Merge branch 'mesa_7_6_branch'

14 files changed, 197 insertions, 102 deletions

diff --git a/docs/relnotes-7.6.1.html b/docs/relnotes-7.6.1.html
index 584a2de926..3271f47989 100644
--- a/docs/relnotes-7.6.1.html
+++ b/docs/relnotes-7.6.1.html
@@ -38,6 +38,8 @@ tbd
 <h2>Bug fixes</h2>
 <ul>
 <li>Fixed crash caused by glXCopyContext() and glXDestroyContext(), bug 24217
+<li>glXQueryContext(GLX_RENDER_TYPE) returned wrong values (bug 24211)
+<li>GLSL sqrt(0) returned unpredictable results
 </ul>
 
 </body>
diff --git a/src/gallium/state_trackers/glx/xlib/glx_api.c b/src/gallium/state_trackers/glx/xlib/glx_api.c
index d1a98f8991..65012e9253 100644
--- a/src/gallium/state_trackers/glx/xlib/glx_api.c
+++ b/src/gallium/state_trackers/glx/xlib/glx_api.c
@@ -1538,9 +1538,9 @@ get_config( XMesaVisual xmvis, int attrib, int *value, GLboolean fbconfig )
          if (!fbconfig)
             return GLX_BAD_ATTRIBUTE;
          if (xmvis->mesa_visual.rgbMode)
-            *value = GLX_RGBA_BIT;
+            *value = GLX_RGBA_TYPE;
          else
-            *value = GLX_COLOR_INDEX_BIT;
+            *value = GLX_COLOR_INDEX_TYPE;
          break;
       case GLX_X_RENDERABLE_SGIX:
          if (!fbconfig)
@@ -2120,9 +2120,9 @@ glXQueryContext( Display *dpy, GLXContext ctx, int attribute, int *value )
       break;
    case GLX_RENDER_TYPE:
       if (xmctx->xm_visual->mesa_visual.rgbMode)
-         *value = GLX_RGBA_BIT;
+         *value = GLX_RGBA_TYPE;
       else
-         *value = GLX_COLOR_INDEX_BIT;
+         *value = GLX_COLOR_INDEX_TYPE;
       break;
    case GLX_SCREEN:
       *value = 0;
diff --git a/src/glx/x11/glxcmds.c b/src/glx/x11/glxcmds.c
index ea55cc49ef..cd4aede74e 100644
--- a/src/glx/x11/glxcmds.c
+++ b/src/glx/x11/glxcmds.c
@@ -398,6 +398,10 @@ CreateContext(Display * dpy, XVisualInfo * vis,
                _XError(dpy, &error);
                return None;
             }
+            if (renderType == 0) {
+               /* Initialize renderType now */
+               renderType = mode->rgbMode ? GLX_RGBA_TYPE : GLX_COLOR_INDEX_TYPE;
+            }
          }
          else {
             mode = fbconfig;
@@ -484,6 +488,8 @@ CreateContext(Display * dpy, XVisualInfo * vis,
       gc->imported = GL_TRUE;
    }
 
+   gc->renderType = renderType;
+
    return gc;
 }
 
@@ -1575,7 +1581,7 @@ GLX_ALIAS(Display *, glXGetCurrentDisplayEXT, (void), (),
  * This function dynamically determines whether to use the EXT_import_context
  * version of the protocol or the GLX 1.3 version of the protocol.
  */
-     static int __glXQueryContextInfo(Display * dpy, GLXContext ctx)
+static int __glXQueryContextInfo(Display * dpy, GLXContext ctx)
 {
    __GLXdisplayPrivate *priv = __glXInitialize(dpy);
    xGLXQueryContextReply reply;
@@ -1713,7 +1719,7 @@ GLX_ALIAS(int, glXQueryContextInfoEXT,
           (Display * dpy, GLXContext ctx, int attribute, int *value),
           (dpy, ctx, attribute, value), glXQueryContext)
 
-     PUBLIC GLXContextID glXGetContextIDEXT(const GLXContext ctx)
+PUBLIC GLXContextID glXGetContextIDEXT(const GLXContext ctx)
 {
    return ctx->xid;
 }
@@ -2159,18 +2165,19 @@ GLX_ALIAS(int, glXGetFBConfigAttribSGIX,
           (Display * dpy, GLXFBConfigSGIX config, int attribute, int *value),
           (dpy, config, attribute, value), glXGetFBConfigAttrib)
 
