, 1 },
    { IR_DDX, "IR_DDY", OPCODE_DDX, 4, 1 },
    { IR_SIN, "IR_SIN", OPCODE_SIN, 1, 1 },
@@ -298,12 +299,14 @@ slang_print_ir(const slang_ir_node *n, int indent)
 
    case IR_VAR:
       printf("VAR %s%s at %s  store %p\n",
-             (char *) n->Var->a_name, swizzle_string(n->Store->Swizzle),
+             (n->Var ? (char *) n->Var->a_name : "TEMP"),
+             swizzle_string(n->Store->Swizzle),
              storage_string(n->Store), (void*) n->Store);
       break;
    case IR_VAR_DECL:
       printf("VAR_DECL %s (%p) at %s  store %p\n",
-             (char *) n->Var->a_name, (void*) n->Var, storage_string(n->Store),
+             (n->Var ? (char *) n->Var->a_name : "TEMP"),
+             (void*) n->Var, storage_string(n->Store),
              (void*) n->Store);
       break;
    case IR_FIELD:
@@ -447,6 +450,19 @@ new_instruction(struct gl_program *prog, gl_inst_opcode opcode)
 }
 
 
+/**
+ * Return pointer to last instruction in program.
+ */
+static struct prog_instruction *
+prev_instruction(struct gl_program *prog)
+{
+   if (prog->NumInstructions == 0)
+      return NULL;
+   else
+      return prog->Instructions + prog->NumInstructions - 1;
+}
+
+
 static struct prog_instruction *
 emit(slang_var_table *vt, slang_ir_node *n, struct gl_program *prog);
 
@@ -674,6 +690,73 @@ emit_arith(slang_var_table *vt, slang_ir_node *n, struct gl_program *prog)
 }
 
 
+/**
+ * Generate code for an IR_CLAMP instruction.
+ */
+static struct prog_instruction *
+emit_clamp(slang_var_table *vt, slang_ir_node *n, struct gl_program *prog)
+{
+   struct prog_instruction *inst;
+
+   assert(n->Opcode == IR_CLAMP);
+   /* ch[0] = value
+    * ch[1] = min limit
+    * ch[2] = max limit
+    */
+
+   inst = emit(vt, n->Children[0], prog);
+
+   /* If lower limit == 0.0 and upper limit == 1.0,
+    *    set prev instruction's SaturateMode field to SATURATE_ZERO_ONE.
+    * Else,
+    *    emit OPCODE_MIN, OPCODE_MAX sequence.
+    */
+#if 0
+   /* XXX this isn't quite finished yet */
+   if (n->Children[1]->Opcode == IR_FLOAT &&
+       n->Children[1]->Value[0] == 0.0 &&
+       n->Children[1]->Value[1] == 0.0 &&
+       n->Children[1]->Value[2] == 0.0 &&
+       n->Children[1]->Value[3] == 0.0 &&
+       n->Children[2]->Opcode == IR_FLOAT &&
+       n->Children[2]->Value[0] == 1.0 &&
+       n->Children[2]->Value[1] == 1.0 &&
+       n->Children[2]->Value[2] == 1.0 &&
+       n->Children[2]->Value[3] == 1.0) {
+      if (!inst) {
+         inst = prev_instruction(prog);
+      }
+      if (inst && inst->Opcode != OPCODE_NOP) {
+         /* and prev instruction's DstReg matches n->Children[0]->Store */
+         inst->SaturateMode = SATURATE_ZERO_ONE;
+         n->Store = n->Children[0]->Store;
+         return inst;
+      }
+   }
+#endif
+
+   if (!n->Store)
+      if (!alloc_temp_storage(vt, n, n->Children[0]->Store->Size))
+         return NULL;
+
+   emit(vt, n->Children[1], prog);
+   emit(vt, n->Children[2], prog);
+
+   /* tmp = max(ch[0], ch[1]) */
+   inst = new_instruction(prog, OPCODE_MAX);
+   storage_to_dst_reg(&inst->DstReg, n->Store, n->Writemask);
+   storage_to_src_reg(&inst->SrcReg[0], n->Children[0]->Store);
+   storage_to_src_reg(&inst->SrcReg[1], n->Children[1]->Store);
+
+   /* tmp = min(tmp, ch[2]) */
+   inst = new_instruction(prog, OPCODE_MIN);
+   storage_to_dst_reg(&inst->DstReg, n->Store, n->Writemask);
+   storage_to_src_reg(&inst->SrcReg[0], n->Store);
+   storage_to_src_reg(&inst->SrcReg[1], n->Children[2]->Store);
+
+   return inst;
+}
+
 
 static struct prog_instruction *
 emit_negation(slang_var_table *vt, slang_ir_node *n, struct gl_program *prog)
@@ -800,6 +883,9 @@ emit_move(slang_var_table *vt, slang_ir_node *n, struct gl_program *prog)
    /* lhs */
    emit(vt, n->Children[0], prog);
 
+   assert(!n->Store);
+   n->Store = n->Children[0]->Store;
+
 #if PEEPHOLE_OPTIMIZATIONS
    if (inst && _slang_is_temp(vt, n->Children[1]->Store)) {
       /* Peephole optimization:
@@ -850,8 +936,6 @@ emit_move(slang_var_table *vt, slang_ir_node *n, struct gl_program *prog)
                                                 srcAnnot, NULL, NULL);
       }
       free_temp_storage(vt, n->Children[1]);
-      assert(!n->Store);
-      n->Store = n->Children[0]->Store; /*XXX new */
       return inst;
    }
 }
@@ -1022,6 +1106,8 @@ emit(slang_var_table *vt, slang_ir_node *n, struct gl_program *prog)
    /* trinary operators */
    case IR_LRP:
       return emit_arith(vt, n, prog);
+   case IR_CLAMP:
+      return emit_clamp(vt, n, prog);
    case IR_TEX:
    case IR_TEXB:
    case IR_TEXP:
diff --git a/src/mesa/shader/slang/slang_ir.h b/src/mesa/shader/slang/slang_ir.h
index 39b4ab65b5..4b696c5c13 100644
--- a/src/mesa/shader/slang/slang_ir.h
+++ b/src/mesa/shader/slang/slang_ir.h
@@ -64,6 +64,7 @@ typedef enum
    IR_DOT3,
    IR_CROSS,   /* vec3 cross product */
    IR_LRP,
+   IR_CLAMP,
    IR_MIN,
    IR_MAX,
    IR_SEQUAL,  /* Set if args are equal */