-     PUBLIC GLX_ALIAS(GLXFBConfigSGIX *, glXChooseFBConfigSGIX,
-                      (Display * dpy, int screen, int *attrib_list,
-                       int *nelements), (dpy, screen, attrib_list, nelements),
-                      glXChooseFBConfig)
+PUBLIC GLX_ALIAS(GLXFBConfigSGIX *, glXChooseFBConfigSGIX,
+                 (Display * dpy, int screen, int *attrib_list,
+                  int *nelements), (dpy, screen, attrib_list, nelements),
+                 glXChooseFBConfig)
 
-     PUBLIC GLX_ALIAS(XVisualInfo *, glXGetVisualFromFBConfigSGIX,
-                      (Display * dpy, GLXFBConfigSGIX config),
-                      (dpy, config), glXGetVisualFromFBConfig)
+PUBLIC GLX_ALIAS(XVisualInfo *, glXGetVisualFromFBConfigSGIX,
+                 (Display * dpy, GLXFBConfigSGIX config),
+                 (dpy, config), glXGetVisualFromFBConfig)
 
-     PUBLIC GLXPixmap glXCreateGLXPixmapWithConfigSGIX(Display * dpy,
-                                                       GLXFBConfigSGIX config,
-                                                       Pixmap pixmap)
+PUBLIC GLXPixmap
+glXCreateGLXPixmapWithConfigSGIX(Display * dpy,
+                                 GLXFBConfigSGIX config,
+                                 Pixmap pixmap)
 {
    xGLXVendorPrivateWithReplyReq *vpreq;
    xGLXCreateGLXPixmapWithConfigSGIXReq *req;
diff --git a/src/mesa/drivers/dri/i965/brw_state.h b/src/mesa/drivers/dri/i965/brw_state.h
index 5335eac895..d639656b9d 100644
--- a/src/mesa/drivers/dri/i965/brw_state.h
+++ b/src/mesa/drivers/dri/i965/brw_state.h
@@ -151,6 +151,7 @@ void brw_state_cache_check_size( struct brw_context *brw );
 
 void brw_init_caches( struct brw_context *brw );
 void brw_destroy_caches( struct brw_context *brw );
+void brw_state_cache_bo_delete(struct brw_cache *cache, dri_bo *bo);
 
 /***********************************************************************
  * brw_state_batch.c
diff --git a/src/mesa/drivers/dri/i965/brw_state_cache.c b/src/mesa/drivers/dri/i965/brw_state_cache.c
index e40d7a0416..f8e46aacf7 100644
--- a/src/mesa/drivers/dri/i965/brw_state_cache.c
+++ b/src/mesa/drivers/dri/i965/brw_state_cache.c
@@ -517,6 +517,55 @@ brw_clear_cache(struct brw_context *brw, struct brw_cache *cache)
    brw->state.dirty.cache |= ~0;
 }
 
+/* Clear all entries from the cache that point to the given bo.
+ *
+ * This lets us release memory for reuse earlier for known-dead buffers,
+ * at the cost of walking the entire hash table.
+ */
+void
+brw_state_cache_bo_delete(struct brw_cache *cache, dri_bo *bo)
+{
+   struct brw_cache_item **prev;
+   GLuint i;
+
+   if (INTEL_DEBUG & DEBUG_STATE)
+      _mesa_printf("%s\n", __FUNCTION__);
+
+   for (i = 0; i < cache->size; i++) {
+      for (prev = &cache->items[i]; *prev;) {
+	 struct brw_cache_item *c = *prev;
+	 int j;
+
+	 for (j = 0; j < c->nr_reloc_bufs; j++) {
+	    if (c->reloc_bufs[j] == bo)
+	       break;
+	 }
+
+	 if (j != c->nr_reloc_bufs) {
+
+	    *prev = c->next;
+
+	    for (j = 0; j < c->nr_reloc_bufs; j++)
+	       dri_bo_unreference(c->reloc_bufs[j]);
+	    dri_bo_unreference(c->bo);
+	    free((void *)c->key);
+	    free(c);
+	    cache->n_items--;
+
+	    /* Delete up the tree.  Notably we're trying to get from
+	     * a request to delete the surface, to deleting the surface state
+	     * object, to deleting the binding table.  We're slack and restart
+	     * the deletion process when we do this because the other delete
+	     * may kill our *prev.
+	     */
+	    brw_state_cache_bo_delete(cache, c->bo);
+	    prev = &cache->items[i];
+	 } else {
+	    prev = &(*prev)->next;
+	 }
+      }
+   }
+}
 
 void
 brw_state_cache_check_size(struct brw_context *brw)
diff --git a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
index c985da5aa2..4f5101a312 100644
--- a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
@@ -29,6 +29,9 @@
 #include "intel_mipmap_tree.h"
 #include "intel_regions.h"
 #include "intel_chipset.h"
+#ifndef I915
+#include "brw_state.h"
+#endif
 #include "main/enums.h"
 
 #define FILE_DEBUG_FLAG DEBUG_MIPTREE
@@ -269,6 +272,19 @@ intel_miptree_release(struct intel_context *intel,
 
       DBG("%s deleting %p\n", __FUNCTION__, *mt);
 
+#ifndef I915
+      /* Free up cached binding tables holding a reference on our buffer, to
+       * avoid excessive memory consumption.
+       *
+       * This isn't as aggressive as we could be, as we'd like to do
+       * it from any time we free the last ref on a region.  But intel_region.c
+       * is context-agnostic.  Perhaps our constant state cache should be, as
+       * well.
+       */
+      brw_state_cache_bo_delete(&brw_context(&intel->ctx)->surface_cache,
+				(*mt)->region->buffer);
+#endif
+
       intel_region_release(&((*mt)->region));
 
       for (i = 0; i < MAX_TEXTURE_LEVELS; i++)
diff --git a/src/mesa/drivers/x11/fakeglx.c b/src/mesa/drivers/x11/fakeglx.c
index 34e0b8bc8d..eb7c4f6417 100644
--- a/src/mesa/drivers/x11/fakeglx.c
+++ b/src/mesa/drivers/x11/fakeglx.c
@@ -2477,9 +2477,9 @@ Fake_glXQueryContext( Display *dpy, GLXContext ctx, int attribute, int *value )
       break;
    case GLX_RENDER_TYPE:
       if (xmctx->xm_visual->mesa_visual.rgbMode)
-         *value = GLX_RGBA_BIT;
+         *value = GLX_RGBA_TYPE;
       else
-         *value = GLX_COLOR_INDEX_BIT;
+         *value = GLX_COLOR_INDEX_TYPE;
       break;
    case GLX_SCREEN:
       *value = 0;
diff --git a/src/mesa/shader/prog_execute.c b/src/mesa/shader/prog_execute.c
index 69b81e724a..192d39aed1 100644
--- a/src/mesa/shader/prog_execute.c
+++ b/src/mesa/shader/prog_execute.c
@@ -939,7 +939,7 @@ _mesa_execute_program(GLcontext * ctx,
 	    /* The fast LOG2 macro doesn't meet the precision requirements.
 	     */
             if (a[0] == 0.0F) {
-               val = 0.0F;
+               val = -FLT_MAX;
             }
             else {
                val = log(a[0]) * 1.442695F;
diff --git a/src/mesa/shader/slang/library/slang_common_builtin.gc b/src/mesa/shader/slang/library/slang_common_builtin.gc
index 9764fc25b0..56de47ee8d 100644
--- a/src/mesa/shader/slang/library/slang_common_builtin.gc
+++ b/src/mesa/shader/slang/library/slang_common_builtin.gc
@@ -602,42 +602,50 @@ vec4 exp2(const vec4 a)
 
 float sqrt(const float x)
 {
+   const float nx = -x;
    float r;
    __asm float_rsq r, x;
-   __asm float_rcp __retVal, r;
-}
-
-vec2 sqrt(const vec2 v)
-{
-   float r;
-   __asm float_rsq r, v.x;
-   __asm float_rcp __retVal.x, r;
-   __asm float_rsq r, v.y;
-   __asm float_rcp __retVal.y, r;
-}
-
-vec3 sqrt(const vec3 v)
-{
-   float r;
-   __asm float_rsq r, v.x;
-   __asm float_rcp __retVal.x, r;
-   __asm float_rsq r, v.y;
-   __asm float_rcp __retVal.y, r;
-   __asm float_rsq r, v.z;
-   __asm float_rcp __retVal.z, r;
-}
-
-vec4 sqrt(const vec4 v)
-{
-   float r;
-   __asm float_rsq r, v.x;
-   __asm float_rcp __retVal.x, r;
-   __asm float_rsq r, v.y;
-   __asm float_rcp __retVal.y, r;
-   __asm float_rsq r, v.z;
-   __asm float_rcp __retVal.z, r;
-   __asm float_rsq r, v.w;
-   __asm float_rcp __retVal.w, r;
+   __asm float_rcp r, r;
+   __asm vec4_cmp __retVal, nx, r, 0.0;
+}
+
+vec2 sqrt(const vec2 x)
+{
+   const vec2 nx = -x, zero = vec2(0.0);
+   vec2 r;
+   __asm float_rsq r.x, x.x;
+   __asm float_rsq r.y, x.y;
+   __asm float_rcp r.x, r.x;
+   __asm float_rcp r.y, r.y;
+   __asm vec4_cmp __retVal, nx, r, zero;
+}
+
+vec3 sqrt(const vec3 x)
+{
+   const vec3 nx = -x, zero = vec3(0.0);
+   vec3 r;
+   __asm float_rsq r.x, x.x;
+   __asm float_rsq r.y, x.y;
+   __asm float_rsq r.z, x.z;
+   __asm float_rcp r.x, r.x;
+   __asm float_rcp r.y, r.y;
+   __asm float_rcp r.z, r.z;
+   __asm vec4_cmp __retVal, nx, r, zero;
+}
+
+vec4 sqrt(const vec4 x)
+{
+   const vec4 nx = -x, zero = vec4(0.0);
+   vec4 r;
+   __asm float_rsq r.x, x.x;
+   __asm float_rsq r.y, x.y;
+   __asm float_rsq r.z, x.z;
+   __asm float_rsq r.w, x.w;
+   __asm float_rcp r.x, r.x;
+   __asm float_rcp r.y, r.y;
+   __asm float_rcp r.z, r.z;
+   __asm float_rcp r.w, r.w;
+   __asm vec4_cmp __retVal, nx, r, zero;
 }
 
 
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 78a7b83ec1..3c3666e4ea 100644
--- a/src/mesa/shader/slang/library/slang_common_builtin_gc.h
+++ b/src/mesa/shader/slang/library/slang_common_builtin_gc.h
@@ -307,55 +307,63 @@
 0,0,18,97,0,59,121,0,0,0,4,102,108,111,97,116,95,101,120,112,50,0,18,95,95,114,101,116,86,97,108,0,
 59,122,0,0,18,97,0,59,122,0,0,0,4,102,108,111,97,116,95,101,120,112,50,0,18,95,95,114,101,116,86,
 97,108,0,59,119,0,0,18,97,0,59,119,0,0,0,0,1,90,95,0,0,9,0,0,115,113,114,116,0,1,1,0,0,9,0,120,0,0,
-0,1,3,2,90,95,0,0,9,0,1,114,0,0,0,4,102,108,111,97,116,95,114,115,113,0,18,114,0,0,18,120,0,0,0,4,
-102,108,111,97,116,95,114,99,112,0,18,95,95,114,101,116,86,97,108,0,0,18,114,0,0,0,0,1,90,95,0,0,
-10,0,0,115,113,114,116,0,1,1,0,0,10,0,118,0,0,0,1,3,2,90,95,0,0,9,0,1,114,0,0,0,4,102,108,111,97,
-116,95,114,115,113,0,18,114,0,0,18,118,0,59,120,0,0,0,4,102,108,111,97,116,95,114,99,112,0,18,95,
-95,114,101,116,86,97,108,0,59,120,0,0,18,114,0,0,0,4,102,108,111,97,116,95,114,115,113,0,18,114,0,
-0,18,118,0,59,121,0,0,0,4,102,108,111,97,116,95,114,99,112,0,18,95,95,114,101,116,86,97,108,0,59,
-121,0,0,18,114,0,0,0,0,1,90,95,0,0,11,0,0,115,113,114,116,0,1,1,0,0,11,0,118,0,0,0,1,3,2,90,95,0,0,
-9,0,1,114,0,0,0,4,102,108,111,97,116,95,114,115,113,0,18,114,0,0,18,118,0,59,120,0,0,0,4,102,108,
-111,97,116,95,114,99,112,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,114,0,0,0,4,102,108,111,
-97,116,95,114,115,113,0,18,114,0,0,18,118,0,59,121,0,0,0,4,102,108,111,97,116,95,114,99,112,0,18,
-95,95,114,101,116,86,97,108,0,59,121,0,0,18,114,0,0,0,4,102,108,111,97,116,95,114,115,113,0,18,114,
-0,0,18,118,0,59,122,0,0,0,4,102,108,111,97,116,95,114,99,112,0,18,95,95,114,101,116,86,97,108,0,59,
-122,0,0,18,114,0,0,0,0,1,90,95,0,0,12,0,0,115,113,114,116,0,1,1,0,0,12,0,118,0,0,0,1,3,2,90,95,0,0,
-9,0,1,114,0,0,0,4,102,108,111,97,116,95,114,115,113,0,18,114,0,0,18,118,0,59,120,0,0,0,4,102,108,
-111,97,116,95,114,99,112,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,114,0,0,0,4,102,108,111,
-97,116,95,114,115,113,0,18,114,0,0,18,118,0,59,121,0,0,0,4,102,108,111,97,116,95,114,99,112,0,18,
-95,95,114,101,116,86,97,108,0,59,121,0,0,18,114,0,0,0,4,102,108,111,97,116,95,114,115,113,0,18,114,
-0,0,18,118,0,59,122,0,0,0,4,102,108,111,97,116,95,114,99,112,0,18,95,95,114,101,116,86,97,108,0,59,
-122,0,0,18,114,0,0,0,4,102,108,111,97,116,95,114,115,113,0,18,114,0,0,18,118,0,59,119,0,0,0,4,102,
-108,111,97,116,95,114,99,112,0,18,95,95,114,101,116,86,97,108,0,59,119,0,0,18,114,0,0,0,0,1,90,95,
-0,0,9,0,0,105,110,118,101,114,115,101,115,113,114,116,0,1,1,0,0,9,0,120,0,0,0,1,4,102,108,111,97,
-116,95,114,115,113,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,120,0,0,0,0,1,90,95,0,0,10,0,0,
-105,110,118,101,114,115,101,115,113,114,116,0,1,1,0,0,10,0,118,0,0,0,1,4,102,108,111,97,116,95,114,
-115,113,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,118,0,59,120,0,0,0,4,102,108,111,97,116,
-95,114,115,113,0,18,95,95,114,101,116,86,97,108,0,59,121,0,0,18,118,0,59,121,0,0,0,0,1,90,95,0,0,
-11,0,0,105,110,118,101,114,115,101,115,113,114,116,0,1,1,0,0,11,0,118,0,0,0,1,4,102,108,111,97,116,
-95,114,115,113,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,118,0,59,120,0,0,0,4,102,108,111,
-97,116,95,114,115,113,0,18,95,95,114,101,116,86,97,108,0,59,121,0,0,18,118,0,59,121,0,0,0,4,102,
-108,111,97,116,95,114,115,113,0,18,95,95,114,101,116,86,97,108,0,59,122,0,0,18,118,0,59,122,0,0,0,
-0,1,90,95,0,0,12,0,0,105,110,118,101,114,115,101,115,113,114,116,0,1,1,0,0,12,0,118,0,0,0,1,4,102,
-108,111,97,116,95,114,115,113,0,18,95,95,114,101,116,86,97,108,0,59,120,0,0,18,118,0,59,120,0,0,0,
-4,102,108,111,97,116,95,114,115,113,0,18,95,95,114,101,116,86,97,108,0,59,121,0,0,18,118,0,59,121,
-0,0,0,4,102,108,111,97,116,95,114,115,113,0,18,95,95,114,101,116,86,97,108,0,59,122,0,0,18,118,0,
-59,122,0,0,0,4,102,108,111,97,116,95,114,115,113,0,18,95,95,114,101,116,86,97,108,0,59,119,0,0,18,
-118,0,59,119,0,0,0,0,1,90,95,0,0,9,0,0,110,111,114,109,97,108,105,122,101,0,1,1,0,0,9,0,120,0,0,0,
-1,9,18,95,95,114,101,116,86,97,108,0,17,49,0,48,0,0,20,0,0,1,90,95,0,0,10,0,0,110,111,114,109,97,
-108,105,122,101,0,1,1,0,0,10,0,118,0,0,0,1,3,2,90,95,1,0,9,0,1,115,0,2,58,105,110,118,101,114,115,
-101,115,113,114,116,0,0,58,100,111,116,0,0,18,118,0,0,18,118,0,0,0,0,0,0,0,4,118,101,99,52,95,109,
-117,108,116,105,112,108,121,0,18,95,95,114,101,116,86,97,108,0,59,120,121,0,0,18,118,0,0,18,115,0,
-0,0,0,1,90,95,0,0,11,0,0,110,111,114,109,97,108,105,122,101,0,1,1,0,0,11,0,118,0,0,0,1,3,2,90,95,0,
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-0,0,4,102,108,111,97,116,95,114,115,113,0,18,116,109,112,0,0,18,116,109,112,0,0,0,4,118,101,99,52,
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+4,102,108,111,97,116,95,114,115,113,0,18,116,109,112,0,0,18,116,109,112,0,0,0,4,118,101,99,52,95,
+109,117,108,116,105,112,108,121,0,18,95,95,114,101,116,86,97,108,0,59,120,121,122,0,0,18,118,0,0,
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+4,118,101,99,52,95,109,117,108,116,105,112,108,121,0,18,95,95,114,101,116,86,97,108,0,59,120,121,
+122,0,0,18,118,0,0,18,116,109,112,0,0,0,0,1,90,95,0,0,9,0,0,97,98,115,0,1,1,0,0,9,0,97,0,0,0,1,4,
+118,101,99,52,95,97,98,115,0,18,95,95,114,101,116,86,97,108,0,0,18,97,0,0,0,0,1,90,95,0,0,10,0,0,
 97,98,115,0,1,1,0,0,10,0,97,0,0,0,1,4,118,101,99,52,95,97,98,115,0,18,95,95,114,101,116,86,97,108,
 0,59,120,121,0,0,18,97,0,0,0,0,1,90,95,0,0,11,0,0,97,98,115,0,1,1,0,0,11,0,97,0,0,0,1,4,118,101,99,
 52,95,97,98,115,0,18,95,95,114,101,116,86,97,108,0,59,120,121,122,0,0,18,97,0,0,0,0,1,90,95,0,0,12,
diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c
index 703af9f874..344dfdc680 100644
--- a/src/mesa/shader/slang/slang_codegen.c
+++ b/src/mesa/shader/slang/slang_codegen.c
@@ -422,6 +422,7 @@ static slang_asm_info AsmInfo[] = {
    { "vec4_lrp", IR_LRP, 1, 3 },
    { "vec4_min", IR_MIN, 1, 2 },
    { "vec4_max", IR_MAX, 1, 2 },
+   { "vec4_cmp", IR_CMP, 1, 3 },
    { "vec4_clamp", IR_CLAMP, 1, 3 },
    { "vec4_seq", IR_SEQUAL, 1, 2 },
    { "vec4_sne", IR_SNEQUAL, 1, 2 },
diff --git a/src/mesa/shader/slang/slang_emit.c b/src/mesa/shader/slang/slang_emit.c
index 3f455e0640..3af301eacd 100644
--- a/src/mesa/shader/slang/slang_emit.c
+++ b/src/mesa/shader/slang/slang_emit.c
@@ -2287,6 +2287,7 @@ emit(slang_emit_info *emitInfo, slang_ir_node *n)
    case IR_POW:
    /* trinary operators */
    case IR_LRP:
+   case IR_CMP:
       return emit_arith(emitInfo, n);
 
    case IR_EQUAL:
diff --git a/src/mesa/shader/slang/slang_ir.c b/src/mesa/shader/slang/slang_ir.c
index 1c7f7474e7..62603503dd 100644
--- a/src/mesa/shader/slang/slang_ir.c
+++ b/src/mesa/shader/slang/slang_ir.c
@@ -80,6 +80,7 @@ static const slang_ir_info IrInfo[] = {
    { IR_NOISE4, "IR_NOISE4", OPCODE_NOISE4, 1, 1 },
 
    /* other */
+   { IR_CMP, "IR_CMP", OPCODE_CMP, 4, 3 },  /* compare/select */
    { IR_SEQ, "IR_SEQ", OPCODE_NOP, 0, 0 },
    { IR_SCOPE, "IR_SCOPE", OPCODE_NOP, 0, 0 },
    { IR_LABEL, "IR_LABEL", OPCODE_NOP, 0, 0 },
diff --git a/src/mesa/shader/slang/slang_ir.h b/src/mesa/shader/slang/slang_ir.h
index e796693ed5..166b4e8043 100644
--- a/src/mesa/shader/slang/slang_ir.h
+++ b/src/mesa/shader/slang/slang_ir.h
@@ -91,6 +91,7 @@ typedef enum
    IR_CLAMP,
    IR_MIN,
    IR_MAX,
+   IR_CMP,     /* = (op0 < 0) ? op1 : op2 */
    IR_SEQUAL,  /* Set if args are equal (vector) */
    IR_SNEQUAL, /* Set if args are not equal (vector) */
    IR_SGE,     /* Set if greater or equal (vector) */